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/*******************************************************************************
* Copyright (c) 2000, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.ui.internal.views;
import java.util.LinkedList;
import org.eclipse.help.IContext2;
import org.eclipse.help.IHelpResource;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
public class ContextHelpSorter extends ViewerComparator {
private IContext2 context;
private LinkedList<String> list;
public ContextHelpSorter(IContext2 context) {
super(ReusableHelpPart.SHARED_COLLATOR);
list = new LinkedList<>();
this.context = context;
}
@Override
public void sort(Viewer viewer, Object[] elements) {
for (int i = 0; i < elements.length; i++) {
IHelpResource r1 = (IHelpResource) elements[i];
String c1 = context.getCategory(r1);
if (!list.contains(c1)) {
list.add(c1);
}
}
super.sort(viewer, elements);
}
@Override
public int compare(Viewer viewer, Object e1, Object e2) {
if (!(e2 instanceof IHelpResource)) {
return -1;
}
if (!(e1 instanceof IHelpResource)) {
return 1;
}
IHelpResource r1 = (IHelpResource) e1;
IHelpResource r2 = (IHelpResource) e2;
String c1 = context.getCategory(r1);
String c2 = context.getCategory(r2);
int i1 = list.indexOf(c1);
int i2 = list.indexOf(c2);
return i1 - i2;
}
}
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