AppendableWriter.java

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/*
 * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
 * Copyright (C) 2012 - Javolution (http://javolution.org/)
 * All rights reserved.
 * 
 * Permission to use, copy, modify, and distribute this software is
 * freely granted, provided that this notice is preserved.
 */
package javolution.io;
 
import java.io.IOException;
import java.io.Writer;
import javolution.text.Text;
 
public final class AppendableWriter extends Writer {
 
    private Appendable _output;
 
    public AppendableWriter() {}
 
    public AppendableWriter setOutput(Appendable output) {
        if (_output != null)
            throw new IllegalStateException("Writer not closed or reset");
        _output = output;
        return this;
    }
 
    public void write(char c) throws IOException {
        if (_output == null)
            throw new IOException("Writer closed");
        _output.append(c);
    }
 
    public void write(int c) throws IOException {
        if (_output == null)
            throw new IOException("Writer closed");
        _output.append((char) c);
    }
 
    public void write(char cbuf[], int off, int len) throws IOException {
        if (_output == null)
            throw new IOException("Writer closed");
        _tmpBuffer = cbuf;
        _output.append(_tmpBufferAsCharSequence, off, off + len);
        _tmpBuffer = null; // Removes temporary references.
    }
 
    private char[] _tmpBuffer;
 
    private final CharSequence _tmpBufferAsCharSequence = new CharSequence() {
        public int length() {
            return _tmpBuffer.length;
        }
 
        public char charAt(int index) {
            return _tmpBuffer[index];
        }
 
        public CharSequence subSequence(int start, int end) {
            throw new UnsupportedOperationException();
        }
    };
 
    public void write(String str, int off, int len) throws IOException {
        if (_output == null)
            throw new IOException("Writer closed");
        Object obj = str;
        if (obj instanceof CharSequence) {
            _output.append((CharSequence) obj);
        } else {
            _output.append(Text.valueOf(str));
        }
    }
 
    public void write(CharSequence csq) throws IOException {
        if (_output == null)
            throw new IOException("Writer closed");
        _output.append(csq);
    }
 
    public void flush() {
        // Do nothing (no buffer).
    }
 
    public void close() {
        if (_output != null) {
            reset();
        }
    }
 
    public void reset() {
        _output = null;
        _tmpBuffer = null;
    }
}