org.eclipse.xtext.resource.impl.EObjectDescriptionLookUp.java Source code

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Here is the source code for org.eclipse.xtext.resource.impl.EObjectDescriptionLookUp.java

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/*******************************************************************************
 * Copyright (c) 2009 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.impl;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.RandomAccess;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.xtext.EcoreUtil2;
import org.eclipse.xtext.naming.QualifiedName;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.resource.ISelectable;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

/**
 * @author Sebastian Zarnekow - Initial contribution and API
 * @author Sven Efftinge
 */
public class EObjectDescriptionLookUp implements ISelectable {

    private volatile Map<QualifiedName, List<IEObjectDescription>> nameToObjects;

    private volatile List<IEObjectDescription> allDescriptions;

    public EObjectDescriptionLookUp(List<IEObjectDescription> allDescriptions) {
        setExportedObjects(allDescriptions);
    }

    @Override
    public boolean isEmpty() {
        return allDescriptions.isEmpty();
    }

    @Override
    public Iterable<IEObjectDescription> getExportedObjectsByType(final EClass type) {
        if (allDescriptions.isEmpty())
            return Collections.emptyList();
        return Iterables.filter(allDescriptions, new Predicate<IEObjectDescription>() {
            @Override
            public boolean apply(IEObjectDescription input) {
                return EcoreUtil2.isAssignableFrom(type, input.getEClass());
            }
        });
    }

    @Override
    public Iterable<IEObjectDescription> getExportedObjectsByObject(final EObject object) {
        if (allDescriptions.isEmpty())
            return Collections.emptyList();
        final URI uri = EcoreUtil2.getPlatformResourceOrNormalizedURI(object);
        return Iterables.filter(allDescriptions, new Predicate<IEObjectDescription>() {
            @Override
            public boolean apply(IEObjectDescription input) {
                if (input.getEObjectOrProxy() == object)
                    return true;
                if (uri.equals(input.getEObjectURI())) {
                    return true;
                }
                return false;
            }
        });
    }

    @Override
    public Iterable<IEObjectDescription> getExportedObjects(final EClass type, final QualifiedName name,
            boolean ignoreCase) {
        if (allDescriptions.isEmpty())
            return Collections.emptyList();
        QualifiedName lowerCase = name.toLowerCase();
        List<IEObjectDescription> values = getNameToObjects().get(lowerCase);
        if (values == null)
            return Collections.emptyList();
        Predicate<IEObjectDescription> predicate = ignoreCase ? new Predicate<IEObjectDescription>() {
            @Override
            public boolean apply(IEObjectDescription input) {
                return EcoreUtil2.isAssignableFrom(type, input.getEClass());
            }
        } : new Predicate<IEObjectDescription>() {
            @Override
            public boolean apply(IEObjectDescription input) {
                return name.equals(input.getName()) && EcoreUtil2.isAssignableFrom(type, input.getEClass());
            }
        };
        return Iterables.filter(values, predicate);
    }

    @Override
    public Iterable<IEObjectDescription> getExportedObjects() {
        return allDescriptions;
    }

    public void setExportedObjects(List<IEObjectDescription> allDescriptions) {
        synchronized (this) {
            this.allDescriptions = allDescriptions;
            this.nameToObjects = null;
        }
    }

    protected Map<QualifiedName, List<IEObjectDescription>> getNameToObjects() {
        if (nameToObjects == null) {
            synchronized (this) {
                if (nameToObjects == null) {
                    Map<QualifiedName, List<IEObjectDescription>> nameToObjects = Maps
                            .newHashMapWithExpectedSize(allDescriptions.size());
                    if (allDescriptions instanceof RandomAccess) {
                        for (int i = 0; i < allDescriptions.size(); i++) {
                            IEObjectDescription description = allDescriptions.get(i);
                            putIntoMap(nameToObjects, description);
                        }
                    } else {
                        for (IEObjectDescription description : allDescriptions) {
                            putIntoMap(nameToObjects, description);
                        }
                    }
                    this.nameToObjects = nameToObjects;
                }
            }
        }
        return this.nameToObjects;
    }

    protected void putIntoMap(Map<QualifiedName, List<IEObjectDescription>> nameToObjects,
            IEObjectDescription description) {
        QualifiedName indexKey = description.getName().toLowerCase();
        List<IEObjectDescription> values = nameToObjects.get(indexKey);
        if (values == null) {
            values = Lists.newArrayListWithExpectedSize(2);
            nameToObjects.put(indexKey, values);
        }
        values.add(description);
    }

}