/
WriterOutputStream.java
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/
WriterOutputStream.java
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/*
* Copyright (c) 2004-2010, Kohsuke Kawaguchi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided
* that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* * 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
package org.kohsuke.stapler.framework.io;
import java.io.OutputStream;
import java.io.Writer;
import java.io.IOException;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import java.nio.charset.CoderResult;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.charset.UnsupportedCharsetException;
import java.nio.*;
import java.nio.ByteBuffer;
/**
* {@link OutputStream} that writes to {@link Writer}
* by assuming the platform default encoding.
*
* @author Kohsuke Kawaguchi
*/
public class WriterOutputStream extends OutputStream {
private final Writer writer;
private final CharsetDecoder decoder;
private java.nio.ByteBuffer buf = ByteBuffer.allocate(1024);
private CharBuffer out = CharBuffer.allocate(1024);
public WriterOutputStream(Writer out, Charset charset) {
this.writer = out;
decoder = charset.newDecoder();
decoder.onMalformedInput(CodingErrorAction.REPLACE);
decoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
}
public WriterOutputStream(Writer out) {
this(out,DEFAULT_CHARSET);
}
@Override
public void write(int b) throws IOException {
if(buf.remaining()==0)
decode(false);
buf.put((byte)b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
while(len>0) {
if(buf.remaining()==0)
decode(false);
int sz = Math.min(buf.remaining(),len);
buf.put(b,off,sz);
off += sz;
len -= sz;
}
}
@Override
public void flush() throws IOException {
decode(false);
flushOutput();
writer.flush();
}
private void flushOutput() throws IOException {
writer.write(out.array(),0,out.position());
out.clear();
}
@Override
public void close() throws IOException {
decode(true);
flushOutput();
writer.close();
buf.rewind();
}
/**
* Decodes the contents of {@link #buf} as much as possible to {@link #out}.
* If necessary {@link #out} is further sent to {@link #writer}.
*
* <p>
* When this method returns, the {@link #buf} is back to the 'accumulation'
* mode.
*
* @param last
* if true, tell the decoder that all the input bytes are ready.
*/
private void decode(boolean last) throws IOException {
buf.flip();
while(true) {
CoderResult r = decoder.decode(buf, out, last);
if(r==CoderResult.OVERFLOW) {
flushOutput();
continue;
}
if(r==CoderResult.UNDERFLOW) {
buf.compact();
return;
}
// otherwise treat it as an error
r.throwException();
}
}
private static final Charset DEFAULT_CHARSET = getDefaultCharset();
private static Charset getDefaultCharset() {
try {
String encoding = System.getProperty("file.encoding");
return Charset.forName(encoding);
} catch (UnsupportedCharsetException e) {
return StandardCharsets.UTF_8;
}
}
}