Bug 79909 [JFace] Localized resource registries for JFace
Please provide improved JFace support for managing SWT resources, with the following properties: - A registry can allocate and deallocate SWT resources given a descriptor - Resources are reference-counted and shared, allowing different objects with equivalent descriptors to share resources. - Everything in the registry can be deallocated with one function call - The registry should support an open-ended set of resources (and should initially support, at minimum, Images, Fonts, Colors) - It should be possible to create a "local registry" that behaves like a regular registry but actually shares its resources with a global registry. For example, the workbench could offer a local registry as a service to views and editors. This would allow views and editors to safely allocate and deallocate SWT resources without any chance of leaking.
bundles/org.eclipse.jface/src/org/eclipse/jface/resource/ImageRegistry.java
putEntry(key, entry);
        }
        if (entry.image == null && entry.descriptor == null) {
            entry.image = image;
            return;
        }
        throw new IllegalArgumentException(
                "ImageRegistry key already in use: " + key); 
    }
    /**
     * Removes an image from this registry.  
     * If an SWT image was allocated, it is disposed.
     * This method has no effect if there is no image or descriptor for the given key.
     * @param key the key
     */
    public void remove(String key) {
        if (table == null)
            return;
        Entry entry = (Entry) getTable().remove(key);
        if (entry != null) {
            if (entry.image != null && !entry.image.isDisposed()) {
                entry.image.dispose();
            }
            entry.image = null;
        }
    }
    /**
     * Contains the data for an entry in the registry. 
     */
    private static class Entry {