Revision 27234 branches/v2_0_0_prep/libraries/libFMap_dal/src/org/gvsig/fmap/dal/feature/paging/FeaturePagingHelperImpl.java
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import java.util.Iterator; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.*; |
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import org.gvsig.fmap.dal.feature.EditableFeature; |
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import org.gvsig.fmap.dal.feature.Feature; |
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import org.gvsig.fmap.dal.feature.FeatureQuery; |
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import org.gvsig.fmap.dal.feature.FeatureSet; |
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import org.gvsig.fmap.dal.feature.FeatureStore; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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* Helper class to access the values of a FeatureCollection by position. Handles |
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* pagination automatically to avoid filling the memory in case of big |
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* collections. |
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*
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* |
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* TODO: evaluate if its more convenient to read values in the background when |
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* the returned value is near the end of the page, instead of loading a page on |
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* demand. |
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*
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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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public class FeaturePagingHelperImpl implements FeaturePagingHelper {
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/** |
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* Constructs a FeaturePagingHelperImpl from data of a FeatureStore. |
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*
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* |
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* @param featureStore |
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* to extract data from |
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* @throws DataException |
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/** |
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* Constructs a FeaturePagingHelperImpl from data of a FeatureStore. |
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*
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* |
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* @param featureSet |
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* to extract data from |
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* @param pageSize |
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/** |
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* Constructs a FeaturePagingHelperImpl from data of a FeatureStore. |
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*
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* |
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* @param featureSet |
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* to extract data from |
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* @throws DataException |
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/** |
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* Constructs a FeaturePagingHelperImpl from data of a FeatureStore. |
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*
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* |
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* @param featureSet |
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* to extract data from |
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* @param pageSize |
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} |
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long positionForIndex = index |
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- (getCurrentPage() * (long) getMaxPageSize());
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- (getCurrentPage() * getMaxPageSize()); |
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return values[(int) positionForIndex]; |
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} |
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if (currentPage < (numPages - 1)) {
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currentPageSize = getMaxPageSize(); |
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} else {
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currentPageSize = (int) (getTotalSize() - (currentPage * (long) getMaxPageSize()));
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currentPageSize = (int) (getTotalSize() - (currentPage * getMaxPageSize())); |
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} |
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values = new Feature[currentPageSize]; |
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} |
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featureSet = getFeatureStore().getFeatureSet(query); |
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} |
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public void delete(Feature feature) throws DataException {
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if(featureSet == null){
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// FIXME change to RuntimeDalException |
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throw new IllegalStateException(); |
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} |
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featureSet.delete(feature); |
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reloadCurrentPage(); |
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} |
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public void insert(EditableFeature feature) throws DataException {
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if (featureSet == null) {
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// FIXME change to RuntimeDalException |
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throw new IllegalStateException(); |
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} |
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featureSet.insert(feature); |
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reloadCurrentPage(); |
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} |
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public void update(EditableFeature feature) throws DataException {
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if (featureSet == null) {
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// FIXME change to RuntimeDalException |
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throw new IllegalStateException(); |
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} |
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featureSet.update(feature); |
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reloadCurrentPage(); |
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} |
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public FeatureType getFeatureType() {
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return featureSet.getDefaultFeatureType(); |
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} |
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} |
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