org.eclipse.emf.mwe2.language.scoping.MapBasedScope.java Source code

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Here is the source code for org.eclipse.emf.mwe2.language.scoping.MapBasedScope.java

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/*******************************************************************************
 * Copyright (c) 2008,2010 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.emf.mwe2.language.scoping;

import static java.util.Collections.*;

import java.util.Map;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.xtext.naming.QualifiedName;
import org.eclipse.xtext.resource.EObjectDescription;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.scoping.IScope;
import org.eclipse.xtext.scoping.impl.AbstractScope;
import org.eclipse.xtext.util.Strings;

import com.google.common.base.Function;
import com.google.common.collect.Iterables;

/**
 * @author Sebastian Zarnekow - Initial contribution and API
 */
public class MapBasedScope extends AbstractScope {

    private Map<QualifiedName, ? extends EObject> entries;

    public MapBasedScope(Map<QualifiedName, ? extends EObject> entries) {
        super(IScope.NULLSCOPE, false);
        this.entries = entries;
    }

    @Override
    protected Iterable<IEObjectDescription> getAllLocalElements() {
        return Iterables.transform(entries.entrySet(),
                new Function<Map.Entry<QualifiedName, ? extends EObject>, IEObjectDescription>() {
                    public IEObjectDescription apply(Map.Entry<QualifiedName, ? extends EObject> from) {
                        return new MapEntry(from);
                    }
                });
    }

    @Override
    protected Iterable<IEObjectDescription> getLocalElementsByName(QualifiedName name) {
        EObject element = entries.get(name);
        if (element != null)
            return singleton(EObjectDescription.create(name, element));
        return emptySet();
    }

    public static class MapEntry implements IEObjectDescription {

        private final Map.Entry<QualifiedName, ? extends EObject> entry;

        public MapEntry(Map.Entry<QualifiedName, ? extends EObject> entry) {
            this.entry = entry;
        }

        public QualifiedName getName() {
            return entry.getKey();
        }

        public QualifiedName getQualifiedName() {
            return entry.getKey();
        }

        public EObject getEObjectOrProxy() {
            return entry.getValue();
        }

        public URI getEObjectURI() {
            return EcoreUtil.getURI(entry.getValue());
        }

        public EClass getEClass() {
            return entry.getValue().eClass();
        }

        public String getUserData(String name) {
            return null;
        }

        public String[] getUserDataKeys() {
            return Strings.EMPTY_ARRAY;
        }

    }

}