package org.apache.maven.doxia.logging;
   
   /*
    * 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.PrintWriter;
  import java.io.StringWriter;
  
  /**
   * Logger with "standard" output and error output stream. The log prefix is voluntarily in lower case.
   * <br>
   * Based on <code>org.apache.maven.plugin.logging.SystemStreamLog</code>.
   *
   * @author jdcasey
   * @author ltheussl
   * @since 1.1
   */
  public class SystemStreamLog
      implements Log
  {
      private static final String EOL = System.getProperty( "line.separator" );
  
      private int currentLevel = LEVEL_INFO;
  
      /** {@inheritDoc} */
      public void setLogLevel( int level )
      {
          if ( level <= LEVEL_DEBUG )
          {
              currentLevel = LEVEL_DEBUG;
          }
          else if ( level <= LEVEL_INFO )
          {
              currentLevel = LEVEL_INFO;
          }
          else if ( level <= LEVEL_WARN )
          {
              currentLevel = LEVEL_WARN;
          }
          else if ( level <= LEVEL_ERROR )
          {
              currentLevel = LEVEL_ERROR;
          }
          else
          {
              currentLevel = LEVEL_DISABLED;
          }
      }
  
      /**
       * {@inheritDoc}
       *
       * @param content a {@link java.lang.CharSequence} object.
       */
      public void debug( CharSequence content )
      {
          if ( isDebugEnabled() )
          {
              print( "debug", content );
          }
      }
  
      /** {@inheritDoc} */
      public void debug( CharSequence content, Throwable error )
      {
          if ( isDebugEnabled() )
          {
              print( "debug", content, error );
          }
      }
  
      /** {@inheritDoc} */
      public void debug( Throwable error )
      {
          if ( isDebugEnabled() )
          {
              print( "debug", error );
          }
      }
  
      /** {@inheritDoc} */
      public void info( CharSequence content )
      {
         if ( isInfoEnabled() )
         {
             print( "info", content );
         }
     }
 
     /** {@inheritDoc} */
     public void info( CharSequence content, Throwable error )
     {
         if ( isInfoEnabled() )
         {
             print( "info", content, error );
         }
     }
 
     /**
      * {@inheritDoc}
      *
      * @param error a {@link java.lang.Throwable} object.
      */
     public void info( Throwable error )
     {
         if ( isInfoEnabled() )
         {
             print( "info", error );
         }
     }
 
     /**
      * {@inheritDoc}
      *
      * @param content a {@link java.lang.CharSequence} object.
      */
     public void warn( CharSequence content )
     {
         if ( isWarnEnabled() )
         {
             print( "warn", content );
         }
     }
 
     /** {@inheritDoc} */
     public void warn( CharSequence content, Throwable error )
     {
         if ( isWarnEnabled() )
         {
             print( "warn", content, error );
         }
     }
 
     /** {@inheritDoc} */
     public void warn( Throwable error )
     {
         if ( isWarnEnabled() )
         {
             print( "warn", error );
         }
     }
 
     /** {@inheritDoc} */
     public void error( CharSequence content )
     {
         if ( isErrorEnabled() )
         {
             System.err.println( "[error] " + content.toString() );
         }
     }
 
     /** {@inheritDoc} */
     public void error( CharSequence content, Throwable error )
     {
         if ( isErrorEnabled() )
         {
             StringWriter sWriter = new StringWriter();
             PrintWriter pWriter = new PrintWriter( sWriter );
 
             error.printStackTrace( pWriter );
 
             System.err.println( "[error] " + content.toString()
                 + EOL + EOL + sWriter.toString() );
         }
     }
 
     /**
      * {@inheritDoc}
      *
      * @param error a {@link java.lang.Throwable} object.
      */
     public void error( Throwable error )
     {
         if ( isErrorEnabled() )
         {
             StringWriter sWriter = new StringWriter();
             PrintWriter pWriter = new PrintWriter( sWriter );
 
             error.printStackTrace( pWriter );
 
             System.err.println( "[error] " + sWriter.toString() );
         }
     }
 
     /**
      * {@inheritDoc}
      *
      * @return a boolean.
      */
     public boolean isDebugEnabled()
     {
         return ( currentLevel <= LEVEL_DEBUG );
     }
 
     /**
      * {@inheritDoc}
      *
      * @return a boolean.
      */
     public boolean isInfoEnabled()
     {
         return ( currentLevel <= LEVEL_INFO );
     }
 
     /**
      * {@inheritDoc}
      *
      * @return a boolean.
      */
     public boolean isWarnEnabled()
     {
         return ( currentLevel <= LEVEL_WARN );
     }
 
     /**
      * {@inheritDoc}
      *
      * @return a boolean.
      */
     public boolean isErrorEnabled()
     {
         return ( currentLevel <= LEVEL_ERROR );
     }
 
       //
      // private
     //
 
     private void print( String prefix, CharSequence content )
     {
         System.out.println( "[" + prefix + "] " + content.toString() );
     }
 
     private void print( String prefix, Throwable error )
     {
         StringWriter sWriter = new StringWriter();
         PrintWriter pWriter = new PrintWriter( sWriter );
 
         error.printStackTrace( pWriter );
 
         System.out.println( "[" + prefix + "] " + sWriter.toString() );
     }
 
     private void print( String prefix, CharSequence content, Throwable error )
     {
         StringWriter sWriter = new StringWriter();
         PrintWriter pWriter = new PrintWriter( sWriter );
 
         error.printStackTrace( pWriter );
 
         System.out.println( "[" + prefix + "] " + content.toString()
             + EOL + EOL + sWriter.toString() );
     }
 }