/*******************************************************************************
* Copyright (c) 2005, 2008 QNX Software Systems 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:
* QNX Software Systems - initial API and implementation
*******************************************************************************/
/*
* Created on Aug 30, 2004
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package org.eclipse.cdt.internal.ui.search;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.ui.IWorkingSet;
import org.eclipse.ui.PlatformUI;
/**
* @author bgheorgh
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class LRUWorkingSets {
ArrayList<IWorkingSet[]> workingSetsCache = null;
int size=0;
public LRUWorkingSets(int size){
workingSetsCache = new ArrayList<IWorkingSet[]>(size);
this.size = size;
}
public void add(IWorkingSet[] workingSet){
cleanUpCache();
//See if this working set has been previously added to the
IWorkingSet[] existingWorkingSets= find(workingSetsCache, workingSet);
if (existingWorkingSets != null)
workingSetsCache.remove(existingWorkingSets);
else if (workingSetsCache.size() == size)
workingSetsCache.remove(size - 1);
workingSetsCache.add(0, workingSet);
}
private IWorkingSet[] find(ArrayList<IWorkingSet[]> list, IWorkingSet[] workingSet) {
Set<IWorkingSet> workingSetList= new HashSet<IWorkingSet>(Arrays.asList(workingSet));
Iterator<IWorkingSet[]> iter= list.iterator();
while (iter.hasNext()) {
IWorkingSet[] lruWorkingSets= iter.next();
Set<IWorkingSet> lruWorkingSetList= new HashSet<IWorkingSet>(Arrays.asList(lruWorkingSets));
if (lruWorkingSetList.equals(workingSetList))
return lruWorkingSets;
}
return null;
}
private void cleanUpCache(){
//Remove any previously deleted entries
Iterator<IWorkingSet[]> iter = workingSetsCache.iterator();
while (iter.hasNext()){
IWorkingSet[] workingSet = iter.next();
for (int i= 0; i < workingSet.length; i++) {
if (PlatformUI.getWorkbench().getWorkingSetManager().getWorkingSet(workingSet[i].getName()) == null) {
workingSetsCache.remove(workingSet);
break;
}
}
}
}
public Iterator<IWorkingSet[]> iterator() {
return workingSetsCache.iterator();
}
}