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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.HashMap;
import java.util.Map;
/**
* Registry for storing and retrieving value decoders and encoders. 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 EncoderDecoderRegistry {
protected static EncoderDecoderRegistry _defaultInstance;
public static final EncoderDecoder INITIAL_DEFAULT_ENCODER = PassthruEncoderDecoder.INSTANCE;
protected Map encoders = new HashMap();
protected Object defaultEncoderKey;
/**
* EncoderDecoderRegistry constructor comment.
*/
public EncoderDecoderRegistry() {
super();
initializeDefaultEncoders();
}
/**
* Insert the method's description here. Creation date: (2/2/2001 12:43:31 AM)
*/
public void addEncoderDecoder(EncoderDecoder encoderDecoder) {
encoders.put(encoderDecoder.getClass().getName(), encoderDecoder);
if (defaultEncoderKey == null)
defaultEncoderKey = encoderDecoder.getClass().getName();
}
/**
* Returns an encoder/decoder by key.
*/
public EncoderDecoder getDefaultEncoderDecoder() {
if (defaultEncoderKey == null)
return null;
return (EncoderDecoder) encoders.get(defaultEncoderKey);
}
/**
* Returns the default registry to use for retrieving value encoders and decoders
*/
public static EncoderDecoderRegistry getDefaultRegistry() {
if (_defaultInstance == null) {
_defaultInstance = new EncoderDecoderRegistry();
}
return _defaultInstance;
}
/**
* Returns an encoder/decoder by key.
*/
public EncoderDecoder getEncoderDecoder(Object key) {
return (EncoderDecoder) encoders.get(key);
}
/**
* Initializes a standard set of encoder/decoders.
*/
public void initializeDefaultEncoders() {
setDefaultEncoderDecoder(INITIAL_DEFAULT_ENCODER);
addEncoderDecoder(new XMLValueEncoderDecoder());
}
/**
* Removes the encoder/decoder with the specified key.
*/
public void removeEncoderDecoder(Object key) {
if (encoders.containsKey(key)) {
encoders.remove(key);
}
}
/**
* Returns an encoder/decoder by key.
*/
public void setDefaultEncoderDecoder(EncoderDecoder encoder) {
defaultEncoderKey = encoder.getClass().getName();
if (!encoders.containsKey(defaultEncoderKey)) {
addEncoderDecoder(encoder);
}
}
}
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