package org.apache.maven.plugins.pdf;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.

  */

 import java.io.File;

 import java.io.IOException;

 import java.io.Reader;

 import java.io.StringReader;

 import java.util.Properties;

 import org.apache.maven.doxia.document.DocumentModel;

 import org.apache.maven.doxia.document.io.xpp3.DocumentXpp3Reader;

 import org.apache.maven.plugin.logging.Log;

 import org.apache.maven.project.MavenProject;

 import org.codehaus.plexus.interpolation.EnvarBasedValueSource;

 import org.codehaus.plexus.interpolation.InterpolationException;

 import org.codehaus.plexus.interpolation.Interpolator;

 import org.codehaus.plexus.interpolation.MapBasedValueSource;

 import org.codehaus.plexus.interpolation.ObjectBasedValueSource;

 import org.codehaus.plexus.interpolation.RegexBasedInterpolator;

 import org.codehaus.plexus.util.IOUtil;

 import org.codehaus.plexus.util.ReaderFactory;

 import org.codehaus.plexus.util.introspection.ReflectionValueExtractor;

 import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

 /**

  * Read and filter a DocumentModel from a document descriptor file.

  *

  * @author ltheussl

  * @version $Id: DocumentDescriptorReader.java 787005 2009-06-21 12:54:41Z ltheussl $

  */

 public class DocumentDescriptorReader

 {

     /** A MavenProject to extract additional info. */

     private final MavenProject project;

     /** Used to log the interpolated document descriptor. */

     private final Log log;

     /**

      * Constructor.

      */

     public DocumentDescriptorReader()

     {

         this( null, null );

     }

     /**

      * Constructor.

      *

      * @param project may be null.

      */

     public DocumentDescriptorReader( final MavenProject project )

     {

         this( project, null );

     }

     /**

      * Constructor.

      *

      * @param project may be null.

      * @param log may be null.

      */

     public DocumentDescriptorReader( final MavenProject project, final Log log )

     {

         this.project = project;

         this.log = log;

     }

     /**

      * Read and filter the <code>docDescriptor</code> file.

      *

      * @param docDescriptor not null.

      * @return a DocumentModel instance.

      * @throws XmlPullParserException if an error occurs during parsing.

      * @throws IOException if an error occurs during reading.

      */

     public DocumentModel readAndFilterDocumentDescriptor( final File docDescriptor )

         throws XmlPullParserException, IOException

     {

         Reader reader = null;

         try

         {

             // System properties

             final Properties filterProperties = System.getProperties();

             // Project properties

             if ( project != null && project.getProperties() != null )

             {

                 filterProperties.putAll( project.getProperties() );

             }

             final Interpolator interpolator = new RegexBasedInterpolator();

             interpolator.addValueSource( new MapBasedValueSource( filterProperties ) );

             interpolator.addValueSource( new EnvarBasedValueSource() );

             interpolator.addValueSource( new ObjectBasedValueSource( project )

             {

                 /** {@inheritDoc} */

                 public Object getValue( final String expression )

                 {

                     try

                     {

                         return ReflectionValueExtractor.evaluate( expression, project );

                     }

                     catch ( Exception e )

                     {

                         addFeedback( "Failed to extract \'" + expression + "\' from: " + project, e );

                     }

                     return null;

                 }

             } );

             final DateBean bean = new DateBean();

             interpolator.addValueSource( new ObjectBasedValueSource( bean ) );

             reader = ReaderFactory.newXmlReader( docDescriptor );

             final String interpolatedDoc = interpolator.interpolate( IOUtil.toString( reader ) );

             if ( log != null && log.isDebugEnabled() )

             {

                 log.debug( "Interpolated document descriptor ("

                         + docDescriptor.getAbsolutePath() + ")\n" + interpolatedDoc );

             }

             // No Strict

             return new DocumentXpp3Reader().read( new StringReader( interpolatedDoc ), false );

         }

         catch ( InterpolationException e )

         {

             final IOException io = new IOException( "Error interpolating document descriptor" );

             io.initCause( e );

             throw io;

         }

         finally

         {

             IOUtil.close( reader );

         }

     }

 }