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/*******************************************************************************
* Copyright (c) 2003, 2004 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.wst.common.internal.emf.utilities;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
/**
* @deprecated This class will be deleted. If you still need to use this class, please contact the
* WCCM team. A class which can be used in conjunction with Encoder/Decoders to save
* resources if they are made dirty by automatic encoding support. Usage Example:
*
* <pre>
*
*
* // Use the standard WebSphere password value encoder/decoder.
* EncoderDecoderRegistry.getDefaultRegistry().setDefaultEncoderDecoder(new com.ibm.ejs.security.util.WASEncoderDecoder());
* // Begin tracking changes...
* WriteBackHelper.begin();
* // Load a resource which may have un-encoded values...
* // Note: The WCCM will attempt to detect un-encoded values. If unencoded values
* // are found, the value will be encoded, and the resource will be added to the
* // WriteBackHelper.
* Resource res = resourceSet.load("myResource");
* // Ensure that any changes due to encoding are written back out.
* WriteBackHelper.end();
* </pre>
*/
public class WriteBackHelper {
private Set dirtyObjects = new HashSet();
private boolean trackingChanges = false;
private static WriteBackHelper _instance;
static {
//Deprecated class
Revisit.deleteMe();
}
/**
* Private constructor ensures proper usage through singleton.
*/
private WriteBackHelper() {
super();
}
/**
* Adds a resource which is dirty, and needs to be saved.
*/
public void addDirtyObject(EObject dirtyObject) {
dirtyObjects.add(dirtyObject);
}
/**
* Begin collecting objects which have changed.
*/
public void begin() {
trackingChanges = true;
}
/**
* Attempts to save all dirty resources (if possible), then marks the resources as non-dirty.
*/
public void end() {
saveDirtyResources();
reset();
trackingChanges = false;
}
/**
* Returns true if changes to mof objects are currently being tracked.
*/
public boolean isActive() {
return trackingChanges;
}
/**
* Clears the list of dirty resources.
*/
protected void reset() {
dirtyObjects.clear();
}
/**
* Attempts to save all dirty resources (if possible), then marks the resources as non-dirty.
*/
protected void saveDirtyResources() {
Set dirtyResources = new HashSet();
Iterator dirtyObjIter = dirtyObjects.iterator();
while (dirtyObjIter.hasNext()) {
EObject dirtyObject = (EObject) dirtyObjIter.next();
if (dirtyObject.eResource() != null && !dirtyResources.contains(dirtyObject)) {
dirtyResources.add(dirtyObject.eResource());
}
}
Iterator dirtyIter = dirtyResources.iterator();
while (dirtyIter.hasNext()) {
Resource dirtyResource = (Resource) dirtyIter.next();
try {
dirtyResource.save(Collections.EMPTY_MAP);
} catch (Exception e) {
warn(dirtyResource, e);
}
}
}
/**
* Adds a resource which is dirty, and needs to be saved.
*/
public static WriteBackHelper singleton() {
if (_instance == null) {
_instance = new WriteBackHelper();
}
return _instance;
}
/**
* Warn the user of problems during save.
*/
protected void warn(Resource res, Exception e) {
System.err.println(WFTUtilsResourceHandler.getString(WFTUtilsResourceHandler.Warning__Could_not_write_b_WARN_, new Object[]{res.getURI()})); //$NON-NLS-1$
}
}
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