/***********************************************************************************************************************
 * 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.deadlockdetect;

import java.util.LinkedList;
import java.util.List;

import eu.stratosphere.compiler.plan.PlanNode;

public class DeadlockVertex {
	
	private PlanNode original;
	
	private List<DeadlockEdge> outEdges;
	
	private int inDegree;
	
	public DeadlockVertex( PlanNode original ) {
		this.original = original;
		outEdges = new LinkedList<DeadlockEdge>();
		inDegree = 0;
	}
	
	public void addEdge(DeadlockVertex destination) {
		
		// no duplicates
		for(DeadlockEdge e : outEdges) {
			if(e.getDestination().equals(destination)) {
				return;
			}
		}
		
		DeadlockEdge e = new DeadlockEdge(destination);
		this.outEdges.add(e);
	}
	
	public boolean equals(Object o) {
		
		if(!(o instanceof DeadlockVertex)) {
			return false;
		}
		
		DeadlockVertex v = (DeadlockVertex) o;
		if(v.getOriginal().equals(this.getOriginal())) {
			return true;
		}
		
		return false;
	}
	
	public int hashCode() {
		return this.original.hashCode();
	}
	
	public String toString() {
		return original.toString();
	}
	public PlanNode getOriginal() {
		return original;
	}

	public void setOriginal(PlanNode original) {
		this.original = original;
	}

	public int getInDegree() {
		return inDegree;
	}

	public void setInDegree(int inDegree) {
		this.inDegree = inDegree;
	}
	
	public List<DeadlockEdge> getOutEdges() {
		return outEdges;
	}

	public void setOutEdges(List<DeadlockEdge> outEdges) {
		this.outEdges = outEdges;
	}
}