Author: henrique
Date: Wed Oct 3 09:26:32 2012
New Revision: 1393370
URL: http://svn.apache.org/viewvc?rev=1393370&view=rev
Log:
Thrift-336: Compact Protocol in C#
Patch: Henrique Mendonça
Added:
thrift/trunk/lib/csharp/src/Protocol/TCompactProtocol.cs
Added: thrift/trunk/lib/csharp/src/Protocol/TCompactProtocol.cs
URL:
http://svn.apache.org/viewvc/thrift/trunk/lib/csharp/src/Protocol/TCompactProtocol.cs?rev=1393370&view=auto
==============================================================================
--- thrift/trunk/lib/csharp/src/Protocol/TCompactProtocol.cs (added)
+++ thrift/trunk/lib/csharp/src/Protocol/TCompactProtocol.cs Wed Oct 3
09:26:32 2012
@@ -0,0 +1,850 @@
+/**
+ * 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.
+ *
+ * Contains some contributions under the Thrift Software License.
+ * Please see doc/old-thrift-license.txt in the Thrift distribution for
+ * details.
+ */
+
+using System;
+using System.Text;
+using Thrift.Transport;
+using System.Collections;
+using System.IO;
+using System.Collections.Generic;
+
+namespace Thrift.Protocol
+{
+ public class TCompactProtocol : TProtocol
+ {
+ private static TStruct ANONYMOUS_STRUCT = new TStruct("");
+ private static TField TSTOP = new TField("", TType.Stop, (short)0);
+
+ private static byte[] ttypeToCompactType = new byte[16];
+
+ private const byte PROTOCOL_ID = 0x82;
+ private const byte VERSION = 1;
+ private const byte VERSION_MASK = 0x1f; // 0001 1111
+ private const byte TYPE_MASK = 0xE0; // 1110 0000
+ private const int TYPE_SHIFT_AMOUNT = 5;
+
+ /**
+ * All of the on-wire type codes.
+ */
+ private static class Types
+ {
+ public const byte STOP = 0x00;
+ public const byte BOOLEAN_TRUE = 0x01;
+ public const byte BOOLEAN_FALSE = 0x02;
+ public const byte BYTE = 0x03;
+ public const byte I16 = 0x04;
+ public const byte I32 = 0x05;
+ public const byte I64 = 0x06;
+ public const byte DOUBLE = 0x07;
+ public const byte BINARY = 0x08;
+ public const byte LIST = 0x09;
+ public const byte SET = 0x0A;
+ public const byte MAP = 0x0B;
+ public const byte STRUCT = 0x0C;
+ }
+
+ /**
+ * Used to keep track of the last field for the current and previous
structs,
+ * so we can do the delta stuff.
+ */
+ private Stack<short> lastField_ = new Stack<short>(15);
+
+ private short lastFieldId_ = 0;
+
+ /**
+ * If we encounter a boolean field begin, save the TField here so it
can
+ * have the value incorporated.
+ */
+ private Nullable<TField> booleanField_;
+
+ /**
+ * If we Read a field header, and it's a boolean field, save the
boolean
+ * value here so that ReadBool can use it.
+ */
+ private Nullable<Boolean> boolValue_;
+
+
+ #region CompactProtocol Factory
+
+ /**
+ * Factory
+ */
+ public class Factory : TProtocolFactory
+ {
+ public Factory() { }
+
+ public TProtocol GetProtocol(TTransport trans)
+ {
+ return new TCompactProtocol(trans);
+ }
+ }
+
+ #endregion
+
+ public TCompactProtocol(TTransport trans)
+ : base(trans)
+ {
+ ttypeToCompactType[(int)TType.Stop] = Types.STOP;
+ ttypeToCompactType[(int)TType.Bool] = Types.BOOLEAN_TRUE;
+ ttypeToCompactType[(int)TType.Byte] = Types.BYTE;
+ ttypeToCompactType[(int)TType.I16] = Types.I16;
+ ttypeToCompactType[(int)TType.I32] = Types.I32;
+ ttypeToCompactType[(int)TType.I64] = Types.I64;
+ ttypeToCompactType[(int)TType.Double] = Types.DOUBLE;
+ ttypeToCompactType[(int)TType.String] = Types.BINARY;
+ ttypeToCompactType[(int)TType.List] = Types.LIST;
+ ttypeToCompactType[(int)TType.Set] = Types.SET;
+ ttypeToCompactType[(int)TType.Map] = Types.MAP;
+ ttypeToCompactType[(int)TType.Struct] = Types.STRUCT;
+ }
+
+ public void reset()
+ {
+ lastField_.Clear();
+ lastFieldId_ = 0;
+ }
+
+ #region Write Methods
+
+
+ /**
+ * Writes a byte without any possibility of all that field header
nonsense.
+ * Used internally by other writing methods that know they need to
Write a byte.
+ */
+ private byte[] byteDirectBuffer = new byte[1];
+ private void WriteByteDirect(byte b)
+ {
+ byteDirectBuffer[0] = b;
+ trans.Write(byteDirectBuffer);
+ }
+
+ /**
+ * Writes a byte without any possibility of all that field header
nonsense.
+ */
+ private void WriteByteDirect(int n)
+ {
+ WriteByteDirect((byte)n);
+ }
+
+ /**
+ * Write an i32 as a varint. Results in 1-5 bytes on the wire.
+ * TODO: make a permanent buffer like WriteVarint64?
+ */
+ byte[] i32buf = new byte[5];
+ private void WriteVarint32(uint n)
+ {
+ int idx = 0;
+ while (true)
+ {
+ if ((n & ~0x7F) == 0)
+ {
+ i32buf[idx++] = (byte)n;
+ // WriteByteDirect((byte)n);
+ break;
+ // return;
+ }
+ else
+ {
+ i32buf[idx++] = (byte)((n & 0x7F) | 0x80);
+ // WriteByteDirect((byte)((n & 0x7F) | 0x80));
+ n >>= 7;
+ }
+ }
+ trans.Write(i32buf, 0, idx);
+ }
+
+ /**
+ * Write a message header to the wire. Compact Protocol messages
contain the
+ * protocol version so we can migrate forwards in the future if need be.
+ */
+ public override void WriteMessageBegin(TMessage message)
+ {
+ WriteByteDirect(PROTOCOL_ID);
+ WriteByteDirect((byte)((VERSION & VERSION_MASK) |
((((uint)message.Type) << TYPE_SHIFT_AMOUNT) & TYPE_MASK)));
+ WriteVarint32((uint)message.SeqID);
+ WriteString(message.Name);
+ }
+
+ /**
+ * Write a struct begin. This doesn't actually put anything on the
wire. We
+ * use it as an opportunity to put special placeholder markers on the
field
+ * stack so we can get the field id deltas correct.
+ */
+ public override void WriteStructBegin(TStruct strct)
+ {
+ lastField_.Push(lastFieldId_);
+ lastFieldId_ = 0;
+ }
+
+ /**
+ * Write a struct end. This doesn't actually put anything on the wire.
We use
+ * this as an opportunity to pop the last field from the current
struct off
+ * of the field stack.
+ */
+ public override void WriteStructEnd()
+ {
+ lastFieldId_ = lastField_.Pop();
+ }
+
+ /**
+ * Write a field header containing the field id and field type. If the
+ * difference between the current field id and the last one is small
(< 15),
+ * then the field id will be encoded in the 4 MSB as a delta.
Otherwise, the
+ * field id will follow the type header as a zigzag varint.
+ */
+ public override void WriteFieldBegin(TField field)
+ {
+ if (field.Type == TType.Bool)
+ {
+ // we want to possibly include the value, so we'll wait.
+ booleanField_ = field;
+ }
+ else
+ {
+ WriteFieldBeginInternal(field, 0xFF);
+ }
+ }
+
+ /**
+ * The workhorse of WriteFieldBegin. It has the option of doing a
+ * 'type override' of the type header. This is used specifically in
the
+ * boolean field case.
+ */
+ private void WriteFieldBeginInternal(TField field, byte typeOverride)
+ {
+ // short lastField = lastField_.Pop();
+
+ // if there's a type override, use that.
+ byte typeToWrite = typeOverride == 0xFF ?
getCompactType(field.Type) : typeOverride;
+
+ // check if we can use delta encoding for the field id
+ if (field.ID > lastFieldId_ && field.ID - lastFieldId_ <= 15)
+ {
+ // Write them together
+ WriteByteDirect((field.ID - lastFieldId_) << 4 | typeToWrite);
+ }
+ else
+ {
+ // Write them separate
+ WriteByteDirect(typeToWrite);
+ WriteI16(field.ID);
+ }
+
+ lastFieldId_ = field.ID;
+ // lastField_.push(field.id);
+ }
+
+ /**
+ * Write the STOP symbol so we know there are no more fields in this
struct.
+ */
+ public override void WriteFieldStop()
+ {
+ WriteByteDirect(Types.STOP);
+ }
+
+ /**
+ * Write a map header. If the map is empty, omit the key and value
type
+ * headers, as we don't need any additional information to skip it.
+ */
+ public override void WriteMapBegin(TMap map)
+ {
+ if (map.Count == 0)
+ {
+ WriteByteDirect(0);
+ }
+ else
+ {
+ WriteVarint32((uint)map.Count);
+ WriteByteDirect(getCompactType(map.KeyType) << 4 |
getCompactType(map.ValueType));
+ }
+ }
+
+ /**
+ * Write a list header.
+ */
+ public override void WriteListBegin(TList list)
+ {
+ WriteCollectionBegin(list.ElementType, list.Count);
+ }
+
+ /**
+ * Write a set header.
+ */
+ public override void WriteSetBegin(TSet set)
+ {
+ WriteCollectionBegin(set.ElementType, set.Count);
+ }
+
+ /**
+ * Write a boolean value. Potentially, this could be a boolean field,
in
+ * which case the field header info isn't written yet. If so, decide
what the
+ * right type header is for the value and then Write the field header.
+ * Otherwise, Write a single byte.
+ */
+ public override void WriteBool(Boolean b)
+ {
+ if (booleanField_ != null)
+ {
+ // we haven't written the field header yet
+ WriteFieldBeginInternal(booleanField_.Value, b ?
Types.BOOLEAN_TRUE : Types.BOOLEAN_FALSE);
+ booleanField_ = null;
+ }
+ else
+ {
+ // we're not part of a field, so just Write the value.
+ WriteByteDirect(b ? Types.BOOLEAN_TRUE : Types.BOOLEAN_FALSE);
+ }
+ }
+
+ /**
+ * Write a byte. Nothing to see here!
+ */
+ public override void WriteByte(byte b)
+ {
+ WriteByteDirect(b);
+ }
+
+ /**
+ * Write an I16 as a zigzag varint.
+ */
+ public override void WriteI16(short i16)
+ {
+ WriteVarint32(intToZigZag(i16));
+ }
+
+ /**
+ * Write an i32 as a zigzag varint.
+ */
+ public override void WriteI32(int i32)
+ {
+ WriteVarint32(intToZigZag(i32));
+ }
+
+ /**
+ * Write an i64 as a zigzag varint.
+ */
+ public override void WriteI64(long i64)
+ {
+ WriteVarint64(longToZigzag(i64));
+ }
+
+ /**
+ * Write a double to the wire as 8 bytes.
+ */
+ public override void WriteDouble(double dub)
+ {
+ byte[] data = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 };
+ fixedLongToBytes(BitConverter.DoubleToInt64Bits(dub), data, 0);
+ trans.Write(data);
+ }
+
+ /**
+ * Write a string to the wire with a varint size preceding.
+ */
+ public override void WriteString(String str)
+ {
+ byte[] bytes = UTF8Encoding.UTF8.GetBytes(str);
+ WriteBinary(bytes, 0, bytes.Length);
+ }
+
+ /**
+ * Write a byte array, using a varint for the size.
+ */
+ public override void WriteBinary(byte[] bin)
+ {
+ WriteBinary(bin, 0, bin.Length);
+ }
+
+ private void WriteBinary(byte[] buf, int offset, int length)
+ {
+ WriteVarint32((uint)length);
+ trans.Write(buf, offset, length);
+ }
+
+ //
+ // These methods are called by structs, but don't actually have any
wire
+ // output or purpose.
+ //
+
+ public override void WriteMessageEnd() { }
+ public override void WriteMapEnd() { }
+ public override void WriteListEnd() { }
+ public override void WriteSetEnd() { }
+ public override void WriteFieldEnd() { }
+
+ //
+ // Internal writing methods
+ //
+
+ /**
+ * Abstract method for writing the start of lists and sets. List and
sets on
+ * the wire differ only by the type indicator.
+ */
+ protected void WriteCollectionBegin(TType elemType, int size)
+ {
+ if (size <= 14)
+ {
+ WriteByteDirect(size << 4 | getCompactType(elemType));
+ }
+ else
+ {
+ WriteByteDirect(0xf0 | getCompactType(elemType));
+ WriteVarint32((uint)size);
+ }
+ }
+
+ /**
+ * Write an i64 as a varint. Results in 1-10 bytes on the wire.
+ */
+ byte[] varint64out = new byte[10];
+ private void WriteVarint64(ulong n)
+ {
+ int idx = 0;
+ while (true)
+ {
+ if ((n & ~(ulong)0x7FL) == 0)
+ {
+ varint64out[idx++] = (byte)n;
+ break;
+ }
+ else
+ {
+ varint64out[idx++] = ((byte)((n & 0x7F) | 0x80));
+ n >>= 7;
+ }
+ }
+ trans.Write(varint64out, 0, idx);
+ }
+
+ /**
+ * Convert l into a zigzag long. This allows negative numbers to be
+ * represented compactly as a varint.
+ */
+ private ulong longToZigzag(long n)
+ {
+ return (ulong)(((ulong)n << 1) ^ ((ulong)n >> 63));
+ }
+
+ /**
+ * Convert n into a zigzag int. This allows negative numbers to be
+ * represented compactly as a varint.
+ */
+ private uint intToZigZag(int n)
+ {
+ return (uint)(((uint)n << 1) ^ ((uint)n >> 31));
+ }
+
+ /**
+ * Convert a long into little-endian bytes in buf starting at off and
going
+ * until off+7.
+ */
+ private void fixedLongToBytes(long n, byte[] buf, int off)
+ {
+ buf[off + 0] = (byte)(n & 0xff);
+ buf[off + 1] = (byte)((n >> 8) & 0xff);
+ buf[off + 2] = (byte)((n >> 16) & 0xff);
+ buf[off + 3] = (byte)((n >> 24) & 0xff);
+ buf[off + 4] = (byte)((n >> 32) & 0xff);
+ buf[off + 5] = (byte)((n >> 40) & 0xff);
+ buf[off + 6] = (byte)((n >> 48) & 0xff);
+ buf[off + 7] = (byte)((n >> 56) & 0xff);
+ }
+
+ #endregion
+
+ #region ReadMethods
+
+ /**
+ * Read a message header.
+ */
+ public override TMessage ReadMessageBegin()
+ {
+ byte protocolId = ReadByte();
+ if (protocolId != PROTOCOL_ID)
+ {
+ throw new TProtocolException("Expected protocol id " +
PROTOCOL_ID.ToString("X") + " but got " + protocolId.ToString("X"));
+ }
+ byte versionAndType = ReadByte();
+ byte version = (byte)(versionAndType & VERSION_MASK);
+ if (version != VERSION)
+ {
+ throw new TProtocolException("Expected version " + VERSION + "
but got " + version);
+ }
+ byte type = (byte)((versionAndType >> TYPE_SHIFT_AMOUNT) & 0x03);
+ int seqid = (int)ReadVarint32();
+ String messageName = ReadString();
+ return new TMessage(messageName, (TMessageType)type, seqid);
+ }
+
+ /**
+ * Read a struct begin. There's nothing on the wire for this, but it
is our
+ * opportunity to push a new struct begin marker onto the field stack.
+ */
+ public override TStruct ReadStructBegin()
+ {
+ lastField_.Push(lastFieldId_);
+ lastFieldId_ = 0;
+ return ANONYMOUS_STRUCT;
+ }
+
+ /**
+ * Doesn't actually consume any wire data, just removes the last field
for
+ * this struct from the field stack.
+ */
+ public override void ReadStructEnd()
+ {
+ // consume the last field we Read off the wire.
+ lastFieldId_ = lastField_.Pop();
+ }
+
+ /**
+ * Read a field header off the wire.
+ */
+ public override TField ReadFieldBegin()
+ {
+ byte type = ReadByte();
+
+ // if it's a stop, then we can return immediately, as the struct
is over.
+ if (type == Types.STOP)
+ {
+ return TSTOP;
+ }
+
+ short fieldId;
+
+ // mask off the 4 MSB of the type header. it could contain a field
id delta.
+ short modifier = (short)((type & 0xf0) >> 4);
+ if (modifier == 0)
+ {
+ // not a delta. look ahead for the zigzag varint field id.
+ fieldId = ReadI16();
+ }
+ else
+ {
+ // has a delta. add the delta to the last Read field id.
+ fieldId = (short)(lastFieldId_ + modifier);
+ }
+
+ TField field = new TField("", getTType((byte)(type & 0x0f)),
fieldId);
+
+ // if this happens to be a boolean field, the value is encoded in
the type
+ if (isBoolType(type))
+ {
+ // save the boolean value in a special instance variable.
+ boolValue_ = (byte)(type & 0x0f) == Types.BOOLEAN_TRUE ? true
: false;
+ }
+
+ // push the new field onto the field stack so we can keep the
deltas going.
+ lastFieldId_ = field.ID;
+ return field;
+ }
+
+ /**
+ * Read a map header off the wire. If the size is zero, skip Reading
the key
+ * and value type. This means that 0-length maps will yield TMaps
without the
+ * "correct" types.
+ */
+ public override TMap ReadMapBegin()
+ {
+ int size = (int)ReadVarint32();
+ byte keyAndValueType = size == 0 ? (byte)0 : ReadByte();
+ return new TMap(getTType((byte)(keyAndValueType >> 4)),
getTType((byte)(keyAndValueType & 0xf)), size);
+ }
+
+ /**
+ * Read a list header off the wire. If the list size is 0-14, the size
will
+ * be packed into the element type header. If it's a longer list, the
4 MSB
+ * of the element type header will be 0xF, and a varint will follow
with the
+ * true size.
+ */
+ public override TList ReadListBegin()
+ {
+ byte size_and_type = ReadByte();
+ int size = (size_and_type >> 4) & 0x0f;
+ if (size == 15)
+ {
+ size = (int)ReadVarint32();
+ }
+ TType type = getTType(size_and_type);
+ return new TList(type, size);
+ }
+
+ /**
+ * Read a set header off the wire. If the set size is 0-14, the size
will
+ * be packed into the element type header. If it's a longer set, the 4
MSB
+ * of the element type header will be 0xF, and a varint will follow
with the
+ * true size.
+ */
+ public override TSet ReadSetBegin()
+ {
+ return new TSet(ReadListBegin());
+ }
+
+ /**
+ * Read a boolean off the wire. If this is a boolean field, the value
should
+ * already have been Read during ReadFieldBegin, so we'll just consume
the
+ * pre-stored value. Otherwise, Read a byte.
+ */
+ public override Boolean ReadBool()
+ {
+ if (boolValue_ != null)
+ {
+ bool result = boolValue_.Value;
+ boolValue_ = null;
+ return result;
+ }
+ return ReadByte() == Types.BOOLEAN_TRUE;
+ }
+
+ byte[] byteRawBuf = new byte[1];
+ /**
+ * Read a single byte off the wire. Nothing interesting here.
+ */
+ public override byte ReadByte()
+ {
+ trans.ReadAll(byteRawBuf, 0, 1);
+ return byteRawBuf[0];
+ }
+
+ /**
+ * Read an i16 from the wire as a zigzag varint.
+ */
+ public override short ReadI16()
+ {
+ return (short)zigzagToInt(ReadVarint32());
+ }
+
+ /**
+ * Read an i32 from the wire as a zigzag varint.
+ */
+ public override int ReadI32()
+ {
+ return zigzagToInt(ReadVarint32());
+ }
+
+ /**
+ * Read an i64 from the wire as a zigzag varint.
+ */
+ public override long ReadI64()
+ {
+ return zigzagToLong(ReadVarint64());
+ }
+
+ /**
+ * No magic here - just Read a double off the wire.
+ */
+ public override double ReadDouble()
+ {
+ byte[] longBits = new byte[8];
+ trans.ReadAll(longBits, 0, 8);
+ return BitConverter.Int64BitsToDouble(bytesToLong(longBits));
+ }
+
+ /**
+ * Reads a byte[] (via ReadBinary), and then UTF-8 decodes it.
+ */
+ public override String ReadString()
+ {
+ int length = (int)ReadVarint32();
+
+ if (length == 0)
+ {
+ return "";
+ }
+
+ return Encoding.UTF8.GetString(ReadBinary(length));
+ }
+
+ /**
+ * Read a byte[] from the wire.
+ */
+ public override byte[] ReadBinary()
+ {
+ int length = (int)ReadVarint32();
+ if (length == 0) return new byte[0];
+
+ byte[] buf = new byte[length];
+ trans.ReadAll(buf, 0, length);
+ return buf;
+ }
+
+ /**
+ * Read a byte[] of a known length from the wire.
+ */
+ private byte[] ReadBinary(int length)
+ {
+ if (length == 0) return new byte[0];
+
+ byte[] buf = new byte[length];
+ trans.ReadAll(buf, 0, length);
+ return buf;
+ }
+
+ //
+ // These methods are here for the struct to call, but don't have any
wire
+ // encoding.
+ //
+ public override void ReadMessageEnd() { }
+ public override void ReadFieldEnd() { }
+ public override void ReadMapEnd() { }
+ public override void ReadListEnd() { }
+ public override void ReadSetEnd() { }
+
+ //
+ // Internal Reading methods
+ //
+
+ /**
+ * Read an i32 from the wire as a varint. The MSB of each byte is set
+ * if there is another byte to follow. This can Read up to 5 bytes.
+ */
+ private uint ReadVarint32()
+ {
+ uint result = 0;
+ int shift = 0;
+ while (true)
+ {
+ byte b = ReadByte();
+ result |= (uint)(b & 0x7f) << shift;
+ if ((b & 0x80) != 0x80) break;
+ shift += 7;
+ }
+ return result;
+ }
+
+ /**
+ * Read an i64 from the wire as a proper varint. The MSB of each byte
is set
+ * if there is another byte to follow. This can Read up to 10 bytes.
+ */
+ private ulong ReadVarint64()
+ {
+ int shift = 0;
+ ulong result = 0;
+ while (true)
+ {
+ byte b = ReadByte();
+ result |= (ulong)(b & 0x7f) << shift;
+ if ((b & 0x80) != 0x80) break;
+ shift += 7;
+ }
+
+ return result;
+ }
+
+ #endregion
+
+ //
+ // encoding helpers
+ //
+
+ /**
+ * Convert from zigzag int to int.
+ */
+ private int zigzagToInt(uint n)
+ {
+ return (int)(n >> 1) ^ (-(int)(n & 1));
+ }
+
+ /**
+ * Convert from zigzag long to long.
+ */
+ private long zigzagToLong(ulong n)
+ {
+ return (long)(n >> 1) ^ (-(long)(n & 1));
+ }
+
+ /**
+ * Note that it's important that the mask bytes are long literals,
+ * otherwise they'll default to ints, and when you shift an int left
56 bits,
+ * you just get a messed up int.
+ */
+ private long bytesToLong(byte[] bytes)
+ {
+ return
+ ((bytes[7] & 0xffL) << 56) |
+ ((bytes[6] & 0xffL) << 48) |
+ ((bytes[5] & 0xffL) << 40) |
+ ((bytes[4] & 0xffL) << 32) |
+ ((bytes[3] & 0xffL) << 24) |
+ ((bytes[2] & 0xffL) << 16) |
+ ((bytes[1] & 0xffL) << 8) |
+ ((bytes[0] & 0xffL));
+ }
+
+ //
+ // type testing and converting
+ //
+
+ private Boolean isBoolType(byte b)
+ {
+ int lowerNibble = b & 0x0f;
+ return lowerNibble == Types.BOOLEAN_TRUE || lowerNibble ==
Types.BOOLEAN_FALSE;
+ }
+
+ /**
+ * Given a TCompactProtocol.Types constant, convert it to its
corresponding
+ * TType value.
+ */
+ private TType getTType(byte type)
+ {
+ switch ((byte)(type & 0x0f))
+ {
+ case Types.STOP:
+ return TType.Stop;
+ case Types.BOOLEAN_FALSE:
+ case Types.BOOLEAN_TRUE:
+ return TType.Bool;
+ case Types.BYTE:
+ return TType.Byte;
+ case Types.I16:
+ return TType.I16;
+ case Types.I32:
+ return TType.I32;
+ case Types.I64:
+ return TType.I64;
+ case Types.DOUBLE:
+ return TType.Double;
+ case Types.BINARY:
+ return TType.String;
+ case Types.LIST:
+ return TType.List;
+ case Types.SET:
+ return TType.Set;
+ case Types.MAP:
+ return TType.Map;
+ case Types.STRUCT:
+ return TType.Struct;
+ default:
+ throw new TProtocolException("don't know what type: " +
(byte)(type & 0x0f));
+ }
+ }
+
+ /**
+ * Given a TType value, find the appropriate TCompactProtocol.Types
constant.
+ */
+ private byte getCompactType(TType ttype)
+ {
+ return ttypeToCompactType[(int)ttype];
+ }
+ }
+}
