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From Martin van den Bemt <mll...@mvdb.net>
Subject Re: cvs commit: jakarta-commons/beanutils/src/java/org/apache/commons/beanutils ConstructorUtils.java
Date Mon, 03 Feb 2003 21:03:22 GMT
I don't consider myself a developer of beanutils when I apply a patch
from someone else ;)
But hey, rules are rules :)

Mvgr,
Martin

On Mon, 2003-02-03 at 22:02, robert burrell donkin wrote:
> hey martin!
> 
> since you're now a member of the beanutils team, you need to add your name 
> to the status file :)
> 
> - robert
> 
> On Monday, February 3, 2003, at 08:50 PM, mvdb@apache.org wrote:
> 
> > mvdb        2003/02/03 12:50:49
> >
> >   Modified:    beanutils/src/java/org/apache/commons/beanutils
> >                         ConstructorUtils.java
> >   Log:
> >   Applying patch supplied by dimiter at blue-edge dot bg
> >   In case you're interested here is a patch containing JavaDoc for the
> >   ConstructorUtils class.
> >   It's not perfect and I have borrowed some parts from the MethodUtils,
> >   but I hope it's better than nothing :).
> >
> >   Revision  Changes    Path
> >   1.3       +141 -2    jakarta-
> > commons/beanutils/src/java/org/apache/commons/beanutils/ConstructorUtils.
> > java
> >
> >   Index: ConstructorUtils.java
> >   ===================================================================
> >   RCS file: /home/cvs/jakarta-
> > commons/beanutils/src/java/org/apache/commons/beanutils/ConstructorUtils.
> > java,v
> >   retrieving revision 1.2
> >   retrieving revision 1.3
> >   diff -u -r1.2 -r1.3
> >   --- ConstructorUtils.java	15 Jan 2003 21:59:38 -0000	1.2
> >   +++ ConstructorUtils.java	3 Feb 2003 20:50:49 -0000	1.3
> >   @@ -63,6 +63,21 @@
> >
> >    /**
> >     * @version $Revision$ $Date$
> >   + *
> >   + * <p> Utility reflection methods focussed on constructors, modelled 
> > after {@link MethodUtils}. </p>
> >   + *
> >   + * <h3>Known Limitations</h3>
> >   + * <h4>Accessing Public Constructors In A Default Access 
> > Superclass</h4>
> >   + * <p>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 <code>IllegalAccessException</code> is thrown if the

> > constructors is invoked.</p>
> >   + *
> >   + * <p><code>ConstructorUtils</code> contains a workaround for
this 
> > situation.
> >   + * It will attempt to call <code>setAccessible</code> 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.</p>
> >   + *
> >     * @author Craig R. McClanahan
> >     * @author Ralph Schaer
> >     * @author Chris Audley
> >   @@ -82,6 +97,19 @@
> >
> >        // --------------------------------------------------------- 
> > Public Methods
> >
> >   +    /**
> >   +     * <p>Convenience method returning new instance of 
> > <code>klazz</code> using a single argument constructor.
> >   +     * The formal parameter type is inferred from the actual values of 
> > <code>arg</code>.
> >   +     * See {@link #invokeExactConstructor(Class, Object[], Class[])} 
> > for more details.</p>
> >   +     *
> >   +     * <p>The signatures should be assignment compatible.</p>
> >   +     *
> >   +     * @param klass the class to be constructed.
> >   +     * @param arg the actual argument
> >   +     * @return new instance of <code>klazz</code>
> >   +     *
> >   +     * @see #invokeConstructor(java.lang.Class, java.lang.Object[], 
> > java.lang.Class[])
> >   +     */
> >        public static Object invokeConstructor(Class klass, Object arg)
> >            throws
> >                NoSuchMethodException,
> >   @@ -94,6 +122,19 @@
> >
> >        }
> >
> >   +    /**
> >   +     * <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 klass the class to be constructed.
> >   +     * @param args actual argument array
> >   +     * @return new instance of <code>klazz</code>
> >   +     *
> >   +     * @see #invokeConstructor(java.lang.Class, java.lang.Object[], 
> > java.lang.Class[])
> >   +     */
> >        public static Object invokeConstructor(Class klass, Object[] args)
> >            throws
> >                NoSuchMethodException,
> >   @@ -113,6 +154,23 @@
> >
> >        }
> >
> >   +    /**
> >   +     * <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 klass 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 klass,
> >            Object[] args,
> >   @@ -139,6 +197,20 @@
> >            return ctor.newInstance(args);
> >        }
> >
> >   +
> >   +    /**
> >   +     * <p>Convenience method returning new instance of 
> > <code>klazz</code> using a single argument constructor.
> >   +     * The formal parameter type is inferred from the actual values of 
> > <code>arg</code>.
> >   +     * See {@link #invokeExactConstructor(Class, Object[], Class[])} 
> > for more details.</p>
> >   +     *
> >   +     * <p>The signatures should match exactly.</p>
> >   +     *
> >   +     * @param klass the class to be constructed.
> >   +     * @param arg the actual argument
> >   +     * @return new instance of <code>klazz</code>
> >   +     *
> >   +     * @see #invokeExactConstructor(java.lang.Class, java.lang.Object[
> > ], java.lang.Class[])
> >   +     */
> >        public static Object invokeExactConstructor(Class klass, Object 
> > arg)
> >            throws
> >                NoSuchMethodException,
> >   @@ -150,6 +222,20 @@
> >            return invokeExactConstructor(klass, 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 match exactly.</p>
> >   +     *
> >   +     * @param klass the class to be constructed.
> >   +     * @param args actual argument array
> >   +     * @return new instance of <code>klazz</code>
> >   +     *
> >   +     * @see #invokeExactConstructor(java.lang.Class, java.lang.Object[
> > ], java.lang.Class[])
> >   +     */
> >        public static Object invokeExactConstructor(Class klass, Object[] 
> > args)
> >            throws
> >                NoSuchMethodException,
> >   @@ -168,6 +254,24 @@
> >
> >        }
> >
> >   +    /**
> >   +     * <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 klass 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 klass,
> >            Object[] args,
> >   @@ -195,6 +299,13 @@
> >
> >        }
> >
> >   +    /**
> >   +     * Returns a constructor with single argument.
> >   +     * @param klass the class to be constructed
> >   +     * @return null if matching accessible constructor can not be 
> > found.
> >   +     * @see Class#getConstructor
> >   +     * @see #getAccessibleConstructor(java.lang.reflect.Constructor)
> >   +     */
> >        public static Constructor getAccessibleConstructor(
> >            Class klass,
> >            Class parameterType) {
> >   @@ -204,6 +315,14 @@
> >
> >        }
> >
> >   +    /**
> >   +     * Returns a constructor given a class and signature.
> >   +     * @param klass the class to be constructed
> >   +     * @param parameterTypes the parameter array
> >   +     * @return null if matching accessible constructor can not be found
> >   +     * @see Class#getConstructor
> >   +     * @see #getAccessibleConstructor(java.lang.reflect.Constructor)
> >   +     */
> >        public static Constructor getAccessibleConstructor(
> >            Class klass,
> >            Class[] parameterTypes) {
> >   @@ -217,6 +336,12 @@
> >
> >        }
> >
> >   +    /**
> >   +     * Returns accessible version of the given constructor.
> >   +     * @param ctor prototype constructor object.
> >   +     * @return <code>null</code> if accessible constructor can not
be 
> > found.
> >   +     * @see java.lang.SecurityManager
> >   +     */
> >        public static Constructor getAccessibleConstructor(Constructor 
> > ctor) {
> >
> >            // Make sure we have a method to check
> >   @@ -241,7 +366,21 @@
> >        }
> >
> >        // -------------------------------------------------------- 
> > Private Methods
> >   -
> >   +    /**
> >   +     * <p>Find an accessible constructor with compatible parameters.
> >   +     * Compatible parameters mean that every method parameter is 
> > assignable from
> >   +     * the given parameters. In other words, it finds constructor that 
> > will take
> >   +     * the parameters given.</p>
> >   +     *
> >   +     * <p>First it checks if there is constructor matching the exact 
> > signature.
> >   +     * If no such, all the constructors of the class are tested if 
> > their signatures
> >   +     * are assignment compatible with the parameter types.
> >   +     * The first matching constructor is returned.</p>
> >   +     *
> >   +     * @param clazz find constructor for this class
> >   +     * @param parameterTypes find method with compatible parameters
> >   +     * @return a valid Constructor object. If there's no matching 
> > constructor, returns <code>null</code>.
> >   +     */
> >        private static Constructor getMatchingAccessibleConstructor(
> >            Class clazz,
> >            Class[] parameterTypes) {
> >
> >
> >
> >
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