/*******************************************************************************
* Copyright (c) 2007, 2008 Symbian 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:
* Andrew Ferguson (Symbian) - Initial implementation
* Markus Schorn (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.core.index.provider;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.index.IIndexLocationConverter;
import org.eclipse.cdt.core.model.LanguageManager;
import org.eclipse.cdt.internal.core.pdom.PDOM;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
/**
* Internal singleton map maintained for non-project PDOM objects
*/
class PDOMCache {
private Map<File, PDOM> path2pdom; // gives the PDOM for a particular path
private static PDOMCache singleton;
private static Object singletonMutex = new Object();
private PDOMCache() {
this.path2pdom = new HashMap<File, PDOM>();
}
/**
* Returns the instance of the cache
*/
public static PDOMCache getInstance() {
synchronized (singletonMutex) {
if (singleton == null) {
singleton = new PDOMCache();
}
return singleton;
}
}
/**
* Returns the mapped PDOM for the path specified, if such a pdom is not already known about
* then one is created using the location converter specified.
* @param path
* @param converter
* @return a PDOM instance or null if the PDOM version was too old
*/
public PDOM getPDOM(IPath path, IIndexLocationConverter converter) {
if (path == null){
return null;
}
PDOM result= null;
File file = path.toFile();
synchronized (path2pdom) {
if (path2pdom.containsKey(file)) {
result= path2pdom.get(file);
}
if (result == null) {
try {
result= new PDOM(file, converter, LanguageManager.getInstance().getPDOMLinkageFactoryMappings());
path2pdom.put(file, result);
} catch (CoreException ce) {
CCorePlugin.log(ce);
}
}
}
return result;
}
}