root/third_party/protobuf/java/src/main/java/com/google/protobuf/WireFormat.java

DEFINITIONS

1. getTagWireType
2. getTagFieldNumber
3. makeTag
4. INT
5. LONG
6. FLOAT
7. DOUBLE
8. BOOLEAN
9. STRING
10. BYTE_STRING
11. ENUM
12. MESSAGE
13. getDefaultDefault
14. DOUBLE
15. FLOAT
16. INT64
17. UINT64
18. INT32
19. FIXED64
20. FIXED32
21. BOOL
22. STRING
23. GROUP
24. MESSAGE
25. BYTES
26. UINT32
27. ENUM
28. SFIXED32
29. SFIXED64
30. SINT32
31. SINT64
32. getJavaType
33. getWireType
34. isPackable

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package com.google.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 protobuf} 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;

  static final int TAG_TYPE_BITS = 3;
  static final int TAG_TYPE_MASK = (1 << TAG_TYPE_BITS) - 1;

  /** Given a tag value, determines the wire type (the lower 3 bits). */
  static int getTagWireType(final int tag) {
    return tag & TAG_TYPE_MASK;
  }

  /** Given a tag value, determines the field number (the upper 29 bits). */
  public static int getTagFieldNumber(final int tag) {
    return tag >>> TAG_TYPE_BITS;
  }

  /** Makes a tag value given a field number and wire type. */
  static int makeTag(final int fieldNumber, final int wireType) {
    return (fieldNumber << TAG_TYPE_BITS) | wireType;
  }

  /**
   * Lite equivalent to {@link Descriptors.FieldDescriptor.JavaType}.  This is
   * only here to support the lite runtime and should not be used by users.
   */
  public enum JavaType {
    INT(0),
    LONG(0L),
    FLOAT(0F),
    DOUBLE(0D),
    BOOLEAN(false),
    STRING(""),
    BYTE_STRING(ByteString.EMPTY),
    ENUM(null),
    MESSAGE(null);

    JavaType(final Object defaultDefault) {
      this.defaultDefault = defaultDefault;
    }

    /**
     * The default default value for fields of this type, if it's a primitive
     * type.
     */
    Object getDefaultDefault() {
      return defaultDefault;
    }

    private final Object defaultDefault;
  }

  /**
   * Lite equivalent to {@link Descriptors.FieldDescriptor.Type}.  This is
   * only here to support the lite runtime and should not be used by users.
   */
  public enum FieldType {
    DOUBLE  (JavaType.DOUBLE     , WIRETYPE_FIXED64         ),
    FLOAT   (JavaType.FLOAT      , WIRETYPE_FIXED32         ),
    INT64   (JavaType.LONG       , WIRETYPE_VARINT          ),
    UINT64  (JavaType.LONG       , WIRETYPE_VARINT          ),
    INT32   (JavaType.INT        , WIRETYPE_VARINT          ),
    FIXED64 (JavaType.LONG       , WIRETYPE_FIXED64         ),
    FIXED32 (JavaType.INT        , WIRETYPE_FIXED32         ),
    BOOL    (JavaType.BOOLEAN    , WIRETYPE_VARINT          ),
    STRING  (JavaType.STRING     , WIRETYPE_LENGTH_DELIMITED) {
      public boolean isPackable() { return false; }
    },
    GROUP   (JavaType.MESSAGE    , WIRETYPE_START_GROUP     ) {
      public boolean isPackable() { return false; }
    },
    MESSAGE (JavaType.MESSAGE    , WIRETYPE_LENGTH_DELIMITED) {
      public boolean isPackable() { return false; }
    },
    BYTES   (JavaType.BYTE_STRING, WIRETYPE_LENGTH_DELIMITED) {
      public boolean isPackable() { return false; }
    },
    UINT32  (JavaType.INT        , WIRETYPE_VARINT          ),
    ENUM    (JavaType.ENUM       , WIRETYPE_VARINT          ),
    SFIXED32(JavaType.INT        , WIRETYPE_FIXED32         ),
    SFIXED64(JavaType.LONG       , WIRETYPE_FIXED64         ),
    SINT32  (JavaType.INT        , WIRETYPE_VARINT          ),
    SINT64  (JavaType.LONG       , WIRETYPE_VARINT          );

    FieldType(final JavaType javaType, final int wireType) {
      this.javaType = javaType;
      this.wireType = wireType;
    }

    private final JavaType javaType;
    private final int wireType;

    public JavaType getJavaType() { return javaType; }
    public int getWireType() { return wireType; }

    public boolean isPackable() { return true; }
  }

  // Field numbers for fields in MessageSet wire format.
  static final int MESSAGE_SET_ITEM    = 1;
  static final int MESSAGE_SET_TYPE_ID = 2;
  static final int MESSAGE_SET_MESSAGE = 3;

  // Tag numbers.
  static final int MESSAGE_SET_ITEM_TAG =
    makeTag(MESSAGE_SET_ITEM, WIRETYPE_START_GROUP);
  static final int MESSAGE_SET_ITEM_END_TAG =
    makeTag(MESSAGE_SET_ITEM, WIRETYPE_END_GROUP);
  static final int MESSAGE_SET_TYPE_ID_TAG =
    makeTag(MESSAGE_SET_TYPE_ID, WIRETYPE_VARINT);
  static final int MESSAGE_SET_MESSAGE_TAG =
    makeTag(MESSAGE_SET_MESSAGE, WIRETYPE_LENGTH_DELIMITED);
}