--- /dev/null
+package org.argeo.eclipse.ui.jcr.lists;
+
+import java.math.BigDecimal;
+import java.util.Calendar;
+
+import javax.jcr.Node;
+import javax.jcr.PropertyType;
+import javax.jcr.RepositoryException;
+import javax.jcr.Value;
+import javax.jcr.ValueFormatException;
+
+import org.argeo.eclipse.ui.EclipseUiException;
+import org.eclipse.jface.viewers.Viewer;
+import org.eclipse.jface.viewers.ViewerComparator;
+
+/**
+ * Base comparator to enable ordering on Table or Tree viewer that display Jcr
+ * Nodes.
+ *
+ * Note that the following snippet must be added before setting the comparator
+ * to the corresponding control: <code>
+ * // IMPORTANT: initialize comparator before setting it
+ * JcrColumnDefinition firstCol = colDefs.get(0);
+ * comparator.setColumn(firstCol.getPropertyType(),
+ * firstCol.getPropertyName());
+ * viewer.setComparator(comparator); </code>
+ */
+public class NodeViewerComparator extends ViewerComparator {
+ private static final long serialVersionUID = -7782916140737279027L;
+
+ protected String propertyName;
+
+ protected int propertyType;
+ public static final int ASCENDING = 0, DESCENDING = 1;
+ protected int direction = DESCENDING;
+
+ public NodeViewerComparator() {
+ }
+
+ /**
+ * e1 and e2 must both be Jcr nodes.
+ *
+ * @param viewer
+ * @param e1
+ * @param e2
+ * @return
+ */
+ @Override
+ public int compare(Viewer viewer, Object e1, Object e2) {
+ int rc = 0;
+ long lc = 0;
+
+ try {
+ Node n1 = (Node) e1;
+ Node n2 = (Node) e2;
+
+ Value v1 = null;
+ Value v2 = null;
+ if (n1.hasProperty(propertyName))
+ v1 = n1.getProperty(propertyName).getValue();
+ if (n2.hasProperty(propertyName))
+ v2 = n2.getProperty(propertyName).getValue();
+
+ if (v2 == null && v1 == null)
+ return 0;
+ else if (v2 == null)
+ return -1;
+ else if (v1 == null)
+ return 1;
+
+ switch (propertyType) {
+ case PropertyType.STRING:
+ rc = v1.getString().compareTo(v2.getString());
+ break;
+ case PropertyType.BOOLEAN:
+ boolean b1 = v1.getBoolean();
+ boolean b2 = v2.getBoolean();
+ if (b1 == b2)
+ rc = 0;
+ else
+ // we assume true is greater than false
+ rc = b1 ? 1 : -1;
+ break;
+ case PropertyType.DATE:
+ Calendar c1 = v1.getDate();
+ Calendar c2 = v2.getDate();
+ if (c1 == null || c2 == null)
+ // log.trace("undefined date");
+ ;
+ lc = c1.getTimeInMillis() - c2.getTimeInMillis();
+ if (lc < Integer.MIN_VALUE)
+ rc = -1;
+ else if (lc > Integer.MAX_VALUE)
+ rc = 1;
+ else
+ rc = (int) lc;
+ break;
+ case PropertyType.LONG:
+ long l1;
+ long l2;
+ // TODO Sometimes an empty string is set instead of a long
+ try {
+ l1 = v1.getLong();
+ } catch (ValueFormatException ve) {
+ l1 = 0;
+ }
+ try {
+ l2 = v2.getLong();
+ } catch (ValueFormatException ve) {
+ l2 = 0;
+ }
+
+ lc = l1 - l2;
+ if (lc < Integer.MIN_VALUE)
+ rc = -1;
+ else if (lc > Integer.MAX_VALUE)
+ rc = 1;
+ else
+ rc = (int) lc;
+ break;
+ case PropertyType.DECIMAL:
+ BigDecimal bd1 = v1.getDecimal();
+ BigDecimal bd2 = v2.getDecimal();
+ rc = bd1.compareTo(bd2);
+ break;
+ case PropertyType.DOUBLE:
+ Double d1 = v1.getDouble();
+ Double d2 = v2.getDouble();
+ rc = d1.compareTo(d2);
+ break;
+ default:
+ throw new EclipseUiException(
+ "Unimplemented comparaison for PropertyType "
+ + propertyType);
+ }
+ // If descending order, flip the direction
+ if (direction == DESCENDING) {
+ rc = -rc;
+ }
+
+ } catch (RepositoryException re) {
+ throw new EclipseUiException("Unexpected error "
+ + "while comparing nodes", re);
+ }
+ return rc;
+ }
+
+ /**
+ * @param propertyType
+ * Corresponding JCR type
+ * @param propertyName
+ * name of the property to use.
+ */
+ public void setColumn(int propertyType, String propertyName) {
+ if (this.propertyName != null && this.propertyName.equals(propertyName)) {
+ // Same column as last sort; toggle the direction
+ direction = 1 - direction;
+ } else {
+ // New column; do an ascending sort
+ this.propertyType = propertyType;
+ this.propertyName = propertyName;
+ direction = ASCENDING;
+ }
+ }
+
+ // Getters and setters
+ protected String getPropertyName() {
+ return propertyName;
+ }
+
+ protected void setPropertyName(String propertyName) {
+ this.propertyName = propertyName;
+ }
+
+ protected int getPropertyType() {
+ return propertyType;
+ }
+
+ protected void setPropertyType(int propertyType) {
+ this.propertyType = propertyType;
+ }
+
+ protected int getDirection() {
+ return direction;
+ }
+
+ protected void setDirection(int direction) {
+ this.direction = direction;
+ }
+}
projects / lgpl / argeo-commons.git / blobdiff