egroupware/api/js/etemplate/et2_core_inheritance.ts
nathangray 39590368bf Hopefully last attribute inheritance bug fix, solves a lot of the console warnings.
Just swapping the function parameter order, since we called the function from every constructor.
2020-02-10 11:41:40 -07:00

269 lines
6.1 KiB
TypeScript

/**
* EGroupware eTemplate2 - JS code for implementing inheritance with attributes
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage api
* @link: https://www.egroupware.org
* @author Andreas Stöckel
*/
/*egw:uses
et2_core_common;
*/
import '../jsapi/egw_global';
import 'et2_core_common';
export class ClassWithAttributes
{
/**
* Object to collect the attributes we operate on
*/
attributes: object;
/**
* Returns the value of the given attribute. If the property does not
* exist, an error message is issued.
*
* @param {string} _name
* @return {*}
*/
getAttribute(_name) {
if (typeof this.attributes[_name] != "undefined" &&
!this.attributes[_name].ignore)
{
if (typeof this["get_" + _name] == "function")
{
return this["get_" + _name]();
}
else
{
return this[_name];
}
}
else
{
egw.debug("error", this, "Attribute '" + _name + "' does not exist!");
}
}
/**
* The setAttribute function sets the attribute with the given name to
* the given value. _override defines, whether this[_name] will be set,
* if this key already exists. _override defaults to true. A warning
* is issued if the attribute does not exist.
*
* @param {string} _name
* @param {*} _value
* @param {boolean} _override
*/
setAttribute(_name, _value, _override)
{
if (typeof this.attributes[_name] != "undefined")
{
if (!this.attributes[_name].ignore)
{
if (typeof _override == "undefined")
{
_override = true;
}
var val = et2_checkType(_value, this.attributes[_name].type,
_name, this);
if (typeof this["set_" + _name] == "function")
{
this["set_" + _name](val);
}
else if (_override || typeof this[_name] == "undefined")
{
this[_name] = val;
}
}
}
else
{
egw.debug("warn", this, "Attribute '" + _name + "' does not exist!");
}
}
/**
* generateAttributeSet sanitizes the given associative array of attributes
* (by passing each entry to "et2_checkType" and checking for existance of
* the attribute) and adds the default values to the associative array.
*
* @param {object} _attrs is the associative array containing the attributes.
*/
static generateAttributeSet(widget, _attrs)
{
// Sanity check and validation
for (var key in _attrs)
{
if (typeof widget[key] != "undefined")
{
if (!widget[key].ignore)
{
_attrs[key] = et2_checkType(_attrs[key], widget[key].type,
key, this);
}
}
else
{
// Key does not exist - delete it and issue a warning
delete(_attrs[key]);
egw.debug("warn", this, "Attribute '" + key +
"' does not exist in " + _attrs.type+"!");
}
}
// Include default values or already set values for this attribute
for (var key in widget)
{
if (typeof _attrs[key] == "undefined")
{
var _default = widget[key]["default"];
if (_default == et2_no_init)
{
_default = undefined;
}
_attrs[key] = _default;
}
}
return _attrs;
}
/**
* The initAttributes function sets the attributes to their default
* values. The attributes are not overwritten, which means, that the
* default is only set, if either a setter exists or this[propName] does
* not exist yet.
*
* @param {object} _attrs is the associative array containing the attributes.
*/
initAttributes(_attrs)
{
for (var key in _attrs)
{
if (typeof this.attributes[key] != "undefined" && !this.attributes[key].ignore && !(_attrs[key] == undefined))
{
this.setAttribute(key, _attrs[key], false);
}
}
}
static buildAttributes(class_prototype: object)
{
let class_tree = [];
let attributes = {};
let n = 0;
do
{
n++;
class_tree.push(class_prototype);
class_prototype = Object.getPrototypeOf(class_prototype);
} while (class_prototype !== ClassWithAttributes && n < 50);
for(let i = class_tree.length - 1; i >= 0; i--)
{
attributes = ClassWithAttributes.extendAttributes(attributes, class_tree[i]._attributes);
}
return attributes;
}
/**
* Extend current _attributes with the one from the parent class
*
* This gives inheritance from the parent plus the ability to override in the current class.
*
* @param _attributes
* @param _parent
*/
static extendAttributes(_parent : object, _attributes : object) : object
{
function _copyMerge(_new, _old)
{
var result = {};
// Copy the new object
if (typeof _new != "undefined")
{
for (var key in _new)
{
result[key] = _new[key];
}
}
// Merge the old object
for (var key in _old)
{
if (typeof result[key] == "undefined")
{
result[key] = _old[key];
}
}
return result;
}
var attributes = {};
// Copy the old attributes
for (var key in _attributes)
{
attributes[key] = _copyMerge({}, _attributes[key]);
}
// Add the old attributes to the new ones. If the attributes already
// exist, they are merged.
for (var key in _parent)
{
var _old = _parent[key];
attributes[key] = _copyMerge(attributes[key], _old);
}
// Validate the attributes
for (var key in attributes)
{
et2_validateAttrib(key, attributes[key]);
}
return attributes;
}
/**
* The implements function can be used to check whether the object
* implements the given interface.
*
* As TypeScript can not (yet) check if an objects implements an interface on runtime,
* we currently implements with each interface a function called 'implements_'+interfacename
* to be able to check here.
*
* @param _iface name of interface to check
*/
implements (_iface_name : string)
{
if (typeof window['implements_'+_iface_name] === 'function' &&
window['implements_'+_iface_name](this))
{
return true
}
return false;
}
/**
* Check if object is an instance of a class or implements an interface (specified by the interfaces name)
*
* @param _class_or_interfacename class(-name) or string with name of interface
*/
instanceOf(_class_or_interfacename: any) : boolean
{
if (typeof _class_or_interfacename === 'string')
{
return this.implements(_class_or_interfacename);
}
return this instanceof _class_or_interfacename;
}
}