// Protocol Buffers - Google's data interchange format | |
// Copyright 2008 Google Inc. | |
// http://code.google.com/p/protobuf/ | |
// | |
// Licensed 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.activemq.protobuf; | |
/** | |
* This class is used internally by the Protocol Buffer library and generated | |
* message implementations. It is public only because those generated messages | |
* do not reside in the {@code protocol2} package. Others should not use this | |
* class directly. | |
* | |
* This class contains constants and helper functions useful for dealing with | |
* the Protocol Buffer wire format. | |
* | |
* @author kenton@google.com Kenton Varda | |
*/ | |
public final class WireFormat { | |
// Do not allow instantiation. | |
private WireFormat() { | |
} | |
public static final int WIRETYPE_VARINT = 0; | |
public static final int WIRETYPE_FIXED64 = 1; | |
public static final int WIRETYPE_LENGTH_DELIMITED = 2; | |
public static final int WIRETYPE_START_GROUP = 3; | |
public static final int WIRETYPE_END_GROUP = 4; | |
public static final int WIRETYPE_FIXED32 = 5; | |
public static final int TAG_TYPE_BITS = 3; | |
public static final int TAG_TYPE_MASK = (1 << TAG_TYPE_BITS) - 1; | |
/** Given a tag value, determines the wire type (the lower 3 bits). */ | |
public static int getTagWireType(int tag) { | |
return tag & TAG_TYPE_MASK; | |
} | |
/** Given a tag value, determines the field number (the upper 29 bits). */ | |
public static int getTagFieldNumber(int tag) { | |
return tag >>> TAG_TYPE_BITS; | |
} | |
/** Makes a tag value given a field number and wire type. */ | |
public static int makeTag(int fieldNumber, int wireType) { | |
return (fieldNumber << TAG_TYPE_BITS) | wireType; | |
} | |
// Field numbers for feilds in MessageSet wire format. | |
public static final int MESSAGE_SET_ITEM = 1; | |
public static final int MESSAGE_SET_TYPE_ID = 2; | |
public static final int MESSAGE_SET_MESSAGE = 3; | |
// Tag numbers. | |
public static final int MESSAGE_SET_ITEM_TAG = makeTag(MESSAGE_SET_ITEM, WIRETYPE_START_GROUP); | |
public static final int MESSAGE_SET_ITEM_END_TAG = makeTag(MESSAGE_SET_ITEM, WIRETYPE_END_GROUP); | |
public static final int MESSAGE_SET_TYPE_ID_TAG = makeTag(MESSAGE_SET_TYPE_ID, WIRETYPE_VARINT); | |
public static final int MESSAGE_SET_MESSAGE_TAG = makeTag(MESSAGE_SET_MESSAGE, WIRETYPE_LENGTH_DELIMITED); | |
} |