gvsig-geoprocess / org.gvsig.sextante / trunk / org.gvsig.sextante.app / org.gvsig.sextante.app.extension / src / main / java / org / gvsig / geoprocess / core / gvFeatureIterator.java @ 172
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package org.gvsig.geoprocess.core; |
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import java.util.ArrayList; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.NoSuchElementException; |
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import com.vividsolutions.jts.geom.Geometry; |
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import es.unex.sextante.core.Sextante; |
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import es.unex.sextante.dataObjects.FeatureImpl; |
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import es.unex.sextante.dataObjects.IFeature; |
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import es.unex.sextante.dataObjects.IFeatureIterator; |
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import es.unex.sextante.dataObjects.vectorFilters.IVectorLayerFilter; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.Feature; |
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import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor; |
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import org.gvsig.fmap.dal.feature.FeatureSet; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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import org.gvsig.fmap.geom.operation.tojts.ToJTS; |
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import org.gvsig.fmap.mapcontext.layers.vectorial.FLyrVect; |
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import org.gvsig.tools.dispose.DisposableIterator; |
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public class gvFeatureIterator implements IFeatureIterator { |
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private final List<IVectorLayerFilter> m_Filters; |
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private boolean m_bIsNextConsumed; |
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private IFeature m_CurrentValue;
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private boolean m_bFinished; |
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private DisposableIterator m_FeatureIterator;
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public gvFeatureIterator(final FLyrVect layer, |
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final List<IVectorLayerFilter> filters) { |
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m_bIsNextConsumed = true;
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m_Filters = filters; |
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FeatureSet set = null;
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try {
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set = layer.getFeatureStore().getFeatureSet(); |
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m_FeatureIterator = set.fastIterator(); |
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} catch (final DataException e) { |
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if (m_FeatureIterator != null) { |
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m_FeatureIterator.dispose(); |
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} |
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if (set != null) { |
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set.dispose(); |
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} |
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} |
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} |
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public gvFeatureIterator() {
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m_Filters = null;
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} |
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private boolean accept(final IFeature value) { |
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for (final IVectorLayerFilter filter : m_Filters) { |
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if (!filter.accept(value, 0)) { |
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return false; |
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} |
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} |
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return true; |
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} |
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public boolean moveToNextValid() { |
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if (m_FeatureIterator == null) { |
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return false; |
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} |
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boolean bFound = false; |
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; |
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while (!bFound && m_FeatureIterator.hasNext()) {
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try {
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final Feature f = (Feature) m_FeatureIterator.next();
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final org.gvsig.fmap.geom.Geometry geometry =
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f.getDefaultGeometry(); |
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final Geometry geom =
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(Geometry) geometry.invokeOperation(ToJTS.CODE, null);
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final FeatureType type = f.getType();
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@SuppressWarnings("unchecked") |
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final Iterator<FeatureAttributeDescriptor> iter = |
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type.iterator(); |
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final ArrayList<Object> objects = new ArrayList<Object>(); |
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while (iter.hasNext()) {
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final FeatureAttributeDescriptor descriptor = iter.next();
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final String name = descriptor.getName(); |
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// Comment this as if the geometry field is in the middle of
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// the fields it will be problematic elsewhere
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if (!type.getDefaultGeometryAttributeName().equals(name)) {
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objects.add(f.get(name)); |
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} |
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} |
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final FeatureImpl feature =
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new FeatureImpl(geom, objects.toArray(new Object[0])); |
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if (accept(feature)) {
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bFound = true;
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m_CurrentValue = feature; |
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m_bIsNextConsumed = false;
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} |
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} catch (final Exception e) { |
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Sextante.addErrorToLog(e); |
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return false; |
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} |
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} |
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if (!bFound) {
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m_bFinished = true;
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} |
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return bFound;
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} |
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public IFeature next() {
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if (!m_bIsNextConsumed) {
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m_bIsNextConsumed = true;
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return m_CurrentValue;
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} |
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if (!m_bFinished) {
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if (moveToNextValid()) {
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m_bIsNextConsumed = true;
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return m_CurrentValue;
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} |
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} |
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throw new NoSuchElementException(); |
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} |
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public boolean hasNext() { |
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if (m_bFinished) {
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return false; |
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} |
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if (!m_bIsNextConsumed) {
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return true; |
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} |
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return moveToNextValid();
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} |
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public void close() { |
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} |
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} |