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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
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*/
package org.glassfish.admin.rest.logviewer;
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.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}.
*
*
* 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 Charset.forName("UTF-8");
}
}
}