core/plugins/org.eclipse.dltk.launching/src/org/eclipse/dltk/internal/launching/RuntimeBuildpathProvider.java

/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.launching;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.dltk.launching.IRuntimeBuildpathEntry;
import org.eclipse.dltk.launching.IRuntimeBuildpathProvider;

/**
 * Proxy to a runtime buildpath provider extension.
 */
public class RuntimeBuildpathProvider implements IRuntimeBuildpathProvider {

	private IConfigurationElement fConfigurationElement;

	private IRuntimeBuildpathProvider fDelegate;

	/**
	 * Constructs a new resolver on the given configuration element
	 */
	public RuntimeBuildpathProvider(IConfigurationElement element) {
		fConfigurationElement = element;
	}

	/**
	 * Returns the resolver delegate (and creates if required)
	 */
	protected IRuntimeBuildpathProvider getProvider() throws CoreException {
		if (fDelegate == null) {
			fDelegate = (IRuntimeBuildpathProvider) fConfigurationElement
					.createExecutableExtension("class"); //$NON-NLS-1$
		}
		return fDelegate;
	}

	public String getIdentifier() {
		return fConfigurationElement.getAttribute("id"); //$NON-NLS-1$
	}

	/**
	 * @see IRuntimeBuildpathProvider#computeUnresolvedBuildpath(ILaunchConfiguration)
	 */
	@Override
	public IRuntimeBuildpathEntry[] computeUnresolvedBuildpath(
			ILaunchConfiguration configuration) throws CoreException {
		return getProvider().computeUnresolvedBuildpath(configuration);
	}

	/**
	 * @see IRuntimeBuildpathProvider#resolveBuildpath(IRuntimeBuildpathEntry[],
	 *      ILaunchConfiguration)
	 */
	@Override
	public IRuntimeBuildpathEntry[] resolveBuildpath(
			IRuntimeBuildpathEntry[] entries,
			ILaunchConfiguration configuration) throws CoreException {
		return getProvider().resolveBuildpath(entries, configuration);
	}

}