下面列出了org.apache.commons.lang.ArrayUtils#EMPTY_OBJECT_ARRAY 实例代码,或者点击链接到github查看源代码,也可以在右侧发表评论。
/**
* <p>Invoke a named method whose parameter type matches the object type.</p>
*
* <p>This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.</p>
*
* <p>This method supports calls to methods taking primitive parameters
* via passing in wrapping classes. So, for example, a <code>Boolean</code> object
* would match a <code>boolean</code> primitive.</p>
*
* @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);
}
/**
* <p>Invoke a method whose parameter types match exactly the parameter
* types given.</p>
*
* <p>This uses reflection to invoke the method obtained from a call to
* <code>getAccessibleMethod()</code>.</p>
*
* @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);
}
/**
* <p>Returns new instance of <code>klazz</code> created using constructor
* with signature <code>parameterTypes</code> and actual arguments
* <code>args</code>.</p>
*
* <p>The signatures should be assignment compatible.</p>
*
* @param cls the class to be constructed.
* @param args actual argument array
* @param parameterTypes parameter types array
* @return new instance of <code>klazz</code>
*
* @throws NoSuchMethodException if matching constructor cannot be found
* @throws IllegalAccessException thrown on the constructor's invocation
* @throws InvocationTargetException thrown on the constructor's invocation
* @throws InstantiationException thrown on the constructor's invocation
* @see Constructor#newInstance
*/
public static Object invokeConstructor(Class cls, Object[] args, Class[] parameterTypes)
throws NoSuchMethodException, IllegalAccessException, InvocationTargetException,
InstantiationException {
if (parameterTypes == null) {
parameterTypes = ArrayUtils.EMPTY_CLASS_ARRAY;
}
if (args == null) {
args = ArrayUtils.EMPTY_OBJECT_ARRAY;
}
Constructor ctor = getMatchingAccessibleConstructor(cls, parameterTypes);
if (null == ctor) {
throw new NoSuchMethodException("No such accessible constructor on object: "
+ cls.getName());
}
return ctor.newInstance(args);
}
/**
* <p>Returns new instance of <code>klazz</code> created using constructor
* with signature <code>parameterTypes</code> and actual arguments
* <code>args</code>.</p>
*
* <p>The signatures should match exactly.</p>
*
* @param cls the class to be constructed.
* @param args actual argument array
* @param parameterTypes parameter types array
* @return new instance of <code>klazz</code>
*
* @throws NoSuchMethodException if matching constructor cannot be found
* @throws IllegalAccessException thrown on the constructor's invocation
* @throws InvocationTargetException thrown on the constructor's invocation
* @throws InstantiationException thrown on the constructor's invocation
* @see Constructor#newInstance
*/
public static Object invokeExactConstructor(Class cls, Object[] args,
Class[] parameterTypes) throws NoSuchMethodException, IllegalAccessException,
InvocationTargetException, InstantiationException {
if (args == null) {
args = ArrayUtils.EMPTY_OBJECT_ARRAY;
}
if (parameterTypes == null) {
parameterTypes = ArrayUtils.EMPTY_CLASS_ARRAY;
}
Constructor ctor = getAccessibleConstructor(cls, parameterTypes);
if (null == ctor) {
throw new NoSuchMethodException("No such accessible constructor on object: "
+ cls.getName());
}
return ctor.newInstance(args);
}
/**
* <p>Invoke a static method whose parameter types match exactly the parameter
* types given.</p>
*
* <p>This uses reflection to invoke the method obtained from a call to
* {@link #getAccessibleMethod(Class, String, Class[])}.</p>
*
* @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);
}
/**
* <p>Invoke a named static method whose parameter type matches the object type.</p>
*
* <p>This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.</p>
*
* <p>This method supports calls to methods taking primitive parameters
* via passing in wrapping classes. So, for example, a <code>Boolean</code> class
* would match a <code>boolean</code> primitive.</p>
*
*
* @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);
}
/**
* <p>Returns new instance of <code>klazz</code> created using the actual
* arguments <code>args</code>. The formal parameter types are inferred from
* the actual values of <code>args</code>. See
* {@link #invokeExactConstructor(Class, Object[], Class[])} for more
* details.</p>
* <p>The signatures should be assignment compatible.</p>
*
* @param cls the class to be constructed.
* @param args actual argument array
* @return new instance of <code>klazz</code>
*
* @throws NoSuchMethodException If the constructor cannot be found
* @throws IllegalAccessException If an error occurs accessing the
* constructor
* @throws InvocationTargetException If an error occurs invoking the
* constructor
* @throws InstantiationException If an error occurs instantiating the class
*
* @see #invokeConstructor(java.lang.Class, java.lang.Object[],
* java.lang.Class[])
*/
public static Object invokeConstructor(Class cls, Object[] args)
throws NoSuchMethodException, IllegalAccessException, InvocationTargetException,
InstantiationException {
if (null == args) {
args = ArrayUtils.EMPTY_OBJECT_ARRAY;
}
Class parameterTypes[] = new Class[args.length];
for (int i = 0; i < args.length; i++) {
parameterTypes[i] = args[i].getClass();
}
return invokeConstructor(cls, args, parameterTypes);
}
/**
* <p>Returns new instance of <code>klazz</code> created using the actual
* arguments <code>args</code>. The formal parameter types are inferred from
* the actual values of <code>args</code>. See
* {@link #invokeExactConstructor(Class, Object[], Class[])} for more
* details.</p>
*
* <p>The signatures should match exactly.</p>
*
* @param cls the class to be constructed.
* @param args actual argument array
* @return new instance of <code>klazz</code>
*
* @throws NoSuchMethodException If the constructor cannot be found
* @throws IllegalAccessException If an error occurs accessing the
* constructor
* @throws InvocationTargetException If an error occurs invoking the
* constructor
* @throws InstantiationException If an error occurs instantiating the class
*
* @see #invokeExactConstructor(java.lang.Class, java.lang.Object[],
* java.lang.Class[])
*/
public static Object invokeExactConstructor(Class cls, Object[] args)
throws NoSuchMethodException, IllegalAccessException, InvocationTargetException,
InstantiationException {
if (null == args) {
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 invokeExactConstructor(cls, args, parameterTypes);
}
/**
* <p>Invoke a named method whose parameter type matches the object type.</p>
*
* <p>This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.</p>
*
* <p>This method supports calls to methods taking primitive parameters
* via passing in wrapping classes. So, for example, a <code>Boolean</code> object
* would match a <code>boolean</code> primitive.</p>
*
* <p> This is a convenient wrapper for
* {@link #invokeMethod(Object object,String methodName, Object[] args, Class[] parameterTypes)}.
* </p>
*
* @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);
}
/**
* <p>Invoke a method whose parameter types match exactly the object
* types.</p>
*
* <p> This uses reflection to invoke the method obtained from a call to
* <code>getAccessibleMethod()</code>.</p>
*
* @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);
}
/**
* <p>Invoke a named static method whose parameter type matches the object type.</p>
*
* <p>This method delegates the method search to {@link #getMatchingAccessibleMethod(Class, String, Class[])}.</p>
*
* <p>This method supports calls to methods taking primitive parameters
* via passing in wrapping classes. So, for example, a <code>Boolean</code> class
* would match a <code>boolean</code> primitive.</p>
*
* <p> This is a convenient wrapper for
* {@link #invokeStaticMethod(Class objectClass,String methodName,Object [] args,Class[] parameterTypes)}.
* </p>
*
* @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);
}
/**
* <p>Invoke a static method whose parameter types match exactly the object
* types.</p>
*
* <p> This uses reflection to invoke the method obtained from a call to
* {@link #getAccessibleMethod(Class, String, Class[])}.</p>
*
* @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);
}