context.js

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/*
* Copyright 2001-2007 Hippo (www.hippo.nl)
*
* Licensed 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.
*/


/**
 * default context
 * Simple port of Avalon context, through which runtime context can be applied 
 * by a manager on a component. 
 */
 
function DefaultContext() {
  if(!Cfx.Class.IsDefined(DefaultContext)) {
    Cfx.Class.New(DefaultContext);
  
    if(Cfx.Class.IsInitializing(DefaultContext)) {
       DefaultContext.Method(get);
       DefaultContext.Method(has);
       DefaultContext.Method(put);       

       return;
    }
  }

  this.InitInstance();
  
  /**
   *  @param 	DefaultContext
   */
  if(arguments.length) {
    this.parentContext = arguments[0];
  } 
  this.context = new Array();
  
  return this;

  function get(key) {
    var entry = this.context[key];
    if (entry != null) {
      return entry;
    }
    if (this.parentContext != null) {
      return this.parentContext.get(key);
    }
    throw new Error("Context-entry for " + key + " not found!");  
  }
  
  function has(key) {
    if (this.context[key] != null) {
      return true;
    }
    if (this.parentContext != null ) {
      return this.parentContext.has(key);
    }
    return false;  
  }
  
  function put(key, entry) {
    this.context[key] = entry;
  }
}