trunk/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/index/aggregate/AggregateIndexProvider.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.jackrabbit.oak.plugins.index.aggregate;

import java.util.ArrayList;
import java.util.List;

import org.apache.jackrabbit.oak.spi.query.QueryIndex;
import org.apache.jackrabbit.oak.spi.query.QueryIndexProvider;
import org.apache.jackrabbit.oak.spi.state.NodeState;
import org.jetbrains.annotations.NotNull;

import static org.apache.jackrabbit.oak.spi.query.QueryIndex.AdvanceFulltextQueryIndex;

/**
 * A provider for aggregate indexes. It wraps all full-text query indexes.
 */
public class AggregateIndexProvider implements QueryIndexProvider {
    
    private final QueryIndexProvider baseProvider;
    
    AggregateIndexProvider(QueryIndexProvider baseProvider) {
        this.baseProvider = baseProvider;
    }
    
    @NotNull
    public static QueryIndexProvider wrap(
            @NotNull QueryIndexProvider baseProvider) {
        return new AggregateIndexProvider(baseProvider);
    }

    @Override @NotNull
    public List<? extends QueryIndex> getQueryIndexes(NodeState state) {
        List<? extends QueryIndex> list = baseProvider.getQueryIndexes(state);
        List<QueryIndex> newList = new ArrayList<QueryIndex>();
        for (QueryIndex index : list) {
            if (index instanceof AdvanceFulltextQueryIndex) {
                index = new AggregateIndex((AdvanceFulltextQueryIndex) index);
            }
            newList.add(index);
        }
        return newList;
    }

}