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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */
package templates.security;

import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

import com.gemstone.gemfire.LogWriter;

/**
 * Implementation of {@link ErrorHandler} interface to handle validation errors
 * while XML parsing.
 * 
 * This throws back exceptions raised for error and
 * fatalError cases while a {@link LogWriter#warning(String)} level
 * logging is done for the warning case.
 * 
 * @author Sumedh Wale
 * @since 5.5
 */
public class XmlErrorHandler implements ErrorHandler {

  private LogWriter logger;

  private String xmlFileName;

  public XmlErrorHandler(LogWriter logger, String xmlFileName) {

    this.logger = logger;
    this.xmlFileName = xmlFileName;
  }

  /**
   * Throws back the exception with the name of the XML file and the position
   * where the exception occurred.
   */
  public void error(SAXParseException exception) throws SAXException {

    throw new SAXParseException("Error while parsing XML at line "
        + exception.getLineNumber() + " column " + exception.getColumnNumber()
        + ": " + exception.getMessage(), null);
  }

  /**
   * Throws back the exception with the name of the XML file and the position
   * where the exception occurred.
   */
  public void fatalError(SAXParseException exception) throws SAXException {

    throw new SAXParseException("Fatal error while parsing XML at line "
        + exception.getLineNumber() + " column " + exception.getColumnNumber()
        + ": " + exception.getMessage(), null);
  }

  /**
   * Log the exception at {@link LogWriter#warning(String)} level with XML
   * filename and the position of exception in the file.
   */
  public void warning(SAXParseException exception) throws SAXException {

    this.logger.warning("Warning while parsing XML [" + this.xmlFileName
        + "] at line " + exception.getLineNumber() + " column "
        + exception.getColumnNumber() + ": " + exception.getMessage());
  }

}