Revision 23928 branches/v2_0_0_prep/libraries/libFMap_data/src/org/gvsig/fmap/data/feature/impl/FeatureIteratorFacade.java

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FeatureIteratorFacade.java
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import java.util.Iterator;
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import org.apache.log4j.Logger;


  		




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import org.gvsig.fmap.data.exceptions.ReadException;


  		




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import org.gvsig.fmap.data.feature.FeatureID;


  		




  
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import org.gvsig.fmap.data.exceptions.DataException;


  		




  
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import org.gvsig.fmap.data.feature.Feature;


  		




  
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import org.gvsig.fmap.data.feature.FeatureReference;


  		




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/**


  		




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 * Facade over a Iterator of FeatureIDs, to return Features instead.


  		




  
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 * Facade over a Iterator of FeatureReferences, to return Features instead.


  		




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 * 


  		




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 * @author <a href="mailto:cordin@disid.com">C?sar Ordi?ana</a>


  		




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 */


  		




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    static Logger logger = Logger.getLogger(FeatureIteratorFacade.class);


  		




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    private Iterator featureIDIterator;


  		




  
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    private Iterator refIterator;


  		




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    public FeatureIteratorFacade(Iterator featureIDIterator) {


  		




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        this.featureIDIterator = featureIDIterator;


  		




  
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    public FeatureIteratorFacade(Iterator refIterator) {


  		




  
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        this.refIterator = refIterator;


  		




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    }


  		




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    public boolean hasNext() {


  		




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        return featureIDIterator.hasNext();


  		




  
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        return refIterator.hasNext();


  		




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    }


  		




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    public Object next() {


  		




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        FeatureID featureID = nextFeatureID();


  		




  
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        FeatureReference ref = nextFeatureReference();


  		




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        try {


  		




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            return featureID.getFeature(null);


  		




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        } catch (ReadException ex) {


  		




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            logger.error("Error loading the Feature with FeatureID: "


  		




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                    + featureID, ex);


  		




  
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            return getFeature(ref);


  		




  
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        } catch (DataException ex) {


  		




  
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            logger.error("Error loading the Feature with FeatureReference: "


  		




  
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                    + ref, ex);


  		




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            return null;            


  		




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        }


  		




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    }


  		




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    /**


  		




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     * Returns the next FeatureID.


  		




  
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     * Returns the next FeatureReference.


  		




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     * 


  		




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     * @return the next FeatureID


  		




  
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     * @return the next FeatureReference


  		




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     */


  		




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    public FeatureID nextFeatureID() {


  		




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        return (FeatureID) featureIDIterator.next();


  		




  
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    public FeatureReference nextFeatureReference() {


  		




  
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        return (FeatureReference) refIterator.next();


  		




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    }


  		




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    public void remove() {


  		




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        featureIDIterator.remove();


  		




  
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        refIterator.remove();


  		




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    }


  		




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    /**


  		




  
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     * Returns a Feature for the FeatureReference.


  		




  
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     */


  		




  
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    protected Feature getFeature(FeatureReference ref) throws DataException {


  		




  
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        return ref.getFeature();


  		




  
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    }


  		




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}


  		












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