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// Copyright 2008 The Closure Library Authors. All Rights Reserved.
//
// 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.
/**
* @fileoverview Protocol Buffer 2 Serializer which serializes messages
* into anonymous, simplified JSON objects.
*
*/
goog.provide('goog.proto2.ObjectSerializer');
goog.require('goog.proto2.Serializer');
goog.require('goog.proto2.Util');
goog.require('goog.string');
/**
* ObjectSerializer, a serializer which turns Messages into simplified
* ECMAScript objects.
*
* @param {goog.proto2.ObjectSerializer.KeyOption=} opt_keyOption If specified,
* which key option to use when serializing/deserializing.
* @constructor
* @extends {goog.proto2.Serializer}
*/
goog.proto2.ObjectSerializer = function(opt_keyOption) {
this.keyOption_ = opt_keyOption;
};
goog.inherits(goog.proto2.ObjectSerializer, goog.proto2.Serializer);
/**
* An enumeration of the options for how to emit the keys in
* the generated simplified object.
*
* @enum {number}
*/
goog.proto2.ObjectSerializer.KeyOption = {
/**
* Use the tag of the field as the key (default)
*/
TAG: 0,
/**
* Use the name of the field as the key. Unknown fields
* will still use their tags as keys.
*/
NAME: 1
};
/**
* Serializes a message to an object.
*
* @param {goog.proto2.Message} message The message to be serialized.
* @return {Object} The serialized form of the message.
* @override
*/
goog.proto2.ObjectSerializer.prototype.serialize = function(message) {
var descriptor = message.getDescriptor();
var fields = descriptor.getFields();
var objectValue = {};
// Add the defined fields, recursively.
for (var i = 0; i < fields.length; i++) {
var field = fields[i];
var key =
this.keyOption_ == goog.proto2.ObjectSerializer.KeyOption.NAME ?
field.getName() : field.getTag();
if (message.has(field)) {
if (field.isRepeated()) {
var array = [];
objectValue[key] = array;
for (var j = 0; j < message.countOf(field); j++) {
array.push(this.getSerializedValue(field, message.get(field, j)));
}
} else {
objectValue[key] = this.getSerializedValue(field, message.get(field));
}
}
}
// Add the unknown fields, if any.
message.forEachUnknown(function(tag, value) {
objectValue[tag] = value;
});
return objectValue;
};
/**
* Deserializes a message from an object and places the
* data in the message.
*
* @param {goog.proto2.Message} message The message in which to
* place the information.
* @param {*} data The data of the message.
* @override
*/
goog.proto2.ObjectSerializer.prototype.deserializeTo = function(message, data) {
var descriptor = message.getDescriptor();
for (var key in data) {
var field;
var value = data[key];
var isNumeric = goog.string.isNumeric(key);
if (isNumeric) {
field = descriptor.findFieldByTag(key);
} else {
// We must be in Key == NAME mode to lookup by name.
goog.proto2.Util.assert(
this.keyOption_ == goog.proto2.ObjectSerializer.KeyOption.NAME);
field = descriptor.findFieldByName(key);
}
if (field) {
if (field.isRepeated()) {
goog.proto2.Util.assert(goog.isArray(value));
for (var j = 0; j < value.length; j++) {
message.add(field, this.getDeserializedValue(field, value[j]));
}
} else {
goog.proto2.Util.assert(!goog.isArray(value));
message.set(field, this.getDeserializedValue(field, value));
}
} else {
if (isNumeric) {
// We have an unknown field.
message.setUnknown(/** @type {number} */ (key), value);
} else {
// Named fields must be present.
goog.proto2.Util.assert(field);
}
}
}
};
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