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package org.gvsig.fmap.dal.feature.impl;
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import java.util.Arrays;
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import org.gvsig.fmap.dal.DataTypes;
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import org.gvsig.fmap.dal.exception.DataException;
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import org.gvsig.fmap.dal.feature.AbstractFeatureStoreTransform;
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import org.gvsig.fmap.dal.feature.EditableFeatureType;
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import org.gvsig.fmap.dal.feature.Feature;
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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.gvsig.fmap.geom.Geometry;
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import org.gvsig.fmap.geom.GeometryFactory;
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import org.gvsig.fmap.geom.GeometryManager;
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/**
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*
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* This transform adds a new attribute of type Geometry to the
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* original store's default FeatureType. When applying the transform
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* to a single feature this new attribute is assigned the value of a
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* point whose coordinates proceed from two numeric attributes from the
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* store, called xname, yname.
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*
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* This transform adds a new attribute of type Geometry to the original store's
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* default FeatureType. When applying the transform to a single feature this new
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* attribute is assigned the value of a point whose coordinates proceed from two
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* numeric attributes from the store, called xname, yname.
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*
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*/
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class MyTransform extends AbstractFeatureStoreTransform {
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private String geomName;
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private String xname;
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private String xname;
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private String yname;
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/**
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* Empty default constructor
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*/
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public MyTransform() {
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}
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/**
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* Initializes the transform by assigning the source store and the names of the necessary attributes.
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*
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* Initializes the transform by assigning the source store and the names of
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* the necessary attributes.
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*
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* @param store
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* source store.
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* source store.
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*
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* @param geomName
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* name of the geometry attribute in the default feature type from the source store.
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* name of the geometry attribute in the default feature type
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* from the source store.
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*
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* @param xname
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* name of the attribute containing the X coordinates
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* name of the attribute containing the X coordinates
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*
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* @param yname
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* name of the attribute containing the Y coordinates
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* name of the attribute containing the Y coordinates
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*
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* @throws DataException
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*/
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public void initialize(FeatureStore store, String geomName, String xname, String yname) throws DataException {
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// Initialize some data
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this.setFeatureStore(store);
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this.geomName = geomName;
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this.xname = xname;
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this.yname = yname;
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// obtain the feature type, add the new attribute and keep a reference to the resulting feature type
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EditableFeatureType type = store.getDefaultFeatureType().getEditable();
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type.add(geomName, DataTypes.GEOMETRY);
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setDefaultFeatureType(type.getNotEditableCopy());
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FeatureType[] types = new FeatureType[] { type.getNotEditableCopy() };
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setFeatureTypes(Arrays.asList(types), types[0]);
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}
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/**
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* Applies this transform to a target editable feature, using data from the
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* Applies this transform to a target editable feature, using data from the
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* source feature.
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*/
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public void applyTransform(Feature source, EditableFeature target)
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throws DataException {
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// copy source feature data over target feature
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target.copyFrom(source);
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// calculate and assign new attribute's value
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GeometryFactory geomFactory = GeometryManager.getInstance().getGeometryFactory();
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Geometry geom = geomFactory.createPoint2D(
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source.getDouble(xname),
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source.getDouble(xname),
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source.getDouble(yname)
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);
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target.setGeometry(this.geomName, geom);
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public void setState(PersistentState state) throws PersistenceException {
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}
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}
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