org.eclipse.xtext.ui.refactoring.impl.ProjectUtil.java Source code

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Here is the source code for org.eclipse.xtext.ui.refactoring.impl.ProjectUtil.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.refactoring.impl;

import java.util.NoSuchElementException;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IStorage;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.emf.common.util.URI;
import org.eclipse.xtext.ui.resource.IStorage2UriMapper;
import org.eclipse.xtext.util.Pair;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.inject.Inject;

/**
 * Converts {@link URI}s to {@link IFile}s and {@link IProject}s.
 * 
 * @author Jan Koehnlein - Initial contribution and API
 */
public class ProjectUtil {

    @Inject
    private IWorkspace workspace;

    @Inject
    private IStorage2UriMapper mapper;

    /**
     * @return null if there is no such project or the file is not accessible
     */
    public IProject getProject(URI uri) {
        IFile file = findFileStorage(uri, false);
        if (file == null)
            return null;
        return file.getProject();
    }

    /**
     * @return null if there is no such file or the file is not editable
     */
    public IFile findFileStorage(final URI uri, final boolean validateEdit) {
        Iterable<Pair<IStorage, IProject>> storages = mapper.getStorages(uri);
        try {
            Pair<IStorage, IProject> fileStorage = Iterables.find(storages,
                    new Predicate<Pair<IStorage, IProject>>() {
                        @Override
                        public boolean apply(Pair<IStorage, IProject> input) {
                            IStorage storage = input.getFirst();
                            if (storage instanceof IFile) {
                                IFile file = (IFile) storage;
                                return file.isAccessible() && (!validateEdit || !file.isReadOnly()
                                        || workspace.validateEdit(new IFile[] { file }, null).isOK());
                            }
                            return false;
                        }
                    });
            return (IFile) fileStorage.getFirst();
        } catch (NoSuchElementException e) {
            return null;
        }
    }

}