/*******************************************************************************
* Copyright (c) 2006 Sybase, Inc. 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:
* Sybase, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.actions.link;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jst.jsf.common.ui.internal.logging.Logger;
import org.eclipse.jst.pagedesigner.IJMTConstants;
import org.eclipse.jst.pagedesigner.PDPlugin;
/**
* @author mengbo
* @version 1.5
*/
public class ExtensionReader {
private static Logger _log = PDPlugin.getLogger(ExtensionReader.class);
private static List<ILinkCreator> _handlers = null;
private static final String ATTR_CLASS = "class"; //$NON-NLS-1$
/**
* @return the ext-pts for the link handler
* List is not modifiable
*/
public static synchronized List<ILinkCreator> getAllLinkHandlers() {
if (_handlers == null) {
_handlers = readAllLinkHandlers();
}
return Collections.unmodifiableList(_handlers);
}
private static List<ILinkCreator> readAllLinkHandlers() {
List<ILinkCreator> result = new ArrayList<ILinkCreator>();
IExtensionPoint extensionPoint = Platform.getExtensionRegistry()
.getExtensionPoint(PDPlugin.getPluginId(),
IJMTConstants.EXTENSION_POINT_PAGEDESIGNER);
IExtension[] extensions = extensionPoint.getExtensions();
for (int i = 0; i < extensions.length; i++) {
IExtension ext = extensions[i];
IConfigurationElement[] linkHandlers = ext
.getConfigurationElements();
for (int j = 0; j < linkHandlers.length; j++) {
if (linkHandlers[j].getName()
.equals(IJMTConstants.LINK_CREATOR)) {
linkHandlers[j].getAttribute(ATTR_CLASS);
Object obj;
try {
obj = linkHandlers[j]
.createExecutableExtension(ATTR_CLASS);
if (obj instanceof ILinkCreator) {
result.add((ILinkCreator)obj);
}
} catch (CoreException e) {
_log
.error("Log.Error.ExtensionReader.ReadLinkExtension"); //$NON-NLS-1$
}
}
}
}
return result;
}
}