/*******************************************************************************
* 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.elementedit;
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.pagedesigner.IJMTConstants;
import org.eclipse.jst.pagedesigner.PDPlugin;
import org.eclipse.jst.pagedesigner.PageDesignerTraceOptions;
/**
* @author mengbo
* @version 1.5
*/
public class ElementEditFacRegistryReader {
private static List<IElementEditFactory> _handlers = null;
/**
* @return all available handers for the ext-pt. List is not
* modifiable
*/
public static synchronized List<IElementEditFactory> getAllHandlers() {
if (_handlers == null) {
_handlers = readAllHandlers();
}
return Collections.unmodifiableList(_handlers);
}
private static List<IElementEditFactory> readAllHandlers()
{
List<IElementEditFactory> result = new ArrayList<IElementEditFactory>();
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[] elementEditElement = ext
.getConfigurationElements();
for (int j = 0; j < elementEditElement.length; j++)
{
final IConfigurationElement element = elementEditElement[j];
if (element.getName().equals(
IJMTConstants.ELEMENT_EDIT_FACTORY))
{
elementEditElement[j].getAttribute("class"); //$NON-NLS-1$
Object obj;
try
{
obj = elementEditElement[j]
.createExecutableExtension("class"); //$NON-NLS-1$
// TODO: we need a policy based solution here,
// but this will do for now
if (obj instanceof IElementEditFactory)
{
if (element.getContributor().getName().startsWith("org.eclipse.jst")) //$NON-NLS-1$
{
if (PageDesignerTraceOptions.TRACE_ELEMENTEDITLOAD)
{
PageDesignerTraceOptions.log("ElementEditFacRegistryReader: Appending to list:"+obj.getClass().getName()); //$NON-NLS-1$
}
// push JSF tools provided ones to the end
result.add((IElementEditFactory) obj);
}
// prepend if something outside JSF tools declared it
else
{
if (PageDesignerTraceOptions.TRACE_ELEMENTEDITLOAD)
{
PageDesignerTraceOptions.log("ElementEditFacRegistryReader: Prepending to list:"+obj.getClass().getName()); //$NON-NLS-1$
}
// this way, adopters can put their overrides
// of factories with built-in support like
// JSF HTML/CORE will be used first
result.add(0, (IElementEditFactory) obj);
}
}
} catch (CoreException e)
{
PDPlugin.log("Problem loading element edit extension for "+element.toString(), e); //$NON-NLS-1$
}
}
}
}
if (PageDesignerTraceOptions.TRACE_ELEMENTEDITLOAD)
{
PageDesignerTraceOptions.log("\nFinal elementEditFactory list in order:"); //$NON-NLS-1$
for (final IElementEditFactory factory : result)
{
PageDesignerTraceOptions.log(factory.getClass().getName());
}
PageDesignerTraceOptions.log("\n"); //$NON-NLS-1$
}
return result;
}
}