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/***************************************************************************
* Copyright (c) 2004-2006 Eike Stepper, Fuggerstr. 39, 10777 Berlin, Germany.
* 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:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.util.eclipse;
import org.eclipse.net4j.util.ImplementationError;
import org.eclipse.net4j.util.StringHelper;
import org.eclipse.net4j.util.eclipse.Element.Factory;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.apache.log4j.Logger;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ExtensionParser
{
protected Map<Pattern, Factory> elementDataFactoryRegistry = new HashMap<Pattern, Factory>();
protected List<String> contextStack = new ArrayList<String>();
private static final Logger logger = Logger.getLogger(ExtensionParser.class.getName());
public void parse(String extPointId)
{
IExtensionRegistry registry = Platform.getExtensionRegistry();
IExtensionPoint point = registry.getExtensionPoint(extPointId);
if (point == null)
{
String msg = "Extension point '" + extPointId + "' does not exist.";
logger.error(msg);
return;
}
parse(point);
}
public void parse(IExtensionPoint point)
{
IExtension[] extensions = point.getExtensions();
for (int i = 0; extensions != null && i < extensions.length; i++)
{
try
{
parse(extensions[i]);
}
catch (Throwable t)
{
String msg = "Error in plugin " + extensions[i].getNamespaceIdentifier()
+ " while reading extension to " + point.getUniqueIdentifier();
logger.error(msg, t);
}
}
}
public Element[] parse(IExtension extension)
{
if (logger.isDebugEnabled())
logger.debug("Parsing plugin " + extension.getNamespaceIdentifier() + " (extension-point = "
+ extension.getExtensionPointUniqueIdentifier() + ")");
IConfigurationElement[] elems = extension.getConfigurationElements();
return parse(elems);
}
public Element[] parse(IConfigurationElement[] elems)
{
Element[] result = new Element[elems.length];
for (int i = 0; i < elems.length; i++)
{
IConfigurationElement elem = elems[i];
result[i] = parse(elem);
}
if (logger.isDebugEnabled())
logger.debug("All extension data: " + StringHelper.implode(result, ", "));
return result;
}
public Element parse(IConfigurationElement elem)
{
pushContext(elem.getName());
String context = getContextString();
Element.Factory factory = findFactory(context);
if (factory == null)
throw new ExtensionConfigException("No element factory for context " + context);
Element elementData = factory.createElementData();
if (elementData == null)
throw new ExtensionConfigException("No element created for context " + context);
elementData.internalSetConfigurationElement(elem);
String[] attributeNames = elem.getAttributeNames();
for (int i = 0; i < attributeNames.length; i++)
{
String attributeName = attributeNames[i];
String attributeValue = elem.getAttribute(attributeName);
if (logger.isDebugEnabled())
logger.debug("Dispatching " + context + "." + attributeName + " = " + attributeValue);
elementData.dispatchAttributeValue(attributeName, attributeValue);
}
// Recurse
for (int i = 0; i < elem.getChildren().length; i++)
{
IConfigurationElement child = elem.getChildren()[i];
Element childData = parse(child);
elementData.dispatchChild(child.getName(), childData);
}
popContext();
validate(elementData);
return elementData;
}
public void addFactory(String contextPattern, Factory factory)
{
Pattern pattern = Pattern.compile(contextPattern);
elementDataFactoryRegistry.put(pattern, factory);
}
public Factory findFactory(String context)
{
for (Map.Entry<Pattern, Factory> entry : elementDataFactoryRegistry.entrySet())
{
Pattern pattern = entry.getKey();
Matcher matcher = pattern.matcher(context);
if (matcher.matches())
{
return entry.getValue();
}
}
return null;
}
protected void pushContext(String elementName)
{
contextStack.add(elementName);
}
protected String popContext()
{
if (contextStack.isEmpty()) throw new ImplementationError("contextStack is empty");
return contextStack.remove(contextStack.size() - 1);
}
protected String getContextString()
{
return StringHelper.implode(contextStack, "/");
}
protected void validate(Element elementData)
{
elementData.validate(this);
}
}
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