org.summer.dsl.builder.resourceloader.SerialResourceLoader.java Source code

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Here is the source code for org.summer.dsl.builder.resourceloader.SerialResourceLoader.java

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/*******************************************************************************
 * Copyright (c) 2011 Sigasi NV (http://www.sigasi.com) 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:
 *    Lieven Lemiengre - initial API and implementation and/or initial documentation
 *******************************************************************************/
package org.summer.dsl.builder.resourceloader;

import java.util.Collection;
import java.util.Queue;

import org.eclipse.core.resources.IProject;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.common.util.WrappedException;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.xtext.ui.resource.IResourceSetProvider;

import com.google.common.collect.Lists;

/**
 * Loads resources in sequentially in the same thread as it was invoked.
 *
 * @author Lieven Lemiengre - Initial contribution and API
 * @author Sebastian Zarnekow - Use IProject aware IResourceSetProvider instead of Provider<XtextResourceSet>
 * @since 2.1
 */
public class SerialResourceLoader extends AbstractResourceLoader {

    public SerialResourceLoader(IResourceSetProvider resourceSetProvider, Sorter sorter) {
        super(resourceSetProvider, sorter);
    }

    public LoadOperation create(final ResourceSet parent, IProject project) {
        final Queue<URI> queue = Lists.newLinkedList();
        return new CheckedLoadOperation(new LoadOperation() {

            public LoadResult next() {
                URI uri = queue.poll();
                try {
                    Resource resource = parent.getResource(uri, true);
                    return new LoadResult(resource, uri);
                } catch (WrappedException e) {
                    throw new LoadOperationException(uri, (Exception) e.getCause());
                }
            }

            public boolean hasNext() {
                return !queue.isEmpty();
            }

            public Collection<URI> cancel() {
                return queue;
            }

            public void load(Collection<URI> uris) {
                queue.addAll(getSorter().sort(uris));
            }
        });
    }

}