    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     * contributor license agreements.  See the NOTICE file distributed with
    004     * this work for additional information regarding copyright ownership.
    005     * The ASF licenses this file to You under the Apache License, Version 2.0
    006     * (the "License"); you may not use this file except in compliance with
    007     * the License.  You may obtain a copy of the License at
    008     *
    009     *     http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     * Unless required by applicable law or agreed to in writing, software
    012     * distributed under the License is distributed on an "AS IS" BASIS,
    013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     * See the License for the specific language governing permissions and
    015     * limitations under the License.
    016     */
    017    package org.apache.commons.scxml.env;
    018
    019    import java.io.Serializable;
    020
    021    import org.apache.commons.logging.Log;
    022    import org.apache.commons.logging.LogFactory;
    023    import org.xml.sax.ErrorHandler;
    024    import org.xml.sax.SAXParseException;
    025
    026    /**
    027     * Custom error handler that logs the parsing errors in the
    028     * SCXML document.
    029     */
    030    public class SimpleErrorHandler implements ErrorHandler, Serializable {
    031
    032        /** Serial version UID. */
    033        private static final long serialVersionUID = 1L;
    034        /** Message prefix. */
    035        private static final String MSG_PREFIX = "SCXML SAX Parsing: ";
    036        /** Message postfix. */
    037        private static final String MSG_POSTFIX = " Correct the SCXML document.";
    038
    039        /** Log. */
    040        private Log log = LogFactory.getLog(getClass());
    041
    042        /**
    043         * Constructor.
    044         */
    045        public SimpleErrorHandler() {
    046            super();
    047        }
    048
    049        /**
    050         * @see ErrorHandler#error(SAXParseException)
    051         */
    052        public void error(final SAXParseException exception) {
    053            if (log.isErrorEnabled()) {
    054                log.error(MSG_PREFIX + exception.getMessage() + MSG_POSTFIX,
    055                    exception);
    056            }
    057        }
    058
    059        /**
    060         * @see ErrorHandler#fatalError(SAXParseException)
    061         */
    062        public void fatalError(final SAXParseException exception) {
    063            if (log.isFatalEnabled()) {
    064                log.fatal(MSG_PREFIX + exception.getMessage() + MSG_POSTFIX,
    065                    exception);
    066            }
    067        }
    068
    069        /**
    070         * @see ErrorHandler#warning(SAXParseException)
    071         */
    072        public void warning(final SAXParseException exception) {
    073            if (log.isWarnEnabled()) {
    074                log.warn(MSG_PREFIX + exception.getMessage() + MSG_POSTFIX,
    075                    exception);
    076            }
    077        }
    078    }
    079