Revision 866 org.gvsig.proj/branches/refactor2018/org.gvsig.proj/org.gvsig.proj.swing/org.gvsig.proj.swing.impl/src/main/java/org/gvsig/proj/swing/impl/tree/GroupLoader.java

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GroupLoader.java
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package org.gvsig.proj.swing.impl.tree;
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import java.util.ArrayList;


  		




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import java.util.concurrent.ExecutionException;


  		




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import javax.swing.SwingWorker;


  		




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import javax.swing.tree.TreeNode;


  		




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import org.slf4j.Logger;


  		




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import org.slf4j.LoggerFactory;


  		




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public abstract class GroupLoader extends SwingWorker<ArrayList<TreeNode>, TreeNode> {


  		




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	private static Logger logger = LoggerFactory.getLogger(GroupLoader.class);


  		




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	protected AsyncLoadedGroup caller;


  		




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	public GroupLoader(AsyncLoadedGroup caller) {


  		




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		this.caller = caller;


  		




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	}


  		




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	@Override


  		




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	protected void done() {


  		




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		super.done();


  		




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		if (!isCancelled()) {


  		




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			try {


  		




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				ArrayList<TreeNode> result = get();


  		




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				this.caller.loaded(result, this);


  		




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			} catch (InterruptedException | ExecutionException e) {


  		




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				logger.debug(e.getMessage(), e);


  		




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			}


  		




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		}


  		




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		else {


  		




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			this.caller.cancelled(this);


  		




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		}


  		




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	}


  		




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}


  		




  
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/**


  		




  
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 * Loads the children of a loaded group


  		




  
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 *  


  		




  
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 * @author Cesar Martinez Izquierdo


  		




  
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 */


  		




  
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public interface GroupLoader {


  		




  
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	/**


  		




  
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	 * Start loading the children, which can happen immediately or


  		




  
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	 * be done asynchronously


  		




  
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	 */


  		




  
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	void execute();


  		




  
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	/**


  		




  
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	 * Attempts to cancel the loading process


  		




  
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	 * @return


  		




  
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	 */


  		




  
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	void cancel();


  		




  
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	/**


  		




  
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	 * Whether the loading process has been cancelled


  		




  
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	 * 


  		




  
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	 * @return


  		




  
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	 */


  		




  
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	boolean isCancelled();


  		




  
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	/**


  		




  
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	 * Creates an instance of a node to be displayed as temporary child


  		




  
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	 * while data is loading 


  		




  
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	 * 


  		




  
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	 * @return A TreeNode instance or null if no loading node is needed


  		




  
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	 */


  		




  
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	TreeNode createLoadingNode();


  		




  
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}


  		












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