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107 lines
3.6 KiB
JavaScript
107 lines
3.6 KiB
JavaScript
define("dojo/AdapterRegistry", ["./_base/kernel", "./_base/lang"], function(dojo, lang){
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// module:
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// dojo/AdapterRegistry
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var AdapterRegistry = dojo.AdapterRegistry = function(/*Boolean?*/ returnWrappers){
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// summary:
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// A registry to make contextual calling/searching easier.
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// description:
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// Objects of this class keep list of arrays in the form [name, check,
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// wrap, directReturn] that are used to determine what the contextual
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// result of a set of checked arguments is. All check/wrap functions
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// in this registry should be of the same arity.
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// example:
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// | // create a new registry
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// | var reg = new dojo.AdapterRegistry();
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// | reg.register("handleString",
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// | dojo.isString,
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// | function(str){
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// | // do something with the string here
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// | }
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// | );
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// | reg.register("handleArr",
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// | dojo.isArray,
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// | function(arr){
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// | // do something with the array here
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// | }
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// | );
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// |
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// | // now we can pass reg.match() *either* an array or a string and
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// | // the value we pass will get handled by the right function
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// | reg.match("someValue"); // will call the first function
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// | reg.match(["someValue"]); // will call the second
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this.pairs = [];
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this.returnWrappers = returnWrappers || false; // Boolean
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};
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lang.extend(AdapterRegistry, {
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register: function(/*String*/ name, /*Function*/ check, /*Function*/ wrap, /*Boolean?*/ directReturn, /*Boolean?*/ override){
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// summary:
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// register a check function to determine if the wrap function or
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// object gets selected
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// name:
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// a way to identify this matcher.
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// check:
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// a function that arguments are passed to from the adapter's
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// match() function. The check function should return true if the
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// given arguments are appropriate for the wrap function.
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// directReturn:
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// If directReturn is true, the value passed in for wrap will be
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// returned instead of being called. Alternately, the
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// AdapterRegistry can be set globally to "return not call" using
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// the returnWrappers property. Either way, this behavior allows
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// the registry to act as a "search" function instead of a
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// function interception library.
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// override:
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// If override is given and true, the check function will be given
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// highest priority. Otherwise, it will be the lowest priority
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// adapter.
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this.pairs[((override) ? "unshift" : "push")]([name, check, wrap, directReturn]);
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},
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match: function(/* ... */){
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// summary:
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// Find an adapter for the given arguments. If no suitable adapter
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// is found, throws an exception. match() accepts any number of
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// arguments, all of which are passed to all matching functions
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// from the registered pairs.
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for(var i = 0; i < this.pairs.length; i++){
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var pair = this.pairs[i];
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if(pair[1].apply(this, arguments)){
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if((pair[3])||(this.returnWrappers)){
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return pair[2];
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}else{
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return pair[2].apply(this, arguments);
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}
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}
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}
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throw new Error("No match found");
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},
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unregister: function(name){
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// summary:
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// Remove a named adapter from the registry
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// name: String
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// The name of the adapter.
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// returns: Boolean
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// Returns true if operation is successful.
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// Returns false if operation fails.
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// FIXME: this is kind of a dumb way to handle this. On a large
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// registry this will be slow-ish and we can use the name as a lookup
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// should we choose to trade memory for speed.
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for(var i = 0; i < this.pairs.length; i++){
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var pair = this.pairs[i];
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if(pair[0] == name){
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this.pairs.splice(i, 1);
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return true;
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}
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}
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return false;
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}
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});
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return AdapterRegistry;
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});
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