/*
    * 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) 2015 Jeremy Long. All Rights Reserved.
   */
  package org.owasp.dependencycheck.xml.pom;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.Reader;
  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  import org.xml.sax.XMLReader;
  
  /**
   * A parser for pom.xml files.
   *
   * @author Jeremy Long
   */
  public class PomParser {
  
      /**
       * The logger.
       */
      private static final Logger LOGGER = LoggerFactory.getLogger(PomParser.class);
  
      /**
       * Parses the given xml file and returns a Model object containing only the fields dependency-check requires.
       *
       * @param file a pom.xml
       * @return a Model object containing only the fields dependency-check requires
       * @throws PomParseException thrown if the xml file cannot be parsed
       */
      public Model parse(File file) throws PomParseException {
          FileInputStream fis = null;
          try {
              fis = new FileInputStream(file);
              return parse(fis);
          } catch (IOException ex) {
              LOGGER.debug("", ex);
              throw new PomParseException(ex);
          } finally {
              if (fis != null) {
                  try {
                      fis.close();
                  } catch (IOException ex) {
                      LOGGER.debug("Unable to close stream", ex);
                  }
              }
          }
      }
  
      /**
       * Parses the given XML file and returns a Model object containing only the fields dependency-check requires.
       *
       * @param inputStream an InputStream containing suppression rues
       * @return a list of suppression rules
       * @throws PomParseException if the XML cannot be parsed
       */
      public Model parse(InputStream inputStream) throws PomParseException {
          try {
              final PomHandler handler = new PomHandler();
              final SAXParserFactory factory = SAXParserFactory.newInstance();
  //            factory.setNamespaceAware(true);
  //            factory.setValidating(true);
              final SAXParser saxParser = factory.newSAXParser();
              final XMLReader xmlReader = saxParser.getXMLReader();
              xmlReader.setContentHandler(handler);
  
              final Reader reader = new InputStreamReader(inputStream, "UTF-8");
              final InputSource in = new InputSource(reader);
              //in.setEncoding("UTF-8");
  
              xmlReader.parse(in);
  
              return handler.getModel();
          } catch (ParserConfigurationException ex) {
             LOGGER.debug("", ex);
             throw new PomParseException(ex);
         } catch (SAXException ex) {
             LOGGER.debug("", ex);
             throw new PomParseException(ex);
         } catch (FileNotFoundException ex) {
             LOGGER.debug("", ex);
             throw new PomParseException(ex);
         } catch (IOException ex) {
             LOGGER.debug("", ex);
             throw new PomParseException(ex);
         }
     }
 }