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All,
Nathan Bubna wrote:
> On 4/10/07, Henning P. Schmiedehausen <[EMAIL PROTECTED]> wrote:
>> Actually, the primitive types are the problem. For Object arrays,
>> using asArray
>> is a piece of cake. However, for simple types, you can not cast to
>> Object [], so
>> Arrays.asArray is out of the question, but I tried this abomination:
>>
>> if (Object [].class.isAssignableFrom(klass))
>> {
>> return Arrays.asList((Object []) obj);
>> } else if (boolean [].class.isAssignableFrom(klass))
>> {
>> return Arrays.asList(ArrayUtils.toObject((boolean []) obj));
>> } else [... all primitives to short ...]
>> }
It might be easier to use java.lang.reflect.Array to access elements in
these arrays. I wrote a primitive array wrapper for an expression
evaluator that I wrote some years ago.
I'd be happy to attach this code to a Jira isssue in order to bless it
as something being given away freely (but I reserve the right to publish
it separately, since I will be releasing the evaluator sometime soon).
import java.lang.reflect.Array;
import java.util.AbstractCollection;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
/**
* A class that wraps a primitive array with a Collection interface.
*
* @author Chris Schultz
* @version $Revision: 1.2 $ $Date: 2006-04-14 19:40:41 $
*/
public class PrimitiveArrayWrapper
extends AbstractCollection
{
private Object _array;
public PrimitiveArrayWrapper(Object array)
{
_array = array;
}
public Iterator iterator()
{
return new ArrayIterator(_array);
}
public int size()
{
return Array.getLength(_array);
}
private static class ArrayIterator
implements Iterator
{
private Object _array;
private int _current;
private int _size;
public ArrayIterator(Object array)
{
_array = array;
_size = Array.getLength(_array);
_current = 0;
}
public boolean hasNext()
{
return _current < _size;
}
public Object next()
{
if(!this.hasNext())
throw new java.util.NoSuchElementException();
return Array.get(_array, _current++);
}
public void remove()
{
throw new UnsupportedOperationException();
}
}
}
> if you can get it to work, i'm definitely open to other
> implementations. my only concern is to enable this functionality (and
> more if possible).
If you need get() and set() capability (a la java.util.List), those
could easily be worked-in to the above class.
- -chris
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