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// Copyright 2007 Google Inc.
// All Rights Reserved.
package com.google.common.io.protocol;
import java.util.*;
/**
* This class can be used to create a memory model of a .proto file.
*
*/
public class ProtoBufType {
// Note: Values 0..15 are reserved for wire types!
public static final int TYPE_UNDEFINED = 16;
public static final int TYPE_DOUBLE = 17;
public static final int TYPE_FLOAT = 18;
public static final int TYPE_INT64 = 19;
public static final int TYPE_UINT64 = 20;
public static final int TYPE_INT32 = 21;
public static final int TYPE_FIXED64 = 22;
public static final int TYPE_FIXED32 = 23;
public static final int TYPE_BOOL = 24;
public static final int TYPE_DATA = 25;
public static final int TYPE_GROUP = 26;
public static final int TYPE_MESSAGE = 27;
public static final int TYPE_TEXT = 28;
public static final int TYPE_UINT32 = 29;
public static final int TYPE_ENUM = 30;
public static final int TYPE_SFIXED32 = 31;
public static final int TYPE_SFIXED64 = 32;
// new protobuf 2 types
public static final int TYPE_SINT32 = 33;
public static final int TYPE_SINT64 = 34;
public static final int TYPE_BYTES = 35;
public static final int TYPE_STRING = 36;
public static final int MASK_TYPE = 0x0ff;
public static final int MASK_MODIFIER = 0x0ff00;
public static final int REQUIRED = 0x100;
public static final int OPTIONAL = 0x200;
public static final int REPEATED = 0x400;
private final IntMap types = new IntMap();
/*
* A struct to store field type and default object.
* Two TypeInfo objects are equal iff both have the
* euqal type and object.
*/
static class TypeInfo {
private int type;
private Object data;
TypeInfo(int t, Object d) {
type = t;
data = d;
}
public int hashCode() {
return type;
}
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || !(obj instanceof TypeInfo)) {
return false;
}
TypeInfo peerTypeInfo = (TypeInfo) obj;
return type == peerTypeInfo.type &&
(data == peerTypeInfo.data ||
(data != null && data.equals(peerTypeInfo.data)));
}
public String toString() {
return "TypeInfo{type=" + type + ", data=" + data + "}";
}
};
private final String typeName;
/**
* Empty constructor.
*/
public ProtoBufType() {
typeName = null;
}
/**
* Constructor including a type name for debugging purposes.
*/
public ProtoBufType(String typeName) {
this.typeName = typeName;
}
/**
* Adds a tag description. The data parameter contains the group definition
* for group elements and the default value for regular elements.
*
* @param optionsAndType any legal combination (bitwise or) of REQUIRED
* or OPTIONAL and REPEATED and one of the TYPE_
* constants
* @param tag the tag id
* @param data the type for group elements (or the default value for
* regular elements in future versions)
* @return this is returned to permit cascading
*/
public ProtoBufType addElement(int optionsAndType, int tag, Object data) {
types.put(tag, new TypeInfo(optionsAndType, data));
return this;
}
/**
* Returns a IntMap that has the same lower buffer size as types.
* This is for ProtoBuf to create IntMap with pre-allocated
* internal buffer.
*/
/* package protected */ IntMap newIntMapForProtoBuf() {
return types.newIntMapWithSameBufferSize();
}
/**
* Returns the type for the given tag id (without modifiers such as OPTIONAL,
* REPEATED). For undefined tags, TYPE_UNDEFINED is returned.
*/
public int getType(int tag) {
TypeInfo typeInfo = (TypeInfo) types.get(tag);
return typeInfo == null ? TYPE_UNDEFINED : typeInfo.type & MASK_TYPE;
}
/**
* Returns a bit combination of the modifiers for the given tag id
* (OPTIONAL, REPEATED, REQUIRED). For undefined tags, OPTIONAL|REPEATED
* is returned.
*/
public int getModifiers(int tag) {
TypeInfo typeInfo = (TypeInfo) types.get(tag);
return typeInfo == null ? (OPTIONAL | REPEATED) : typeInfo.type & MASK_MODIFIER;
}
/**
* Returns the data associated to a given tag (either the default value for
* regular elements or a ProtoBufType for groups and messages). For undefined
* tags, null is returned.
*/
public Object getData(int tag) {
TypeInfo typeInfo = (TypeInfo) types.get(tag);
return typeInfo == null ? typeInfo : typeInfo.data;
}
/**
* Returns the type name set in the constructor for debugging purposes.
*/
public String toString() {
return "ProtoBufType Name: " + typeName;
}
/**
* {@inheritDoc}
* <p>Two ProtoBufTypes are equals if the fields types are the same.
*/
public boolean equals(Object object) {
if (null == object) {
// trivial check
return false;
} else if (this == object) {
// trivial check
return true;
} else if (this.getClass() != object.getClass()) {
// different class
return false;
}
ProtoBufType other = (ProtoBufType) object;
return types.equals(other.types);
}
/**
* {@inheritDoc}
*/
public int hashCode() {
if (types != null) {
return types.hashCode();
} else {
return super.hashCode();
}
}
}
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