/**
 * Copyright (C) 2010-2017 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
package org.evosuite.graphs.cfg;

import org.evosuite.coverage.branch.Branch;
import org.jgrapht.graph.DefaultEdge;
public class ControlFlowEdge extends DefaultEdge {

	private static final long serialVersionUID = -5009449930477928101L;

	private ControlDependency cd;
	private boolean isExceptionEdge;

	/**
	 * <p>Constructor for ControlFlowEdge.</p>
	 */
	public ControlFlowEdge() {
		this.cd = null;
		this.isExceptionEdge = false;
	}

	/**
	 * <p>Constructor for ControlFlowEdge.</p>
	 *
	 * @param isExceptionEdge a boolean.
	 */
	public ControlFlowEdge(boolean isExceptionEdge) {
		this.isExceptionEdge = isExceptionEdge;
	}
	
	/**
	 * <p>Constructor for ControlFlowEdge.</p>
	 *
	 * @param cd a {@link org.evosuite.graphs.cfg.ControlDependency} object.
	 * @param isExceptionEdge a boolean.
	 */
	public ControlFlowEdge(ControlDependency cd, boolean isExceptionEdge) {
		this.cd = cd;
		this.isExceptionEdge = isExceptionEdge;
	}
	

	/**
	 * Sort of a copy constructor
	 *
	 * @param clone a {@link org.evosuite.graphs.cfg.ControlFlowEdge} object.
	 */
	public ControlFlowEdge(ControlFlowEdge clone) {
		if(clone != null) {
			this.cd = clone.cd;
			this.isExceptionEdge = clone.isExceptionEdge;
		}
	}

	/**
	 * <p>getControlDependency</p>
	 *
	 * @return a {@link org.evosuite.graphs.cfg.ControlDependency} object.
	 */
	public ControlDependency getControlDependency() {
		return cd;
	}

	/**
	 * <p>hasControlDependency</p>
	 *
	 * @return a boolean.
	 */
	public boolean hasControlDependency() {
		return cd != null;
	}
	
	/**
	 * <p>getBranchInstruction</p>
	 *
	 * @return a {@link org.evosuite.coverage.branch.Branch} object.
	 */
	public Branch getBranchInstruction() {
		if(cd == null)
			return null;
		
		return cd.getBranch();
	}
	
	/**
	 * <p>isExceptionEdge</p>
	 *
	 * @return a boolean.
	 */
	public boolean isExceptionEdge() {
		return isExceptionEdge;
	}

	/**
	 * <p>getBranchExpressionValue</p>
	 *
	 * @return a boolean.
	 */
	public boolean getBranchExpressionValue() {
		if(hasControlDependency())
			return cd.getBranchExpressionValue();
		
		return true;
	}
	
//	@Override
//	public int hashCode() {
//		final int prime = 31;
//		int result = 1;
//		result = prime * result + ((cd == null) ? 0 : cd.hashCode());
//		result = prime * result + (isExceptionEdge ? 1231 : 1237);
//		return result;
//	}
//
//	@Override
//	public boolean equals(Object obj) {
//		if (this == obj)
//			return true;
//		if (obj == null)
//			return false;
//		if (getClass() != obj.getClass())
//			return false;
//		ControlFlowEdge other = (ControlFlowEdge) obj;
//		if (cd == null) {
//			if (other.cd != null)
//				return false;
//		} else if (!cd.equals(other.cd))
//			return false;
//		if (isExceptionEdge != other.isExceptionEdge)
//			return false;
//		return true;
//	}

	/** {@inheritDoc} */
	@Override
	public String toString() {
		String r = "";
		if(isExceptionEdge)
			 r+= "E ";
		if (cd != null)
			r += cd.toString();
		return r;
	}
}