org.apache.thrift.protocol.TTupleProtocol Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.thrift.protocol;
import java.util.BitSet;
import org.apache.thrift.TException;
import org.apache.thrift.scheme.IScheme;
import org.apache.thrift.scheme.TupleScheme;
import org.apache.thrift.transport.TTransport;
public final class TTupleProtocol extends TCompactProtocol {
public static class Factory implements TProtocolFactory {
public Factory() {}
public TProtocol getProtocol(TTransport trans) {
return new TTupleProtocol(trans);
}
}
public TTupleProtocol(TTransport transport) {
super(transport);
}
@Override
public Class getScheme() {
return TupleScheme.class;
}
public void writeBitSet(BitSet bs, int vectorWidth) throws TException {
byte[] bytes = toByteArray(bs, vectorWidth);
for (byte b : bytes) {
writeByte(b);
}
}
public BitSet readBitSet(int i) throws TException {
int length = (int) Math.ceil(i/8.0);
byte[] bytes = new byte[length];
for (int j = 0; j < length; j++) {
bytes[j] = readByte();
}
BitSet bs = fromByteArray(bytes);
return bs;
}
/**
* Returns a bitset containing the values in bytes. The byte-ordering must be
* big-endian.
*/
public static BitSet fromByteArray(byte[] bytes) {
BitSet bits = new BitSet();
for (int i = 0; i < bytes.length * 8; i++) {
if ((bytes[bytes.length - i / 8 - 1] & (1 << (i % 8))) > 0) {
bits.set(i);
}
}
return bits;
}
/**
* Returns a byte array of at least length 1. The most significant bit in the
* result is guaranteed not to be a 1 (since BitSet does not support sign
* extension). The byte-ordering of the result is big-endian which means the
* most significant bit is in element 0. The bit at index 0 of the bit set is
* assumed to be the least significant bit.
*
* @param bits
* @param vectorWidth
* @return a byte array of at least length 1
*/
public static byte[] toByteArray(BitSet bits, int vectorWidth) {
byte[] bytes = new byte[(int) Math.ceil(vectorWidth/8.0)];
for (int i = 0; i < bits.length(); i++) {
if (bits.get(i)) {
bytes[bytes.length - i / 8 - 1] |= 1 << (i % 8);
}
}
return bytes;
}
}