flink-java/src/main/java/org/apache/flink/api/java/operators/translation/TupleLeftUnwrappingJoiner.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.flink.api.java.operators.translation;

import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.functions.FlatJoinFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.util.Collector;

@Internal
public final class TupleLeftUnwrappingJoiner<I1, I2, OUT, K>
		extends WrappingFunction<FlatJoinFunction<I1, I2, OUT>>
		implements FlatJoinFunction<Tuple2<K, I1>, I2, OUT> {

	private static final long serialVersionUID = 1L;

	public TupleLeftUnwrappingJoiner(FlatJoinFunction<I1, I2, OUT> wrapped) {
		super(wrapped);
	}

	@SuppressWarnings("unchecked")
	@Override
	public void join(Tuple2<K, I1> value1, I2 value2, Collector<OUT> collector) throws Exception {
		wrappedFunction.join(value1 == null ? null : (I1) value1.getField(1), value2, collector);
	}
}