src/org/objectweb/cjdbc/console/gui/jtools/JTextAreaWriter.java

説明を見る。

package org.objectweb.cjdbc.console.gui.jtools;

import java.io.IOException;
import java.io.Writer;

import javax.swing.JTextArea;

public class JTextAreaWriter extends Writer
{

  private boolean      closed = false;
  private JTextArea    textArea;
  private StringBuffer buffer;

  public JTextAreaWriter(JTextArea textArea)
  {
    setTextArea(textArea);
  }

  public void setTextArea(JTextArea textArea)
  {
    if (textArea == null)
    {
      throw new IllegalArgumentException("The text area must not be null.");
    }
    this.textArea = textArea;
  }

  public void close()
  {
    closed = true;
  }

  public void flush() throws IOException
  {
    if (closed)
    {
      throw new IOException("The stream is closed.");
    }
    textArea.append(getBuffer().toString());
    textArea.setCaretPosition(textArea.getDocument().getLength());
    buffer = null;
  }

  public void write(char[] charArray) throws IOException
  {
    write(charArray, 0, charArray.length);
  }

  public void write(char[] charArray, int offset, int length)
      throws IOException 
  {
    if (closed)
    {
      throw new IOException("The stream is not open.");
    }
    getBuffer().append(charArray, offset, length);
  }

  public void write(int c) throws IOException
  {
    if (closed)
    {
      throw new IOException("The stream is not open.");
    }
    getBuffer().append((char) c);
  }

  public void write(String string) throws IOException
  {
    if (closed)
    {
      throw new IOException("The stream is not open.");
    }
    getBuffer().append(string);
  }

  public void write(String string, int offset, int length) throws IOException
  {
    if (closed)
    {
      throw new IOException("The stream is not open.");
    }
    getBuffer().append(string.substring(offset, length));
  }

  private StringBuffer getBuffer()
  {
    if (buffer == null)
    {
      buffer = new StringBuffer();
    }
    return buffer;
  }

}

---