org.eclipse.xtext.ui.shared.JdtHelper.java Source code

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Here is the source code for org.eclipse.xtext.ui.shared.JdtHelper.java

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/*******************************************************************************
 * Copyright (c) 2011 itemis AG (http://www.itemis.eu) 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
 *******************************************************************************/
package org.eclipse.xtext.ui.shared;

import org.apache.log4j.Logger;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.xtext.ui.shared.internal.Activator;
import org.eclipse.xtext.ui.util.IJdtHelper;

import com.google.inject.Singleton;

/*
 * Important note:
 * ===============
 * Neither the interface nor the implementation class(es) may
 * expose any types from jdt.core in its signatures or use
 * any exceptions from jdt.core in catch clauses.
 */
/**
 * Default implementation of the {@link IJdtHelper}.
 * @author Sebastian Zarnekow - Initial contribution and API
 * @since 2.1
 */
@Singleton
public class JdtHelper implements IJdtHelper {

    private static final Logger log = Logger.getLogger(JdtHelper.class);

    private final boolean javaCoreAvailable;

    public JdtHelper() {
        javaCoreAvailable = computeJavaCoreAvailable();
    }

    protected boolean computeJavaCoreAvailable() {
        return Activator.isJavaEnabled();
    }

    @Override
    public boolean isJavaCoreAvailable() {
        return javaCoreAvailable;
    }

    // TODO consider caching the output path's per project
    // TODO have a more detailed look at other clients of #getOutputLocation to get the corner cases right
    @Override
    public boolean isFromOutputPath(IResource resource) {
        IProject project = resource.getProject();
        IJavaProject javaProject = JavaCore.create(project);
        if (javaProject != null && javaProject.exists()) {
            try {
                IPath defaultOutputLocation = javaProject.getOutputLocation();
                IPath resourcePath = resource.getFullPath();
                if (defaultOutputLocation != null && !defaultOutputLocation.isEmpty()
                        && defaultOutputLocation.isPrefixOf(resourcePath)) {
                    return true;
                }
                IClasspathEntry[] classpathEntries = javaProject.getRawClasspath();
                for (IClasspathEntry classpathEntry : classpathEntries) {
                    if (classpathEntry.getEntryKind() == IClasspathEntry.CPE_SOURCE) {
                        IPath specializedOutputLocation = classpathEntry.getOutputLocation();
                        if (specializedOutputLocation != null) {
                            if (!specializedOutputLocation.equals(classpathEntry.getPath())
                                    && specializedOutputLocation.isPrefixOf(resourcePath)) {
                                return true;
                            }
                        }
                    }
                }
            } catch (CoreException e) {
                if (log.isDebugEnabled())
                    log.debug("Error in isJavaTargetFolder():" + e.getMessage(), e);
            }
        }
        return false;
    }
}