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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.
*/
/**
* @fileoverview
* Extends the gadgets.json namespace with code that translates arbitrary XML to JSON.
*/
/**
* @static
* @class Translates arbitrary XML to JSON
* @name gadgets.json.convertXmlToJson
*/
gadgets.json.xml = (function() {
//Integer which represents a text node
var TEXT_NODE = 3;
/**
* Parses all the child nodes of a specific DOM element and adds them to the JSON object
* passed in.
*
* @param {Array} childNodes an array of DOM nodes.
* @param {Object} json The JSON object to use for the conversion. The DOM nodes will be added to
* this JSON object.
*/
function parseChildNodes(childNodes, json) {
for (var index = 0; index < childNodes.length; index++) {
var node = childNodes[index];
if (node.nodeType == TEXT_NODE) {
setTextNodeValue(json, node.nodeName, node);
}
else {
if (node.childNodes.length == 0) {
if (node.attributes != null && node.attributes.length != 0) {
/*
* If there are no children but there are attributes set the value for
* this node in the JSON object to the JSON for the attributes. There is nothing
* left to do since there are no children.
*/
setAttributes(node, json);
}
else {
/*
* If there are no children and no attributes set the value to null.
*/
json[node.nodeName] = null;
}
}
else {
if (node.childNodes.length == 1 && node.firstChild.nodeType == TEXT_NODE && (node.attributes == null || node.attributes.length == 0)) {
/*
* There is only one child node and it is a text node AND we have no attributes so
* just extract the text value from the text node and set it in the JSON object.
*/
setTextNodeValue(json, node.nodeName, node.firstChild);
}
else {
/*
* There are both children and attributes, so recursively call this method until we have
* reached the end.
*/
setChildrenValues(json, node);
}
}
}
}
};
/**
* Sets the JSON values for the children of a specified DOM element.
* @param {Object} json the JSON object to set the values in.
* @param node the DOM node containing children.
*/
function setChildrenValues(json, node) {
var currentValue = json[node.nodeName];
if (currentValue == null) {
/*
* If there is no value for this property (node name) than
* add the attributes and parse the children.
*/
json[node.nodeName] = {};
if (node.attributes != null && node.attributes.length != 0) {
setAttributesValues(node.attributes, json[node.nodeName]);
}
parseChildNodes(node.childNodes, json[node.nodeName]);
}
else {
/*
* There is a value already for this property (node name) so
* we need to create an array for the values of this property.
* First add all the attributes then parse the children and create
* an array from the result.
*/
var temp = {};
if (node.attributes != null && node.attributes.length != 0) {
setAttributesValues(node.attributes, temp);
}
parseChildNodes(node.childNodes, temp);
json[node.nodeName] = createValue(currentValue, temp);
}
};
/**
* Sets the JSON value for a text node.
* @param {Object} json the JSON object to set the values in.
* @param {string} nodeName the node name to set the value to.
* @param textNode the text node containing the value to set.
*/
function setTextNodeValue(json, nodeName, textNode) {
var currentValue = json[nodeName];
if (currentValue != null) {
json[nodeName] = createValue(currentValue, textNode.nodeValue);
}
else {
json[nodeName] = textNode.nodeValue;
}
};
/**
* Handles creating the text node value. In some cases you may want to
* create an array for the value if the node already has a value in the
* JSON object.
* @param currentValue the current value from the JSON object.
* @param node the text node containing the value.
*/
function createValue(currentValue, value) {
if (currentValue instanceof Array) {
currentValue[currentValue.length] = value;
return currentValue;
}
else {
return new Array(currentValue, value);
}
};
/**
* Sets the attributes from a DOM node in a JSON object.
* @param node the node to add the attributes are on.
* @param json the json object to set the attributes in.
*/
function setAttributes(node, json) {
var currentValue = json[node.nodeName];
if (currentValue == null) {
json[node.nodeName] = {};
setAttributesValues(node.attributes, json[node.nodeName]);
}
else {
var temp = {};
setAttributesValues(node.attributes, temp);
json[node.nodeName] = createValue(currentValue, temp);
}
};
/**
* Sets the values from attributes from a DOM node in a JSON object.
* @param attributes the DOM node's attributes.
* @param {Object} json the JSON object to set the values in.
*/
function setAttributesValues(attributes, json) {
var attribute = null;
for (var attrIndex = 0; attrIndex < attributes.length; attrIndex++) {
attribute = attributes[attrIndex];
json['@' + attribute.nodeName] = attribute.nodeValue;
}
};
return {
convertXmlToJson: function(xmlDoc) {
var childNodes = xmlDoc.childNodes;
var result = {};
parseChildNodes(childNodes, result);
return result;
}
};
})();
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