impl/owl/OWLObjectImpl.java

	OWLObjectImpl.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 12, 2004
 */
package impl.owl;

import org.mindswap.exceptions.ConversionException;
import org.mindswap.owl.OWLConfig;
import org.mindswap.owl.OWLObject;
import org.mindswap.owl.OWLObjectConverter;

/**
 * @author Evren Sirin
 */
public abstract class OWLObjectImpl implements OWLObject {
    private OWLObject next;

    public OWLObjectImpl() {
        next = this;
    }

    public OWLObject getNextView() {
        return next;
    }

    public void setNextView(OWLObject nextView) {
        next = nextView;
    }

    private void addView(OWLObject newView) {
        newView.setNextView(next);
        next = newView;
    }

    private OWLObject findView(Class javaClass) {
        OWLObject obj = this;
        do {
            if(javaClass.isInstance(obj))
                return obj;

            obj = obj.getNextView();
        } while(obj != this);

        return null;
    }

    public OWLObject castTo(Class javaClass) {
        OWLObject view = findView(javaClass);

        if(view == null) {
            OWLObjectConverter converter = OWLConfig.getConverter(javaClass);

            if(converter == null)
                throw new ConversionException("No converter found for " + javaClass);

            view = converter.cast(this);

            addView(view);
        }

        return view;
    }

    public boolean canCastTo(Class javaClass) {
        OWLObjectConverter converter = OWLConfig.getConverter(javaClass);

        return (converter != null && converter.canCast(this));
    }

    public String debugString() {
        return getImplementation().toString();
    }

    public boolean equals(Object object) {
        if(object instanceof OWLObjectImpl) {
            return getImplementation().equals(((OWLObjectImpl)object).getImplementation());
        }

        return false;
    }

    public int hashCode() {
        int hash = getImplementation().hashCode();
        return hash;
    }
}