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/*******************************************************************************
* Copyright (c) 2000, 2006 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.core.internal.registry;
import java.lang.ref.SoftReference;
/**
* An object which represents the user-defined extension in a plug-in manifest.
*/
public class Extension extends RegistryObject {
public static final Extension[] EMPTY_ARRAY = new Extension[0];
//Extension simple identifier
private String simpleId;
//The namespace for the extension.
private String namespaceName;
// Place holder for the label and the extension point. It contains either a String[] or a SoftReference to a String[].
//The array layout is [label, extension point name]
private Object extraInformation;
private static final byte LABEL = 0; //The human readable name of the extension
private static final byte XPT_NAME = 1; // The fully qualified name of the extension point to which this extension is attached to
private static final int EXTRA_SIZE = 2;
protected Extension(ExtensionRegistry registry, boolean persist) {
super(registry, persist);
}
protected Extension(int self, String simpleId, String namespace, int[] children, int extraData, ExtensionRegistry registry, boolean persist) {
super(registry, persist);
setObjectId(self);
this.simpleId = simpleId;
setRawChildren(children);
setExtraDataOffset(extraData);
this.namespaceName = namespace;
}
protected String getExtensionPointIdentifier() {
return getExtraData()[XPT_NAME];
}
protected String getSimpleIdentifier() {
return simpleId;
}
protected String getUniqueIdentifier() {
return simpleId == null ? null : this.getNamespaceName() + '.' + simpleId;
}
void setExtensionPointIdentifier(String value) {
ensureExtraInformationType();
((String[]) extraInformation)[XPT_NAME] = value;
}
void setSimpleIdentifier(String value) {
simpleId = value;
}
private String[] getExtraData() {
//The extension has been created by parsing, or does not have any extra data
if (noExtraData()) {
if (extraInformation != null)
return (String[]) extraInformation;
return null;
}
//The extension has been loaded from the cache.
String[] result = null;
if (extraInformation == null || (result = ((extraInformation instanceof SoftReference) ? (String[]) ((SoftReference) extraInformation).get() : (String[]) extraInformation)) == null) {
result = registry.getTableReader().loadExtensionExtraData(getExtraDataOffset());
extraInformation = new SoftReference(result);
}
return result;
}
String getLabel() {
String s = getExtraData()[LABEL];
if (s == null)
return ""; //$NON-NLS-1$
return s;
}
void setLabel(String value) {
ensureExtraInformationType();
((String[]) extraInformation)[LABEL] = value;
}
public String getNamespaceName() {
return namespaceName;
}
void setNamespaceName(String value) {
namespaceName = value;
}
public String toString() {
return getUniqueIdentifier() + " -> " + getExtensionPointIdentifier(); //$NON-NLS-1$
}
/**
* At the end of this method, extra information will be a string[]
*/
private void ensureExtraInformationType() {
if (extraInformation instanceof SoftReference) {
extraInformation = ((SoftReference) extraInformation).get();
}
if (extraInformation == null) {
extraInformation = new String[EXTRA_SIZE];
}
}
}
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