impl/owl/CastingList.java

	CastingList.java revision 2
// The MIT License
//
// Copyright (c) 2004 Evren Sirin
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

/*
 * Created on Dec 21, 2004
 */
package impl.owl;


import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

import org.mindswap.owl.OWLIndividualList;
import org.mindswap.owl.OWLObject;

/**
 * @author Evren Sirin
 *
 */
public class CastingList extends OWLIndividualListImpl implements OWLIndividualList {
    private Class castTarget;

    public CastingList(Class castTarget) {
        super();

        this.castTarget = castTarget;
    }

    public CastingList(List list, Class castTarget) {
        super(list instanceof CastingList ? ((CastingList)list).getBaseList() : list);

        this.castTarget = castTarget;
    }

    public Object get(int index) {
        return ((OWLObject) super.get(index)).castTo(castTarget);
    }


    public Iterator iterator() {
        return listIterator(0);
    }

    public ListIterator listIterator() {
        return listIterator(0);
    }

    public ListIterator listIterator(final int index) {
        return new ListIterator() {
            ListIterator i = CastingList.this.getListIterator(index);

            public boolean hasNext()     {return i.hasNext();}
            public Object next()         {
                i.next();
                return get(i.previousIndex());
            }
            public boolean hasPrevious() {return i.hasPrevious();}
            public Object previous()     {
                i.previous();
                return get(i.nextIndex());
            }
            public int nextIndex()       {return i.nextIndex();}
            public int previousIndex()   {return i.previousIndex();}
            public void remove() { i.remove(); }
            public void set(Object o) { i.set(o); }
            public void add(Object o) { i.add(o); }
            };
    }

    private ListIterator getListIterator(int index) {
        return super.listIterator( index );
    }

    public Object[] toArray() {
        int size = size();
        Object[] result = new Object[size];

        for(int i = 0; i < size; i++)
            result[i] = get(i);

        return result;
    }

    public Object[] toArray(Object a[]) {
        int size = size();
        if (a.length < size)
            a = (Object[])java.lang.reflect.Array.newInstance(
                                a.getClass().getComponentType(), size);

        for(int i = 0; i < size; i++)
            a[i] = get(i);

        if (a.length > size)
            a[size] = null;

        return a;
    }
}