com.b2international.snowowl.datastore.internal.branch.CDOBranchMerger.java Source code

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Here is the source code for com.b2international.snowowl.datastore.internal.branch.CDOBranchMerger.java

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/*
 * Copyright 2011-2016 B2i Healthcare Pte Ltd, http://b2i.sg
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.b2international.snowowl.datastore.internal.branch;

import java.util.Collection;
import java.util.Map;

import org.eclipse.emf.cdo.common.branch.CDOBranch;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDelta;
import org.eclipse.emf.cdo.common.revision.delta.CDORevisionDelta;
import org.eclipse.emf.cdo.transaction.CDOTransaction;
import org.eclipse.emf.cdo.view.CDOView;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.spi.cdo.DefaultCDOMerger;

import com.b2international.snowowl.core.merge.MergeConflict;
import com.b2international.snowowl.datastore.cdo.ConflictMapper;
import com.b2international.snowowl.datastore.cdo.ICDOConflictProcessor;
import com.google.common.base.Function;
import com.google.common.collect.Maps;

/**
 * An extension of CDO's {@link ManyValued many-valued} merger implementation, that delegates to a terminology-specific
 * {@link ICDOConflictProcessor} when considering certain types of changes.
 */
public class CDOBranchMerger extends DefaultCDOMerger.PerFeature.ManyValued {

    private final ICDOConflictProcessor delegate;
    private final boolean isRebase;
    private CDOBranch sourceBranch;
    private CDOBranch targetBranch;

    /**
     * Creates a new instance using the specified repository identifier.
     * 
     * @param delegate the CDO conflict processor handling terminology-specific merge decisions 
     * @param targetBranch 
     * @param sourceBranch 
     */
    public CDOBranchMerger(final ICDOConflictProcessor delegate, CDOBranch sourceBranch, CDOBranch targetBranch,
            final boolean isRebase) {
        this.delegate = delegate;
        this.sourceBranch = sourceBranch;
        this.targetBranch = targetBranch;
        this.isRebase = isRebase;
    }

    @Override
    protected Object addedInSource(final CDORevision revision) {
        return delegate.addedInSource(revision, getTargetMap());
    }

    @Override
    protected Object addedInTarget(final CDORevision revision) {
        return delegate.addedInTarget(revision, getSourceMap());
    }

    @Override
    protected Object detachedInSource(CDOID id) {
        return delegate.detachedInSource(id);
    }

    @Override
    protected Object detachedInTarget(CDOID id) {
        return delegate.detachedInTarget(id);
    }

    @Override
    protected Object changedInTargetAndDetachedInSource(final CDORevisionDelta targetDelta) {
        return delegate.changedInTargetAndDetachedInSource(targetDelta);
    }

    @Override
    protected CDOFeatureDelta changedInSourceAndTargetSingleValued(final EStructuralFeature feature,
            final CDORevisionDelta targetDelta, final CDOFeatureDelta targetFeatureDelta,
            final CDORevisionDelta sourceDelta, final CDOFeatureDelta sourceFeatureDelta) {

        return delegate.changedInSourceAndTargetSingleValued(targetDelta, targetFeatureDelta, sourceDelta,
                sourceFeatureDelta);
    }

    @Override
    protected void preProcess() {
        delegate.preProcess(getSourceMap(), getTargetMap(), sourceBranch, targetBranch, isRebase);
    }

    @Override
    public Map<CDOID, Conflict> getConflicts() {
        // Due to the nature of rebase we need to transform certain conflicts to reflect the source and target branches properly
        if (isRebase) {
            return Maps.transformValues(super.getConflicts(), new Function<Conflict, Conflict>() {
                @Override
                public Conflict apply(Conflict input) {
                    return ConflictMapper.invert(input);
                }
            });
        }
        return super.getConflicts();
    }

    public void postProcess(final CDOTransaction transaction) {
        delegate.postProcess(transaction);
    }

    public Collection<MergeConflict> handleCDOConflicts(final CDOView sourceView, final CDOView targetView) {
        if (isRebase) {
            return delegate.handleCDOConflicts(targetView, sourceView, getConflicts());
        }
        return delegate.handleCDOConflicts(sourceView, targetView, getConflicts());
    }
}