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/***********************************************************************************************************************
 * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
 *
 * Licensed 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 eu.stratosphere.compiler.dag;

import eu.stratosphere.api.common.operators.util.FieldSet;
import eu.stratosphere.compiler.DataStatistics;
import eu.stratosphere.compiler.operators.NoOpDescriptor;

/**
 * The optimizer's internal representation of a No Operation node.
 */
public class NoOpNode extends UnaryOperatorNode {
	
	public NoOpNode() {
		super("No Op", new FieldSet(), new NoOpDescriptor());
	}
	
	public NoOpNode(String name) {
		super(name, new FieldSet(), new NoOpDescriptor());
	}
	
	@Override
	protected void computeOperatorSpecificDefaultEstimates(DataStatistics statistics) {
		this.estimatedNumRecords = getPredecessorNode().getEstimatedNumRecords();
		this.estimatedOutputSize = getPredecessorNode().getEstimatedOutputSize();
	}
}