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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.io;
import com.yahoo.text.GenericWriter;
import com.yahoo.text.AbstractUtf8Array;
import com.yahoo.text.Utf8;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
/**
* Base class for writers needing to accept binary data.
*
* @author Steinar Knutsen
* @author baldersheim
*/
public abstract class AbstractByteWriter extends GenericWriter implements WritableByteTransmitter {
protected final CharsetEncoder encoder;
protected final BufferChain buffer;
protected final CharBuffer charBuffer = CharBuffer.allocate(2);
protected AbstractByteWriter(final CharsetEncoder encoder) {
this.encoder = encoder;
buffer = new BufferChain(this);
}
/** Returns the charset this encodes its output in */
public Charset getEncoding() {
return encoder.charset();
}
@Override
public GenericWriter write(AbstractUtf8Array v) throws java.io.IOException {
buffer.append(v);
return this;
}
@Override
public GenericWriter write(long v) throws java.io.IOException {
buffer.append(Utf8.toAsciiBytes(v));
return this;
}
/**
* Do note, if writing the first character of a surrogate pair, the next
* character written must be the second part of the pair. If this is not the
* case, the surrogate will be omitted from output.
*/
@Override
public void write(int v) throws java.io.IOException {
char c = (char) v;
if (Character.isSurrogate(c)) {
charBuffer.append(c);
if (!charBuffer.hasRemaining()) {
charBuffer.flip();
buffer.append(charBuffer, encoder);
charBuffer.clear();
}
} else {
charBuffer.clear(); // to nuke misplaced singleton surrogates
charBuffer.append((char) v);
charBuffer.flip();
buffer.append(charBuffer, encoder);
charBuffer.clear();
}
}
@Override
public GenericWriter write(double v) throws java.io.IOException {
buffer.append(Utf8.toBytes(String.valueOf(v)));
return this;
}
@Override
public GenericWriter write(float v) throws java.io.IOException {
buffer.append(Utf8.toBytes(String.valueOf(v)));
return this;
}
@Override
public GenericWriter write(short v) throws java.io.IOException {
buffer.append(Utf8.toAsciiBytes(v));
return this;
}
@Override
public GenericWriter write(boolean v) throws java.io.IOException {
buffer.append(Utf8.toAsciiBytes(v));
return this;
}
@Override
public void write(final char[] cbuf, final int offset, final int len)
throws java.io.IOException {
final CharBuffer in = CharBuffer.wrap(cbuf, offset, len);
buffer.append(in, encoder);
}
public void append(final ByteBuffer alreadyEncoded)
throws java.io.IOException {
buffer.append(alreadyEncoded);
}
public void append(final byte alreadyEncoded) throws java.io.IOException {
buffer.append(alreadyEncoded);
}
public void append(final byte[] alreadyEncoded) throws java.io.IOException {
buffer.append(alreadyEncoded);
}
public void append(final byte[] alreadyEncoded, final int offset,
final int length) throws java.io.IOException {
buffer.append(alreadyEncoded, offset, length);
}
/**
* Return the number of bytes this writer will produce for the underlying
* layer. That is, it sums the length of the raw bytes received and the
* number of bytes in the written strings after encoding.
*
* @return the number of bytes appended to this writer
*/
public long appended() {
return buffer.appended();
}
}
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