ReflectUtils.java

package com.tencent.tws.assistant.utils;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;

import android.util.Log;

public class ReflectUtils {
	private static final String TAG = "com.tencent.tws.assistant.utils.ReflectUtils";
	public static int gCallFieldNums = 0;
	public static int gCallMethodNums = 0;
	

	private static HashMap<String, ReflectClassComponent> mReflectFileds = new HashMap<String, ReflectClassComponent>();
	static class ReflectClassComponent{
		//String clsName;
		HashMap<String, Field> fields;
		HashMap<String, Method> methods; //method_name + param
	}	
	
	public ReflectUtils() {
		// TODO Auto-generated constructor stub
	}
	
	public static Field getDeclaredField(Class<?> cls, String fieldName) {
		ReflectClassComponent tmpRcc = mReflectFileds.get(cls.getName());
		if (tmpRcc == null) {
			tmpRcc = new ReflectClassComponent();
			tmpRcc.fields = new HashMap<String, Field>();
			tmpRcc.methods = new HashMap<String, Method>();
			mReflectFileds.put(cls.getName(), tmpRcc);
		} 
		
		Field field = tmpRcc.fields.get(fieldName);
		if (field != null) {
			//Log.d(TAG, "getDeclaredField| field=" + field.getName());
			return field;
		}
		
		//Log.d(TAG, "getDeclaredField|cls.getName=" + cls.getName() + ", fieldName=" + fieldName + ", tmpRcc.fields.size =" + tmpRcc.fields.size());
		
		gCallFieldNums ++ ;
		try {
			field = cls.getDeclaredField(fieldName);
			field.setAccessible(true);
			tmpRcc.fields.put(fieldName, field);
			return field;
		} catch (NoSuchFieldException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		Log.e(TAG, "getFieldValue|cls=" + cls + ", fieldName=" + fieldName);
		
		return null;
	}
	
	public static Object getFieldValue(Field field, Object object) {
		try {
			return field.get(object);
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		Log.e(TAG, "getFieldValue|field="+field);
		
		return null;
	}
	
	@Deprecated
	public static Object getFieldValue(String fieldName, Object object) {
		Field field = getDeclaredField(object.getClass(), fieldName);
		
		return getFieldValue(field, object);
	}
	
	public static Object getFieldValue(String fieldName, Object object, Class<?> clz) {
		Field field = getDeclaredField(clz, fieldName);
		
		return getFieldValue(field, object);
	}
	
	public static void setFieldValue(Object object, Field field, Object value) {
		try {
			field.set(object, value);
			return;
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}

		Log.d(TAG, "setFieldValue|field=" + field + ", value="+value);
	}
	
	public static Method getDeclaredMethod(Class<?> clz, String methodName, Class<?>... parameterTypes) {
		if(clz == null)
			return null;
		
		ReflectClassComponent tmpRcc = mReflectFileds.get(clz.getName());
		if (tmpRcc == null) {
			tmpRcc = new ReflectClassComponent();
			tmpRcc.fields = new HashMap<String, Field>();
			tmpRcc.methods = new HashMap<String, Method>();
			mReflectFileds.put(clz.getName(), tmpRcc);
		}
		String methodKey = new String(methodName); //methodName+param
		int len = parameterTypes.length;
		for (int i = 0; i < len; i++) {
			methodKey = methodKey + "_" + parameterTypes[i].getSimpleName();
		}
		Method method = tmpRcc.methods.get(methodKey);
		if (method != null) {
			return method;
		}
		//Log.d(TAG, "getDeclaredMethod|clz=" + clz.getName() + ", methodKey=" + methodKey);
		
		gCallMethodNums ++ ;
		
		try {
			method = clz.getDeclaredMethod(methodName, parameterTypes);
			method.setAccessible(true);
			tmpRcc.methods.put(methodKey, method);
			return method;
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		Log.e(TAG, "getDeclaredMethod|clz=" + clz + ", methodName=" + methodName);
		
		return null;
	}
	
	public static Constructor<?> getDeclaredConstructor(Class<?> clz, Class<?>... parameterTypes) {
		gCallMethodNums ++ ;
		try {
			Constructor<?> constructor = clz.getDeclaredConstructor(parameterTypes);
			constructor.setAccessible(true);
			return constructor;
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		Log.e(TAG, "getDeclaredConstructor|clz="+clz);
		
		return null;
	}
	
	public static Object invoke(Method method, Object receiver, Object... args) {
		if(method == null)
			return null;
		
		try {
			return method.invoke(receiver, args);
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		Log.e(TAG, "invoke|method="+method);
		
		return null;
	}
	
	public static Class<?> forClassName(String className) {
		try {
			return Class.forName(className);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		
		Log.e(TAG, "forClassName|className="+className);
		
		return null;
	}
}