content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.weex.utils;
  
  import java.lang.reflect.InvocationHandler;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.lang.reflect.Proxy;
  
  public class WXInterception {
  
    private WXInterception() {
    }
  
    @SuppressWarnings("unchecked")
    public static <T> T proxy(final Object delegatee, final Class<T> interface_class, final InterceptionHandler<T> handler) throws IllegalArgumentException {
      if (delegatee instanceof Intercepted) {
        return (T) delegatee;
      }
      handler.setDelegate((T) delegatee);
      return (T) Proxy.newProxyInstance(WXInterception.class.getClassLoader(), new Class<?>[]{interface_class, Intercepted.class}, handler);
    }
  
    @SuppressWarnings("unchecked")
    public static <T> T proxy(final Object delegatee, final InterceptionHandler<T> handler, final Class<?>... interfaces) throws IllegalArgumentException {
      //if (Proxy.isProxyClass(delegatee.getClass())) return (T) delegatee;
      handler.setDelegate((T) delegatee);
      return (T) Proxy.newProxyInstance(WXInterception.class.getClassLoader(), interfaces, handler);
    }
  
    private interface Intercepted {
  
    }        // A mark to identify our proxy class
  
    /**
     * Derive this class and override {@link #invoke(Object, Method, Object[])} to implement an
     * interception handler.
     */
    public abstract static class InterceptionHandler<T> implements InvocationHandler {
  
      private T mDelegate;
  
      /**
       * Derived class should override this method and call <code>super.invoke(...)</code> to delegate the
       * procedure to original delegate instance if needed.
       *
       * @param proxy is ignored, instead the actual delegate instance will be used to invoke this method on.
       */
      @Override
      public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
        try {
          return method.invoke(delegate(), args);
        } catch (IllegalArgumentException e) {/* Should never happen */
          WXLogUtils.e("", e);
          return null;
        } catch (IllegalAccessException e) {/* Should never happen */
          WXLogUtils.e("", e);
          return null;
        } catch (InvocationTargetException e) {
          throw e.getTargetException();
        }
      }
  
      protected T delegate() {
        return mDelegate;
      }
  
      void setDelegate(final T delegate) {
        mDelegate = delegate;
      }
    }
  }
  