/*
* 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.common.operators;
import java.util.ArrayList;
import java.util.List;
import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.functions.AbstractRichFunction;
import org.apache.flink.api.common.functions.RuntimeContext;
import org.apache.flink.api.common.operators.util.UserCodeClassWrapper;
/**
* This operator represents a Union between two inputs.
*/
@Internal
public class Union<T> extends DualInputOperator<T, T, T, AbstractRichFunction> {
/**
* Creates a new Union operator.
*/
public Union(BinaryOperatorInformation<T, T, T> operatorInfo, String unionLocationName) {
// we pass it an AbstractFunction, because currently all operators expect some form of UDF
super(new UserCodeClassWrapper<AbstractRichFunction>(AbstractRichFunction.class), operatorInfo, "Union at "+unionLocationName);
}
public Union(Operator<T> input1, Operator<T> input2, String unionLocationName) {
this(new BinaryOperatorInformation<T, T, T>(input1.getOperatorInfo().getOutputType(),
input1.getOperatorInfo().getOutputType(), input1.getOperatorInfo().getOutputType()), unionLocationName);
setFirstInput(input1);
setSecondInput(input2);
}
@Override
protected List<T> executeOnCollections(List<T> inputData1, List<T> inputData2, RuntimeContext runtimeContext, ExecutionConfig executionConfig) {
ArrayList<T> result = new ArrayList<T>(inputData1.size() + inputData2.size());
result.addAll(inputData1);
result.addAll(inputData2);
return result;
}
}