fix copyright header, javadoc, and warnings

plugins/com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/TxRelation.java

@@ -1,30 +1,66 @@
+/*******************************************************************************
+ * Copyright (c) 2020 MINRES Technologies GmbH and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     MINRES Technologies GmbH - initial API and implementation
+ *******************************************************************************/
 package com.minres.scviewer.database.text;
 
 import com.minres.scviewer.database.RelationType;
 import com.minres.scviewer.database.tx.ITx;
 import com.minres.scviewer.database.tx.ITxRelation;
 
+/**
+ * The Class TxRelation.
+ */
 class TxRelation implements ITxRelation {
 
+	/** The loader. */
 	final TextDbLoader loader;
-	
+
+	/** The scv relation. */
 	final ScvRelation scvRelation;
-	
+
+	/**
+	 * Instantiates a new tx relation.
+	 *
+	 * @param loader      the loader
+	 * @param scvRelation the scv relation
+	 */
 	public TxRelation(TextDbLoader loader, ScvRelation scvRelation) {
 		this.loader = loader;
 		this.scvRelation = scvRelation;
 	}
 
+	/**
+	 * Gets the relation type.
+	 *
+	 * @return the relation type
+	 */
 	@Override
 	public RelationType getRelationType() {
 		return scvRelation.relationType;
 	}
 
+	/**
+	 * Gets the source.
+	 *
+	 * @return the source
+	 */
 	@Override
 	public ITx getSource() {
 		return loader.getTransaction(scvRelation.source);
 	}
 
+	/**
+	 * Gets the target.
+	 *
+	 * @return the target
+	 */
 	@Override
 	public ITx getTarget() {
 		return loader.getTransaction(scvRelation.target);