/*
 * 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 java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.QueryException;

import org.jboss.logging.Logger;
import antlr.RecognitionException;

/**
 * An error handler that counts parsing errors and warnings.
 */
public class ErrorCounter implements ParseErrorHandler {

    private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class, ErrorCounter.class.getName());

	private List errorList = new ArrayList();
	private List warningList = new ArrayList();
	private List recognitionExceptions = new ArrayList();

	public void reportError(RecognitionException e) {
		reportError( e.toString() );
		recognitionExceptions.add( e );
        LOG.error(e.toString(), e);
	}

	public void reportError(String message) {
        LOG.error(message);
		errorList.add( message );
	}

	public int getErrorCount() {
		return errorList.size();
	}

	public void reportWarning(String message) {
        LOG.debugf(message);
		warningList.add( message );
	}

	private String getErrorString() {
		StringBuffer buf = new StringBuffer();
		for ( Iterator iterator = errorList.iterator(); iterator.hasNext(); ) {
			buf.append( ( String ) iterator.next() );
			if ( iterator.hasNext() ) buf.append( "\n" );

		}
		return buf.toString();
	}

	public void throwQueryException() throws QueryException {
		if ( getErrorCount() > 0 ) {
            if (recognitionExceptions.size() > 0) throw QuerySyntaxException.convert((RecognitionException)recognitionExceptions.get(0));
            throw new QueryException(getErrorString());
        }
        LOG.debugf("throwQueryException() : no errors");
	}
}