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/*******************************************************************************
* Copyright (c) 2000, 2006 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.ui.internal.console;
import java.net.URL;
import org.eclipse.core.expressions.EvaluationContext;
import org.eclipse.core.expressions.EvaluationResult;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.expressions.ExpressionConverter;
import org.eclipse.core.expressions.ExpressionTagNames;
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.eclipse.ui.IPluginContribution;
import org.eclipse.ui.console.ConsolePlugin;
import org.eclipse.ui.console.IConsoleFactory;
import org.osgi.framework.Bundle;
/**
* @since 3.1
*/
public class ConsoleFactoryExtension implements IPluginContribution {
private IConfigurationElement fConfig;
private Expression fEnablementExpression;
private String fLabel;
private ImageDescriptor fImageDescriptor;
private IConsoleFactory fFactory;
ConsoleFactoryExtension(IConfigurationElement config) {
fConfig = config;
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPluginContribution#getLocalId()
*/
public String getLocalId() {
return fConfig.getAttribute("id"); //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPluginContribution#getPluginId()
*/
public String getPluginId() {
return fConfig.getContributor().getName();
}
public boolean isEnabled() {
try {
Expression enablementExpression = getEnablementExpression();
if (enablementExpression == null) {
return true;
}
EvaluationContext context = new EvaluationContext(null, this);
EvaluationResult evaluationResult = enablementExpression.evaluate(context);
return evaluationResult != EvaluationResult.FALSE;
} catch (CoreException e) {
ConsolePlugin.log(e);
return false;
}
}
public Expression getEnablementExpression() throws CoreException {
if (fEnablementExpression == null) {
IConfigurationElement[] elements = fConfig.getChildren(ExpressionTagNames.ENABLEMENT);
IConfigurationElement enablement = elements.length > 0 ? elements[0] : null;
if (enablement != null) {
fEnablementExpression = ExpressionConverter.getDefault().perform(enablement);
}
}
return fEnablementExpression;
}
public String getLabel() {
if (fLabel == null) {
fLabel = fConfig.getAttribute("label"); //$NON-NLS-1$
}
return fLabel;
}
/**
* @return
*/
public ImageDescriptor getImageDescriptor() {
if (fImageDescriptor == null) {
String path = fConfig.getAttribute("icon"); //$NON-NLS-1$
if (path != null) {
Bundle bundle = Platform.getBundle(getPluginId());
URL url = FileLocator.find(bundle, new Path(path), null);
if (url != null) {
fImageDescriptor = ImageDescriptor.createFromURL(url);
}
}
}
return fImageDescriptor;
}
/**
* @return
* @throws CoreException
*/
public IConsoleFactory createFactory() throws CoreException {
if (fFactory == null) {
fFactory = (IConsoleFactory) fConfig.createExecutableExtension("class"); //$NON-NLS-1$
}
return fFactory;
}
}
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