content:  /*
   *  Copyright Beijing 58 Information Technology Co.,Ltd.
   *
   *  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 com.bj58.argo.thirdparty;
  
  
   import com.google.common.base.Preconditions;
  
   import java.lang.reflect.*;
   import java.sql.SQLException;
   import java.util.ArrayList;
   import java.util.Arrays;
   import java.util.List;
  
  
   /**
    * 反射工具类
    *
    * @author Service Platform Architecture Team (spat@58.com)
    */
   public abstract class ReflectionUtils {
  
       /**
        * Attempt to find a {@link java.lang.reflect.Field field} on the supplied {@link Class} with the
        * supplied <code>name</code>. Searches all superclasses up to {@link Object}.
        * @param clazz the class to introspect
        * @param name the name of the field
        * @return the corresponding Field object, or <code>null</code> if not found
        */
       public static Field findField(Class<?> clazz, String name) {
           return findField(clazz, name, null);
       }
  
       /**
        * Attempt to find a {@link java.lang.reflect.Field field} on the supplied {@link Class} with the
        * supplied <code>name</code> and/or {@link Class type}. Searches all superclasses
        * up to {@link Object}.
        * @param clazz the class to introspect
        * @param name the name of the field (may be <code>null</code> if type is specified)
        * @param type the type of the field (may be <code>null</code> if name is specified)
        * @return the corresponding Field object, or <code>null</code> if not found
        */
       public static Field findField(Class<?> clazz, String name, Class<?> type) {
           Preconditions.checkNotNull(clazz, "Class must not be null");
           Preconditions.checkState(name != null || type != null, "Either name or type of the field must be specified");
           Class<?> searchType = clazz;
           while (!Object.class.equals(searchType) && searchType != null) {
               Field[] fields = searchType.getDeclaredFields();
               for (Field field : fields) {
                   if ((name == null || name.equals(field.getName())) && (type == null || type.equals(field.getType()))) {
                       return field;
                   }
               }
               searchType = searchType.getSuperclass();
           }
           return null;
       }
  
       /**
        * Set the field represented by the supplied {@link java.lang.reflect.Field field object} on the
        * specified {@link Object target object} to the specified <code>value</code>.
        * In accordance with {@link java.lang.reflect.Field#set(Object, Object)} semantics, the new value
        * is automatically unwrapped if the underlying field has a primitive type.
        * <p>Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}.
        * @param field the field to set
        * @param target the target object on which to set the field
        * @param value the value to set; may be <code>null</code>
        */
       public static void setField(Field field, Object target, Object value) {
           try {
               field.set(target, value);
           }
           catch (IllegalAccessException ex) {
               handleReflectionException(ex);
               throw new IllegalStateException("Unexpected reflection exception - " + ex.getClass().getName() + ": "
                       + ex.getMessage());
           }
       }
  
       /**
        * Get the field represented by the supplied {@link java.lang.reflect.Field field object} on the
        * specified {@link Object target object}. In accordance with {@link java.lang.reflect.Field#get(Object)}
        * semantics, the returned value is automatically wrapped if the underlying field
        * has a primitive type.
        * <p>Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}.
        * @param field the field to get
        * @param target the target object from which to get the field
        * @return the field's current value
        */
       public static Object getField(Field field, Object target) {
           try {
               return field.get(target);
           }
           catch (IllegalAccessException ex) {
               handleReflectionException(ex);
               throw new IllegalStateException(
                       "Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());
           }
       }
  
       /**
        * Attempt to find a {@link java.lang.reflect.Method} on the supplied class with the supplied name
        * and no parameters. Searches all superclasses up to <code>Object</code>.
        * <p>Returns <code>null</code> if no {@link java.lang.reflect.Method} can be found.
        * @param clazz the class to introspect
        * @param name the name of the method
        * @return the Method object, or <code>null</code> if none found
        */
       public static Method findMethod(Class<?> clazz, String name) {
           return findMethod(clazz, name, new Class[0]);
       }
  
       /**
        * Attempt to find a {@link java.lang.reflect.Method} on the supplied class with the supplied name
        * and parameter types. Searches all superclasses up to <code>Object</code>.
        * <p>Returns <code>null</code> if no {@link java.lang.reflect.Method} can be found.
        * @param clazz the class to introspect
        * @param name the name of the method
        * @param paramTypes the parameter types of the method
        * (may be <code>null</code> to indicate any signature)
        * @return the Method object, or <code>null</code> if none found
        */
       public static Method findMethod(Class<?> clazz, String name, Class<?>... paramTypes) {
           Preconditions.checkNotNull(clazz, "Class must not be null");
           Preconditions.checkNotNull(name, "Method name must not be null");
           Class<?> searchType = clazz;
           while (searchType != null) {
               Method[] methods = (searchType.isInterface() ? searchType.getMethods() : searchType.getDeclaredMethods());
               for (Method method : methods) {
                   if (name.equals(method.getName())
                           && (paramTypes == null || Arrays.equals(paramTypes, method.getParameterTypes()))) {
                       return method;
                   }
               }
               searchType = searchType.getSuperclass();
           }
           return null;
       }
  
       /**
        * Invoke the specified {@link java.lang.reflect.Method} against the supplied target object with no arguments.
        * The target object can be <code>null</code> when invoking a static {@link java.lang.reflect.Method}.
        * <p>Thrown exceptions are handled via a call to {@link #handleReflectionException}.
        * @param method the method to invoke
        * @param target the target object to invoke the method on
        * @return the invocation result, if any
        * @see #invokeMethod(java.lang.reflect.Method, Object, Object[])
        */
       public static Object invokeMethod(Method method, Object target) {
           return invokeMethod(method, target, new Object[0]);
       }
  
       /**
        * Invoke the specified {@link java.lang.reflect.Method} against the supplied target object with the
        * supplied arguments. The target object can be <code>null</code> when invoking a
        * static {@link java.lang.reflect.Method}.
        * <p>Thrown exceptions are handled via a call to {@link #handleReflectionException}.
        * @param method the method to invoke
        * @param target the target object to invoke the method on
        * @param args the invocation arguments (may be <code>null</code>)
        * @return the invocation result, if any
        */
       public static Object invokeMethod(Method method, Object target, Object... args) {
           try {
               return method.invoke(target, args);
           }
           catch (Exception ex) {
               handleReflectionException(ex);
           }
           throw new IllegalStateException("Should never get here");
       }
  
       /**
        * Invoke the specified JDBC API {@link java.lang.reflect.Method} against the supplied target
        * object with no arguments.
        * @param method the method to invoke
        * @param target the target object to invoke the method on
        * @return the invocation result, if any
        * @throws java.sql.SQLException the JDBC API SQLException to rethrow (if any)
        * @see #invokeJdbcMethod(java.lang.reflect.Method, Object, Object[])
        */
       public static Object invokeJdbcMethod(Method method, Object target) throws SQLException {
           return invokeJdbcMethod(method, target, new Object[0]);
       }
  
       /**
        * Invoke the specified JDBC API {@link java.lang.reflect.Method} against the supplied target
        * object with the supplied arguments.
        * @param method the method to invoke
        * @param target the target object to invoke the method on
        * @param args the invocation arguments (may be <code>null</code>)
        * @return the invocation result, if any
        * @throws java.sql.SQLException the JDBC API SQLException to rethrow (if any)
        * @see #invokeMethod(java.lang.reflect.Method, Object, Object[])
        */
       public static Object invokeJdbcMethod(Method method, Object target, Object... args) throws SQLException {
           try {
               return method.invoke(target, args);
           }
           catch (IllegalAccessException ex) {
               handleReflectionException(ex);
           }
           catch (InvocationTargetException ex) {
               if (ex.getTargetException() instanceof SQLException) {
                   throw (SQLException) ex.getTargetException();
               }
               handleInvocationTargetException(ex);
           }
           throw new IllegalStateException("Should never get here");
       }
  
       /**
        * Handle the given reflection exception. Should only be called if no
        * checked exception is expected to be thrown by the target method.
        * <p>Throws the underlying RuntimeException or Error in case of an
        * InvocationTargetException with such a root cause. Throws an
        * IllegalStateException with an appropriate message else.
        * @param ex the reflection exception to handle
        */
       public static void handleReflectionException(Exception ex) {
           if (ex instanceof NoSuchMethodException) {
               throw new IllegalStateException("Method not found: " + ex.getMessage());
           }
           if (ex instanceof IllegalAccessException) {
               throw new IllegalStateException("Could not access method: " + ex.getMessage());
           }
           if (ex instanceof InvocationTargetException) {
               handleInvocationTargetException((InvocationTargetException) ex);
           }
           if (ex instanceof RuntimeException) {
               throw (RuntimeException) ex;
           }
           handleUnexpectedException(ex);
       }
  
       /**
        * Handle the given invocation target exception. Should only be called if no
        * checked exception is expected to be thrown by the target method.
        * <p>Throws the underlying RuntimeException or Error in case of such a root
        * cause. Throws an IllegalStateException else.
        * @param ex the invocation target exception to handle
        */
       public static void handleInvocationTargetException(InvocationTargetException ex) {
           rethrowRuntimeException(ex.getTargetException());
       }
  
       /**
        * Rethrow the given {@link Throwable exception}, which is presumably the
        * <em>target exception</em> of an {@link java.lang.reflect.InvocationTargetException}. Should
        * only be called if no checked exception is expected to be thrown by the
        * target method.
        * <p>Rethrows the underlying exception cast to an {@link RuntimeException} or
        * {@link Error} if appropriate; otherwise, throws an
        * {@link IllegalStateException}.
        * @param ex the exception to rethrow
        * @throws RuntimeException the rethrown exception
        */
       public static void rethrowRuntimeException(Throwable ex) {
           if (ex instanceof RuntimeException) {
               throw (RuntimeException) ex;
           }
           if (ex instanceof Error) {
               throw (Error) ex;
           }
           handleUnexpectedException(ex);
       }
  
       /**
        * Rethrow the given {@link Throwable exception}, which is presumably the
        * <em>target exception</em> of an {@link java.lang.reflect.InvocationTargetException}. Should
        * only be called if no checked exception is expected to be thrown by the
        * target method.
        * <p>Rethrows the underlying exception cast to an {@link Exception} or
        * {@link Error} if appropriate; otherwise, throws an
        * {@link IllegalStateException}.
        * @param ex the exception to rethrow
        * @throws Exception the rethrown exception (in case of a checked exception)
        */
       public static void rethrowException(Throwable ex) throws Exception {
           if (ex instanceof Exception) {
               throw (Exception) ex;
           }
           if (ex instanceof Error) {
               throw (Error) ex;
           }
           handleUnexpectedException(ex);
       }
  
       /**
        * Throws an IllegalStateException with the given exception as root cause.
        * @param ex the unexpected exception
        */
       private static void handleUnexpectedException(Throwable ex) {
           throw new IllegalStateException("Unexpected exception thrown", ex);
       }
  
       /**
        * Determine whether the given method explicitly declares the given
        * exception or one of its superclasses, which means that an exception of
        * that type can be propagated as-is within a reflective invocation.
        * @param method the declaring method
        * @param exceptionType the exception to throw
        * @return <code>true</code> if the exception can be thrown as-is;
        * <code>false</code> if it needs to be wrapped
        */
       public static boolean declaresException(Method method, Class<?> exceptionType) {
           Preconditions.checkNotNull(method, "Method must not be null");
           Class<?>[] declaredExceptions = method.getExceptionTypes();
           for (Class<?> declaredException : declaredExceptions) {
               if (declaredException.isAssignableFrom(exceptionType)) {
                   return true;
               }
           }
           return false;
       }
  
       /**
        * Determine whether the given field is a "public static final" constant.
        * @param field the field to check
        */
       public static boolean isPublicStaticFinal(Field field) {
           int modifiers = field.getModifiers();
           return (Modifier.isPublic(modifiers) && Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers));
       }
  
       /**
        * Determine whether the given method is an "equals" method.
        * @see Object#equals(Object)
        */
       public static boolean isEqualsMethod(Method method) {
           if (method == null || !method.getName().equals("equals")) {
               return false;
           }
           Class<?>[] paramTypes = method.getParameterTypes();
           return (paramTypes.length == 1 && paramTypes[0] == Object.class);
       }
  
       /**
        * Determine whether the given method is a "hashCode" method.
        * @see Object#hashCode()
        */
       public static boolean isHashCodeMethod(Method method) {
           return (method != null && method.getName().equals("hashCode") && method.getParameterTypes().length == 0);
       }
  
       /**
        * Determine whether the given method is a "toString" method.
        * @see Object#toString()
        */
       public static boolean isToStringMethod(Method method) {
           return (method != null && method.getName().equals("toString") && method.getParameterTypes().length == 0);
       }
  
       /**
        * Make the given field accessible, explicitly setting it accessible if
        * necessary. The <code>setAccessible(true)</code> method is only called
        * when actually necessary, to avoid unnecessary conflicts with a JVM
        * SecurityManager (if active).
        * @param field the field to make accessible
        * @see java.lang.reflect.Field#setAccessible
        */
       public static void makeAccessible(Field field) {
           if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers()) ||
                   Modifier.isFinal(field.getModifiers())) && !field.isAccessible()) {
               field.setAccessible(true);
           }
       }
  
       /**
        * Make the given method accessible, explicitly setting it accessible if
        * necessary. The <code>setAccessible(true)</code> method is only called
        * when actually necessary, to avoid unnecessary conflicts with a JVM
        * SecurityManager (if active).
        * @param method the method to make accessible
        * @see java.lang.reflect.Method#setAccessible
        */
       public static void makeAccessible(Method method) {
           if ((!Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method.getDeclaringClass().getModifiers()))
                   && !method.isAccessible()) {
               method.setAccessible(true);
           }
       }
  
       /**
        * Make the given constructor accessible, explicitly setting it accessible
        * if necessary. The <code>setAccessible(true)</code> method is only called
        * when actually necessary, to avoid unnecessary conflicts with a JVM
        * SecurityManager (if active).
        * @param ctor the constructor to make accessible
        * @see java.lang.reflect.Constructor#setAccessible
        */
       public static void makeAccessible(Constructor<?> ctor) {
           if ((!Modifier.isPublic(ctor.getModifiers()) || !Modifier.isPublic(ctor.getDeclaringClass().getModifiers()))
                   && !ctor.isAccessible()) {
               ctor.setAccessible(true);
           }
       }
  
       /**
        * Perform the given callback operation on all matching methods of the given
        * class and superclasses.
        * <p>The same named method occurring on subclass and superclass will appear
        * twice, unless excluded by a {@link MethodFilter}.
        * @param clazz class to start looking at
        * @param mc the callback to invoke for each method
        * @see #doWithMethods(Class, MethodCallback, MethodFilter)
        */
       public static void doWithMethods(Class<?> clazz, MethodCallback mc) throws IllegalArgumentException {
           doWithMethods(clazz, mc, null);
       }
  
       /**
        * Perform the given callback operation on all matching methods of the given
        * class and superclasses (or given interface and super-interfaces).
        * <p>The same named method occurring on subclass and superclass will appear
        * twice, unless excluded by the specified {@link MethodFilter}.
        * @param clazz class to start looking at
        * @param mc the callback to invoke for each method
        * @param mf the filter that determines the methods to apply the callback to
        */
       public static void doWithMethods(Class<?> clazz, MethodCallback mc, MethodFilter mf)
               throws IllegalArgumentException {
  
           // Keep backing up the inheritance hierarchy.
           Method[] methods = clazz.getDeclaredMethods();
           for (Method method : methods) {
               if (mf != null && !mf.matches(method)) {
                   continue;
               }
               try {
                   mc.doWith(method);
               }
               catch (IllegalAccessException ex) {
                   throw new IllegalStateException("Shouldn't be illegal to access method '" + method.getName()
                           + "': " + ex);
               }
           }
           if (clazz.getSuperclass() != null) {
               doWithMethods(clazz.getSuperclass(), mc, mf);
           }
           else if (clazz.isInterface()) {
               for (Class<?> superIfc : clazz.getInterfaces()) {
                   doWithMethods(superIfc, mc, mf);
               }
           }
       }
  
       
       /**
        * Perform the given callback operation on all matching methods of the given
        * class and superclasses (or given interface and super-interfaces).
        * <p>The same named method occurring on subclass and superclass will appear
        * twice, unless excluded by the specified {@link MethodFilter}.
        * @param clazz class to start looking at
        * @param mc the callback to invoke for each method
        * @param mf the filter that determines the methods to apply the callback to
        */
       public static void doWithMethodsWithNoRecursion(Class<?> clazz, MethodCallback mc, MethodFilter mf)
               throws IllegalArgumentException {
  
           // Keep backing up the inheritance hierarchy.
           Method[] methods = clazz.getDeclaredMethods();
           for (Method method : methods) {
               if (mf != null && !mf.matches(method)) {
                   continue;
               }
               try {
                   mc.doWith(method);
               }
               catch (IllegalAccessException ex) {
                   throw new IllegalStateException("Shouldn't be illegal to access method '" + method.getName()
                           + "': " + ex);
               }
           }
  //         if (clazz.getSuperclass() != null) {
  //             doWithMethods(clazz.getSuperclass(), mc, mf);
  //         }
  //         else if (clazz.isInterface()) {
  //             for (Class<?> superIfc : clazz.getInterfaces()) {
  //                 doWithMethods(superIfc, mc, mf);
  //             }
  //         }
       }
       /**
        * Get all declared methods on the leaf class and all superclasses. Leaf
        * class methods are included first.
        */
       public static Method[] getAllDeclaredMethods(Class<?> leafClass) throws IllegalArgumentException {
           final List<Method> methods = new ArrayList<Method>(32);
           doWithMethods(leafClass, new MethodCallback() {
               public void doWith(Method method) {
                   methods.add(method);
               }
           });
           return methods.toArray(new Method[methods.size()]);
       }
  
       /**
        * Invoke the given callback on all fields in the target class, going up the
        * class hierarchy to get all declared fields.
        * @param clazz the target class to analyze
        * @param fc the callback to invoke for each field
        */
       public static void doWithFields(Class<?> clazz, FieldCallback fc) throws IllegalArgumentException {
           doWithFields(clazz, fc, null);
       }
  
       /**
        * Invoke the given callback on all fields in the target class, going up the
        * class hierarchy to get all declared fields.
        * @param clazz the target class to analyze
        * @param fc the callback to invoke for each field
        * @param ff the filter that determines the fields to apply the callback to
        */
       public static void doWithFields(Class<?> clazz, FieldCallback fc, FieldFilter ff)
               throws IllegalArgumentException {
  
           // Keep backing up the inheritance hierarchy.
           Class<?> targetClass = clazz;
           do {
               Field[] fields = targetClass.getDeclaredFields();
               for (Field field : fields) {
                   // Skip static and final fields.
                   if (ff != null && !ff.matches(field)) {
                       continue;
                   }
                   try {
                       fc.doWith(field);
                   }
                   catch (IllegalAccessException ex) {
                       throw new IllegalStateException(
                               "Shouldn't be illegal to access field '" + field.getName() + "': " + ex);
                   }
               }
               targetClass = targetClass.getSuperclass();
           }
           while (targetClass != null && targetClass != Object.class);
       }
  
       /**
        * Given the source object and the destination, which must be the same class
        * or a subclass, copy all fields, including inherited fields. Designed to
        * work on objects with public no-arg constructors.
        * @throws IllegalArgumentException if the arguments are incompatible
        */
       public static void shallowCopyFieldState(final Object src, final Object dest) throws IllegalArgumentException {
           if (src == null) {
               throw new IllegalArgumentException("Source for field copy cannot be null");
           }
           if (dest == null) {
               throw new IllegalArgumentException("Destination for field copy cannot be null");
           }
           if (!src.getClass().isAssignableFrom(dest.getClass())) {
               throw new IllegalArgumentException("Destination class [" + dest.getClass().getName()
                       + "] must be same or subclass as source class [" + src.getClass().getName() + "]");
           }
           doWithFields(src.getClass(), new FieldCallback() {
               public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {
                   makeAccessible(field);
                   Object srcValue = field.get(src);
                   field.set(dest, srcValue);
               }
           }, COPYABLE_FIELDS);
       }
  
  
       /**
        * Action to take on each method.
        */
       public interface MethodCallback {
  
           /**
            * Perform an operation using the given method.
            * @param method the method to operate on
            */
           void doWith(Method method) throws IllegalArgumentException, IllegalAccessException;
       }
  
  
       /**
        * Callback optionally used to method fields to be operated on by a method callback.
        */
       public interface MethodFilter {
  
           /**
            * Determine whether the given method matches.
            * @param method the method to check
            */
           boolean matches(Method method);
       }
  
  
       /**
        * Callback interface invoked on each field in the hierarchy.
        */
       public interface FieldCallback {
  
           /**
            * Perform an operation using the given field.
            * @param field the field to operate on
            */
           void doWith(Field field) throws IllegalArgumentException, IllegalAccessException;
       }
  
  
       /**
        * Callback optionally used to filter fields to be operated on by a field callback.
        */
       public interface FieldFilter {
  
           /**
            * Determine whether the given field matches.
            * @param field the field to check
            */
           boolean matches(Field field);
       }
  
  
       /**
        * Pre-built FieldFilter that matches all non-static, non-final fields.
        */
       public static FieldFilter COPYABLE_FIELDS = new FieldFilter() {
  
           public boolean matches(Field field) {
               return !(Modifier.isStatic(field.getModifiers()) || Modifier.isFinal(field.getModifiers()));
           }
       };
  
  
       /**
        * Pre-built MethodFilter that matches all non-bridge methods.
        */
       public static MethodFilter NON_BRIDGED_METHODS = new MethodFilter() {
  
           public boolean matches(Method method) {
               return !method.isBridge();
           }
       };
  
  
       /**
        * Pre-built MethodFilter that matches all non-bridge methods
        * which are not declared on <code>java.lang.Object</code>.
        */
       public static MethodFilter USER_DECLARED_METHODS = new MethodFilter() {
  
           public boolean matches(Method method) {
               return (!method.isBridge() && method.getDeclaringClass() != Object.class);
           }
       };
  
   }
  