/*

  * This file is part of dependency-check-core.

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  *

  * Copyright (c) 2016 Jeremy Long. All Rights Reserved.

  */

 package org.owasp.dependencycheck.xml.hints;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 import org.xml.sax.ErrorHandler;

 import org.xml.sax.SAXException;

 import org.xml.sax.SAXParseException;

 /**

  * An XML parsing error handler.

  *

  * @author Jeremy Long

  */

 public class HintErrorHandler implements ErrorHandler {

     /**

      * The logger.

      */

     private static final Logger LOGGER = LoggerFactory.getLogger(HintErrorHandler.class);

     /**

      * Builds a prettier exception message.

      *

      * @param ex the SAXParseException

      * @return an easier to read exception message

      */

     private String getPrettyParseExceptionInfo(SAXParseException ex) {

         final StringBuilder sb = new StringBuilder();

         if (ex.getSystemId() != null) {

             sb.append("systemId=").append(ex.getSystemId()).append(", ");

         }

         if (ex.getPublicId() != null) {

             sb.append("publicId=").append(ex.getPublicId()).append(", ");

         }

         if (ex.getLineNumber() > 0) {

             sb.append("Line=").append(ex.getLineNumber());

         }

         if (ex.getColumnNumber() > 0) {

             sb.append(", Column=").append(ex.getColumnNumber());

         }

         sb.append(": ").append(ex.getMessage());

         return sb.toString();

     }

     /**

      * Logs warnings.

      *

      * @param ex the warning to log

      * @throws SAXException is never thrown

      */

     @Override

     public void warning(SAXParseException ex) throws SAXException {

         LOGGER.debug("", ex);

     }

     /**

      * Handles errors.

      *

      * @param ex the error to handle

      * @throws SAXException is always thrown

      */

     @Override

     public void error(SAXParseException ex) throws SAXException {

         throw new SAXException(getPrettyParseExceptionInfo(ex));

     }

     /**

      * Handles fatal exceptions.

      *

      * @param ex a fatal exception

      * @throws SAXException is always

      */

     @Override

     public void fatalError(SAXParseException ex) throws SAXException {

         throw new SAXException(getPrettyParseExceptionInfo(ex));

     }

 }