content: /*
   * Original work Copyright (c) 2005-2008, The Android Open Source Project
   * Modified work Copyright (c) 2013, rovo89 and Tungstwenty
   * Modified work Copyright (c) 2015, Alibaba Mobile Infrastructure (Android) Team
   *
   * 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.taobao.android.dexposed;
  
  
  public abstract class XC_MethodReplacement extends XC_MethodHook {
  	public XC_MethodReplacement() {
  		super();
  	}
  	public XC_MethodReplacement(int priority) {
  		super(priority);
  	}
  	
  	@Override
  	protected final void beforeHookedMethod(MethodHookParam param) throws Throwable {
  		try {
  			Object result = replaceHookedMethod(param);
  			param.setResult(result);
  		} catch (Throwable t) {
  			param.setThrowable(t);
  		}
  	}
  	
  	protected final void afterHookedMethod(MethodHookParam param) throws Throwable {}
  	
  	/**
  	 * Shortcut for replacing a method completely. Whatever is returned/thrown here is taken
  	 * instead of the result of the original method (which will not be called).
  	 */
  	protected abstract Object replaceHookedMethod(MethodHookParam param) throws Throwable;
  	
  	public static final XC_MethodReplacement DO_NOTHING = new XC_MethodReplacement(PRIORITY_HIGHEST*2) {
      	@Override
      	protected Object replaceHookedMethod(MethodHookParam param) throws Throwable {
      		return null;
      	};
  	};
  	
  	/**
  	 * Creates a callback which always returns a specific value
  	 */
  	public static XC_MethodReplacement returnConstant(final Object result) {
  		return returnConstant(PRIORITY_DEFAULT, result);
  	}
  	
  	/**
  	 * @see #returnConstant(Object)
  	 */
  	public static XC_MethodReplacement returnConstant(int priority, final Object result) {
  		return new XC_MethodReplacement(priority) {
  			@Override
  			protected Object replaceHookedMethod(MethodHookParam param) throws Throwable {
  				return result;
  			}
  		};
  	}
  	
  	
  	/**
  	 * 
  	 * Note: This class used for distinguish the Method cann't unhook.
  	 *
  	 */	
  	public abstract class XC_MethodKeepReplacement extends XC_MethodReplacement {
  		public XC_MethodKeepReplacement() {
  			super();
  		}
  		public XC_MethodKeepReplacement(int priority) {
  			super(priority);
  		}
  	}
  
  }
  