Copyright (c) 2010, 2018 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2010, 2018 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.launching;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.variables.IDynamicVariable;
import org.eclipse.core.variables.IDynamicVariableResolver;
import org.eclipse.core.variables.IStringVariableManager;
import org.eclipse.core.variables.VariablesPlugin;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.launching.IRuntimeClasspathEntry;
import org.eclipse.jdt.launching.IRuntimeClasspathEntry2;
import org.eclipse.jdt.launching.JavaRuntime;
import org.eclipse.osgi.util.NLS;

Resolver for ${project_classpath:}. Returns a string corresponding to the
class path of the corresponding Java project.
/**
 * Resolver for ${project_classpath:<project_name>}. Returns a string corresponding to the
 * class path of the corresponding Java project.
 */
public class ProjectClasspathVariableResolver implements IDynamicVariableResolver {

	@Override
	public String resolveValue(IDynamicVariable variable, String argument) throws CoreException {
		IProject proj = null;
		if (argument == null) {
			IResource resource = getSelectedResource();
			if (resource != null && resource.exists()) {
				proj = resource.getProject();
			}
			if (proj == null) {
				throw new CoreException(new Status(IStatus.ERROR, LaunchingPlugin.ID_PLUGIN, LaunchingMessages.ProjectClasspathVariableResolver_2));
			}
		} else {
			proj = ResourcesPlugin.getWorkspace().getRoot().getProject(argument);
		}
		IJavaProject javaProject = JavaCore.create(proj);
		if (javaProject.exists()) {
			IRuntimeClasspathEntry2 defClassPath = (IRuntimeClasspathEntry2) JavaRuntime.newDefaultProjectClasspathEntry(javaProject);
			IRuntimeClasspathEntry[] entries = defClassPath.getRuntimeClasspathEntries(false);
			List<IRuntimeClasspathEntry> collect = new ArrayList<>();
			for (int i = 0; i < entries.length; i++) {
				IRuntimeClasspathEntry[] children = JavaRuntime.resolveRuntimeClasspathEntry(entries[i], javaProject, false);
				for (int j = 0; j < children.length; j++) {
					collect.add(children[j]);
				}
			}
			entries = collect.toArray(new IRuntimeClasspathEntry[collect.size()]);
			StringBuilder buffer = new StringBuilder();
			for (int i = 0; i < entries.length; i++) {
				if (i > 0) {
					buffer.append(File.pathSeparatorChar);
				}
				buffer.append(entries[i].getLocation());
			}
			return buffer.toString();
		}
		throw new CoreException(new Status(IStatus.ERROR, LaunchingPlugin.ID_PLUGIN, NLS.bind(LaunchingMessages.ProjectClasspathVariableResolver_1, new String[]{argument})));
	}

	
Returns the selected resource. Uses the ${selected_resource_path} variable
to determine the selected resource. This variable is provided by the debug.ui
plug-in. Selected resource resolution is only available when the debug.ui
plug-in is present.
Throws:
CoreException – if there is no selection
Returns:
selected resource/**
	 * Returns the selected resource. Uses the ${selected_resource_path} variable
	 * to determine the selected resource. This variable is provided by the debug.ui
	 * plug-in. Selected resource resolution is only available when the debug.ui
	 * plug-in is present.
	 *
	 * @return selected resource
	 * @throws CoreException if there is no selection
	 */
	protected IResource getSelectedResource() throws CoreException {
		IStringVariableManager manager = VariablesPlugin.getDefault().getStringVariableManager();
		try {
			String pathString = manager.performStringSubstitution("${selected_resource_path}"); //$NON-NLS-1$
			return ResourcesPlugin.getWorkspace().getRoot().findMember(new Path(pathString));
		} catch (CoreException e) {
			// unable to resolve a selection
		}
		throw new CoreException(new Status(IStatus.ERROR, LaunchingPlugin.ID_PLUGIN, LaunchingMessages.ProjectClasspathVariableResolver_3));
	}

}