content: /*******************************************************************************
   * Copyright (c) 2000, 2008 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:
   *   Jesper Kamstrup Linnet (eclipse@kamstrup-linnet.dk) - initial API and implementation 
   *          (report 36180: Callers/Callees view)
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.ui.callhierarchy;
  
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Set;
  
  import org.eclipse.jface.dialogs.IDialogSettings;
  import org.eclipse.ui.IWorkingSet;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.internal.corext.util.Messages;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.internal.ui.search.LRUWorkingSetsList;
  import org.eclipse.wst.jsdt.internal.ui.search.WorkingSetComparator;
  
  public class SearchUtil {
  	
  	// LRU working sets
  	public static int LRU_WORKINGSET_LIST_SIZE= 3;
  	private static LRUWorkingSetsList fgLRUWorkingSets;
  	// Settings store
  	private static final String DIALOG_SETTINGS_KEY= "CallHierarchySearchScope"; //$NON-NLS-1$
  	private static final String STORE_LRU_WORKING_SET_NAMES= "lastUsedWorkingSetNames"; //$NON-NLS-1$
  	private static IDialogSettings fgSettingsStore;
  	
  	/**
  	 * Updates the LRU list of working sets.
  	 * 
  	 * @param workingSets   the workings sets to be added to the LRU list
  	 */
  	public static void updateLRUWorkingSets(IWorkingSet[] workingSets) {
  		if (workingSets == null || workingSets.length < 1)
  			return;
  		
  		SearchUtil.getLRUWorkingSets().add(workingSets);
  		SearchUtil.saveState();
  	}
  	
  	private static void saveState() {
  		IWorkingSet[] workingSets;
  		Iterator iter= SearchUtil.fgLRUWorkingSets.iterator();
  		int i= 0;
  		while (iter.hasNext()) {
  			workingSets= (IWorkingSet[])iter.next();
  			String[] names= new String[workingSets.length];
  			for (int j= 0; j < workingSets.length; j++)
  				names[j]= workingSets[j].getName();
  			SearchUtil.fgSettingsStore.put(SearchUtil.STORE_LRU_WORKING_SET_NAMES + i, names);
  			i++;
  		}
  	}
  	
  	public static LRUWorkingSetsList getLRUWorkingSets() {
  		if (SearchUtil.fgLRUWorkingSets == null) {
  			restoreState();
  		}
  		return SearchUtil.fgLRUWorkingSets;
  	}
  	
  	static void restoreState() {
  		SearchUtil.fgLRUWorkingSets= new LRUWorkingSetsList(SearchUtil.LRU_WORKINGSET_LIST_SIZE);
  		SearchUtil.fgSettingsStore= JavaScriptPlugin.getDefault().getDialogSettings().getSection(SearchUtil.DIALOG_SETTINGS_KEY);
  		if (SearchUtil.fgSettingsStore == null)
  			SearchUtil.fgSettingsStore= JavaScriptPlugin.getDefault().getDialogSettings().addNewSection(SearchUtil.DIALOG_SETTINGS_KEY);
  		
  		boolean foundLRU= false;
  		for (int i= SearchUtil.LRU_WORKINGSET_LIST_SIZE - 1; i >= 0; i--) {
  			String[] lruWorkingSetNames= SearchUtil.fgSettingsStore.getArray(SearchUtil.STORE_LRU_WORKING_SET_NAMES + i);
  			if (lruWorkingSetNames != null) {
  				Set workingSets= new HashSet(2);
  				for (int j= 0; j < lruWorkingSetNames.length; j++) {
  					IWorkingSet workingSet= PlatformUI.getWorkbench().getWorkingSetManager().getWorkingSet(lruWorkingSetNames[j]);
  					if (workingSet != null) {
  						workingSets.add(workingSet);
  					}
  				}
  				foundLRU= true;
  				if (!workingSets.isEmpty())
  					SearchUtil.fgLRUWorkingSets.add((IWorkingSet[])workingSets.toArray(new IWorkingSet[workingSets.size()]));
  			}
  		}
  		if (!foundLRU)
  			// try old preference format
  			restoreFromOldFormat();
  	}
  	
  	private static void restoreFromOldFormat() {
  		SearchUtil.fgLRUWorkingSets= new LRUWorkingSetsList(SearchUtil.LRU_WORKINGSET_LIST_SIZE);
  		SearchUtil.fgSettingsStore= JavaScriptPlugin.getDefault().getDialogSettings().getSection(SearchUtil.DIALOG_SETTINGS_KEY);
  		if (SearchUtil.fgSettingsStore == null)
  			SearchUtil.fgSettingsStore= JavaScriptPlugin.getDefault().getDialogSettings().addNewSection(SearchUtil.DIALOG_SETTINGS_KEY);
  		
  		boolean foundLRU= false;
  		String[] lruWorkingSetNames= SearchUtil.fgSettingsStore.getArray(SearchUtil.STORE_LRU_WORKING_SET_NAMES);
  		if (lruWorkingSetNames != null) {
  			for (int i= lruWorkingSetNames.length - 1; i >= 0; i--) {
  				IWorkingSet workingSet= PlatformUI.getWorkbench().getWorkingSetManager().getWorkingSet(lruWorkingSetNames[i]);
  				if (workingSet != null) {
  					foundLRU= true;
  					SearchUtil.fgLRUWorkingSets.add(new IWorkingSet[]{workingSet});
  				}
  			}
  		}
  		if (foundLRU)
  			// save in new format
  			saveState();
  	}
  	
  	public static String toString(IWorkingSet[] workingSets) {
  		Arrays.sort(workingSets, new WorkingSetComparator());
  		String result= ""; //$NON-NLS-1$
  		if (workingSets != null && workingSets.length > 0) {
  			boolean firstFound= false;
  			for (int i= 0; i < workingSets.length; i++) {
  				String workingSetName= workingSets[i].getLabel();
  				if (firstFound)
  					result= Messages.format(CallHierarchyMessages.SearchUtil_workingSetConcatenation, new String[] {result, workingSetName}); 
  				else {
  					result= workingSetName;
  					firstFound= true;
  				}
  			}
  		}
  		return result;
  	}
  }
  