src/main/java/de/thm/arsnova/exceptions/NotFoundException.java

-package de.thm.arsnova.exceptions;
-
-public class NotFoundException extends RuntimeException {
-	private static final long serialVersionUID = 1L;
-}

src/main/java/de/thm/arsnova/exceptions/NotImplementedException.java

-package de.thm.arsnova.exceptions;
-
-public class NotImplementedException extends RuntimeException {
-	private static final long serialVersionUID = 1L;
-}

src/main/java/de/thm/arsnova/exceptions/PreconditionFailedException.java

-package de.thm.arsnova.exceptions;
-
-public class PreconditionFailedException extends RuntimeException {
-	private static final long serialVersionUID = 1L;
-}

src/main/java/de/thm/arsnova/exceptions/UnauthorizedException.java

-package de.thm.arsnova.exceptions;
-
-public class UnauthorizedException extends RuntimeException {
-	private static final long serialVersionUID = 1L;
-}

src/main/java/de/thm/arsnova/exceptions/package-info.java

-package de.thm.arsnova.exceptions;

src/main/java/de/thm/arsnova/management/StatisticsEndpoint.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.management;
+
+import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
+import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
+import org.springframework.stereotype.Component;
+
+import de.thm.arsnova.model.Statistics;
+import de.thm.arsnova.service.StatisticsService;
+
+@Component
+@Endpoint(id = "stats")
+public class StatisticsEndpoint {
+	private StatisticsService statisticsService;
+
+	public StatisticsEndpoint(final StatisticsService statisticsService) {
+		this.statisticsService = statisticsService;
+	}
+
+	@ReadOperation
+	public Statistics readStatistics() {
+		return statisticsService.getStatistics();
+	}
+}

src/main/java/de/thm/arsnova/management/VersionInfoContributor.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.management;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+import javax.annotation.Resource;
+import org.springframework.boot.actuate.info.Info;
+import org.springframework.boot.actuate.info.InfoContributor;
+import org.springframework.stereotype.Component;
+
+@Component
+public class VersionInfoContributor implements InfoContributor {
+	private Map<String, Object> infoDetails;
+
+	@Override
+	public void contribute(final Info.Builder builder) {
+		builder.withDetails(infoDetails);
+	}
+
+	@Resource(name = "versionInfoProperties")
+	public void setVersionInfoProperties(final Properties versionInfoProperties) {
+		infoDetails = new HashMap<>();
+		final Map<String, Object> version = new HashMap<>();
+
+		version.put("string", versionInfoProperties.getProperty("version.string"));
+		version.put("buildTime", versionInfoProperties.getProperty("version.build-time"));
+		version.put("gitCommitId", versionInfoProperties.getProperty("version.git.commit-id"));
+		version.put("gitDirty", Boolean.parseBoolean(versionInfoProperties.getProperty("version.git.dirty")));
+
+		infoDetails.put("productName", "arsnova-backend");
+		infoDetails.put("version", version);
+	}
+
+	public Map<String, Object> getInfoDetails() {
+		return infoDetails;
+	}
+}

src/main/java/de/thm/arsnova/model/Answer.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.annotation.JsonView;
+import com.fasterxml.jackson.databind.annotation.JsonTypeIdResolver;
+import java.util.Map;
+import java.util.Objects;
+import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Positive;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.FormatAnswerTypeIdResolver;
+import de.thm.arsnova.model.serialization.View;
+
+@JsonTypeInfo(
+		use = JsonTypeInfo.Id.CUSTOM,
+		property = "format",
+		visible = true,
+		defaultImpl = Answer.class
+)
+@JsonTypeIdResolver(FormatAnswerTypeIdResolver.class)
+public class Answer extends Entity {
+	@NotEmpty
+	private String contentId;
+
+	@NotEmpty
+	private String roomId;
+
+	@NotEmpty
+	private String creatorId;
+
+	@NotNull
+	private Content.Format format;
+
+	@Positive
+	private int round = 1;
+
+	private Map<String, Map<String, Object>> extensions;
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getContentId() {
+		return contentId;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setContentId(final String contentId) {
+		this.contentId = contentId;
+	}
+
+	@JsonView(View.Persistence.class)
+	public String getRoomId() {
+		return roomId;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setRoomId(final String roomId) {
+		this.roomId = roomId;
+	}
+
+	@JsonView(View.Persistence.class)
+	public String getCreatorId() {
+		return creatorId;
+	}
+
+	public void setCreatorId(final String creatorId) {
+		this.creatorId = creatorId;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public Content.Format getFormat() {
+		return format;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setFormat(final Content.Format format) {
+		this.format = format;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public int getRound() {
+		return round;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setRound(final int round) {
+		this.round = round;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public Map<String, Map<String, Object>> getExtensions() {
+		return extensions;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setExtensions(final Map<String, Map<String, Object>> extensions) {
+		this.extensions = extensions;
+	}
+
+	@JsonView(View.Persistence.class)
+	@Override
+	public Class<? extends Entity> getType() {
+		return Answer.class;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>
+	 * The following fields of <tt>Answer</tt> are excluded from equality checks:
+	 * {@link #extensions}.
+	 * </p>
+	 */
+	@Override
+	public boolean equals(final Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (!super.equals(o)) {
+			return false;
+		}
+		final Answer answer = (Answer) o;
+
+		return round == answer.round
+				&& Objects.equals(contentId, answer.contentId)
+				&& Objects.equals(roomId, answer.roomId)
+				&& Objects.equals(creatorId, answer.creatorId);
+	}
+
+	@Override
+	protected ToStringCreator buildToString() {
+		return super.buildToString()
+				.append("contentId", contentId)
+				.append("roomId", roomId)
+				.append("creatorId", creatorId)
+				.append("format", format)
+				.append("round", round);
+	}
+}

src/main/java/de/thm/arsnova/model/AnswerStatistics.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.View;
+
+public class AnswerStatistics {
+	public static class RoundStatistics {
+		public static class Combination {
+			private List<Integer> selectedChoiceIndexes;
+			private int count;
+
+			public Combination(final List<Integer> selectedChoiceIndexes, final int count) {
+				this.selectedChoiceIndexes = selectedChoiceIndexes;
+				this.count = count;
+			}
+
+			@JsonView(View.Public.class)
+			public List<Integer> getSelectedChoiceIndexes() {
+				return selectedChoiceIndexes;
+			}
+
+			@JsonView(View.Public.class)
+			public int getCount() {
+				return count;
+			}
+
+			@Override
+			public String toString() {
+				return new ToStringCreator(this)
+						.append("selectedChoiceIndexes", selectedChoiceIndexes)
+						.append("count", count)
+						.toString();
+			}
+		}
+
+		private int round;
+		private List<Integer> independentCounts;
+		private Collection<Combination> combinatedCounts;
+		private int abstentionCount;
+
+		@JsonView(View.Public.class)
+		public int getRound() {
+			return round;
+		}
+
+		public void setRound(final int round) {
+			this.round = round;
+		}
+
+		@JsonView(View.Public.class)
+		public List<Integer> getIndependentCounts() {
+			if (independentCounts == null) {
+				independentCounts = new ArrayList<>();
+			}
+
+			return independentCounts;
+		}
+
+		public void setIndependentCounts(final List<Integer> independentCounts) {
+			this.independentCounts = independentCounts;
+		}
+
+		@JsonView(View.Public.class)
+		public Collection<Combination> getCombinatedCounts() {
+			if (combinatedCounts == null) {
+				combinatedCounts = new ArrayList<>();
+			}
+
+			return combinatedCounts;
+		}
+
+		public void setCombinatedCounts(final Collection<Combination> combinatedCounts) {
+			this.combinatedCounts = combinatedCounts;
+		}
+
+		@JsonView(View.Public.class)
+		public int getAbstentionCount() {
+			return abstentionCount;
+		}
+
+		public void setAbstentionCount(final int abstentionCount) {
+			this.abstentionCount = abstentionCount;
+		}
+
+		@Override
+		public String toString() {
+			return new ToStringCreator(this)
+					.append("round", round)
+					.append("independentCounts", independentCounts)
+					.append("combinatedCounts", combinatedCounts)
+					.append("abstentionCount", abstentionCount)
+					.toString();
+		}
+	}
+
+	public static class RoundTransition {
+		private int roundA;
+		private int roundB;
+		private List<Integer> selectedChoiceIndexesA;
+		private List<Integer> selectedChoiceIndexesB;
+		private int count;
+
+		public RoundTransition(final int roundA, final List<Integer> selectedChoiceIndexesA,
+				final int roundB, final List<Integer> selectedChoiceIndexesB, final int count) {
+			this.roundA = roundA;
+			this.roundB = roundB;
+			this.selectedChoiceIndexesA = selectedChoiceIndexesA;
+			this.selectedChoiceIndexesB = selectedChoiceIndexesB;
+			this.count = count;
+		}
+
+		@JsonView(View.Public.class)
+		public int getRoundA() {
+			return roundA;
+		}
+
+		@JsonView(View.Public.class)
+		public int getRoundB() {
+			return roundB;
+		}
+
+		@JsonView(View.Public.class)
+		public List<Integer> getSelectedChoiceIndexesA() {
+			return selectedChoiceIndexesA;
+		}
+
+		@JsonView(View.Public.class)
+		public List<Integer> getSelectedChoiceIndexesB() {
+			return selectedChoiceIndexesB;
+		}
+
+		@JsonView(View.Public.class)
+		public int getCount() {
+			return count;
+		}
+
+		@Override
+		public String toString() {
+			return new ToStringCreator(this)
+					.append("roundA", roundA)
+					.append("selectedChoiceIndexesA", selectedChoiceIndexesA)
+					.append("roundB", roundB)
+					.append("selectedChoiceIndexesB", selectedChoiceIndexesB)
+					.append("count", count)
+					.toString();
+		}
+	}
+
+	private String contentId;
+	private List<RoundStatistics> roundStatistics;
+	private List<RoundTransition> roundTransitions;
+
+	@JsonView(View.Public.class)
+	public String getContentId() {
+		return contentId;
+	}
+
+	public void setContentId(final String contentId) {
+		this.contentId = contentId;
+	}
+
+	@JsonView(View.Public.class)
+	public List<RoundStatistics> getRoundStatistics() {
+		return roundStatistics;
+	}
+
+	public void setRoundStatistics(final List<RoundStatistics> roundStatistics) {
+		this.roundStatistics = roundStatistics;
+	}
+
+	@JsonView(View.Public.class)
+	public List<RoundTransition> getRoundTransitions() {
+		return roundTransitions;
+	}
+
+	public void setRoundTransitions(final List<RoundTransition> roundTransitions) {
+		this.roundTransitions = roundTransitions;
+	}
+
+	@Override
+	public String toString() {
+		return new ToStringCreator(this)
+				.append("contentId", contentId)
+				.append("roundStatistics", roundStatistics)
+				.append("roundTransitions", roundTransitions)
+				.toString();
+	}
+}

src/main/java/de/thm/arsnova/model/Attachment.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import java.util.Objects;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.View;
+
+public class Attachment extends Entity {
+	private String mediaType;
+	private long size;
+	private String originalSourceUrl;
+	private String storageLocation;
+
+	@Override
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getId() {
+		return id;
+	}
+
+	@Override
+	@JsonView(View.Persistence.class)
+	public void setId(final String id) {
+		this.id = id;
+	}
+
+	@Override
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getRevision() {
+		return rev;
+	}
+
+	@Override
+	@JsonView(View.Public.class)
+	public void setRevision(final String rev) {
+		this.rev = rev;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getMediaType() {
+		return mediaType;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setMediaType(final String mediaType) {
+		this.mediaType = mediaType;
+	}
+
+	@JsonView(View.Persistence.class)
+	public long getSize() {
+		return size;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setSize(final long size) {
+		this.size = size;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getOriginalSourceUrl() {
+		return originalSourceUrl;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setOriginalSourceUrl(final String originalSourceUrl) {
+		this.originalSourceUrl = originalSourceUrl;
+	}
+
+	@JsonView(View.Persistence.class)
+	public String getStorageLocation() {
+		return storageLocation;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setStorageLocation(final String storageLocation) {
+		this.storageLocation = storageLocation;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>
+	 * All fields of <tt>Attachment</tt> are included in equality checks.
+	 * </p>
+	 */
+	@Override
+	public boolean equals(final Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (!super.equals(o)) {
+			return false;
+		}
+		final Attachment that = (Attachment) o;
+
+		return size == that.size
+				&& Objects.equals(mediaType, that.mediaType)
+				&& Objects.equals(originalSourceUrl, that.originalSourceUrl)
+				&& Objects.equals(storageLocation, that.storageLocation);
+	}
+
+	@Override
+	protected ToStringCreator buildToString() {
+		return super.buildToString()
+				.append("mediaType", mediaType)
+				.append("size", size)
+				.append("originalSourceUrl", originalSourceUrl)
+				.append("storageLocation", storageLocation);
+	}
+}

src/main/java/de/thm/arsnova/model/AuthenticationProvider.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import java.util.Set;
+
+import de.thm.arsnova.config.properties.AuthenticationProviderProperties;
+import de.thm.arsnova.model.serialization.View;
+
+public class AuthenticationProvider {
+	public enum Type {
+		ANONYMOUS,
+		USERNAME_PASSWORD,
+		SSO
+	}
+
+	private String id;
+	private boolean enabled;
+	private String title;
+	private int order;
+	private Set<AuthenticationProviderProperties.Provider.Role> allowedRoles;
+	private Type type;
+
+	public AuthenticationProvider(final String id, final AuthenticationProviderProperties.Provider provider) {
+		this.id = id;
+		this.enabled = provider.isEnabled();
+		this.title = provider.getTitle();
+		this.order = provider.getOrder();
+		this.allowedRoles = provider.getAllowedRoles();
+
+		if (provider instanceof AuthenticationProviderProperties.Guest) {
+			type = Type.ANONYMOUS;
+		} else if (provider instanceof AuthenticationProviderProperties.Registered
+				|| provider instanceof AuthenticationProviderProperties.Ldap) {
+			type = Type.USERNAME_PASSWORD;
+		} else {
+			type = Type.SSO;
+		}
+	}
+
+	@JsonView(View.Public.class)
+	public String getId() {
+		return id;
+	}
+
+	public void setId(final String id) {
+		this.id = id;
+	}
+
+	public boolean isEnabled() {
+		return enabled;
+	}
+
+	public void setEnabled(final boolean enabled) {
+		this.enabled = enabled;
+	}
+
+	@JsonView(View.Public.class)
+	public String getTitle() {
+		return title;
+	}
+
+	public void setTitle(final String title) {
+		this.title = title;
+	}
+
+	@JsonView(View.Public.class)
+	public int getOrder() {
+		return order;
+	}
+
+	public void setOrder(final int order) {
+		this.order = order;
+	}
+
+	@JsonView(View.Public.class)
+	public Set<AuthenticationProviderProperties.Provider.Role> getAllowedRoles() {
+		return allowedRoles;
+	}
+
+	public void setAllowedRoles(final Set<AuthenticationProviderProperties.Provider.Role> allowedRoles) {
+		this.allowedRoles = allowedRoles;
+	}
+
+	@JsonView(View.Public.class)
+	public Type getType() {
+		return type;
+	}
+
+	public void setType(final Type type) {
+		this.type = type;
+	}
+}

src/main/java/de/thm/arsnova/entities/Authorize.java → src/main/java/de/thm/arsnova/model/Authorize.java

 /*
  * This file is part of ARSnova Backend.
- * Copyright (C) 2012-2015 The ARSnova Team
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
  *
  * ARSnova Backend is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -15,12 +15,18 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-package de.thm.arsnova.entities;
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+
+import de.thm.arsnova.model.serialization.View;
 
 public class Authorize {
 	private String user;
 	private String socketid;
 
+	@JsonView(View.Public.class)
 	public final String getUser() {
 		return user;
 	}
@@ -29,6 +35,7 @@ public class Authorize {
 		this.user = user;
 	}
 
+	@JsonView(View.Public.class)
 	public final String getSocketid() {
 		return socketid;
 	}

src/main/java/de/thm/arsnova/model/ChoiceAnswer.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import java.util.List;
+import javax.validation.constraints.PositiveOrZero;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.View;
+
+public class ChoiceAnswer extends Answer {
+	private List<@PositiveOrZero Integer> selectedChoiceIndexes;
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public List<Integer> getSelectedChoiceIndexes() {
+		return selectedChoiceIndexes;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setSelectedChoiceIndexes(final List<Integer> selectedChoiceIndexes) {
+		this.selectedChoiceIndexes = selectedChoiceIndexes;
+	}
+
+	@Override
+	protected ToStringCreator buildToString() {
+		return super.buildToString()
+				.append("selectedChoiceIndexes", selectedChoiceIndexes);
+	}
+}

src/main/java/de/thm/arsnova/model/ChoiceQuestionContent.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import javax.validation.constraints.NotBlank;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.View;
+
+public class ChoiceQuestionContent extends Content {
+	public static class AnswerOption {
+		@NotBlank
+		private String label;
+
+		private int points;
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public String getLabel() {
+			return label;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public void setLabel(final String label) {
+			this.label = label;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public int getPoints() {
+			return points;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public void setPoints(final int points) {
+			this.points = points;
+		}
+
+		@Override
+		public int hashCode() {
+			return Objects.hash(label, points);
+		}
+
+		@Override
+		public boolean equals(final Object o) {
+			if (this == o) {
+				return true;
+			}
+			if (!super.equals(o)) {
+				return false;
+			}
+			final AnswerOption that = (AnswerOption) o;
+
+			return points == that.points
+					&& Objects.equals(label, that.label);
+		}
+
+		@Override
+		public String toString() {
+			return new ToStringCreator(this)
+					.append("label", label)
+					.append("points", points)
+					.toString();
+		}
+
+	}
+
+	private List<AnswerOption> options = new ArrayList<>();
+	private List<Integer> correctOptionIndexes = new ArrayList<>();
+	private boolean multiple;
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public List<AnswerOption> getOptions() {
+		return options;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setOptions(final List<AnswerOption> options) {
+		this.options = options;
+	}
+
+	/* TODO: A new JsonView is needed here. */
+	@JsonView(View.Persistence.class)
+	public List<Integer> getCorrectOptionIndexes() {
+		return correctOptionIndexes;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setCorrectOptionIndexes(final List<Integer> correctOptionIndexes) {
+		this.correctOptionIndexes = correctOptionIndexes;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public boolean isMultiple() {
+		return multiple;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setMultiple(final boolean multiple) {
+		this.multiple = multiple;
+	}
+
+	@Override
+	protected ToStringCreator buildToString() {
+		return super.buildToString()
+				.append("options", options)
+				.append("correctOptionIndexes", correctOptionIndexes)
+				.append("multiple", multiple);
+	}
+}

src/main/java/de/thm/arsnova/model/ClientAuthentication.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.View;
+
+public class ClientAuthentication {
+	private String userId;
+	private String loginId;
+	private UserProfile.AuthProvider authProvider;
+	private String token;
+
+	public ClientAuthentication(final String userId, final String loginId, final UserProfile.AuthProvider authProvider,
+			final String token) {
+		this.userId = userId;
+		this.loginId = loginId;
+		this.authProvider = authProvider;
+		this.token = token;
+	}
+
+	@JsonView(View.Public.class)
+	public String getUserId() {
+		return userId;
+	}
+
+	@JsonView(View.Public.class)
+	public String getLoginId() {
+		return loginId;
+	}
+
+	@JsonView(View.Public.class)
+	public UserProfile.AuthProvider getAuthProvider() {
+		return authProvider;
+	}
+
+	@JsonView(View.Public.class)
+	public String getToken() {
+		return token;
+	}
+
+	@Override
+	public String toString() {
+		return new ToStringCreator(this)
+				.append("userId", userId)
+				.append("loginId", loginId)
+				.append("authProvider", authProvider)
+				.append("token", token)
+				.toString();
+	}
+}

src/main/java/de/thm/arsnova/model/Comment.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import java.util.Date;
+import java.util.Map;
+import java.util.Objects;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.View;
+
+public class Comment extends Entity {
+	@NotEmpty
+	private String roomId;
+
+	@NotEmpty
+	private String creatorId;
+
+	@NotBlank
+	private String subject;
+
+	@NotBlank
+	private String body;
+
+	@NotNull
+	private Date timestamp;
+
+	private boolean read;
+	private Map<String, Map<String, Object>> extensions;
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getRoomId() {
+		return roomId;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setRoomId(final String roomId) {
+		this.roomId = roomId;
+	}
+
+	@JsonView(View.Persistence.class)
+	public String getCreatorId() {
+		return creatorId;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setCreatorId(final String creatorId) {
+		this.creatorId = creatorId;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getSubject() {
+		return subject;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setSubject(final String subject) {
+		this.subject = subject;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getBody() {
+		return body;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setBody(final String body) {
+		this.body = body;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public Date getTimestamp() {
+		return timestamp;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setTimestamp(final Date timestamp) {
+		this.timestamp = timestamp;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public boolean isRead() {
+		return read;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setRead(final boolean read) {
+		this.read = read;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public Map<String, Map<String, Object>> getExtensions() {
+		return extensions;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setExtensions(final Map<String, Map<String, Object>> extensions) {
+		this.extensions = extensions;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>
+	 * The following fields of <tt>LogEntry</tt> are excluded from equality checks:
+	 * {@link #extensions}.
+	 * </p>
+	 */
+	@Override
+	public boolean equals(final Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (!super.equals(o)) {
+			return false;
+		}
+		final Comment comment = (Comment) o;
+
+		return read == comment.read
+				&& Objects.equals(roomId, comment.roomId)
+				&& Objects.equals(creatorId, comment.creatorId)
+				&& Objects.equals(subject, comment.subject)
+				&& Objects.equals(body, comment.body)
+				&& Objects.equals(timestamp, comment.timestamp)
+				&& Objects.equals(extensions, comment.extensions);
+	}
+
+	@Override
+	protected ToStringCreator buildToString() {
+		return super.buildToString()
+				.append("roomId", roomId)
+				.append("creatorId", creatorId)
+				.append("subject", subject)
+				.append("body", body)
+				.append("timestamp", timestamp)
+				.append("read", read);
+	}
+}

src/main/java/de/thm/arsnova/model/Configuration.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import java.util.List;
+import java.util.Map;
+
+import de.thm.arsnova.model.serialization.View;
+
+public class Configuration {
+	private List<AuthenticationProvider> authenticationProviders;
+	private Map<String, Object> features;
+	private Map<String, Object> ui;
+
+	@JsonView(View.Public.class)
+	public List<AuthenticationProvider> getAuthenticationProviders() {
+		return authenticationProviders;
+	}
+
+	public void setAuthenticationProviders(final List<AuthenticationProvider> authenticationProviders) {
+		this.authenticationProviders = authenticationProviders;
+	}
+
+	@JsonView(View.Public.class)
+	public Map<String, Object> getFeatures() {
+		return features;
+	}
+
+	public void setFeatures(final Map<String, Object> features) {
+		this.features = features;
+	}
+
+	@JsonView(View.Public.class)
+	public Map<String, Object> getUi() {
+		return ui;
+	}
+
+	public void setUi(final Map<String, Object> ui) {
+		this.ui = ui;
+	}
+}

src/main/java/de/thm/arsnova/model/Content.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.annotation.JsonView;
+import com.fasterxml.jackson.databind.annotation.JsonTypeIdResolver;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Positive;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.FormatContentTypeIdResolver;
+import de.thm.arsnova.model.serialization.View;
+
+@JsonTypeInfo(
+		use = JsonTypeInfo.Id.CUSTOM,
+		property = "format",
+		visible = true,
+		defaultImpl = Content.class
+)
+@JsonTypeIdResolver(FormatContentTypeIdResolver.class)
+public class Content extends Entity {
+	public enum Format {
+		CHOICE,
+		BINARY,
+		SCALE,
+		NUMBER,
+		TEXT,
+		GRID
+	}
+
+	public static class State {
+		@Positive
+		private int round = 1;
+
+		private Date roundEndTimestamp;
+		private boolean visible = true;
+		private boolean additionalTextVisible = true;
+		private boolean responsesEnabled = true;
+		private boolean responsesVisible = false;
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public int getRound() {
+			return round;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public void setRound(final int round) {
+			this.round = round;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public Date getRoundEndTimestamp() {
+			return roundEndTimestamp;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public void setRoundEndTimestamp(final Date roundEndTimestamp) {
+			this.roundEndTimestamp = roundEndTimestamp;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public boolean isVisible() {
+			return visible;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public boolean isAdditionalTextVisible() {
+			return additionalTextVisible;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public void setAdditionalTextVisible(final boolean additionalTextVisible) {
+			this.additionalTextVisible = additionalTextVisible;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public void setVisible(final boolean visible) {
+			this.visible = visible;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public boolean isResponsesEnabled() {
+			return responsesEnabled;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public void setResponsesEnabled(final boolean responsesEnabled) {
+			this.responsesEnabled = responsesEnabled;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public boolean isResponsesVisible() {
+			return responsesVisible;
+		}
+
+		@JsonView({View.Persistence.class, View.Public.class})
+		public void setResponsesVisible(final boolean responsesVisible) {
+			this.responsesVisible = responsesVisible;
+		}
+
+		@Override
+		public int hashCode() {
+			return Objects.hash(round, roundEndTimestamp, visible, additionalTextVisible, responsesEnabled, responsesVisible);
+		}
+
+		@Override
+		public boolean equals(final Object o) {
+			if (this == o) {
+				return true;
+			}
+			if (!super.equals(o)) {
+				return false;
+			}
+			final State state = (State) o;
+
+			return round == state.round
+					&& visible == state.visible
+					&& additionalTextVisible == state.additionalTextVisible
+					&& responsesEnabled == state.responsesEnabled
+					&& responsesVisible == state.responsesVisible
+					&& Objects.equals(roundEndTimestamp, state.roundEndTimestamp);
+		}
+
+		@Override
+		public String toString() {
+			return new ToStringCreator(this)
+					.append("round", round)
+					.append("roundEndTimestamp", roundEndTimestamp)
+					.append("visible", visible)
+					.append("solutionVisible", additionalTextVisible)
+					.append("responsesEnabled", responsesEnabled)
+					.append("responsesVisible", responsesVisible)
+					.toString();
+		}
+	}
+
+	@NotEmpty
+	private String roomId;
+
+	@NotBlank
+	private String subject;
+
+	@NotBlank
+	private String body;
+
+	@NotNull
+	private Format format;
+
+	private Set<String> groups;
+	private boolean abstentionsAllowed;
+	private State state;
+	private Date timestamp;
+	private String additionalText;
+	private String additionalTextTitle;
+	private Map<String, Map<String, Object>> extensions;
+	private Map<String, String> attachments;
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getRoomId() {
+		return roomId;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setRoomId(final String roomId) {
+		this.roomId = roomId;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getSubject() {
+		return subject;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setSubject(final String subject) {
+		this.subject = subject;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getBody() {
+		return body;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setBody(final String body) {
+		this.body = body;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public Format getFormat() {
+		return format;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setFormat(final Format format) {
+		this.format = format;
+	}
+
+	@JsonView(View.Public.class)
+	public Set<String> getGroups() {
+		if (groups == null) {
+			groups = new HashSet<>();
+		}
+
+		return groups;
+	}
+
+	/* Content groups are persisted in the Room */
+	@JsonView(View.Public.class)
+	public void setGroups(final Set<String> groups) {
+		this.groups = groups;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public State getState() {
+		return state != null ? state : (state = new State());
+	}
+
+	public void resetState() {
+		this.state = new State();
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setState(final State state) {
+		this.state = state;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public Date getTimestamp() {
+		return timestamp;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setTimestamp(final Date timestamp) {
+		this.timestamp = timestamp;
+	}
+
+	@JsonView({View.Persistence.class, View.Owner.class})
+	public String getAdditionalText() {
+		return additionalText;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setAdditionalText(final String additionalText) {
+		this.additionalText = additionalText;
+	}
+
+	@JsonView({View.Persistence.class, View.Owner.class})
+	public String getAdditionalTextTitle() {
+		return additionalTextTitle;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setAdditionalTextTitle(final String additionalTextTitle) {
+		this.additionalTextTitle = additionalTextTitle;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public Map<String, Map<String, Object>> getExtensions() {
+		return extensions;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setExtensions(final Map<String, Map<String, Object>> extensions) {
+		this.extensions = extensions;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public Map<String, String> getAttachments() {
+		return attachments;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setAttachments(final Map<String, String> attachments) {
+		this.attachments = attachments;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public boolean isAbstentionsAllowed() {
+		return abstentionsAllowed;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setAbstentionsAllowed(final boolean abstentionsAllowed) {
+		this.abstentionsAllowed = abstentionsAllowed;
+	}
+
+	@JsonView(View.Persistence.class)
+	@Override
+	public Class<? extends Entity> getType() {
+		return Content.class;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>
+	 * The following fields of <tt>LogEntry</tt> are excluded from equality checks:
+	 * {@link #state}, {@link #extensions}, {@link #attachments}.
+	 * </p>
+	 */
+	@Override
+	public boolean equals(final Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (!super.equals(o)) {
+			return false;
+		}
+		final Content content = (Content) o;
+
+		return Objects.equals(roomId, content.roomId)
+				&& Objects.equals(subject, content.subject)
+				&& Objects.equals(body, content.body)
+				&& format == content.format
+				&& Objects.equals(groups, content.groups)
+				&& Objects.equals(timestamp, content.timestamp);
+	}
+
+	@Override
+	protected ToStringCreator buildToString() {
+		return super.buildToString()
+				.append("roomId", roomId)
+				.append("subject", subject)
+				.append("body", body)
+				.append("format", format)
+				.append("groups", groups)
+				.append("abstentionsAllowed", abstentionsAllowed)
+				.append("state", state)
+				.append("additionalText", additionalText)
+				.append("additionalTextTitle", additionalTextTitle)
+				.append("timestamp", timestamp)
+				.append("attachments", attachments);
+	}
+}

src/main/java/de/thm/arsnova/model/ContentGroup.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.	 If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotEmpty;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.View;
+
+public class ContentGroup extends Entity {
+	@NotEmpty
+	private String roomId;
+
+	@NotBlank
+	private String name;
+
+	private Set<String> contentIds;
+	private boolean autoSort;
+
+	public ContentGroup() {
+
+	}
+
+	public ContentGroup(final String roomId, final String name) {
+		this.roomId = roomId;
+		this.name = name;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getRoomId() {
+		return roomId;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setRoomId(final String roomId) {
+		this.roomId = roomId;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getName() {
+		return this.name;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setName(final String name) {
+		this.name = name;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public Set<String> getContentIds() {
+		if (contentIds == null) {
+			contentIds = new HashSet<>();
+		}
+
+		return contentIds;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setContentIds(final Set<String> contentIds) {
+		this.contentIds = contentIds;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public boolean isAutoSort() {
+		return autoSort;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setAutoSort(final boolean autoSort) {
+		this.autoSort = autoSort;
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(name, contentIds, autoSort);
+	}
+
+	@Override
+	public boolean equals(final Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+		final ContentGroup that = (ContentGroup) o;
+
+		return autoSort == that.autoSort
+			&& Objects.equals(name, that.name)
+			&& Objects.equals(contentIds, that.contentIds);
+	}
+
+	@Override
+	public String toString() {
+		return new ToStringCreator(this)
+			.append("name", name)
+			.append("contentIds", contentIds)
+			.append("autoSort", autoSort)
+			.toString();
+	}
+}

src/main/java/de/thm/arsnova/model/Entity.java

+/*
+ * This file is part of ARSnova Backend.
+ * Copyright (C) 2012-2019 The ARSnova Team and Contributors
+ *
+ * ARSnova Backend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ARSnova Backend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.thm.arsnova.model;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import java.util.Date;
+import java.util.Objects;
+import org.springframework.core.style.ToStringCreator;
+
+import de.thm.arsnova.model.serialization.View;
+
+/**
+ * Used as base for classes that represent persistent data with an unique ID.
+ *
+ * @author Daniel Gerhardt
+ */
+public abstract class Entity {
+	protected String id;
+	protected String rev;
+	protected Date creationTimestamp;
+	protected Date updateTimestamp;
+	private boolean internal;
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getId() {
+		return id;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setId(final String id) {
+		this.id = id;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public String getRevision() {
+		return rev;
+	}
+
+	@JsonView({View.Persistence.class, View.Public.class})
+	public void setRevision(final String rev) {
+		this.rev = rev;
+	}
+
+	@JsonView(View.Persistence.class)
+	public Date getCreationTimestamp() {
+		return creationTimestamp;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setCreationTimestamp(final Date creationTimestamp) {
+		this.creationTimestamp = creationTimestamp;
+	}
+
+	@JsonView(View.Persistence.class)
+	public Date getUpdateTimestamp() {
+		return updateTimestamp;
+	}
+
+	@JsonView(View.Persistence.class)
+	public void setUpdateTimestamp(final Date updateTimestamp) {
+		this.updateTimestamp = updateTimestamp;
+	}
+
+	@JsonView(View.Persistence.class)
+	public Class<? extends Entity> getType() {
+		return getClass();
+	}
+
+	public boolean isInternal() {
+		return internal;
+	}
+
+	public void setInternal(final boolean internal) {
+		this.internal = internal;
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(id, rev, creationTimestamp, updateTimestamp);
+	}
+
+	/**
+	 * Use this helper method when overriding {@link #hashCode()}.
+	 *
+	 * @param init The result of <tt>super.hashCode()</tt>
+	 * @param additionalFields Fields introduced by the subclass which should be included in the hash code generation
+	 *
+	 * @see java.util.Arrays#hashCode(Object[])
+	 */
+	protected int hashCode(final int init, final Object... additionalFields) {
+		int result = init;
+		if (additionalFields == null) {
+			return result;
+		}
+		for (final Object element : additionalFields) {
+			result = 31 * result + (element == null ? 0 : element.hashCode());
+		}
+
+		return result;
+	}
+
+	@Override
+	public boolean equals(final Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+		final Entity entity = (Entity) o;
+
+		return Objects.equals(id, entity.id)
+				&& Objects.equals(rev, entity.rev)
+				&& Objects.equals(creationTimestamp, entity.creationTimestamp)
+				&& Objects.equals(updateTimestamp, entity.updateTimestamp);
+	}
+
+	@Override
+	public String toString() {
+		return buildToString().toString();
+	}
+
+	/**
+	 * Use this helper method to adjust the output of {@link #toString()}.
+	 * Override this method instead of <tt>toString()</tt> and call <tt>super.buildToString()</tt>.
+	 * Additional fields can be added to the String by calling
+	 * {@link org.springframework.core.style.ToStringCreator#append} on the <tt>ToStringCreator</tt>.
+	 */
+	protected ToStringCreator buildToString() {
+		final ToStringCreator toStringCreator = new ToStringCreator(this);
+		toStringCreator
+				.append("id", id)
+				.append("revision", rev)
+				.append("creationTimestamp", creationTimestamp)
+				.append("updateTimestamp", updateTimestamp);
+
+		return toStringCreator;
+	}
+}