package org.codehaus.mojo.jdepend;
   
   /*
    * #%L
    * JDepend Maven Plugin
    * %%
    * Copyright (C) 2006 - 2014 Codehaus
    * %%
    * 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.
   * #L%
   */
  
  import java.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Stack;
  
  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  
  import org.codehaus.mojo.jdepend.objects.CyclePackage;
  import org.codehaus.mojo.jdepend.objects.JDPackage;
  import org.codehaus.mojo.jdepend.objects.Stats;
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  import org.xml.sax.helpers.DefaultHandler;
  
  /**
   * @author Who ever this implemented first.
   */
  public class JDependXMLReportParser
      extends DefaultHandler
  {
      protected List<JDPackage> packages;
  
      protected JDPackage jdpackage;
  
      protected Stats stats;
  
      protected StringBuffer buffer = null;
  
      protected Stack<String> stack;
  
      protected List<CyclePackage> cycles;
  
      protected CyclePackage cyclePackage;
  
      ReportGenerator report;
  
      private boolean errFlag = false;
  
      /**
       * Creates a new instance of JDependXMLReportParser.
       * 
       * @param xmlFile
       * @throws ParserConfigurationException
       * @throws SAXException
       * @throws IOException
       */
      public JDependXMLReportParser( File xmlFile )
          throws ParserConfigurationException, SAXException, IOException
      {
          SAXParserFactory factory = SAXParserFactory.newInstance();
  
          /* Create an empty stack */
          stack = new Stack<String>();
  
          SAXParser saxParser = factory.newSAXParser();
  
          saxParser.parse( xmlFile, this );
  
      }
  
      /*
       * (non-Javadoc)
       * @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, java.lang.String,
       * org.xml.sax.Attributes)
       */
      public void startElement( String namespaceURI, String sName, String qName, Attributes attrs )
          throws SAXException
      {
  
          /* Push element name into stack */
          stack.push( qName );
  
          // TODO only create a new buffer when the element is expected to have
          // text
         buffer = new StringBuffer();
 
         if ( qName.equals( "Packages" ) )
         {
             packages = new ArrayList<JDPackage>();
         }
         else if ( qName.equals( "Package" ) )
         {
             if ( isParentElement( "Packages" ) )
             {
                 jdpackage = new JDPackage();
 
                 if ( attrs != null )
                 {
                     jdpackage.setPackageName( attrs.getValue( 0 ) );
                 }
             }
             else if ( isParentElement( "Cycles" ) )
             {
                 cyclePackage = new CyclePackage();
 
                 if ( attrs != null )
                 {
                     cyclePackage.setName( attrs.getValue( 0 ) );
                 }
             }
         }
         else if ( qName.equals( "Stats" ) )
         {
             stats = new Stats();
         }
         else if ( qName.equals( "Cycles" ) )
         {
             cycles = new ArrayList<CyclePackage>();
         }
     }
 
     /*
      * (non-Javadoc)
      * @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String, java.lang.String, java.lang.String)
      */
     public void endElement( String namespaceURI, String sName, String qName )
         throws SAXException
     {
 
         String elementValue = buffer != null ? buffer.toString().trim() : null;
 
         if ( qName.equals( "Package" ) )
         {
             if ( isParentElement( "Packages" ) )
             {
                 if ( errFlag == false )
                 {
                     jdpackage.setStats( stats );
 
                     packages.add( jdpackage );
                 }
                 errFlag = false;
             }
             else if ( isParentElement( "DependsUpon" ) )
             {
                 jdpackage.addDependsUpon( elementValue );
             }
             else if ( isParentElement( "UsedBy" ) )
             {
                 jdpackage.addUsedBy( elementValue );
             }
             else if ( isParentElement( "Package" ) )
             {
                 cyclePackage.addPackageList( elementValue );
             }
             else if ( isParentElement( "Cycles" ) )
             {
                 cycles.add( cyclePackage );
             }
         }
         else if ( qName.equals( "TotalClasses" ) )
         {
             stats.setTotalClasses( elementValue );
         }
         else if ( qName.equals( "ConcreteClasses" ) )
         {
             if ( isParentElement( "Stats" ) )
             {
                 stats.setConcreteClasses( elementValue );
             }
         }
         else if ( qName.equals( "AbstractClasses" ) )
         {
             if ( isParentElement( "Stats" ) )
             {
                 stats.setAbstractClasses( elementValue );
             }
         }
         else if ( qName.equals( "Ca" ) )
         {
             stats.setCa( elementValue );
         }
         else if ( qName.equals( "Ce" ) )
         {
             stats.setCe( elementValue );
         }
         else if ( qName.equals( "A" ) )
         {
             stats.setA( elementValue );
         }
         else if ( qName.equals( "I" ) )
         {
             stats.setI( elementValue );
         }
         else if ( qName.equals( "D" ) )
         {
             stats.setD( elementValue );
         }
         else if ( qName.equals( "V" ) )
         {
             stats.setV( elementValue );
         }
         else if ( qName.equals( "Class" ) )
         {
             if ( isParentElement( "AbstractClasses" ) )
             {
                 jdpackage.addAbstractClasses( elementValue );
             }
             else if ( isParentElement( "ConcreteClasses" ) )
             {
                 jdpackage.addConcreteClasses( elementValue );
             }
         }
         else if ( qName.equals( "error" ) )
         {
             if ( isParentElement( "Package" ) )
             {
                 errFlag = true;
             }
         }
 
         if ( stack.size() != 0 )
         {
             /* Remove element name in stack */
             stack.pop();
         }
 
         buffer = null;
     }
 
     /*
      * (non-Javadoc)
      * @see org.xml.sax.helpers.DefaultHandler#characters(char[], int, int)
      */
     public void characters( char[] buff, int offset, int len )
         throws SAXException
     {
         if ( buffer != null )
         {
             buffer.append( buff, offset, len );
         }
     }
 
     /**
      * @return Packages.
      */
     public List<JDPackage> getPackages()
     {
         return this.packages;
     }
 
     /**
      * @return stats.
      */
     public Stats getStats()
     {
         return this.stats;
     }
 
     /**
      * @return parent index.
      */
     private int getParentIndex()
     {
         int parentIndex = 0;
 
         parentIndex = stack.size() - 2;
 
         return parentIndex;
     }
 
     /**
      * @param parentElement
      * @return true otherwise false.
      */
     private boolean isParentElement( String parentElement )
     {
         boolean isParent = false;
 
         isParent = stack.get( getParentIndex() ).toString().equals( parentElement );
 
         return isParent;
     }
 }