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/*******************************************************************************
* Copyright (c) 2000, 2010 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.ui.viewers;
import org.eclipse.equinox.internal.p2.ui.ProvUI;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
public class IUComparator extends ViewerComparator {
public static final int IU_NAME = 0;
public static final int IU_ID = 1;
private int key;
private boolean showingId = false;
public IUComparator(int sortKey) {
this.key = sortKey;
showingId = sortKey == IU_ID;
}
/**
* Use the specified column config to determine
* whether the id should be used in lieu of an empty name
* when sorting.
*
* @param columnConfig
*/
public void useColumnConfig(IUColumnConfig[] columnConfig) {
for (int i = 0; i < columnConfig.length; i++)
if (columnConfig[i].getColumnType() == IUColumnConfig.COLUMN_ID) {
showingId = true;
break;
}
}
@Override
public int compare(Viewer viewer, Object obj1, Object obj2) {
IInstallableUnit iu1 = ProvUI.getAdapter(obj1, IInstallableUnit.class);
IInstallableUnit iu2 = ProvUI.getAdapter(obj2, IInstallableUnit.class);
if (iu1 == null || iu2 == null)
// If these are not iu's use the super class comparator.
return super.compare(viewer, obj1, obj2);
String key1, key2;
if (key == IU_NAME) {
// Compare the iu names in the default locale.
// If a name is not defined, we use blank if we know the id is shown in another
// column. If the id is not shown elsewhere, then we are displaying it, so use
// the id instead.
key1 = iu1.getProperty(IInstallableUnit.PROP_NAME, null);
if (key1 == null)
if (showingId)
key1 = ""; //$NON-NLS-1$
else
key1 = iu1.getId();
key2 = iu2.getProperty(IInstallableUnit.PROP_NAME, null);
if (key2 == null)
if (showingId)
key2 = ""; //$NON-NLS-1$
else
key2 = iu2.getId();
} else {
key1 = iu1.getId();
key2 = iu2.getId();
}
int result = 0;
result = key1.compareToIgnoreCase(key2);
if (result == 0) {
// We want to show later versions first so compare backwards.
result = iu2.getVersion().compareTo(iu1.getVersion());
}
return result;
}
}
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