external/storm-sqe/src/main/java/com/jwplayer/sqe/trident/function/GetMapValue.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 com.jwplayer.sqe.trident.function;

import java.util.Map;
import org.apache.storm.trident.operation.BaseFunction;
import org.apache.storm.trident.operation.TridentCollector;
import org.apache.storm.trident.tuple.TridentTuple;
import org.apache.storm.tuple.Values;


public class GetMapValue extends BaseFunction{

    @Override
    public void execute(TridentTuple tuple, TridentCollector collector) {
        // TODO Auto-generated method stub
        @SuppressWarnings("unchecked")
        Map<Object, Object> m = (Map<Object, Object>) tuple.get(0);
        Object key = tuple.get(1);

        if (m.containsKey(key)){
            collector.emit(new Values(m.get(key)));
        }
    }

}