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/*
* EJBQLASTFactory.java
*
* Created on November 12, 2001
*/
package com.sun.jdo.spi.persistence.support.ejb.ejbqlc;
import antlr.collections.AST;
import antlr.ASTFactory;
import java.util.ResourceBundle;
import org.glassfish.persistence.common.I18NHelper;
/**
* Factory to create and connect EJBQLAST nodes.
*
* @author Michael Bouschen
*/
public class EJBQLASTFactory
extends ASTFactory
{
/** The singleton EJBQLASTFactory instance. */
private static EJBQLASTFactory factory = new EJBQLASTFactory();
/** I18N support. */
private final static ResourceBundle msgs =
I18NHelper.loadBundle(EJBQLASTFactory.class);
/**
* Get an instance of EJBQLASTFactory.
* @return an instance of EJBQLASTFactory
*/
public static EJBQLASTFactory getInstance()
{
return factory;
}
/**
* Constructor. EJBQLASTFactory is a singleton, please use
* {@link #getInstance} to get the factory instance.
*/
protected EJBQLASTFactory()
{
this.theASTNodeTypeClass = EJBQLAST.class;
this.theASTNodeType = this.theASTNodeTypeClass.getName();
}
/** Overwrites superclass method to create the correct AST instance. */
public AST create()
{
return new EJBQLAST();
}
/** Overwrites superclass method to create the correct AST instance. */
public AST create(AST tr)
{
return create((EJBQLAST)tr);
}
/** Creates a clone of the specified EJBQLAST instance. */
public EJBQLAST create(EJBQLAST tr)
{
try {
return (tr==null) ? null : (EJBQLAST)tr.clone();
}
catch(CloneNotSupportedException ex) {
throw new EJBQLException(
I18NHelper.getMessage(msgs, "ERR_UnexpectedExceptionClone"), ex); //NOI18N
}
}
}