/*******************************************************************************
* Copyright (c) 2001, 2008 Oracle 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:
* Oracle Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsf.core.internal;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
/**
* Loads and caches extension for the tagRegistry extension point.
*
* @author cbateman
*
*/
/* package */class TagLibraryRegistryLoader
{
private final static String EXTENSION_ID = "tagregistry"; //$NON-NLS-1$
private final static String ELEMENT_NAME = "tagRegistry"; //$NON-NLS-1$
private static Set<ITagRegistryFactoryInfo> _extensions;
/**
* @return the list of handlers. The list is not modifiable and will throw
* exceptions if it is attempted.
*/
public static synchronized Set<ITagRegistryFactoryInfo> getAllHandlers()
{
if (_extensions == null)
{
_extensions = readAllHandlers();
}
return Collections.unmodifiableSet(_extensions);
}
private static Set<ITagRegistryFactoryInfo> readAllHandlers()
{
Set<ITagRegistryFactoryInfo> result = new HashSet<ITagRegistryFactoryInfo>();
IExtensionPoint extensionPoint = JSFCorePlugin.getDefault()
.getExtension(EXTENSION_ID);
IExtension[] extensions = extensionPoint.getExtensions();
for (int i = 0; i < extensions.length; i++)
{
IExtension ext = extensions[i];
IConfigurationElement[] configElements = ext
.getConfigurationElements();
for (int j = 0; j < configElements.length; j++)
{
final IConfigurationElement element = configElements[j];
if (ELEMENT_NAME.equals(element.getName()))
{
try
{
final TagRegistryFactoryInfo extension = new TagRegistryFactoryInfo(
element);
result.add(extension);
}
catch (CoreException e)
{
JSFCorePlugin.log(e,
"Error loading tag registry extension: " //$NON-NLS-1$
+ element.getContributor().getName()
+ "." + element.getAttribute("id")); //$NON-NLS-1$ //$NON-NLS-2$
}
}
}
}
return result;
}
}