/*
* Copyright (c) 2010, IETR/INSA of Rennes
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the IETR/INSA of Rennes nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
package net.sf.orcc.tools.sequitur;
/**
* This class defines a guard symbol.
*
* @author Matthieu Wipliez
*
*/
public class GuardSymbol extends Symbol {
private Rule rule;
/**
* Creates a new guard symbol associated with the given rule.
*
* @param rule
* the rule that references this guard
*/
public GuardSymbol(Rule rule) {
this.rule = rule;
append(this);
}
@Override
public Symbol copy() {
return new GuardSymbol(rule);
}
@Override
public boolean equals(Object obj) {
if (obj instanceof GuardSymbol) {
GuardSymbol symbol = (GuardSymbol) obj;
return rule.equals(symbol.rule);
}
return false;
}
/**
* Returns the rule that references this guard.
*
* @return the rule that references this guard
*/
public Rule getRule() {
return rule;
}
@Override
public int hashCode() {
return rule.hashCode();
}
@Override
public boolean isGuard() {
return true;
}
@Override
public String toString() {
return "guard of rule " + rule.getName();
}
}