/*******************************************************************************
* 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.converter;
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 ConverterFacRegistryReader {
private static List<IConverterFactory> _handlers = null;
/**
* @return the list of handlers. The list is not modifiable and will
* throw exceptions if it is attempted.
*/
public static synchronized List<IConverterFactory> getAllHandlers() {
if (_handlers == null) {
_handlers = readAllHandlers();
}
return Collections.unmodifiableList(_handlers);
}
private static List<IConverterFactory> readAllHandlers()
{
final List<IConverterFactory> result = new ArrayList<IConverterFactory>();
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[] tagConverter = ext
.getConfigurationElements();
for (int j = 0; j < tagConverter.length; j++)
{
final IConfigurationElement element = tagConverter[j];
if (element.getName().equals(
IJMTConstants.TAG_CONVERTER_FACTORY))
{
element.getAttribute("class"); //$NON-NLS-1$
Object obj;
try
{
obj = element.createExecutableExtension("class"); //$NON-NLS-1$
if (element.getContributor().getName().startsWith(
"org.eclipse.jst")) //$NON-NLS-1$
{
if (PageDesignerTraceOptions.TRACE_CONVERTERLOAD)
{
PageDesignerTraceOptions.log("ConverterFacRegistryReader: Appending to list:"+obj.getClass().getName()); //$NON-NLS-1$
}
// push JSF tools provided ones to the end
result.add((IConverterFactory) obj);
}
// prepend if something outside JSF tools declared it
else
{
if (PageDesignerTraceOptions.TRACE_CONVERTERLOAD)
{
PageDesignerTraceOptions.log("ConverterFacRegistryReader: 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, (IConverterFactory) obj);
}
}
catch (CoreException e)
{
PDPlugin.log("Problem loading tag converter extension for "+element.toString(), e); //$NON-NLS-1$
}
}
}
}
if (PageDesignerTraceOptions.TRACE_CONVERTERLOAD)
{
PageDesignerTraceOptions.log("\nFinal converterFactory list in order:"); //$NON-NLS-1$
for (final IConverterFactory factory : result)
{
PageDesignerTraceOptions.log(factory.getClass().getName());
}
PageDesignerTraceOptions.log("\n"); //$NON-NLS-1$
}
return result;
}
}