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/*
* 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 org.apache.thrift.TException;
/**
* Utility class with static methods for interacting with protocol data
* streams.
*
*/
public class TProtocolUtil {
/**
* The maximum recursive depth the skip() function will traverse before
* throwing a TException.
*/
private static int maxSkipDepth = Integer.MAX_VALUE;
/**
* Specifies the maximum recursive depth that the skip function will
* traverse before throwing a TException. This is a global setting, so
* any call to skip in this JVM will enforce this value.
*
* @param depth the maximum recursive depth. A value of 2 would allow
* the skip function to skip a structure or collection with basic children,
* but it would not permit skipping a struct that had a field containing
* a child struct. A value of 1 would only allow skipping of simple
* types and empty structs/collections.
*/
public static void setMaxSkipDepth(int depth) {
maxSkipDepth = depth;
}
/**
* Skips over the next data element from the provided input TProtocol object.
*
* @param prot the protocol object to read from
* @param type the next value will be intepreted as this TType value.
*/
public static void skip(TProtocol prot, byte type)
throws TException {
skip(prot, type, maxSkipDepth);
}
/**
* Skips over the next data element from the provided input TProtocol object.
*
* @param prot the protocol object to read from
* @param type the next value will be intepreted as this TType value.
* @param maxDepth this function will only skip complex objects to this
* recursive depth, to prevent Java stack overflow.
*/
public static void skip(TProtocol prot, byte type, int maxDepth)
throws TException {
if (maxDepth <= 0) {
throw new TException("Maximum skip depth exceeded");
}
switch (type) {
case TType.BOOL:
{
prot.readBool();
break;
}
case TType.BYTE:
{
prot.readByte();
break;
}
case TType.I16:
{
prot.readI16();
break;
}
case TType.I32:
{
prot.readI32();
break;
}
case TType.I64:
{
prot.readI64();
break;
}
case TType.DOUBLE:
{
prot.readDouble();
break;
}
case TType.STRING:
{
prot.readBinary();
break;
}
case TType.STRUCT:
{
prot.readStructBegin();
while (true) {
TField field = prot.readFieldBegin();
if (field.type == TType.STOP) {
break;
}
skip(prot, field.type, maxDepth - 1);
prot.readFieldEnd();
}
prot.readStructEnd();
break;
}
case TType.MAP:
{
TMap map = prot.readMapBegin();
for (int i = 0; i < map.size; i++) {
skip(prot, map.keyType, maxDepth - 1);
skip(prot, map.valueType, maxDepth - 1);
}
prot.readMapEnd();
break;
}
case TType.SET:
{
TSet set = prot.readSetBegin();
for (int i = 0; i < set.size; i++) {
skip(prot, set.elemType, maxDepth - 1);
}
prot.readSetEnd();
break;
}
case TType.LIST:
{
TList list = prot.readListBegin();
for (int i = 0; i < list.size; i++) {
skip(prot, list.elemType, maxDepth - 1);
}
prot.readListEnd();
break;
}
default:
break;
}
}
}
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