textcompoutputstream.java

java高级使用教程 全书一共分六章

// TextcompOutputStream - use a TextComponent as the sink of an OutputStream
//
// Copyright (C)1996,1998 by Jef Poskanzer <[e-mail]>.  All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// Visit the ACME Labs Java page for up-to-date versions of this and other
// fine Java utilities: http://www.acme.com/java/

package Acme;

import java.io.*;
import java.awt.*;

/// Use a TextComponent as the sink of an OutputStream.
// <P>
// When you write to this OutputStream, the text appears in the
// associated TextComponent.
// <P>
// <A HREF="/resources/classes/Acme/TextcompOutputStream.java">Fetch the software.</A><BR>
// <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>
// <P>
// @see TextcompInputStream

public class TextcompOutputStream extends OutputStream
    {

    // It would be nice if TextComponent had an append() method,
    // but we can check whether it's a TextArea and use that class's
    // append().

    TextComponent textComponent = null;
    TextArea textArea = null;
    StringBuffer buf = null;

    public TextcompOutputStream( TextComponent textComponent )
	{
	if ( textComponent instanceof TextArea )
	    textArea = (TextArea) textComponent;
	else
	    {
	    this.textComponent = textComponent;
	    buf = new StringBuffer();
	    }
	textComponent.setText( "" );
	}

    public void write( int i ) throws IOException
	{
	if ( textArea != null )
	    textArea.appendText( ( new Character( (char) i ) ).toString() );
	    // textArea.append( ( new Character( (char) i ) ).toString() );
	    // (There isn't a static toString( char ) method.)
	else
	    {
	    buf.append( (char) i );
	    textComponent.setText( buf.toString() );
	    }
	}

    public void write( byte[] b ) throws IOException
	{
	if ( textArea != null )
	    textArea.appendText( new String( b ) );
	    // textArea.append( new String( b ) );
	else
	    {
	    buf.append( new String( b ) );
	    textComponent.setText( buf.toString() );
	    }
	}

    public void write( byte[] b, int off, int len ) throws IOException
	{
	if ( textArea != null )
	    textArea.appendText( new String( b, off, len ) );
	    // textArea.append( new String( b, off, len ) );
	else
	    {
	    buf.append( new String( b, off, len ) );
	    textComponent.setText( buf.toString() );
	    }
	}

    public String toString()
	{
	return textComponent.getText();
	}

    }