org.eclipse.emf.mwe.ui.workflow.util.ProjectIncludingResourceLoader.java Source code

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Here is the source code for org.eclipse.emf.mwe.ui.workflow.util.ProjectIncludingResourceLoader.java

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/*******************************************************************************
 * Copyright (c) 2005, 2009 committers of openArchitectureWare 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:
 *     committers of openArchitectureWare - initial API and implementation
 *******************************************************************************/
package org.eclipse.emf.mwe.ui.workflow.util;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.emf.mwe.core.resources.ResourceLoaderDefaultImpl;
import org.eclipse.emf.mwe.internal.ui.workflow.Activator;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;

/**
 * This ResourceLoader is capable of loading resources from a specific Java project within the workspace.
 * Typical use is when invoking a workflow from within a plugin.
 * 
 * FIXME: Refactor this class to repect the EMFPlugin
 */
public class ProjectIncludingResourceLoader extends ResourceLoaderDefaultImpl {
    private final ClassLoader projectCL;

    public ProjectIncludingResourceLoader(final IProject project) throws CoreException {
        super();
        projectCL = createClassLoader(project);
    }

    /**
     * Builds a classloader for a Java project from the workspace.
     * @param project An Eclipse project
     * @throws CoreException
     */
    public ClassLoader createClassLoader(final IProject project) throws CoreException {
        IJavaProject jp = JavaCore.create(project);

        //      IClasspathEntry[] javacp = jp.getResolvedClasspath(true);
        IPackageFragmentRoot[] roots = jp.getAllPackageFragmentRoots();
        URL[] urls = new URL[roots.length];

        IPath wsLocation = ResourcesPlugin.getWorkspace().getRoot().getLocation();
        for (int i = 0; i < roots.length; i++) {
            try {
                IPath path = roots[i].getPath();
                File file = path.toFile();
                if (!file.exists()) {
                    path = wsLocation.append(path);
                    file = path.toFile();
                }
                URL url = file.toURL();
                urls[i] = url;
            } catch (MalformedURLException e) {
                Activator.logError(e);
            }
        }
        return new URLClassLoader(urls);
    }

    @Override
    protected URL loadFromContextClassLoader(final String path) {
        URL resource = projectCL.getResource(path);
        if (resource == null) {
            resource = super.loadFromContextClassLoader(path);
        }
        return resource;
    }

}