org.eclipse.xtext.grammaranalysis.impl.AbstractNFATransition Maven / Gradle / Ivy

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/*******************************************************************************
 * Copyright (c) 2009 itemis AG (http://www.itemis.eu) and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 *******************************************************************************/
package org.eclipse.xtext.grammaranalysis.impl;

import org.eclipse.xtext.AbstractElement;
import org.eclipse.xtext.grammaranalysis.INFAState;
import org.eclipse.xtext.grammaranalysis.INFATransition;

/**
 * @author Moritz Eysholdt - Initial contribution and API
 */
public class AbstractNFATransition, T extends INFATransition> implements
		INFATransition {

	final protected AbstractElement loopCenter;

	final protected boolean ruleCall;

	final protected S source;

	final protected S target;

	public AbstractNFATransition(S source, S target, boolean ruleCall, AbstractElement loopCenter) {
		super();
		this.source = source;
		this.target = target;
		this.ruleCall = ruleCall;
		this.loopCenter = loopCenter;
	}

	@SuppressWarnings("rawtypes")
	@Override
	public boolean equals(Object obj) {
		if (obj instanceof AbstractNFATransition) {
			AbstractNFATransition a = (AbstractNFATransition) obj;
			return a.source == source && a.target == target;
		}
		return false;
	}

	public AbstractElement getLoopCenter() {
		return loopCenter;
	}

	public int getPrecedence() {
		INFAState s = source;
		int i = s.getOutgoing().indexOf(this);
		return i > -1 ? i : s.getOutgoingAfterReturn().indexOf(this);
	}

	public S getSource() {
		return source;
	}

	public S getTarget() {
		return target;
	}

	@Override
	public int hashCode() {
		return source.hashCode() + target.hashCode();
	}

	public boolean isRuleCall() {
		return ruleCall;
	}

	@Override
	public String toString() {
		return source + " -> " + target;
	}

}