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package com.sun.grizzly.util.buf;
import com.sun.grizzly.util.LoggerUtils;
import com.sun.grizzly.util.Utils;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CoderResult;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CodingErrorAction;
import java.util.logging.Level;
import java.util.logging.Logger;
/** Efficient conversion of character to bytes.
*
* Now uses NIO directly
*/
public class C2BConverter {
private static final Logger logger = LoggerUtils.getLogger();
protected ByteChunk bb;
protected String enc;
protected CharsetEncoder encoder;
/** Create a converter, with bytes going to a byte buffer
*/
public C2BConverter(ByteChunk output, String encoding) throws IOException {
this.bb=output;
this.enc=encoding;
encoder = Utils.lookupCharset(enc).newEncoder().
onMalformedInput(CodingErrorAction.REPLACE).
onUnmappableCharacter(CodingErrorAction.REPLACE);
}
/** Create a converter
*/
public C2BConverter(String encoding) throws IOException {
this( new ByteChunk(1024), encoding );
}
public static C2BConverter getInstance(ByteChunk output, String encoding) throws IOException {
return new C2BConverter(output, encoding);
}
public ByteChunk getByteChunk() {
return bb;
}
public String getEncoding() {
return enc;
}
public void setByteChunk(ByteChunk bb) {
this.bb=bb;
}
/** Reset the internal state, empty the buffers.
* The encoding remain in effect, the internal buffers remain allocated.
*/
public void recycle() {
bb.recycle();
}
/** Generate the bytes using the specified encoding
*/
public void convert(char c[], int off, int len) throws IOException {
CharBuffer cb = CharBuffer.wrap(c, off, len);
byte[] barr = bb.getBuffer();
int boff = bb.getEnd();
ByteBuffer tmp = ByteBuffer.wrap(barr, boff, barr.length - boff);
CoderResult cr = encoder.encode(cb, tmp, true);
bb.setEnd(tmp.position());
while (cr == CoderResult.OVERFLOW) {
if (!bb.canGrow())
bb.flushBuffer();
boff = bb.getEnd();
barr = bb.getBuffer();
tmp = ByteBuffer.wrap(barr, boff, barr.length - boff);
cr = encoder.encode(cb, tmp, true);
bb.setEnd(tmp.position());
}
if (cr != CoderResult.UNDERFLOW) {
throw new IOException("Encoding error");
}
}
/** Generate the bytes using the specified encoding
*/
public void convert(String s ) throws IOException {
convert(s, 0, s.length());
}
/** Generate the bytes using the specified encoding
*/
public void convert(String s, int off, int len ) throws IOException {
convert(s.toCharArray(), off, len);
}
/** Generate the bytes using the specified encoding
*/
public void convert(char c ) throws IOException {
char[] tmp = new char[1];
tmp[0] = c;
convert(tmp, 0, 1);
}
/** Convert a message bytes chars to bytes
*/
public void convert(MessageBytes mb ) throws IOException {
int type=mb.getType();
if( type==MessageBytes.T_BYTES )
return;
ByteChunk orig=bb;
setByteChunk( mb.getByteChunk());
bb.recycle();
bb.allocate( 32, -1 );
if( type==MessageBytes.T_STR ) {
convert( mb.getString() );
// System.out.println("XXX Converting " + mb.getString() );
} else if( type==MessageBytes.T_CHARS ) {
CharChunk charC=mb.getCharChunk();
convert( charC.getBuffer(),
charC.getOffset(), charC.getLength());
//System.out.println("XXX Converting " + mb.getCharChunk() );
} else {
if (logger.isLoggable(Level.FINE)){
logger.fine("XXX unknowon type " + type );
}
}
//System.out.println("C2B: XXX " + bb.getBuffer() + bb.getLength());
setByteChunk(orig);
}
/** Flush any internal buffers into the ByteOutput or the internal
* byte[]
*/
public void flushBuffer() throws IOException {
bb.flushBuffer();
}
}