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Java Source Code / Java Documentation » Library » Apache commons beanutils 1.8.0 BETA src » org.apache.commons.beanutils

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.apache.commons.beanutils .ConstructorUtils

ConstructorUtils

public class ConstructorUtils (Code)

Utility reflection methods focussed on constructors, modelled after MethodUtils .

Known Limitations

Accessing Public Constructors In A Default Access Superclass

There is an issue when invoking public constructors contained in a default access superclass. Reflection locates these constructors fine and correctly assigns them as public. However, an IllegalAccessException is thrown if the constructors is invoked.

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

author:
   Craig R. McClanahan
author:
   Ralph Schaer
author:
   Chris Audley
author:
   Rey Francois
author:
   Gregor Rayman
author:
   Jan Sorensen
author:
   Robert Burrell Donkin
author:
   Rodney Waldhoff
version:
   $Revision: 555824 $ $Date: 2007-07-13 01:27:15 +0100 (Fri, 13 Jul 2007) $

Method Summary
public static Constructor	getAccessibleConstructor(Class klass, Class parameterType) Returns a constructor with single argument.
public static Constructor	getAccessibleConstructor(Class klass, Class[] parameterTypes) Returns a constructor given a class and signature.
public static Constructor	getAccessibleConstructor(Constructor ctor) Returns accessible version of the given constructor. Parameters: ctor - prototype constructor object.
public static Object	invokeConstructor(Class klass, Object arg) Convenience method returning new instance of `klazz` using a single argument constructor.
public static Object	invokeConstructor(Class klass, Object[] args) Returns new instance of `klazz` created using the actual arguments `args`.
public static Object	invokeConstructor(Class klass, Object[] args, Class[] parameterTypes)
public static Object	invokeExactConstructor(Class klass, Object arg) Convenience method returning new instance of `klazz` using a single argument constructor.
public static Object	invokeExactConstructor(Class klass, Object[] args) Returns new instance of `klazz` created using the actual arguments `args`.
public static Object	invokeExactConstructor(Class klass, Object[] args, Class[] parameterTypes)

Method Detail

getAccessibleConstructor
public static Constructor getAccessibleConstructor(Class klass, Class parameterType)(Code)
	Returns a constructor with single argument. Parameters: klass - the class to be constructed Parameters: parameterType - The constructor parameter type null if matching accessible constructor can not be found. See Also: Class.getConstructor See Also: ConstructorUtils.getAccessibleConstructor(java.lang.reflect.Constructor)

getAccessibleConstructor
public static Constructor getAccessibleConstructor(Class klass, Class[] parameterTypes)(Code)
	Returns a constructor given a class and signature. Parameters: klass - the class to be constructed Parameters: parameterTypes - the parameter array null if matching accessible constructor can not be found See Also: Class.getConstructor See Also: ConstructorUtils.getAccessibleConstructor(java.lang.reflect.Constructor)

getAccessibleConstructor
public static Constructor getAccessibleConstructor(Constructor ctor)(Code)
	Returns accessible version of the given constructor. Parameters: ctor - prototype constructor object. `null` if accessible constructor can not be found. See Also: java.lang.SecurityManager

invokeConstructor

public static Object invokeConstructor(Class klass, Object arg) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException(Code)

Convenience method returning new instance of klazz using a single argument constructor. The formal parameter type is inferred from the actual values of arg. See ConstructorUtils.invokeExactConstructor(Class,Object[],Class[]) for more details.

The signatures should be assignment compatible.

Parameters:
  klass - the class to be constructed.
Parameters:
  arg - the actual argument new instance of klazz
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 Also:   ConstructorUtils.invokeConstructor(java.lang.Class,java.lang.Object[],java.lang.Class[])

invokeConstructor

public static Object invokeConstructor(Class klass, Object[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException(Code)

Returns new instance of klazz created using the actual arguments args. The formal parameter types are inferred from the actual values of args. See ConstructorUtils.invokeExactConstructor(Class,Object[],Class[]) for more details.

The signatures should be assignment compatible.

Parameters:
  klass - the class to be constructed.
Parameters:
  args - actual argument array new instance of klazz
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 Also:   ConstructorUtils.invokeConstructor(java.lang.Class,java.lang.Object[],java.lang.Class[])

invokeConstructor

public static Object invokeConstructor(Class klass, Object[] args, Class[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException(Code)

Returns new instance of klazz created using constructor with signature parameterTypes and actual arguments args.

The signatures should be assignment compatible.

Parameters:
  klass - the class to be constructed.
Parameters:
  args - actual argument array
Parameters:
  parameterTypes - parameter types array new instance of klazz
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 Also:   Constructor.newInstance

invokeExactConstructor

public static Object invokeExactConstructor(Class klass, Object arg) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException(Code)

The signatures should match exactly.

Parameters:
  klass - the class to be constructed.
Parameters:
  arg - the actual argument new instance of klazz
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 Also:   ConstructorUtils.invokeExactConstructor(java.lang.Class,java.lang.Object[],java.lang.Class[])

invokeExactConstructor

public static Object invokeExactConstructor(Class klass, Object[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException(Code)

The signatures should match exactly.

Parameters:
  klass - the class to be constructed.
Parameters:
  args - actual argument array new instance of klazz
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 Also:   ConstructorUtils.invokeExactConstructor(java.lang.Class,java.lang.Object[],java.lang.Class[])

invokeExactConstructor

public static Object invokeExactConstructor(Class klass, Object[] args, Class[] parameterTypes) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException(Code)

Returns new instance of klazz created using constructor with signature parameterTypes and actual arguments args.

The signatures should match exactly.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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