content: /*
   * EmptyMatcher.java May 2007
   *
   * Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net>
   *
   * 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.
   */
  
  package com.aliyun.odps.simpleframework.xml.core;
  
  import com.aliyun.odps.simpleframework.xml.transform.Matcher;
  import com.aliyun.odps.simpleframework.xml.transform.Transform;
  import com.aliyun.odps.simpleframework.xml.transform.Transformer;
  
  /**
   * The <code>EmptyMatcher</code> object is used as a delegate type 
   * that is used when no user specific matcher is specified. This
   * ensures that no transform is resolved for a specified type, and
   * allows the normal resolution of the stock transforms.
   * 
   * @author Niall Gallagher
   * 
   * @see Transformer
   */
  class EmptyMatcher implements Matcher {
  
     /**
      * This method is used to return a null value for the transform.
      * Returning a null value allows the normal resolution of the
      * stock transforms to be used when no matcher is specified.
      * 
      * @param type this is the type that is expecting a transform
      * 
      * @return this transform will always return a null value
      */
     public Transform match(Class type) throws Exception {
        return null;
     }
  }
  