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/*
 * 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
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package external.org.apache.commons.lang3.reflect;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

import external.org.apache.commons.lang3.ArrayUtils;
import external.org.apache.commons.lang3.ClassUtils;

/**
 * 

Utility reflection methods focused on methods, originally from Commons BeanUtils. * Differences from the BeanUtils version may be noted, especially where similar functionality * already existed within Lang. *

* *

Known Limitations

*

Accessing Public Methods In A Default Access Superclass

*

There is an issue when invoking public methods contained in a default access superclass on JREs prior to 1.4. * Reflection locates these methods fine and correctly assigns them as public. * However, an IllegalAccessException is thrown if the method is invoked.

* *

MethodUtils contains a workaround for this situation. * It will attempt to call setAccessible on this method. * If this call succeeds, then the method can be invoked as normal. * This call will only succeed when the application has sufficient security privileges. * If this call fails then the method may fail.

* * @since 2.5 * @version $Id: MethodUtils.java 1166253 2011-09-07 16:27:42Z ggregory $ */ public class MethodUtils { /** *

MethodUtils instances should NOT be constructed in standard programming. * Instead, the class should be used as * MethodUtils.getAccessibleMethod(method).

* *

This constructor is public to permit tools that require a JavaBean * instance to operate.

*/ public MethodUtils() { super(); } /** *

Invokes a named method whose parameter type matches the object type.

* *

This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.

* *

This method supports calls to methods taking primitive parameters * via passing in wrapping classes. So, for example, a Boolean object * would match a boolean primitive.

* *

This is a convenient wrapper for * {@link #invokeMethod(Object object,String methodName, Object[] args, Class[] parameterTypes)}. *

* * @param object invoke method on this object * @param methodName get method with this name * @param args use these arguments - treat null as empty array * @return The value returned by the invoked method * * @throws NoSuchMethodException if there is no such accessible method * @throws InvocationTargetException wraps an exception thrown by the method invoked * @throws IllegalAccessException if the requested method is not accessible via reflection */ public static Object invokeMethod(Object object, String methodName, Object... args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { if (args == null) { args = ArrayUtils.EMPTY_OBJECT_ARRAY; } int arguments = args.length; Class[] parameterTypes = new Class[arguments]; for (int i = 0; i < arguments; i++) { parameterTypes[i] = args[i].getClass(); } return invokeMethod(object, methodName, args, parameterTypes); } /** *

Invokes a named method whose parameter type matches the object type.

* *

This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.

* *

This method supports calls to methods taking primitive parameters * via passing in wrapping classes. So, for example, a Boolean object * would match a boolean primitive.

* * @param object invoke method on this object * @param methodName get method with this name * @param args use these arguments - treat null as empty array * @param parameterTypes match these parameters - treat null as empty array * @return The value returned by the invoked method * * @throws NoSuchMethodException if there is no such accessible method * @throws InvocationTargetException wraps an exception thrown by the method invoked * @throws IllegalAccessException if the requested method is not accessible via reflection */ public static Object invokeMethod(Object object, String methodName, Object[] args, Class[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { if (parameterTypes == null) { parameterTypes = ArrayUtils.EMPTY_CLASS_ARRAY; } if (args == null) { args = ArrayUtils.EMPTY_OBJECT_ARRAY; } Method method = getMatchingAccessibleMethod(object.getClass(), methodName, parameterTypes); if (method == null) { throw new NoSuchMethodException("No such accessible method: " + methodName + "() on object: " + object.getClass().getName()); } return method.invoke(object, args); } /** *

Invokes a method whose parameter types match exactly the object * types.

* *

This uses reflection to invoke the method obtained from a call to * getAccessibleMethod().

* * @param object invoke method on this object * @param methodName get method with this name * @param args use these arguments - treat null as empty array * @return The value returned by the invoked method * * @throws NoSuchMethodException if there is no such accessible method * @throws InvocationTargetException wraps an exception thrown by the * method invoked * @throws IllegalAccessException if the requested method is not accessible * via reflection */ public static Object invokeExactMethod(Object object, String methodName, Object... args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { if (args == null) { args = ArrayUtils.EMPTY_OBJECT_ARRAY; } int arguments = args.length; Class[] parameterTypes = new Class[arguments]; for (int i = 0; i < arguments; i++) { parameterTypes[i] = args[i].getClass(); } return invokeExactMethod(object, methodName, args, parameterTypes); } /** *

Invokes a method whose parameter types match exactly the parameter * types given.

* *

This uses reflection to invoke the method obtained from a call to * getAccessibleMethod().

* * @param object invoke method on this object * @param methodName get method with this name * @param args use these arguments - treat null as empty array * @param parameterTypes match these parameters - treat null as empty array * @return The value returned by the invoked method * * @throws NoSuchMethodException if there is no such accessible method * @throws InvocationTargetException wraps an exception thrown by the * method invoked * @throws IllegalAccessException if the requested method is not accessible * via reflection */ public static Object invokeExactMethod(Object object, String methodName, Object[] args, Class[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { if (args == null) { args = ArrayUtils.EMPTY_OBJECT_ARRAY; } if (parameterTypes == null) { parameterTypes = ArrayUtils.EMPTY_CLASS_ARRAY; } Method method = getAccessibleMethod(object.getClass(), methodName, parameterTypes); if (method == null) { throw new NoSuchMethodException("No such accessible method: " + methodName + "() on object: " + object.getClass().getName()); } return method.invoke(object, args); } /** *

Invokes a static method whose parameter types match exactly the parameter * types given.

* *

This uses reflection to invoke the method obtained from a call to * {@link #getAccessibleMethod(Class, String, Class[])}.

* * @param cls invoke static method on this class * @param methodName get method with this name * @param args use these arguments - treat null as empty array * @param parameterTypes match these parameters - treat null as empty array * @return The value returned by the invoked method * * @throws NoSuchMethodException if there is no such accessible method * @throws InvocationTargetException wraps an exception thrown by the * method invoked * @throws IllegalAccessException if the requested method is not accessible * via reflection */ public static Object invokeExactStaticMethod(Class cls, String methodName, Object[] args, Class[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { if (args == null) { args = ArrayUtils.EMPTY_OBJECT_ARRAY; } if (parameterTypes == null) { parameterTypes = ArrayUtils.EMPTY_CLASS_ARRAY; } Method method = getAccessibleMethod(cls, methodName, parameterTypes); if (method == null) { throw new NoSuchMethodException("No such accessible method: " + methodName + "() on class: " + cls.getName()); } return method.invoke(null, args); } /** *

Invokes a named static method whose parameter type matches the object type.

* *

This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.

* *

This method supports calls to methods taking primitive parameters * via passing in wrapping classes. So, for example, a Boolean class * would match a boolean primitive.

* *

This is a convenient wrapper for * {@link #invokeStaticMethod(Class objectClass,String methodName,Object [] args,Class[] parameterTypes)}. *

* * @param cls invoke static method on this class * @param methodName get method with this name * @param args use these arguments - treat null as empty array * @return The value returned by the invoked method * * @throws NoSuchMethodException if there is no such accessible method * @throws InvocationTargetException wraps an exception thrown by the * method invoked * @throws IllegalAccessException if the requested method is not accessible * via reflection */ public static Object invokeStaticMethod(Class cls, String methodName, Object... args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { if (args == null) { args = ArrayUtils.EMPTY_OBJECT_ARRAY; } int arguments = args.length; Class[] parameterTypes = new Class[arguments]; for (int i = 0; i < arguments; i++) { parameterTypes[i] = args[i].getClass(); } return invokeStaticMethod(cls, methodName, args, parameterTypes); } /** *

Invokes a named static method whose parameter type matches the object type.

* *

This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.

* *

This method supports calls to methods taking primitive parameters * via passing in wrapping classes. So, for example, a Boolean class * would match a boolean primitive.

* * * @param cls invoke static method on this class * @param methodName get method with this name * @param args use these arguments - treat null as empty array * @param parameterTypes match these parameters - treat null as empty array * @return The value returned by the invoked method * * @throws NoSuchMethodException if there is no such accessible method * @throws InvocationTargetException wraps an exception thrown by the * method invoked * @throws IllegalAccessException if the requested method is not accessible * via reflection */ public static Object invokeStaticMethod(Class cls, String methodName, Object[] args, Class[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { if (parameterTypes == null) { parameterTypes = ArrayUtils.EMPTY_CLASS_ARRAY; } if (args == null) { args = ArrayUtils.EMPTY_OBJECT_ARRAY; } Method method = getMatchingAccessibleMethod(cls, methodName, parameterTypes); if (method == null) { throw new NoSuchMethodException("No such accessible method: " + methodName + "() on class: " + cls.getName()); } return method.invoke(null, args); } /** *

Invokes a static method whose parameter types match exactly the object * types.

* *

This uses reflection to invoke the method obtained from a call to * {@link #getAccessibleMethod(Class, String, Class[])}.

* * @param cls invoke static method on this class * @param methodName get method with this name * @param args use these arguments - treat null as empty array * @return The value returned by the invoked method * * @throws NoSuchMethodException if there is no such accessible method * @throws InvocationTargetException wraps an exception thrown by the * method invoked * @throws IllegalAccessException if the requested method is not accessible * via reflection */ public static Object invokeExactStaticMethod(Class cls, String methodName, Object... args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { if (args == null) { args = ArrayUtils.EMPTY_OBJECT_ARRAY; } int arguments = args.length; Class[] parameterTypes = new Class[arguments]; for (int i = 0; i < arguments; i++) { parameterTypes[i] = args[i].getClass(); } return invokeExactStaticMethod(cls, methodName, args, parameterTypes); } /** *

Returns an accessible method (that is, one that can be invoked via * reflection) with given name and parameters. If no such method * can be found, return null. * This is just a convenient wrapper for * {@link #getAccessibleMethod(Method method)}.

* * @param cls get method from this class * @param methodName get method with this name * @param parameterTypes with these parameters types * @return The accessible method */ public static Method getAccessibleMethod(Class cls, String methodName, Class... parameterTypes) { try { return getAccessibleMethod(cls.getMethod(methodName, parameterTypes)); } catch (NoSuchMethodException e) { return null; } } /** *

Returns an accessible method (that is, one that can be invoked via * reflection) that implements the specified Method. If no such method * can be found, return null.

* * @param method The method that we wish to call * @return The accessible method */ public static Method getAccessibleMethod(Method method) { if (!MemberUtils.isAccessible(method)) { return null; } // If the declaring class is public, we are done Class cls = method.getDeclaringClass(); if (Modifier.isPublic(cls.getModifiers())) { return method; } String methodName = method.getName(); Class[] parameterTypes = method.getParameterTypes(); // Check the implemented interfaces and subinterfaces method = getAccessibleMethodFromInterfaceNest(cls, methodName, parameterTypes); // Check the superclass chain if (method == null) { method = getAccessibleMethodFromSuperclass(cls, methodName, parameterTypes); } return method; } /** *

Returns an accessible method (that is, one that can be invoked via * reflection) by scanning through the superclasses. If no such method * can be found, return null.

* * @param cls Class to be checked * @param methodName Method name of the method we wish to call * @param parameterTypes The parameter type signatures * @return the accessible method or null if not found */ private static Method getAccessibleMethodFromSuperclass(Class cls, String methodName, Class... parameterTypes) { Class parentClass = cls.getSuperclass(); while (parentClass != null) { if (Modifier.isPublic(parentClass.getModifiers())) { try { return parentClass.getMethod(methodName, parameterTypes); } catch (NoSuchMethodException e) { return null; } } parentClass = parentClass.getSuperclass(); } return null; } /** *

Returns an accessible method (that is, one that can be invoked via * reflection) that implements the specified method, by scanning through * all implemented interfaces and subinterfaces. If no such method * can be found, return null.

* *

There isn't any good reason why this method must be private. * It is because there doesn't seem any reason why other classes should * call this rather than the higher level methods.

* * @param cls Parent class for the interfaces to be checked * @param methodName Method name of the method we wish to call * @param parameterTypes The parameter type signatures * @return the accessible method or null if not found */ private static Method getAccessibleMethodFromInterfaceNest(Class cls, String methodName, Class... parameterTypes) { Method method = null; // Search up the superclass chain for (; cls != null; cls = cls.getSuperclass()) { // Check the implemented interfaces of the parent class Class[] interfaces = cls.getInterfaces(); for (int i = 0; i < interfaces.length; i++) { // Is this interface public? if (!Modifier.isPublic(interfaces[i].getModifiers())) { continue; } // Does the method exist on this interface? try { method = interfaces[i].getDeclaredMethod(methodName, parameterTypes); } catch (NoSuchMethodException e) { // NOPMD /* * Swallow, if no method is found after the loop then this * method returns null. */ } if (method != null) { break; } // Recursively check our parent interfaces method = getAccessibleMethodFromInterfaceNest(interfaces[i], methodName, parameterTypes); if (method != null) { break; } } } return method; } /** *

Finds an accessible method that matches the given name and has compatible parameters. * Compatible parameters mean that every method parameter is assignable from * the given parameters. * In other words, it finds a method with the given name * that will take the parameters given.

* *

This method is used by * {@link * #invokeMethod(Object object, String methodName, Object[] args, Class[] parameterTypes)}. * *

This method can match primitive parameter by passing in wrapper classes. * For example, a Boolean will match a primitive boolean * parameter. * * @param cls find method in this class * @param methodName find method with this name * @param parameterTypes find method with most compatible parameters * @return The accessible method */ public static Method getMatchingAccessibleMethod(Class cls, String methodName, Class... parameterTypes) { try { Method method = cls.getMethod(methodName, parameterTypes); MemberUtils.setAccessibleWorkaround(method); return method; } catch (NoSuchMethodException e) { // NOPMD - Swallow the exception } // search through all methods Method bestMatch = null; Method[] methods = cls.getMethods(); for (Method method : methods) { // compare name and parameters if (method.getName().equals(methodName) && ClassUtils.isAssignable(parameterTypes, method.getParameterTypes(), true)) { // get accessible version of method Method accessibleMethod = getAccessibleMethod(method); if (accessibleMethod != null && (bestMatch == null || MemberUtils.compareParameterTypes( accessibleMethod.getParameterTypes(), bestMatch.getParameterTypes(), parameterTypes) < 0)) { bestMatch = accessibleMethod; } } } if (bestMatch != null) { MemberUtils.setAccessibleWorkaround(bestMatch); } return bestMatch; } }





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