X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=jcr%2Forg.argeo.cms.ui%2Fsrc%2Forg%2Fargeo%2Feclipse%2Fui%2Fjcr%2Futil%2FNodeViewerComparer.java;fp=jcr%2Forg.argeo.cms.ui%2Fsrc%2Forg%2Fargeo%2Feclipse%2Fui%2Fjcr%2Futil%2FNodeViewerComparer.java;h=54b795f3b92b6ed53fbd661f94741ee885af09b7;hb=8282011b0e20e80704b209ad55fa9fb132e16280;hp=0000000000000000000000000000000000000000;hpb=633a8acd189cc22f06944d278879601189be1bc8;p=lgpl%2Fargeo-commons.git

diff --git a/jcr/org.argeo.cms.ui/src/org/argeo/eclipse/ui/jcr/util/NodeViewerComparer.java b/jcr/org.argeo.cms.ui/src/org/argeo/eclipse/ui/jcr/util/NodeViewerComparer.java
new file mode 100644
index 000000000..54b795f3b
--- /dev/null
+++ b/jcr/org.argeo.cms.ui/src/org/argeo/eclipse/ui/jcr/util/NodeViewerComparer.java
@@ -0,0 +1,36 @@
+package org.argeo.eclipse.ui.jcr.util;
+
+import javax.jcr.Node;
+import javax.jcr.RepositoryException;
+
+import org.argeo.eclipse.ui.EclipseUiException;
+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 EclipseUiException("cannot compare nodes", re);
+			}
+
+			return result;
+		}
+	}
+
+	public int hashCode(Object element) {
+		// TODO enhanced this method.
+		return element.getClass().toString().hashCode();
+	}
+}
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