/*
 * Copyright (c) 2010, Michael Grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
package org.jowidgets.spi.impl.image;

import org.jowidgets.common.image.IImageDescriptor;
import org.jowidgets.common.image.IImageHandle;
import org.jowidgets.util.Assert;

public class ImageHandle<IMAGE_TYPE> implements IImageHandle {

    private final IImageFactory<IMAGE_TYPE> imageFactory;
    private final IImageDescriptor imageDescriptor;

    private boolean disposed;

    private IMAGE_TYPE image;

    public ImageHandle(final IMAGE_TYPE image) {
        this(new IImageFactory<IMAGE_TYPE>() {
            @Override
            public IMAGE_TYPE createImage() {
                return image;
            }
        }, null);
    }

    public ImageHandle(final IImageFactory<IMAGE_TYPE> imageFactory) {
        this(imageFactory, null);
    }

    public ImageHandle(final IImageFactory<IMAGE_TYPE> imageFactory, final IImageDescriptor imageDescriptor) {
        Assert.paramNotNull(imageFactory, "imageFactory");
        this.imageFactory = imageFactory;
        this.imageDescriptor = imageDescriptor;

        this.disposed = false;
    }

    @Override
    public final synchronized IMAGE_TYPE getImage() {
        checkDisposed();
        if (image == null) {
            image = imageFactory.createImage();
        }
        return image;
    }

    @Override
    public final IImageDescriptor getImageDescriptor() {
        checkDisposed();
        return imageDescriptor;
    }

    @Override
    public final synchronized boolean isInitialized() {
        return !isDisposed() && image != null;
    }

    public final synchronized boolean isDisposed() {
        return disposed;
    }

    public synchronized void dispose() {
        checkDisposed();
        disposed = true;
        image = null;
    }

    private void checkDisposed() {
        if (disposed) {
            throw new IllegalStateException("Image handle is disposed");
        }
    }

    @Override
    public String toString() {
        return "ImageHandle [imageDescriptor=" + imageDescriptor + ", disposed=" + disposed + ", image=" + image + "]";
    }

}