Add the version revisions system.

src/main/java/org/codiki/core/entities/persistence/Version.java

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+package org.codiki.core.entities.persistence;
+
+import java.io.Serializable;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+/**
+ * Entity which represents a version for the version revisions panel.
+ * 
+ * @author florian
+ *
+ */
+@Entity
+@Table(name="version")
+public class Version implements Serializable {
+	private static final long serialVersionUID = -8803744005903941330L;
+
+	@Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	private Long id;
+	
+	private String number;
+
+	public Long getId() {
+		return id;
+	}
+
+	public void setId(Long id) {
+		this.id = id;
+	}
+
+	public String getNumber() {
+		return number;
+	}
+
+	public void setNumber(String number) {
+		this.number = number;
+	}
+}

src/main/java/org/codiki/core/entities/persistence/VersionRevision.java

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+package org.codiki.core.entities.persistence;
+
+import java.io.Serializable;
+
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+import javax.persistence.Table;
+
+@Entity
+@Table(name="version_revision")
+public class VersionRevision implements Serializable {
+	private static final long serialVersionUID = 1837590467941917225L;
+
+	@Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	private Long id;
+	
+	private String text;
+	
+	@ManyToOne(fetch = FetchType.LAZY)
+	@JoinColumn(name = "version_id")
+	private Version version;
+
+	public Long getId() {
+		return id;
+	}
+
+	public void setId(Long id) {
+		this.id = id;
+	}
+
+	public String getText() {
+		return text;
+	}
+
+	public void setText(String text) {
+		this.text = text;
+	}
+
+	public Version getVersion() {
+		return version;
+	}
+
+	public void setVersion(Version version) {
+		this.version = version;
+	}
+}

src/main/java/org/codiki/core/repositories/VersionRepository.java

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+package org.codiki.core.repositories;
+
+import java.util.Optional;
+
+import org.codiki.core.entities.persistence.Version;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface VersionRepository extends CrudRepository<Version, Long> {
+	@Query("SELECT v FROM Version v ORDER BY v.number DESC")
+	Iterable<Version> findAllOrderByNumber();
+	
+	Optional<Version> findByNumber(String pNumber);
+}

src/main/java/org/codiki/core/repositories/VersionRevisionRepository.java

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+package org.codiki.core.repositories;
+
+import java.util.List;
+
+import org.codiki.core.entities.persistence.VersionRevision;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface VersionRevisionRepository extends CrudRepository<VersionRevision, Long> {
+	
+	@Query("SELECT vr FROM VersionRevision vr JOIN FETCH vr.version WHERE vr.version.number = :versionNumber")
+	List<VersionRevision> findByVersionNumber(@Param("versionNumber") final String pVersionNumber);
+}

src/main/java/org/codiki/versionrevisions/VersionRevisionController.java

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+package org.codiki.versionrevisions;
+
+import org.codiki.core.entities.persistence.Version;
+import org.codiki.core.entities.persistence.VersionRevision;
+import org.codiki.core.repositories.VersionRepository;
+import org.codiki.core.repositories.VersionRevisionRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/versionrevisions")
+public class VersionRevisionController {
+
+	@Autowired
+	private VersionRevisionRepository repository;
+	
+	@Autowired
+	private VersionRepository versionRepository;
+	
+	@GetMapping("/versions")
+	public Iterable<Version> getVersions() {
+		return versionRepository.findAllOrderByNumber();
+	}
+	
+	@GetMapping("/{versionNumber}")
+	public Iterable<VersionRevision> getVersionRevisionByVersionNumber(
+			@PathVariable("versionNumber") final String pVersionNumber) {
+		return repository.findByVersionNumber(pVersionNumber);
+	}
+}