X-Git-Url: http://git.argeo.org/?a=blobdiff_plain;ds=sidebyside;f=org.argeo.eclipse.ui%2Fsrc%2Fmain%2Fjava%2Forg%2Fargeo%2Feclipse%2Fui%2Fjcr%2Futils%2FNodeViewerComparer.java;fp=org.argeo.eclipse.ui%2Fsrc%2Fmain%2Fjava%2Forg%2Fargeo%2Feclipse%2Fui%2Fjcr%2Futils%2FNodeViewerComparer.java;h=5a94ee76abaa285fe0efca0f31bba09300290439;hb=59fd3768e7925334805dca3825f6f87f082d9810;hp=0000000000000000000000000000000000000000;hpb=10601692cf0865b7e7fcb68c14b0e2fc3ea791a3;p=lgpl%2Fargeo-commons.git

diff --git a/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/jcr/utils/NodeViewerComparer.java b/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/jcr/utils/NodeViewerComparer.java
new file mode 100644
index 000000000..5a94ee76a
--- /dev/null
+++ b/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/jcr/utils/NodeViewerComparer.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.argeo.eclipse.ui.jcr.utils;
+
+import javax.jcr.Node;
+import javax.jcr.RepositoryException;
+
+import org.argeo.ArgeoException;
+import org.eclipse.jface.viewers.IElementComparer;
+
+/** Compare JCR nodes based on their JCR identifiers, for use in JFace viewers. */
+public class NodeViewerComparer implements IElementComparer {
+
+	// force comparison on Node IDs only.
+	public boolean equals(Object elementA, Object elementB) {
+		if (!(elementA instanceof Node) || !(elementB instanceof Node)) {
+			return elementA == null ? elementB == null : elementA
+					.equals(elementB);
+		} else {
+
+			boolean result = false;
+			try {
+				String idA = ((Node) elementA).getIdentifier();
+				String idB = ((Node) elementB).getIdentifier();
+				result = idA == null ? idB == null : idA.equals(idB);
+			} catch (RepositoryException re) {
+				throw new ArgeoException("cannot compare nodes", re);
+			}
+
+			return result;
+		}
+	}
+
+	public int hashCode(Object element) {
+		// TODO enhanced this method.
+		return element.getClass().toString().hashCode();
+	}
+}
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