75 lines
1.8 KiB
JavaScript
75 lines
1.8 KiB
JavaScript
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dojo.provide("dojox.lang.oo.aop");
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dojo.require("dojox.lang.oo.Decorator");
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dojo.require("dojox.lang.oo.chain");
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dojo.require("dojox.lang.oo.general");
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(function(){
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var oo = dojox.lang.oo, md = oo.makeDecorator, ooa = oo.aop;
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// five decorators implementing light-weight AOP weaving
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/*=====
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ooa.before = md(function(name, newValue, oldValue){
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// summary: creates a "before" advise, by calling new function
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// before the old one
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// dummy body
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});
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ooa.around = md(function(name, newValue, oldValue){
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// summary: creates an "around" advise,
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// the previous value is passed as a first argument and can be null,
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// arguments are passed as a second argument
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// dummy body
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});
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=====*/
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// reuse existing decorators
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ooa.before = oo.chain.before;
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ooa.around = oo.general.wrap;
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ooa.afterReturning = md(function(name, newValue, oldValue){
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// summary: creates an "afterReturning" advise,
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// the returned value is passed as the only argument
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return dojo.isFunction(oldValue) ?
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function(){
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var ret = oldValue.apply(this, arguments);
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newValue.call(this, ret);
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return ret;
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} : function(){ newValue.call(this); };
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});
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ooa.afterThrowing = md(function(name, newValue, oldValue){
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// summary: creates an "afterThrowing" advise,
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// the exception is passed as the only argument
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return dojo.isFunction(oldValue) ?
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function(){
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var ret;
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try{
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ret = oldValue.apply(this, arguments);
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}catch(e){
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newValue.call(this, e);
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throw e;
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}
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return ret;
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} : oldValue;
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});
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ooa.after = md(function(name, newValue, oldValue){
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// summary: creates an "after" advise,
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// it takes no arguments
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return dojo.isFunction(oldValue) ?
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function(){
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var ret;
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try{
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ret = oldValue.apply(this, arguments);
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}finally{
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newValue.call(this);
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}
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return ret;
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} : function(){ newValue.call(this); }
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});
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})();
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