package org.apache.maven.cli;
   
   /*
    * 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.PrintStream;
  
  import org.apache.maven.Maven;
  import org.codehaus.plexus.logging.AbstractLogger;
  import org.codehaus.plexus.logging.Logger;
  
  /**
   * Logs to a user-supplied {@link PrintStream}.
   * 
   * @author Benjamin Bentmann
   */
  public class PrintStreamLogger
      extends AbstractLogger
  {
  
      static interface Provider
      {
          PrintStream getStream();
      }
  
      private Provider provider;
  
      private static final String FATAL_ERROR = "[FATAL] ";
  
      private static final String ERROR = "[ERROR] ";
  
      private static final String WARNING = "[WARNING] ";
  
      private static final String INFO = "[INFO] ";
  
      private static final String DEBUG = "[DEBUG] ";
  
      public PrintStreamLogger( Provider provider )
      {
          super( Logger.LEVEL_INFO, Maven.class.getName() );
  
          if ( provider == null )
          {
              throw new IllegalArgumentException( "output stream provider missing" );
          }
          this.provider = provider;
      }
  
      public PrintStreamLogger( PrintStream out )
      {
          super( Logger.LEVEL_INFO, Maven.class.getName() );
  
          setStream( out );
      }
  
      public void setStream( final PrintStream out )
      {
          if ( out == null )
          {
              throw new IllegalArgumentException( "output stream missing" );
          }
  
          this.provider = new Provider()
          {
              public PrintStream getStream()
              {
                  return out;
              }
          };
      }
  
      public void debug( String message, Throwable throwable )
      {
          if ( isDebugEnabled() )
          {
              PrintStream out = provider.getStream();
  
              out.print( DEBUG );
              out.println( message );
  
              if ( null != throwable )
              {
                  throwable.printStackTrace( out );
             }
         }
     }
 
     public void info( String message, Throwable throwable )
     {
         if ( isInfoEnabled() )
         {
             PrintStream out = provider.getStream();
 
             out.print( INFO );
             out.println( message );
 
             if ( null != throwable )
             {
                 throwable.printStackTrace( out );
             }
         }
     }
 
     public void warn( String message, Throwable throwable )
     {
         if ( isWarnEnabled() )
         {
             PrintStream out = provider.getStream();
 
             out.print( WARNING );
             out.println( message );
 
             if ( null != throwable )
             {
                 throwable.printStackTrace( out );
             }
         }
     }
 
     public void error( String message, Throwable throwable )
     {
         if ( isErrorEnabled() )
         {
             PrintStream out = provider.getStream();
 
             out.print( ERROR );
             out.println( message );
 
             if ( null != throwable )
             {
                 throwable.printStackTrace( out );
             }
         }
     }
 
     public void fatalError( String message, Throwable throwable )
     {
         if ( isFatalErrorEnabled() )
         {
             PrintStream out = provider.getStream();
 
             out.print( FATAL_ERROR );
             out.println( message );
 
             if ( null != throwable )
             {
                 throwable.printStackTrace( out );
             }
         }
     }
 
     public void close()
     {
         PrintStream out = provider.getStream();
 
         if ( out == System.out || out == System.err )
         {
             out.flush();
         }
         else
         {
             out.close();
         }
     }
 
     public Logger getChildLogger( String arg0 )
     {
         return this;
     }
 
 }