/**
* <copyright>
*
* Copyright (c) 2007 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 - Initial API and implementation
*
* </copyright>
*
* $Id: ContentHandlerRegistryReader.java,v 1.1 2007/09/29 16:41:42 emerks Exp $
*/
package org.eclipse.emf.ecore.plugin;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.ecore.resource.ContentHandler;
/**
* A plugin extension reader that populates the
* {@link org.eclipse.emf.ecore.resource.Resource.Factory.Registry#INSTANCE global} resource factory's
* {@link org.eclipse.emf.ecore.resource.Resource.Factory.Registry#getContentTypeToFactoryMap() content type} map.
* Clients are not expected to use this class directly.
*/
class ContentHandlerRegistryReader extends RegistryReader
{
static final String TAG_HANDLER = "contentHandler";
static final String ATT_CLASS = "class";
static final String ATT_PRIORITY = "priority";
public ContentHandlerRegistryReader()
{
super
(Platform.getExtensionRegistry(),
EcorePlugin.getPlugin().getBundle().getSymbolicName(),
EcorePlugin.CONTENT_HANDLER_PPID);
}
private static final Map<String, List<ContentHandler>> CONTRIBUTION_MAP = new HashMap<String, List<ContentHandler>>();
@Override
protected boolean readElement(IConfigurationElement element, boolean add)
{
if (element.getName().equals(TAG_HANDLER))
{
int priority = 0;
if (element.getAttribute(ATT_PRIORITY) != null)
{
priority = Integer.parseInt(element.getAttribute(ATT_PRIORITY));
}
String contributorClassName = element.getAttribute(ATT_CLASS);
if (contributorClassName == null)
{
logMissingAttribute(element, ATT_CLASS);
}
else
{
String contributorName = element.getContributor().getName();
if (add)
{
try
{
@SuppressWarnings("unchecked")
Class<ContentHandler> contributorHandlerClass = Platform.getBundle(element.getNamespaceIdentifier()).loadClass(contributorClassName);
Map<String, String> parameters = new HashMap<String, String>();
for (IConfigurationElement parameter : element.getChildren("parameter"))
{
parameters.put(parameter.getAttribute("name"), parameter.getAttribute("value"));
}
ContentHandler contentHandler =
parameters.isEmpty() ?
contributorHandlerClass.newInstance() :
contributorHandlerClass.getConstructor(Map.class).newInstance(parameters);
ContentHandler.Registry.INSTANCE.put(priority, contentHandler);
List<ContentHandler> contributions = CONTRIBUTION_MAP.get(contributorName);
if (contributions == null)
{
CONTRIBUTION_MAP.put(contributorName, contributions = new ArrayList<ContentHandler>());
}
contributions.add(contentHandler);
}
catch (Exception exception)
{
EcorePlugin.INSTANCE.log(exception);
}
return true;
}
else
{
List<ContentHandler> contributions = CONTRIBUTION_MAP.get(contributorName);
if (contributions != null)
{
for (List<ContentHandler> values : ContentHandler.Registry.INSTANCE.values())
{
values.removeAll(contributions);
}
}
CONTRIBUTION_MAP.remove(contributorName);
return true;
}
}
}
else if (element.getName().equals("parameter"))
{
return true;
}
return false;
}
}