apache-mime4j-0.6/src/main/java/org/apache/james/mime4j/codec/QuotedPrintableOutputStream.java

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 * 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   *
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
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package org.apache.james.mime4j.codec;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Performs Quoted-Printable encoding on an underlying stream.
 */
public class QuotedPrintableOutputStream extends FilterOutputStream {
    
    private QuotedPrintableEncoder encoder;
    private boolean closed = false;

    public QuotedPrintableOutputStream(OutputStream out, boolean binary) {
        super(out);
        encoder = new QuotedPrintableEncoder(CodecUtil.DEFAULT_ENCODING_BUFFER_SIZE, binary);
        encoder.initEncoding(out);
    }

    @Override
    public void close() throws IOException {
        if (closed)
            return;

        try {
            encoder.completeEncoding();
            // do not close the wrapped stream
        } finally {
            closed = true;
        }
    }

    @Override
    public void flush() throws IOException {
        encoder.flushOutput();
    }

    @Override
    public void write(int b) throws IOException {
        this.write(new byte[] { (byte) b }, 0, 1);
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        if (closed) {
            throw new IOException("QuotedPrintableOutputStream has been closed");
        }

        encoder.encodeChunk(b, off, len);
    }

}