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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
* limitations under the License.
*/
package com.feilong.lib.lang3.reflect;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Objects;
import com.feilong.lib.lang3.ArrayUtils;
import com.feilong.lib.lang3.ClassUtils;
import com.feilong.lib.lang3.Validate;
/**
*
* Utility reflection methods focused on {@link Method}s, 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 {@code public} methods contained in a default access superclass on JREs prior to 1.4.
* Reflection locates these methods fine and correctly assigns them as {@code public}.
* However, an {@link IllegalAccessException} is thrown if the method is invoked.
*
*
*
* {@link MethodUtils} contains a workaround for this situation.
* It will attempt to call {@link java.lang.reflect.AccessibleObject#setAccessible(boolean)} 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
*/
public class MethodUtils{
private static final Comparator METHOD_BY_SIGNATURE = (m1,m2) -> m1.toString().compareTo(m2.toString());
/**
*
* {@link MethodUtils} instances should NOT be constructed in standard programming.
* Instead, the class should be used as
* {@code MethodUtils.getAccessibleMethod(method)}.
*
*
*
* This constructor is {@code public} to permit tools that require a JavaBean
* instance to operate.
*
*/
public MethodUtils(){
super();
}
/**
*
* Invokes a named method without parameters.
*
*
*
* This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.
*
*
*
* 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
* @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
*
* @since 3.4
*/
public static Object invokeMethod(final Object object,final String methodName)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
return invokeMethod(object, methodName, ArrayUtils.EMPTY_OBJECT_ARRAY, null);
}
/**
*
* Invokes a named method without parameters.
*
*
*
* This is a convenient wrapper for
* {@link #invokeMethod(Object object, boolean forceAccess, String methodName, Object[] args, Class[] parameterTypes)}.
*
*
* @param object
* invoke method on this object
* @param forceAccess
* force access to invoke method even if it's not accessible
* @param methodName
* get method with this name
* @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
*
* @since 3.5
*/
public static Object invokeMethod(final Object object,final boolean forceAccess,final String methodName)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
return invokeMethod(object, forceAccess, methodName, ArrayUtils.EMPTY_OBJECT_ARRAY, null);
}
/**
*
* 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 {@code Boolean} object
* would match a {@code 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(final Object object,final String methodName,Object...args)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
args = ArrayUtils.nullToEmpty(args);
final Class[] parameterTypes = ClassUtils.toClass(args);
return invokeMethod(object, methodName, args, parameterTypes);
}
/**
*
* Invokes a named method whose parameter type matches the object type.
*
*
*
* This method supports calls to methods taking primitive parameters
* via passing in wrapping classes. So, for example, a {@code Boolean} object
* would match a {@code boolean} primitive.
*
*
*
* This is a convenient wrapper for
* {@link #invokeMethod(Object object, boolean forceAccess, String methodName, Object[] args, Class[] parameterTypes)}.
*
*
* @param object
* invoke method on this object
* @param forceAccess
* force access to invoke method even if it's not accessible
* @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
*
* @since 3.5
*/
public static Object invokeMethod(final Object object,final boolean forceAccess,final String methodName,Object...args)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
args = ArrayUtils.nullToEmpty(args);
final Class[] parameterTypes = ClassUtils.toClass(args);
return invokeMethod(object, forceAccess, methodName, args, parameterTypes);
}
/**
*
* Invokes a named method whose parameter type matches the object type.
*
*
*
* This method supports calls to methods taking primitive parameters
* via passing in wrapping classes. So, for example, a {@code Boolean} object
* would match a {@code boolean} primitive.
*
*
* @param object
* invoke method on this object
* @param forceAccess
* force access to invoke method even if it's not accessible
* @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
* @since 3.5
*/
public static Object invokeMethod(
final Object object,
final boolean forceAccess,
final String methodName,
Object[] args,
Class[] parameterTypes) throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
parameterTypes = ArrayUtils.nullToEmpty(parameterTypes);
args = ArrayUtils.nullToEmpty(args);
final String messagePrefix;
Method method = null;
if (forceAccess){
messagePrefix = "No such method: ";
method = getMatchingMethod(object.getClass(), methodName, parameterTypes);
if (method != null && !method.isAccessible()){
method.setAccessible(true);
}
}else{
messagePrefix = "No such accessible method: ";
method = getMatchingAccessibleMethod(object.getClass(), methodName, parameterTypes);
}
if (method == null){
throw new NoSuchMethodException(messagePrefix + methodName + "() on object: " + object.getClass().getName());
}
args = toVarArgs(method, args);
return method.invoke(object, args);
}
/**
*
* 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 {@code Boolean} object
* would match a {@code 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(final Object object,final String methodName,final Object[] args,final Class[] parameterTypes)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
return invokeMethod(object, false, methodName, args, parameterTypes);
}
/**
*
* Invokes a 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 object
* invoke method on this object
* @param methodName
* get method with this name
* @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
*
* @since 3.4
*/
public static Object invokeExactMethod(final Object object,final String methodName)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
return invokeExactMethod(object, methodName, ArrayUtils.EMPTY_OBJECT_ARRAY, null);
}
/**
*
* Invokes a method with no parameters.
*
*
*
* This uses reflection to invoke the method obtained from a call to
* {@link #getAccessibleMethod}(Class, String, Class[])}.
*
*
* @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(final Object object,final String methodName,Object...args)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
args = ArrayUtils.nullToEmpty(args);
final Class[] parameterTypes = ClassUtils.toClass(args);
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
* {@link #getAccessibleMethod(Class, String, Class[])}.
*
*
* @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 {@code 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(final Object object,final String methodName,Object[] args,Class[] parameterTypes)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
args = ArrayUtils.nullToEmpty(args);
parameterTypes = ArrayUtils.nullToEmpty(parameterTypes);
final 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 {@code 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 {@code null} as empty array
* @param parameterTypes
* match these parameters - treat {@code 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(final Class cls,final String methodName,Object[] args,Class[] parameterTypes)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
args = ArrayUtils.nullToEmpty(args);
parameterTypes = ArrayUtils.nullToEmpty(parameterTypes);
final 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 {@code 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 {@code Boolean} class
* would match a {@code boolean} primitive.
*
*
*
* This is a convenient wrapper for
* {@link #invokeStaticMethod(Class, String, Object[], Class[])}.
*
*
* @param cls
* invoke static method on this class
* @param methodName
* get method with this name
* @param args
* use these arguments - treat {@code 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(final Class cls,final String methodName,Object...args)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
args = ArrayUtils.nullToEmpty(args);
final Class[] parameterTypes = ClassUtils.toClass(args);
return invokeStaticMethod(cls, methodName, args, parameterTypes);
}
/**
*
* Invokes a named {@code 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 {@code Boolean} class
* would match a {@code boolean} primitive.
*
*
*
* @param cls
* invoke static method on this class
* @param methodName
* get method with this name
* @param args
* use these arguments - treat {@code null} as empty array
* @param parameterTypes
* match these parameters - treat {@code 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(final Class cls,final String methodName,Object[] args,Class[] parameterTypes)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
args = ArrayUtils.nullToEmpty(args);
parameterTypes = ArrayUtils.nullToEmpty(parameterTypes);
final Method method = getMatchingAccessibleMethod(cls, methodName, parameterTypes);
if (method == null){
throw new NoSuchMethodException("No such accessible method: " + methodName + "() on class: " + cls.getName());
}
args = toVarArgs(method, args);
return method.invoke(null, args);
}
private static Object[] toVarArgs(final Method method,Object[] args){
if (method.isVarArgs()){
final Class[] methodParameterTypes = method.getParameterTypes();
args = getVarArgs(args, methodParameterTypes);
}
return args;
}
/**
*
* Given an arguments array passed to a varargs method, return an array of arguments in the canonical form,
* i.e. an array with the declared number of parameters, and whose last parameter is an array of the varargs type.
*
*
* @param args
* the array of arguments passed to the varags method
* @param methodParameterTypes
* the declared array of method parameter types
* @return an array of the variadic arguments passed to the method
* @since 3.5
*/
static Object[] getVarArgs(final Object[] args,final Class[] methodParameterTypes){
if (args.length == methodParameterTypes.length && (args[args.length - 1] == null
|| args[args.length - 1].getClass().equals(methodParameterTypes[methodParameterTypes.length - 1]))){
// The args array is already in the canonical form for the method.
return args;
}
// Construct a new array matching the method's declared parameter types.
final Object[] newArgs = new Object[methodParameterTypes.length];
// Copy the normal (non-varargs) parameters
System.arraycopy(args, 0, newArgs, 0, methodParameterTypes.length - 1);
// Construct a new array for the variadic parameters
final Class varArgComponentType = methodParameterTypes[methodParameterTypes.length - 1].getComponentType();
final int varArgLength = args.length - methodParameterTypes.length + 1;
Object varArgsArray = Array.newInstance(ClassUtils.primitiveToWrapper(varArgComponentType), varArgLength);
// Copy the variadic arguments into the varargs array.
System.arraycopy(args, methodParameterTypes.length - 1, varArgsArray, 0, varArgLength);
if (varArgComponentType.isPrimitive()){
// unbox from wrapper type to primitive type
varArgsArray = ArrayUtils.toPrimitive(varArgsArray);
}
// Store the varargs array in the last position of the array to return
newArgs[methodParameterTypes.length - 1] = varArgsArray;
// Return the canonical varargs array.
return newArgs;
}
/**
*
* Invokes a {@code 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 {@code 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(final Class cls,final String methodName,Object...args)
throws NoSuchMethodException,IllegalAccessException,InvocationTargetException{
args = ArrayUtils.nullToEmpty(args);
final Class[] parameterTypes = ClassUtils.toClass(args);
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 {@code null}.
* This is just a convenience wrapper for
* {@link #getAccessibleMethod(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(final Class cls,final String methodName,final Class...parameterTypes){
try{
return getAccessibleMethod(cls.getMethod(methodName, parameterTypes));
}catch (final 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 {@code 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
final Class cls = method.getDeclaringClass();
if (Modifier.isPublic(cls.getModifiers())){
return method;
}
final String methodName = method.getName();
final 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 {@code 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 {@code null} if not found
*/
private static Method getAccessibleMethodFromSuperclass(final Class cls,final String methodName,final Class...parameterTypes){
Class parentClass = cls.getSuperclass();
while (parentClass != null){
if (Modifier.isPublic(parentClass.getModifiers())){
try{
return parentClass.getMethod(methodName, parameterTypes);
}catch (final 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 {@code null}.
*
*
*
* There isn't any good reason why this method must be {@code 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 {@code null} if not found
*/
private static Method getAccessibleMethodFromInterfaceNest(Class cls,final String methodName,final Class...parameterTypes){
// Search up the superclass chain
for (; cls != null; cls = cls.getSuperclass()){
// Check the implemented interfaces of the parent class
final Class[] interfaces = cls.getInterfaces();
for (final Class anInterface : interfaces){
// Is this interface public?
if (!Modifier.isPublic(anInterface.getModifiers())){
continue;
}
// Does the method exist on this interface?
try{
return anInterface.getDeclaredMethod(methodName, parameterTypes);
}catch (final NoSuchMethodException e){ // NOPMD
/*
* Swallow, if no method is found after the loop then this
* method returns null.
*/
}
// Recursively check our parent interfaces
final Method method = getAccessibleMethodFromInterfaceNest(anInterface, methodName, parameterTypes);
if (method != null){
return method;
}
}
}
return null;
}
/**
*
* 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 {@code Boolean} will match a primitive {@code 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(final Class cls,final String methodName,final Class...parameterTypes){
try{
final Method method = cls.getMethod(methodName, parameterTypes);
MemberUtils.setAccessibleWorkaround(method);
return method;
}catch (final NoSuchMethodException e){ // NOPMD - Swallow the exception
}
// search through all methods
final Method[] methods = cls.getMethods();
final List matchingMethods = new ArrayList<>();
for (final Method method : methods){
// compare name and parameters
if (method.getName().equals(methodName) && MemberUtils.isMatchingMethod(method, parameterTypes)){
matchingMethods.add(method);
}
}
// Sort methods by signature to force deterministic result
Collections.sort(matchingMethods, METHOD_BY_SIGNATURE);
Method bestMatch = null;
for (final Method method : matchingMethods){
// get accessible version of method
final Method accessibleMethod = getAccessibleMethod(method);
if (accessibleMethod != null
&& (bestMatch == null || MemberUtils.compareMethodFit(accessibleMethod, bestMatch, parameterTypes) < 0)){
bestMatch = accessibleMethod;
}
}
if (bestMatch != null){
MemberUtils.setAccessibleWorkaround(bestMatch);
}
if (bestMatch != null && bestMatch.isVarArgs() && bestMatch.getParameterTypes().length > 0 && parameterTypes.length > 0){
final Class[] methodParameterTypes = bestMatch.getParameterTypes();
final Class methodParameterComponentType = methodParameterTypes[methodParameterTypes.length - 1].getComponentType();
final String methodParameterComponentTypeName = ClassUtils.primitiveToWrapper(methodParameterComponentType).getName();
final Class lastParameterType = parameterTypes[parameterTypes.length - 1];
final String parameterTypeName = (lastParameterType == null) ? null : lastParameterType.getName();
final String parameterTypeSuperClassName = (lastParameterType == null) ? null : lastParameterType.getSuperclass().getName();
if (parameterTypeName != null && parameterTypeSuperClassName != null
&& !methodParameterComponentTypeName.equals(parameterTypeName)
&& !methodParameterComponentTypeName.equals(parameterTypeSuperClassName)){
return null;
}
}
return bestMatch;
}
/**
*
* Retrieves a method whether or not it's accessible. If no such method
* can be found, return {@code null}.
*
*
* @param cls
* The class that will be subjected to the method search
* @param methodName
* The method that we wish to call
* @param parameterTypes
* Argument class types
* @return The method
*
* @since 3.5
*/
public static Method getMatchingMethod(final Class cls,final String methodName,final Class...parameterTypes){
Validate.notNull(cls, "Null class not allowed.");
notEmpty(methodName, "Null or blank methodName not allowed.");
// Address methods in superclasses
Method[] methodArray = cls.getDeclaredMethods();
final List> superclassList = ClassUtils.getAllSuperclasses(cls);
for (final Class klass : superclassList){
methodArray = ArrayUtils.addAll(methodArray, klass.getDeclaredMethods());
}
Method inexactMatch = null;
for (final Method method : methodArray){
if (methodName.equals(method.getName()) && Objects.deepEquals(parameterTypes, method.getParameterTypes())){
return method;
}else if (methodName.equals(method.getName()) && ClassUtils.isAssignable(parameterTypes, method.getParameterTypes(), true)){
if (inexactMatch == null){
inexactMatch = method;
}else if (distance(parameterTypes, method.getParameterTypes()) < distance(
parameterTypes,
inexactMatch.getParameterTypes())){
inexactMatch = method;
}
}
}
return inexactMatch;
}
/**
*
* Validate that the specified argument character sequence is
* neither {@code null} nor a length of zero (no characters);
* otherwise throwing an exception with the specified message.
*
*
* Validate.notEmpty(myString, "The string must not be empty");
*
*
* @param
* the character sequence type
* @param chars
* the character sequence to check, validated not null by this method
* @param message
* the {@link String#format(String, Object...)} exception message if invalid, not null
* @param values
* the optional values for the formatted exception message, null array not recommended
* @return the validated character sequence (never {@code null} method for chaining)
* @throws NullPointerException
* if the character sequence is {@code null}
* @throws IllegalArgumentException
* if the character sequence is empty
*/
private static T notEmpty(final T chars,final String message,final Object...values){
Objects.requireNonNull(chars, () -> String.format(message, values));
if (chars.length() == 0){
throw new IllegalArgumentException(String.format(message, values));
}
return chars;
}
/**
*
* Returns the aggregate number of inheritance hops between assignable argument class types. Returns -1
* if the arguments aren't assignable. Fills a specific purpose for getMatchingMethod and is not generalized.
*
*
* @param classArray
* @param toClassArray
* @return the aggregate number of inheritance hops between assignable argument class types.
*/
private static int distance(final Class[] classArray,final Class[] toClassArray){
int answer = 0;
if (!ClassUtils.isAssignable(classArray, toClassArray, true)){
return -1;
}
for (int offset = 0; offset < classArray.length; offset++){
// Note InheritanceUtils.distance() uses different scoring system.
if (classArray[offset].equals(toClassArray[offset])){
continue;
}else if (ClassUtils.isAssignable(classArray[offset], toClassArray[offset], true)
&& !ClassUtils.isAssignable(classArray[offset], toClassArray[offset], false)){
answer++;
}else{
answer = answer + 2;
}
}
return answer;
}
/**
* Gets all class level public methods of the given class that are annotated with the given annotation.
*
* @param cls
* the {@link Class} to query
* @param annotationCls
* the {@link java.lang.annotation.Annotation} that must be present on a method to be matched
* @return an array of Methods (possibly empty).
* @throws IllegalArgumentException
* if the class or annotation are {@code null}
* @since 3.4
*/
public static Method[] getMethodsWithAnnotation(final Class cls,final Class annotationCls){
return getMethodsWithAnnotation(cls, annotationCls, false, false);
}
/**
* Gets all class level public methods of the given class that are annotated with the given annotation.
*
* @param cls
* the {@link Class} to query
* @param annotationCls
* the {@link Annotation} that must be present on a method to be matched
* @return a list of Methods (possibly empty).
* @throws IllegalArgumentException
* if the class or annotation are {@code null}
* @since 3.4
*/
public static List getMethodsListWithAnnotation(final Class cls,final Class annotationCls){
return getMethodsListWithAnnotation(cls, annotationCls, false, false);
}
/**
* Gets all methods of the given class that are annotated with the given annotation.
*
* @param cls
* the {@link Class} to query
* @param annotationCls
* the {@link java.lang.annotation.Annotation} that must be present on a method to be matched
* @param searchSupers
* determines if a lookup in the entire inheritance hierarchy of the given class should be performed
* @param ignoreAccess
* determines if non public methods should be considered
* @return an array of Methods (possibly empty).
* @throws IllegalArgumentException
* if the class or annotation are {@code null}
* @since 3.6
*/
public static Method[] getMethodsWithAnnotation(
final Class cls,
final Class annotationCls,
final boolean searchSupers,
final boolean ignoreAccess){
final List annotatedMethodsList = getMethodsListWithAnnotation(cls, annotationCls, searchSupers, ignoreAccess);
return annotatedMethodsList.toArray(ArrayUtils.EMPTY_METHOD_ARRAY);
}
/**
* Gets all methods of the given class that are annotated with the given annotation.
*
* @param cls
* the {@link Class} to query
* @param annotationCls
* the {@link Annotation} that must be present on a method to be matched
* @param searchSupers
* determines if a lookup in the entire inheritance hierarchy of the given class should be performed
* @param ignoreAccess
* determines if non public methods should be considered
* @return a list of Methods (possibly empty).
* @throws IllegalArgumentException
* if the class or annotation are {@code null}
* @since 3.6
*/
public static List getMethodsListWithAnnotation(
final Class cls,
final Class annotationCls,
final boolean searchSupers,
final boolean ignoreAccess){
Validate.notNull(cls, "The class must not be null");
Validate.isTrue(annotationCls != null, "The annotation class must not be null");
final List> classes = (searchSupers ? getAllSuperclassesAndInterfaces(cls) : new ArrayList<>());
classes.add(0, cls);
final List annotatedMethods = new ArrayList<>();
for (final Class acls : classes){
final Method[] methods = (ignoreAccess ? acls.getDeclaredMethods() : acls.getMethods());
for (final Method method : methods){
if (method.getAnnotation(annotationCls) != null){
annotatedMethods.add(method);
}
}
}
return annotatedMethods;
}
/**
*
* Gets the annotation object with the given annotation type that is present on the given method
* or optionally on any equivalent method in super classes and interfaces. Returns null if the annotation
* type was not present.
*
*
*
* Stops searching for an annotation once the first annotation of the specified type has been
* found. Additional annotations of the specified type will be silently ignored.
*
*
* @param
* the annotation type
* @param method
* the {@link Method} to query
* @param annotationCls
* the {@link Annotation} to check if is present on the method
* @param searchSupers
* determines if a lookup in the entire inheritance hierarchy of the given class is performed
* if the annotation was not directly present
* @param ignoreAccess
* determines if underlying method has to be accessible
* @return the first matching annotation, or {@code null} if not found
* @throws IllegalArgumentException
* if the method or annotation are {@code null}
* @since 3.6
*/
public static A getAnnotation(
final Method method,
final Class annotationCls,
final boolean searchSupers,
final boolean ignoreAccess){
Validate.notNull(method, "The method must not be null");
Validate.isTrue(annotationCls != null, "The annotation class must not be null");
if (!ignoreAccess && !MemberUtils.isAccessible(method)){
return null;
}
A annotation = method.getAnnotation(annotationCls);
if (annotation == null && searchSupers){
final Class mcls = method.getDeclaringClass();
final List> classes = getAllSuperclassesAndInterfaces(mcls);
for (final Class acls : classes){
final Method equivalentMethod = (ignoreAccess
? MethodUtils.getMatchingMethod(acls, method.getName(), method.getParameterTypes())
: MethodUtils.getMatchingAccessibleMethod(acls, method.getName(), method.getParameterTypes()));
if (equivalentMethod != null){
annotation = equivalentMethod.getAnnotation(annotationCls);
if (annotation != null){
break;
}
}
}
}
return annotation;
}
/**
*
* Gets a combination of {@link ClassUtils#getAllSuperclasses}(Class)} and
* {@link ClassUtils#getAllInterfaces}(Class)}, one from superclasses, one
* from interfaces, and so on in a breadth first way.
*
*
* @param cls
* the class to look up, may be {@code null}
* @return the combined {@code List} of superclasses and interfaces in order
* going up from this one
* {@code null} if null input
*/
private static List> getAllSuperclassesAndInterfaces(final Class cls){
if (cls == null){
return null;
}
final List> allSuperClassesAndInterfaces = new ArrayList<>();
final List> allSuperclasses = ClassUtils.getAllSuperclasses(cls);
int superClassIndex = 0;
final List> allInterfaces = ClassUtils.getAllInterfaces(cls);
int interfaceIndex = 0;
while (interfaceIndex < allInterfaces.size() || superClassIndex < allSuperclasses.size()){
Class acls;
if (interfaceIndex >= allInterfaces.size()){
acls = allSuperclasses.get(superClassIndex++);
}else if (superClassIndex >= allSuperclasses.size()){
acls = allInterfaces.get(interfaceIndex++);
}else if (interfaceIndex < superClassIndex){
acls = allInterfaces.get(interfaceIndex++);
}else if (superClassIndex < interfaceIndex){
acls = allSuperclasses.get(superClassIndex++);
}else{
acls = allInterfaces.get(interfaceIndex++);
}
allSuperClassesAndInterfaces.add(acls);
}
return allSuperClassesAndInterfaces;
}
}