Hibernate example source code file (HqlLexer.java)

This example Hibernate source code file (HqlLexer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

charscanner, charscanner, classloader, hqlbaselexer, hqllexer, hqllexer, hqltoken, hqltoken, io, queryexception, thread, thread, token

The Hibernate HqlLexer.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program 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 General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.hql.internal.ast;
import antlr.Token;
import org.hibernate.QueryException;
import org.hibernate.hql.internal.antlr.HqlBaseLexer;

import java.io.InputStream;
import java.io.Reader;

/**
 * Custom lexer for the HQL grammar.  Extends the base lexer generated by ANTLR
 * in order to keep the grammar source file clean.
 */
class HqlLexer extends HqlBaseLexer {
	/**
	 * A logger for this class. *
	 */
	private boolean possibleID = false;

	public HqlLexer(InputStream in) {
		super( in );
	}

    public HqlLexer(Reader in) {
        super(in);
    }

	public void setTokenObjectClass(String cl) {
		Thread thread = null;
		ClassLoader contextClassLoader = null;
		try {
			// workaround HHH-6536, by setting TCCL to the Hibernate classloader
			thread = Thread.currentThread();
			contextClassLoader = thread.getContextClassLoader();
			thread.setContextClassLoader(HqlToken.class.getClassLoader());

			// Ignore the token class name parameter, and use a specific token class.
			super.setTokenObjectClass( HqlToken.class.getName() );
		}
		finally {
            thread.setContextClassLoader( contextClassLoader );
		}
	}

	protected void setPossibleID(boolean possibleID) {
		this.possibleID = possibleID;
	}

	protected Token makeToken(int i) {
		HqlToken token = ( HqlToken ) super.makeToken( i );
		token.setPossibleID( possibleID );
		possibleID = false;
		return token;
	}

	public int testLiteralsTable(int i) {
		int ttype = super.testLiteralsTable( i );
		return ttype;
	}

	public void panic() {
		//overriden to avoid System.exit
		panic("CharScanner: panic");
	}

	public void panic(String s) {
		//overriden to avoid System.exit
		throw new QueryException(s);
	}
}