org.eclipse.xtext.ide.serializer.impl.RelatedResourcesProvider.java Source code

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Here is the source code for org.eclipse.xtext.ide.serializer.impl.RelatedResourcesProvider.java

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/*******************************************************************************
 * Copyright (c) 2017 TypeFox GmbH (http://www.typefox.io) 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.ide.serializer.impl;

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.emf.common.util.URI;
import org.eclipse.xtext.ide.serializer.hooks.IEObjectSnapshot;
import org.eclipse.xtext.ide.serializer.hooks.IReferenceSnapshot;
import org.eclipse.xtext.ide.serializer.hooks.IResourceSnapshot;

import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;

/**
 * @author Moritz Eysholdt - Initial contribution and API
 */
public class RelatedResourcesProvider {

    public static class RelatedResource {
        protected final List<IReferenceSnapshot> outgoingReferences = Lists.newArrayList();

        protected final URI uri;

        public RelatedResource(URI uri) {
            super();
            this.uri = uri;
        }

        public URI getUri() {
            return uri;
        }

        @Override
        public String toString() {
            List<String> out = Lists.newArrayList();
            for (IReferenceSnapshot s : outgoingReferences) {
                out.add(s.toString());
            }
            Collections.sort(out);
            return getClass().getSimpleName() + " " + uri + "\n" + Joiner.on("\n").join(out);
        }
    }

    public List<RelatedResource> getRelatedResources(Collection<IResourceSnapshot> snapshots) {
        Map<URI, RelatedResource> result = Maps.newLinkedHashMap();
        for (IResourceSnapshot res : snapshots) {
            for (IEObjectSnapshot obj : res.getObjects().values()) {
                for (IReferenceSnapshot ref : obj.getIncomingReferences()) {
                    URI source = ref.getSourceEObjectUri().trimFragment();
                    RelatedResource related = result.get(source);
                    if (related == null) {
                        related = new RelatedResource(source);
                        result.put(source, related);
                    }
                    related.outgoingReferences.add(ref);
                }
            }
        }
        Set<URI> added = Sets.newHashSet();
        Set<URI> removed = Sets.newHashSet();
        for (IResourceSnapshot res : snapshots) {
            URI oldUri = res.getURI();
            URI newUri = res.getResource().getURI();
            if (!oldUri.equals(newUri)) {
                added.add(newUri);
                removed.add(oldUri);
            } else {
                result.remove(newUri);
            }
        }
        removed.removeAll(added);
        for (URI uri : removed) {
            result.remove(uri);
        }
        return ImmutableList.copyOf(result.values());
    }

}