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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.java_cup.internal;
/** This class represents a part of a production which is a symbol (terminal
* or non terminal). This simply maintains a reference to the symbol in
* question.
*
* @see com.sun.java_cup.internal.production
* @version last updated: 11/25/95
* @author Scott Hudson
*/
public class symbol_part extends production_part {
/*-----------------------------------------------------------*/
/*--- Constructor(s) ----------------------------------------*/
/*-----------------------------------------------------------*/
/** Full constructor.
* @param sym the symbol that this part is made up of.
* @param lab an optional label string for the part.
*/
public symbol_part(symbol sym, String lab) throws internal_error
{
super(lab);
if (sym == null)
throw new internal_error(
"Attempt to construct a symbol_part with a null symbol");
_the_symbol = sym;
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Constructor with no label.
* @param sym the symbol that this part is made up of.
*/
public symbol_part(symbol sym) throws internal_error
{
this(sym,null);
}
/*-----------------------------------------------------------*/
/*--- (Access to) Instance Variables ------------------------*/
/*-----------------------------------------------------------*/
/** The symbol that this part is made up of. */
protected symbol _the_symbol;
/** The symbol that this part is made up of. */
public symbol the_symbol() {return _the_symbol;}
/*-----------------------------------------------------------*/
/*--- General Methods ---------------------------------------*/
/*-----------------------------------------------------------*/
/** Respond that we are not an action part. */
public boolean is_action() { return false; }
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Equality comparison. */
public boolean equals(symbol_part other)
{
return other != null && super.equals(other) &&
the_symbol().equals(other.the_symbol());
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Generic equality comparison. */
public boolean equals(Object other)
{
if (!(other instanceof symbol_part))
return false;
else
return equals((symbol_part)other);
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Produce a hash code. */
public int hashCode()
{
return super.hashCode() ^
(the_symbol()==null ? 0 : the_symbol().hashCode());
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Convert to a string. */
public String toString()
{
if (the_symbol() != null)
return super.toString() + the_symbol();
else
return super.toString() + "$$MISSING-SYMBOL$$";
}
/*-----------------------------------------------------------*/
}