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World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.
/*
* Copyright (C) 2012 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind.ogc.collada;
/**
* Represents the COLLADA Instance element. An Instance is a pointer to an element in a COLLADA document. The Instance
* may target another element in the current COLLADA document, or an element in a remote document.
*
* @author pabercrombie
* @version $Id: ColladaAbstractInstance.java 600 2012-05-17 22:57:25Z pabercrombie $
*/
public abstract class ColladaAbstractInstance extends ColladaAbstractObject
{
/** Resolved target of the link. */
protected T instance;
/**
* Create an instance.
*
* @param ns Namespace.
*/
public ColladaAbstractInstance(String ns)
{
super(ns);
}
/**
* Indicates the URL of the target resource.
*
* @return URL field.
*/
public String getUrl()
{
return (String) this.getField("url");
}
/**
* Retrieves the target resource for this instance. Calling this method will cause the instance to resolve the
* linked resource. If the resource is external it may not be available immediately, in which case this method
* returns null.
*
* @return The linked resource, or null if the resource is not available.
*/
@SuppressWarnings("unchecked")
public T get()
{
if (this.instance == null)
{
Object o = this.getRoot().resolveReference(this.getUrl());
this.instance = (T) o; // May be null
}
return this.instance;
}
}