/**
	 * Removes the given descriptor, and the physical artifact corresponding
	 * to that descriptor. Returns <code>true</code> if and only if the
	 * descriptor existed in the repository, and was successfully removed.
	 */
	private boolean doRemoveArtifact(IArtifactDescriptor descriptor) {
		SimpleArtifactDescriptor simple = null;
		if (descriptor instanceof SimpleArtifactDescriptor)
			simple = (SimpleArtifactDescriptor) descriptor;
		else
			simple = createInternalDescriptor(descriptor);
		if (simple.getRepositoryProperty(SimpleArtifactDescriptor.ARTIFACT_REFERENCE) == null) {
			File file = getArtifactFile(descriptor);
			if (file != null) {
				// If the file != null remove it, otherwise just remove
				// the descriptor
				delete(file);
				if (file.exists())
					return false;
			}
		}
		boolean result = artifactDescriptors.remove(descriptor);
		if (result)
			unmapDescriptor(descriptor);

		return result;
	}