/*
 * 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.optimizer.plan;

import java.util.List;

import org.apache.flink.optimizer.CompilerException;
import org.apache.flink.optimizer.costs.Costs;
import org.apache.flink.optimizer.dag.SinkJoiner;
import org.apache.flink.runtime.operators.DriverStrategy;


/**
 *
 */
public class SinkJoinerPlanNode extends DualInputPlanNode {
	
	public SinkJoinerPlanNode(SinkJoiner template, Channel input1, Channel input2) {
		super(template, "", input1, input2, DriverStrategy.BINARY_NO_OP);
	}
	
	// --------------------------------------------------------------------------------------------
	
	public void setCosts(Costs nodeCosts) {
		// the plan enumeration logic works as for regular two-input-operators, which is important
		// because of the branch handling logic. it does pick redistributing network channels
		// between the sink and the sink joiner, because sinks joiner has a different parallelism than the sink.
		// we discard any cost and simply use the sum of the costs from the two children.
		
		Costs totalCosts = getInput1().getSource().getCumulativeCosts().clone();
		totalCosts.addCosts(getInput2().getSource().getCumulativeCosts());
		super.setCosts(totalCosts);
	}
	
	// --------------------------------------------------------------------------------------------
	
	public void getDataSinks(List<SinkPlanNode> sinks) {
		final PlanNode in1 = this.input1.getSource();
		final PlanNode in2 = this.input2.getSource();
		
		if (in1 instanceof SinkPlanNode) {
			sinks.add((SinkPlanNode) in1);
		} else if (in1 instanceof SinkJoinerPlanNode) {
			((SinkJoinerPlanNode) in1).getDataSinks(sinks);
		} else {
			throw new CompilerException("Illegal child node for a sink joiner utility node: Neither Sink nor Sink Joiner");
		}
		
		if (in2 instanceof SinkPlanNode) {
			sinks.add((SinkPlanNode) in2);
		} else if (in2 instanceof SinkJoinerPlanNode) {
			((SinkJoinerPlanNode) in2).getDataSinks(sinks);
		} else {
			throw new CompilerException("Illegal child node for a sink joiner utility node: Neither Sink nor Sink Joiner");
		}
	}
}