org.eclipse.xtext.resource.containers.DescriptionAddingContainer.java Source code

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Here is the source code for org.eclipse.xtext.resource.containers.DescriptionAddingContainer.java

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/*******************************************************************************
 * Copyright (c) 2010 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.resource.containers;

import java.util.Collections;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.xtext.naming.QualifiedName;
import org.eclipse.xtext.resource.IContainer;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.resource.IResourceDescription;
import org.eclipse.xtext.resource.impl.AbstractContainer;

import com.google.common.collect.Iterables;

/**
 * A container implementation that ensures that a given resource description
 * is part of the container. Delegates any other requests to another container.
 * 
 * @author Sebastian Zarnekow - Initial contribution and API
 */
public class DescriptionAddingContainer extends AbstractContainer {

    private final IResourceDescription description;
    private final IContainer delegate;

    /**
     * @param addMe the description to be merged into this container. May not be contained in the given delegate.
     * @param delegate the backing container.
     */
    public DescriptionAddingContainer(IResourceDescription addMe, IContainer delegate) {
        this.description = addMe;
        this.delegate = delegate;
    }

    @Override
    public Iterable<IResourceDescription> getResourceDescriptions() {
        return Iterables.concat(Collections.singleton(description), delegate.getResourceDescriptions());
    }

    @Override
    public int getResourceDescriptionCount() {
        return delegate.getResourceDescriptionCount() + 1;
    }

    @Override
    public boolean hasResourceDescription(URI uri) {
        if (uri.equals(description.getURI()))
            return true;
        return delegate.hasResourceDescription(uri);
    }

    @Override
    public boolean isEmpty() {
        return false;
    }

    @Override
    public Iterable<IEObjectDescription> getExportedObjects(EClass type, QualifiedName qualifiedName,
            boolean ignoreCase) {
        Iterable<IEObjectDescription> added = description.getExportedObjects(type, qualifiedName, ignoreCase);
        Iterable<IEObjectDescription> delegated = delegate.getExportedObjects(type, qualifiedName, ignoreCase);
        return Iterables.concat(added, delegated);
    }

    @Override
    public Iterable<IEObjectDescription> getExportedObjectsByType(EClass type) {
        Iterable<IEObjectDescription> added = description.getExportedObjectsByType(type);
        Iterable<IEObjectDescription> delegated = delegate.getExportedObjectsByType(type);
        return Iterables.concat(added, delegated);
    }

    @Override
    public IResourceDescription getResourceDescription(URI uri) {
        if (description.getURI().equals(uri))
            return description;
        return delegate.getResourceDescription(uri);
    }

}