oak-query-spi/src/main/java/org/apache/jackrabbit/oak/spi/query/WhiteboardIndexProvider.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.spi.query;

import java.util.List;

import org.apache.jackrabbit.oak.spi.state.NodeState;
import org.apache.jackrabbit.oak.spi.whiteboard.AbstractServiceTracker;
import org.jetbrains.annotations.NotNull;

/**
 * Dynamic {@link QueryIndexProvider} based on the available
 * whiteboard services.
 */
public class WhiteboardIndexProvider
        extends AbstractServiceTracker<QueryIndexProvider>
        implements QueryIndexProvider {

    public WhiteboardIndexProvider() {
        super(QueryIndexProvider.class);
    }

    @Override @NotNull
    public List<? extends QueryIndex> getQueryIndexes(NodeState nodeState) {
        QueryIndexProvider composite =
                CompositeQueryIndexProvider.compose(getServices());
        return composite.getQueryIndexes(nodeState);
    }

}