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package org.apache.thrift.transport;
import java.nio.BufferOverflowException;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import org.apache.thrift.TConfiguration;
/** ByteBuffer-backed implementation of TTransport. */
public final class TByteBuffer extends TEndpointTransport {
private final ByteBuffer byteBuffer;
/**
* Creates a new TByteBuffer wrapping a given NIO ByteBuffer.
*
* @param byteBuffer the NIO ByteBuffer to wrap.
* @throws TTransportException on error.
*/
public TByteBuffer(ByteBuffer byteBuffer) throws TTransportException {
super(new TConfiguration());
this.byteBuffer = byteBuffer;
updateKnownMessageSize(byteBuffer.capacity());
}
@Override
public boolean isOpen() {
return true;
}
@Override
public void open() {}
@Override
public void close() {}
@Override
public int read(byte[] buf, int off, int len) throws TTransportException {
//
checkReadBytesAvailable(len);
final int n = Math.min(byteBuffer.remaining(), len);
if (n > 0) {
try {
byteBuffer.get(buf, off, n);
} catch (BufferUnderflowException e) {
throw new TTransportException("Unexpected end of input buffer", e);
}
}
return n;
}
@Override
public void write(byte[] buf, int off, int len) throws TTransportException {
try {
byteBuffer.put(buf, off, len);
} catch (BufferOverflowException e) {
throw new TTransportException("Not enough room in output buffer", e);
}
}
/**
* Gets the underlying NIO ByteBuffer.
*
* @return the underlying NIO ByteBuffer.
*/
public ByteBuffer getByteBuffer() {
return byteBuffer;
}
/**
* Convenience method to call clear() on the underlying NIO ByteBuffer.
*
* @return this instance.
*/
public TByteBuffer clear() {
byteBuffer.clear();
return this;
}
/**
* Convenience method to call flip() on the underlying NIO ByteBuffer.
*
* @return this instance.
*/
public TByteBuffer flip() {
byteBuffer.flip();
return this;
}
/**
* Convenience method to convert the underlying NIO ByteBuffer to a plain old byte array.
*
* @return the byte array backing the underlying NIO ByteBuffer.
*/
public byte[] toByteArray() {
final byte[] data = new byte[byteBuffer.remaining()];
byteBuffer.slice().get(data);
return data;
}
}
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