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;
  
  import java.lang.reflect.Member;
  
  import com.taobao.android.dexposed.callbacks.IXUnhook;
  import com.taobao.android.dexposed.callbacks.XCallback;
  
  public abstract class XC_MethodHook extends XCallback {
  	public XC_MethodHook() {
  		super();
  	}
  	public XC_MethodHook(int priority) {
  		super(priority);
  	}
  	
  	/**
  	 * Called before the invocation of the method.
  	 * <p>Can use {@link MethodHookParam#setResult(Object)} and {@link MethodHookParam#setThrowable(Throwable)}
  	 * to prevent the original method from being called.
  	 */
  	protected void beforeHookedMethod(MethodHookParam param) throws Throwable {}
  	
  	/**
  	 * Called after the invocation of the method.
  	 * <p>Can use {@link MethodHookParam#setResult(Object)} and {@link MethodHookParam#setThrowable(Throwable)}
  	 * to modify the return value of the original method.
  	 */
  	protected void afterHookedMethod(MethodHookParam param) throws Throwable  {}
  	
  	
  	public static class MethodHookParam extends XCallback.Param {
  		/** Description of the hooked method */
  		public Member method;
  		/** The <code>this</code> reference for an instance method, or null for static methods */
  		public Object thisObject;
  		/** Arguments to the method call */
  		public Object[] args;
  		
  		private Object result = null;
  		private Throwable throwable = null;
  		/* package */ boolean returnEarly = false;
  		
  		/** Returns the result of the method call */
  		public Object getResult() {
  			return result;
  		}
  		
  		/**
  		 * Modify the result of the method call. In a "before-method-call"
  		 * hook, prevents the call to the original method.
  		 * You still need to "return" from the hook handler if required.
  		 */
  		public void setResult(Object result) {
  			this.result = result;
  			this.throwable = null;
  			this.returnEarly = true;
  		}
  		
  		/** Returns the <code>Throwable</code> thrown by the method, or null */
  		public Throwable getThrowable() {
  			return throwable;
  		}
  		
  		/** Returns true if an exception was thrown by the method */
  		public boolean hasThrowable() {
  			return throwable != null;
  		}
  		
  		/**
  		 * Modify the exception thrown of the method call. In a "before-method-call"
  		 * hook, prevents the call to the original method.
  		 * You still need to "return" from the hook handler if required.
  		 */
  		public void setThrowable(Throwable throwable) {
  			this.throwable = throwable;
  			this.result = null;
  			this.returnEarly = true;
  		}
  		
  		/** Returns the result of the method call, or throws the Throwable caused by it */
  		public Object getResultOrThrowable() throws Throwable {
  			if (throwable != null)
  				throw throwable;
  			return result;
  		}
  	}
  
  	public class Unhook implements IXUnhook {
  		private final Member hookMethod;
  
  		public Unhook(Member hookMethod) {
  			this.hookMethod = hookMethod;
  		}
  		
  		public Member getHookedMethod() {
  			return hookMethod;
  		}
  		
  		public XC_MethodHook getCallback() {
  			return XC_MethodHook.this;
  		}
  
  		@Override
  		public void unhook() {
  			DexposedBridge.unhookMethod(hookMethod, XC_MethodHook.this);
  		}
  
  	}
  	
  	/**
  	 * 
  	 * Note: This class used for distinguish the Method cann't unhook.
  	 *
  	 */	
  	public abstract class XC_MethodKeepHook extends XC_MethodHook {
  		
  		public XC_MethodKeepHook() {
  			super();
  		}
  		public XC_MethodKeepHook(int priority) {
  			super(priority);
  		}
  
  	}
  
  
  }
  
  
  