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350 lines
11 KiB
JavaScript
350 lines
11 KiB
JavaScript
dojo.provide("dojox.wire.Wire");
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dojo.require("dojox.wire._base");
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dojo.declare("dojox.wire.Wire", null, {
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// summary:
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// A default and base Wire to access an object property
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// description:
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// This class accesses a property of an object with a dotted notation
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// specified to 'property' property, such as "a.b.c", which identifies
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// a descendant property, "object.a.b.c".
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// Property names in the dotted notation may have an array index, such
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// as "a[0]", to identify an array element, literally, "object.a[0]".
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// When a notation start with an array index, such as "[0].a", it
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// specifies an array element of the root object (array),
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// "object[0].a".
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// This class also serves as a base class for other Wire classes,
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// preparing a root object and converting a return value, so that
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// sub-classes just can implement _getValue() and _setValue() called
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// from getValue() and setValue() implemented by this calss.
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_wireClass: "dojox.wire.Wire",
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constructor: function(/*Object*/args){
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// summary:
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// Initialize properties
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// description:
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// If 'converter' property is specified and is a string for
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// a converter class, an instanceof the converter class is
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// created.
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// args:
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// Arguments to initialize properties
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// object:
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// A root object (or another Wire to access a root object)
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// property:
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// A dotted notation to a descendant property
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// type:
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// A type of the return value (for the source Wire)
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// converter:
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// A converter object (or class name) to convert the return
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// value (for the source Wire)
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dojo.mixin(this, args);
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if(this.converter){
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if(dojo.isString(this.converter)){
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//First check the object tree for it. Might be defined variable
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//name/global function (like a jsId, or just a function name).
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var convertObject = dojo.getObject(this.converter);
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if (dojo.isFunction(convertObject)){
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//We need to see if this is a pure function or an object constructor...
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try{
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var testObj = new convertObject();
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if(testObj && !dojo.isFunction(testObj["convert"])){
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//Looks like a 'pure' function...
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this.converter = {convert: convertObject};
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}else{
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this.converter = testObj;
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}
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}catch(e){
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//Do if this fails.
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}
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}else if(dojo.isObject(convertObject)){
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//It's an object, like a jsId ... see if it has a convert function
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if(dojo.isFunction(convertObject["convert"])){
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this.converter = convertObject;
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}
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}
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//No object with that name (Converter is still a string),
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//then look for a class that needs to be dynamically loaded...
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if (dojo.isString(this.converter)) {
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var converterClass = dojox.wire._getClass(this.converter);
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if(converterClass){
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this.converter = new converterClass();
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}else{
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this.converter = undefined;
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}
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}
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}else if(dojo.isFunction(this.converter)){
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this.converter = {convert: this.converter};
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}
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}
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},
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getValue: function(/*Object||Array*/defaultObject){
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// summary:
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// Return a value of an object
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// description:
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// This method first determins a root object as follows:
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// 1. If 'object' property specified,
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// 1.1 If 'object' is a Wire, its getValue() method is called to
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// obtain a root object.
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// 1.2 Otherwise, use 'object' as a root object.
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// 2. Otherwise, use 'defaultObject' argument.
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// 3. If 'property' is specified, it is used to get a property
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// value.
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// Then, if a sub-class implements _getValue() method, it is
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// called with the root object to get the return value.
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// Otherwise, the root object (typically, a property valye) is
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// used for the return value.
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// Finally, if 'type' property is specified, the return value is
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// converted to the specified primitive type ("string", "number",
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// "boolean" and "array").
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// If 'converter' property is specified, its convert() method is
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// called to convert the value.
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// defaultObject:
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// A default root object
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// returns:
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// A value found
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var object = undefined;
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if(dojox.wire.isWire(this.object)){
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object = this.object.getValue(defaultObject);
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}else{
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object = (this.object || defaultObject);
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}
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if(this.property){
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var list = this.property.split('.');
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for(var i in list){
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if(!object){
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return object; //anything (null, undefined, etc)
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}
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object = this._getPropertyValue(object, list[i]);
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}
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}
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var value = undefined;
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if(this._getValue){
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value = this._getValue(object);
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}else{
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value = object;
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}
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if(value){
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if(this.type){
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if(this.type == "string"){
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value = value.toString();
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}else if(this.type == "number"){
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value = parseInt(value, 10);
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}else if(this.type == "boolean"){
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value = (value != "false");
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}else if(this.type == "array"){
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if(!dojo.isArray(value)){
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value = [value];
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}
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}
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}
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if(this.converter && this.converter.convert){
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value = this.converter.convert(value, this); // optional "this" context
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}
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}
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return value; //anything
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},
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setValue: function(/*anything*/value, /*Object||Array*/defaultObject){
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// summary:
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// Set a value to an object
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// description:
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// This method first determins a root object as follows:
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// 1. If 'object' property specified,
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// 1.1 If 'object' is a Wire, its getValue() method is called to
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// obtain a root object.
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// 1.2 Otherwise, use 'object' as a root object.
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// 2. Otherwise, use 'defaultObject' argument.
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// 3. If 'property' is specified, it is used to get a property
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// value.
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// Then, if a sub-class implements _setValue() method, it is
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// called with the root object and 'value' argument to set
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// the value.
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// Otherwise, 'value' is set to a property specified with
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// 'property' property.
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// If the root object is undefined and 'object' property is a Wire
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// and a new object is created and returned by _setValue() it is
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// set through 'object' (setValue() method).
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// value:
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// A value to set
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// defaultObject:
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// A default root object
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var object = undefined;
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if(dojox.wire.isWire(this.object)){
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object = this.object.getValue(defaultObject);
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}else{
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object = (this.object || defaultObject);
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}
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var property = undefined;
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var o;
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if(this.property){
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if(!object){
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if(dojox.wire.isWire(this.object)){
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object = {};
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this.object.setValue(object, defaultObject);
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}else{
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throw new Error(this._wireClass + ".setValue(): invalid object");
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}
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}
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var list = this.property.split('.');
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var last = list.length - 1;
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for(var i = 0; i < last; i++){
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var p = list[i];
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o = this._getPropertyValue(object, p);
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if(!o){
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o = {};
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this._setPropertyValue(object, p, o);
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}
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object = o;
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}
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property = list[last];
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}
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if(this._setValue){
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if(property){
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o = this._getPropertyValue(object, property);
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if(!o){
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o = {};
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this._setPropertyValue(object, property, o);
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}
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object = o;
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}
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var newObject = this._setValue(object, value);
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if(!object && newObject){
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if(dojox.wire.isWire(this.object)){
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this.object.setValue(newObject, defaultObject);
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}else{
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throw new Error(this._wireClass + ".setValue(): invalid object");
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}
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}
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}else{
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if(property){
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this._setPropertyValue(object, property, value);
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}else{
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if(dojox.wire.isWire(this.object)){
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this.object.setValue(value, defaultObject);
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}else{
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throw new Error(this._wireClass + ".setValue(): invalid property");
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}
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}
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}
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},
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_getPropertyValue: function(/*Object||Array*/object, /*String*/property){
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// summary:
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// Return a property value of an object
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// description:
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// A value for 'property' of 'object' is returned.
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// If 'property' ends with an array index, it is used to indentify
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// an element of an array property.
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// If 'object' implements getPropertyValue(), it is called with
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// 'property' to obtain the property value.
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// If 'object' implements a getter for the property, it is called
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// to obtain the property value.
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// object:
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// A default root object
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// property:
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// A property name
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// returns:
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// A value found, otherwise 'undefined'
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var value = undefined;
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var i1 = property.indexOf('[');
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if(i1 >= 0){
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var i2 = property.indexOf(']');
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var index = property.substring(i1 + 1, i2);
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var array = null;
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if(i1 === 0){ // object is array
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array = object;
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}else{
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property = property.substring(0, i1);
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array = this._getPropertyValue(object, property);
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if(array && !dojo.isArray(array)){
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array = [array];
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}
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}
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if(array){
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value = array[index];
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}
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}else if(object.getPropertyValue){
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value = object.getPropertyValue(property);
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}else{
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var getter = "get" + property.charAt(0).toUpperCase() + property.substring(1);
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if(this._useAttr(object)){
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value = object.attr(property);
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} else if(object[getter]){
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value = object[getter]();
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}else{
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value = object[property];
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}
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}
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return value; //anything
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},
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_setPropertyValue: function(/*Object||Array*/object, /*String*/property, /*anything*/value){
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// summary:
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// Set a property value to an object
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// description:
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// 'value' is set to 'property' of 'object'.
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// If 'property' ends with an array index, it is used to indentify
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// an element of an array property to set the value.
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// If 'object' implements setPropertyValue(), it is called with
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// 'property' and 'value' to set the property value.
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// If 'object' implements a setter for the property, it is called
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// with 'value' to set the property value.
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// object:
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// An object
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// property:
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// A property name
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// value:
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// A value to set
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var i1 = property.indexOf('[');
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if(i1 >= 0){
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var i2 = property.indexOf(']');
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var index = property.substring(i1 + 1, i2);
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var array = null;
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if(i1 === 0){ // object is array
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array = object;
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}else{
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property = property.substring(0, i1);
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array = this._getPropertyValue(object, property);
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if(!array){
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array = [];
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this._setPropertyValue(object, property, array);
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}
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}
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array[index] = value;
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}else if(object.setPropertyValue){
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object.setPropertyValue(property, value);
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}else{
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var setter = "set" + property.charAt(0).toUpperCase() + property.substring(1);
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if(this._useAttr(object)){
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object.attr(property, value);
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}else if(object[setter]){
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object[setter](value);
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}else{
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object[property] = value;
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}
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}
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},
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_useAttr: function(object) {
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// summary:
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// Function to detect if dijit.attr support exists on the target
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// object:
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// The target object to set the property of.
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var useAttr = false;
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if(dojo.isFunction(object.attr)){
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useAttr = true;
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}
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return useAttr;
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}
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});
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