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/*******************************************************************************
* Copyright (c) 2013 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 Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.compare.internal;
import java.net.URL;
import java.util.Enumeration;
import java.util.ResourceBundle;
import org.eclipse.compare.ICompareFilter;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.resource.ImageDescriptor;
import org.osgi.framework.Bundle;
/**
* Describes compare filter extension.
*/
public class CompareFilterDescriptor {
private final static String CLASS_ATTRIBUTE = "class"; //$NON-NLS-1$
private final static String ID_ATTRIBUTE = "id"; //$NON-NLS-1$
private final static String DEFINITION_ID_ATTRIBUTE = "definitionId"; //$NON-NLS-1$
private final static String FILTER_IMAGE_ATTRIBUTE = "filter.image"; //$NON-NLS-1$
private IConfigurationElement fConfiguration;
private ResourceBundle fResourceBundle;
private ImageDescriptor fImageDescriptor;
private class ConfigurationKeysEnumeration implements Enumeration {
private String[] keySet;
private int cursor = 0;
public ConfigurationKeysEnumeration(IConfigurationElement configuration) {
super();
this.keySet = configuration.getAttributeNames();
}
@Override
public boolean hasMoreElements() {
return cursor >= keySet.length;
}
@Override
public Object nextElement() {
return keySet[cursor++];
}
}
public CompareFilterDescriptor(IConfigurationElement config) {
fConfiguration = config;
fResourceBundle = new ResourceBundle() {
@Override
protected Object handleGetObject(String key) {
return fConfiguration.getAttribute(key);
}
@Override
public Enumeration getKeys() {
return new ConfigurationKeysEnumeration(fConfiguration);
}
};
URL url = null;
String pluginId = fConfiguration.getContributor().getName();
Bundle bundle = Platform.getBundle(pluginId);
if (bundle != null) {
String path = Utilities.getString(fResourceBundle,
FILTER_IMAGE_ATTRIBUTE, FILTER_IMAGE_ATTRIBUTE);
if (path != null)
url = FileLocator.find(bundle, new Path(path), null);
}
fImageDescriptor = (url == null) ? null : ImageDescriptor
.createFromURL(url);
}
public ICompareFilter createCompareFilter() {
try {
return (ICompareFilter) fConfiguration
.createExecutableExtension(CLASS_ATTRIBUTE);
} catch (CoreException e) {
CompareUIPlugin.log(e);
}
return null;
}
public String getFilterId() {
return fConfiguration.getAttribute(ID_ATTRIBUTE);
}
public String getDefinitionId() {
return fConfiguration.getAttribute(DEFINITION_ID_ATTRIBUTE);
}
public ResourceBundle getResourceBundle() {
return fResourceBundle;
}
public ImageDescriptor getImageDescriptor() {
return fImageDescriptor;
}
}
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