org.eclipse.debug.core/core/org/eclipse/debug/internal/core/LaunchConfigurationType.java

package org.eclipse.debug.internal.core;

/**********************************************************************
Copyright (c) 2000, 2002 IBM Corp.  All rights reserved.
This file is made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html
**********************************************************************/
 
import java.text.MessageFormat;
import java.util.HashSet;
import java.util.Set;
import java.util.StringTokenizer;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.PlatformObject;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.ILaunchConfigurationType;
import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
import org.eclipse.debug.core.model.ILaunchConfigurationDelegate;

/**
 * A launch configuration type wrappers a configuration
 * element for a <code>launchConfigurationType</code>
 * extension.
 */
public class LaunchConfigurationType extends PlatformObject implements ILaunchConfigurationType {
	
	/**
	 * The configuration element of the extension.
	 */
	private IConfigurationElement fElement;
	
	/**
	 * Modes this type supports.
	 */
	private Set fModes;
	
	/**
	 * The delegate for launch configurations of this type.
	 * Delegates are instantiated lazily as required.
	 */
	private ILaunchConfigurationDelegate fDelegate;
	
	/**
	 * Constructs a new launch configuration type on the
	 * given configuration element.
	 * 
	 * @param element configuration element
	 */
	protected LaunchConfigurationType(IConfigurationElement element) {
		setConfigurationElement(element);
	}
	
	/**
	 * Sets this type's configuration element.
	 * 
	 * @param element this type's configuration element
	 */
	private void setConfigurationElement(IConfigurationElement element) {
		fElement = element;
	}
	
	/**
	 * Returns this type's configuration element.
	 * 
	 * @return this type's configuration element
	 */
	protected IConfigurationElement getConfigurationElement() {
		return fElement;
	}	


	/**
	 * @see ILaunchConfigurationType#supportsMode(String)
	 */
	public boolean supportsMode(String mode) {
		return getModes().contains(mode);
	}

	/**
	 * Returns the set of modes specified in the configuration data.
	 * 
	 * @return the set of modes specified in the configuration data
	 */
	protected Set getModes() {
		if (fModes == null) {
			String modes= getConfigurationElement().getAttribute("modes"); //$NON-NLS-1$
			if (modes == null) {
				return new HashSet(0);
			}
			StringTokenizer tokenizer= new StringTokenizer(modes, ","); //$NON-NLS-1$
			fModes = new HashSet(tokenizer.countTokens());
			while (tokenizer.hasMoreTokens()) {
				fModes.add(tokenizer.nextToken().trim());
			}
		}
		return fModes;
	}
	
	/**
	 * @see ILaunchConfigurationType#getName()
	 */
	public String getName() {
		return getConfigurationElement().getAttribute("name"); //$NON-NLS-1$
	}

	/**
	 * @see ILaunchConfigurationType#getIdentifier()
	 */
	public String getIdentifier() {
		return getConfigurationElement().getAttribute("id"); //$NON-NLS-1$
	}

	/**
	 * @see ILaunchConfigurationType#getCategory()
	 */
	public String getCategory() {
		return getConfigurationElement().getAttribute("category"); //$NON-NLS-1$
	}
	
	/**
	 * @see ILaunchConfigurationType#getAttribute(String)
	 */
	public String getAttribute(String attributeName) {
		return getConfigurationElement().getAttribute(attributeName);
	}	
	
	/**
	 * @see ILaunchConfigurationType#isPublic()
	 */
	public boolean isPublic() {
		String publicString = getConfigurationElement().getAttribute("public"); //$NON-NLS-1$
		if (publicString != null) {
			if (publicString.equalsIgnoreCase("false")) { //$NON-NLS-1$
				return false;
			}
		} 
		return true;
	}

	/**
	 * @see ILaunchConfigurationType#newInstance(IContainer, String)
	 */
	public ILaunchConfigurationWorkingCopy newInstance(
		IContainer container,
		String name)
		throws CoreException {
			return new LaunchConfigurationWorkingCopy(container, name, this);
	}
	
	/**
	 * Returns the launch configuration delegate for launch
	 * configurations of this type. The first time this method
	 * is called, the delegate is instantiated.
	 * 
	 * @return launch configuration delegate
	 * @exception CoreException if unable to instantiate the
	 *  delegate
	 */
	public ILaunchConfigurationDelegate getDelegate() throws CoreException {
		if (fDelegate == null) {
			Object delegate = getConfigurationElement().createExecutableExtension("delegate"); //$NON-NLS-1$
			if (delegate instanceof ILaunchConfigurationDelegate) {
				fDelegate = (ILaunchConfigurationDelegate)delegate;
			} else {
				throw new CoreException(new Status(IStatus.ERROR, DebugPlugin.getUniqueIdentifier(), DebugPlugin.INTERNAL_ERROR, MessageFormat.format(DebugCoreMessages.getString("LaunchConfigurationType.Launch_delegate_for_{0}_does_not_implement_required_interface_ILaunchConfigurationDelegate._1"), new String[]{getName()}), null)); //$NON-NLS-1$
			}
		}
		return fDelegate;
	}

}