com.google.gdt.eclipse.designer.util.DefaultModuleDescription.java Source code

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Here is the source code for com.google.gdt.eclipse.designer.util.DefaultModuleDescription.java

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/*******************************************************************************
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.google.gdt.eclipse.designer.util;

import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.gdt.eclipse.designer.common.Constants;
import com.google.gdt.eclipse.designer.util.resources.DefaultResourcesProvider;
import com.google.gdt.eclipse.designer.util.resources.IResourcesProvider;

import org.eclipse.wb.internal.core.utils.reflect.ProjectClassLoader;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.JavaCore;

import org.apache.commons.lang.StringUtils;

import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Collections;
import java.util.List;

public class DefaultModuleDescription extends ModuleDescription {
    private final IFile m_file;
    private List<String> m_locations;
    private URL[] m_urls;
    private ClassLoader m_classLoader;

    ////////////////////////////////////////////////////////////////////////////
    //
    // Constructor
    //
    ////////////////////////////////////////////////////////////////////////////
    public DefaultModuleDescription(IFile moduleFile) {
        m_file = moduleFile;
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // Internal access
    //
    ////////////////////////////////////////////////////////////////////////////
    public IFile getFile() {
        return m_file;
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // Access
    //
    ////////////////////////////////////////////////////////////////////////////
    @Override
    public String getId() {
        String simpleName = getSimpleName();
        // try to find parent package (Case 26650)
        IJavaElement parentElement = JavaCore.create(m_file.getParent());
        if (parentElement instanceof IPackageFragment) {
            IPackageFragment pkg = (IPackageFragment) parentElement;
            return pkg.getElementName() + "." + simpleName;
        }
        // use simple name
        return simpleName;
    }

    @Override
    public String getSimpleName() {
        return StringUtils.chomp(m_file.getName(), Constants.GWT_XML_EXT);
    }

    @Override
    public InputStream getContents() throws Exception {
        return m_file.getContents(true);
    }

    @Override
    public IResourcesProvider getResourcesProvider() throws Exception {
        return new DefaultResourcesProvider(this);
    }

    @Override
    public IProject getProject() {
        return m_file.getProject();
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // Module packages/folders access
    //
    ////////////////////////////////////////////////////////////////////////////
    /**
     * @return the {@link IFolder} that contains given module file.
     */
    @Override
    public IFolder getModuleFolder() {
        return (IFolder) m_file.getParent();
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // IModuleDescription
    //
    ////////////////////////////////////////////////////////////////////////////
    public List<String> getLocations() throws Exception {
        if (m_locations == null) {
            IProject project = getProject();
            IJavaProject javaProject = getJavaProject();
            m_locations = Lists.newArrayList();
            // add source locations
            {
                List<String> sourceLocations = Lists.newArrayList();
                ProjectClassLoader.addSourceLocations(Sets.<IProject>newHashSet(), sourceLocations, project);
                m_locations.addAll(sourceLocations);
            }
            // add binary locations
            {
                String[] classpath = ProjectClassLoader.getClasspath(javaProject);
                Collections.addAll(m_locations, classpath);
            }
            // keep output locations, because there may be Generator implementations
        }
        return m_locations;
    }

    public URL[] getURLs() throws Exception {
        if (m_urls == null) {
            List<String> locations = getLocations();
            m_urls = ProjectClassLoader.toURLs(locations);
        }
        return m_urls;
    }

    public ClassLoader getClassLoader() throws Exception {
        if (m_classLoader == null) {
            URL[] urls = getURLs();
            m_classLoader = new URLClassLoader(urls);
        }
        return m_classLoader;
    }
}