as2lib 0.9

     1  /*
     2   * Copyright the original author or authors.
     3   * 
     4   * Licensed under the MOZILLA PUBLIC LICENSE, Version 1.1 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   * 
     8   *      http://www.mozilla.org/MPL/MPL-1.1.html
     9   * 
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  import org.as2lib.core.BasicClass;
    18  import org.as2lib.env.reflect.ProxyFactory;
    19  import org.as2lib.env.reflect.InvocationHandler;
    20  
    21  /**
    22   * {@code InterfaceProxyFacotry} creates proxies for interfaces. It can only be
    23   * used in conjunction with interfaces, not classes.
    24   * 
    25   * <p>It offers a higher performance than the {@code TypeProxyFactory} which can
    26   * also be used with classes.
    27   *
    28   * @author Simon Wacker
    29   * @see org.as2lib.env.reflect.TypeProxyFactory
    30   */
    31  class org.as2lib.env.reflect.InterfaceProxyFactory extends BasicClass implements ProxyFactory {
    32  	
    33  	/**
    34  	 * Creates proxies for interfaces.
    35  	 *
    36  	 * <p>You can cast the returned proxy to the passed-in {@code interfaze}.
    37  	 * 
    38  	 * <p>{@code null} will be returned if the passed-in {@code interfaze} is {@code null}
    39  	 * or {@code undefined}.
    40  	 * 
    41  	 * <p>The returned proxy catches method invocations by using {@code __resolve}.
    42  	 *
    43  	 * <p>Note that also methods that are not declared on the passed-in {@code interfaze}
    44  	 * but that are invoked on the returned proxy, get forwarded to the passed-in
    45  	 * {@code handler}.
    46  	 * 
    47  	 * @param interfaze the interface to create the proxy for
    48  	 * @param handler the handler to invoke on method invocations on the returned proxy
    49  	 * @return the created interface proxy
    50  	 */
    51  	public function createProxy(interfaze:Function, handler:InvocationHandler) {
    52  		if (!interfaze) return null;
    53  		var result:Object = new Object();
    54  		result.__proto__ = interfaze.prototype;
    55  		result.__constructor__ = interfaze;
    56  		result.__resolve = function(methodName:String):Function {
    57  			return (function() {
    58  				return handler.invoke(this, methodName, arguments);
    59  			});
    60  		};
    61  		return result;
    62  	}
    63  	
    64  }