package org.apache.maven.doxia.module.apt;

 /*

  * 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.IOException;

 import java.io.LineNumberReader;

 import java.io.Reader;

 import org.codehaus.plexus.util.IOUtil;

 /**

  * Reader for apt source documents.

  *

  * @version $Id: AptReaderSource.java 746982 2009-02-23 12:25:50Z vsiveton $

  */

 public class AptReaderSource

     implements AptSource

 {

     /** A reader. */

     private LineNumberReader reader;

     /** lineNumber. */

     private int lineNumber;

     /**

      * Constructor: intialize reader.

      *

      * @param in the reader.

      */

     public AptReaderSource( Reader in )

     {

         reader = new LineNumberReader( in );

         lineNumber = -1;

     }

     /** {@inheritDoc} */

     public String getNextLine()

         throws AptParseException

     {

         if ( reader == null )

         {

             return null;

         }

         String line;

         try

         {

             line = reader.readLine();

             if ( line == null )

             {

                 reader.close();

                 reader = null;

             }

             else

             {

                 lineNumber = reader.getLineNumber();

             }

         }

         catch ( IOException e )

         {

             // TODO handle column number

             throw new AptParseException( "IOException: " + e.getMessage(), e, lineNumber, -1 );

         }

         return line;

     }

     /** {@inheritDoc} */

     public String getName()

     {

         return "";

     }

     /** {@inheritDoc} */

     public int getLineNumber()

     {

         return lineNumber;

     }

     /**

      * Closes the reader associated with this AptReaderSource.

      */

     public void close()

     {

         IOUtil.close( reader );

         reader = null;

     }

 }