package textbender.g.io; // Copyright 2005, Michael Allan.  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Textbender Software"), to deal in the Textbender Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Textbender Software, and to permit persons to whom the Textbender Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Textbender Software. THE TEXTBENDER SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE TEXTBENDER SOFTWARE OR THE USE OR OTHER DEALINGS IN THE TEXTBENDER SOFTWARE.

import java.io.*;


/** A writer that passes all requests to an underlying writer.
  */
public final class WriterSwitch extends Writer // never tested
{

    /** Returns the underlying writer, to which all requests are passed.
      * Initially it is null, and no requests are passed at all.
      */
    public Writer getWriter() { return writer; }


        private Writer writer = null;


        /** Sets the underlying writer, per {@linkplain #getWriter() getWriter}().
          */
        public void setWriter( Writer writer ) { this.writer = writer; }



   // - W r i t e r ----------------------------------------------------------------------


    public void close() throws IOException { if( writer != null ) writer.close(); }

    public void flush() throws IOException { if( writer != null ) writer.flush(); }

    public void write( char[] cbuf ) throws IOException { if( writer != null ) writer.write( cbuf ); }

    public void write( char[] cbuf, int off, int len ) throws IOException { if( writer != null ) writer.write( cbuf, off, len ); }

    public void write( int c ) throws IOException { if( writer != null ) writer.write( c ); }

    public void write( String str, int off, int len ) throws IOException { if( writer != null ) writer.write( str, off, len ); }

    public void write( String str ) throws IOException { if( writer != null ) writer.write( str ); }



}