src/main/java/org/apache/sling/feature/extension/apiregions/ArtifactRulesMergeHandler.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.sling.feature.extension.apiregions;

import org.apache.sling.feature.Extension;
import org.apache.sling.feature.Feature;
import org.apache.sling.feature.builder.HandlerContext;
import org.apache.sling.feature.builder.MergeHandler;
import org.apache.sling.feature.extension.apiregions.api.artifacts.ArtifactRules;

/**
 * Merge the artifact rules extension
 */
public class ArtifactRulesMergeHandler implements MergeHandler {

    @Override
    public boolean canMerge(final Extension extension) {
        return ArtifactRules.EXTENSION_NAME.equals(extension.getName());
    }

    @Override
    public void merge(final HandlerContext context, 
        final Feature targetFeature, 
        final Feature sourceFeature, 
        final Extension targetExtension, 
        final Extension sourceExtension) {

        if ( targetExtension == null ) {
            // no target available yet, just copy source
            final ArtifactRules sourceRules = ArtifactRules.getArtifactRules(sourceExtension);
            ArtifactRules.setArtifactRules(targetFeature, sourceRules);
        } else {
            final ArtifactRules sourceRules = ArtifactRules.getArtifactRules(sourceExtension);
            final ArtifactRules targetRules = ArtifactRules.getArtifactRules(targetExtension);

            // mode merging
            if ( context.isInitialMerge() ) {
                targetRules.setMode(sourceRules.getMode());
            } else {
                if ( targetRules.getMode().ordinal() > sourceRules.getMode().ordinal() ) {
                    targetRules.setMode(sourceRules.getMode());
                }
            }

            // merge - just add
            targetRules.getBundleVersionRules().addAll(sourceRules.getBundleVersionRules());
            
            ArtifactRules.setArtifactRules(targetFeature, targetRules);
        }
    }
}