root / branches / v2_0_0_prep / libraries / libFMap_dal / src / org / gvsig / fmap / dal / feature / Feature.java @ 25481
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package org.gvsig.fmap.dal.feature; |
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import java.util.Date; |
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import java.util.List; |
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import org.gvsig.fmap.geom.Geometry; |
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import org.gvsig.fmap.geom.primitive.Envelope; |
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/**
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* <p>Represents the basic data unit of a tabular structure, equivalent
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* to a record in a data base table. In SIG domain, a Feature is a compound
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* data structure that may contain a geographic component. The conventional term
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* Feature comes from the term cartographic feature and both represent the same
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* concept.
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* </p>
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* <p>
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* A Feature may contain more than one geometry attribute. In the case there is not any geometry data,
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* the <code>getDefaultGeometry()</code> will return <code>null</code>.
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* </p>
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* <p>
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* Features are not editable as such. To edit a Feature you have to obtain an
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* editable instance <code>EditableFeature</code> using the method <code>getEditable()</code>.
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* Modify that editable instance and then apply the changes to the Feature. This
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* mechanism is to avoid ambiguity and loosing track on the Feature internal state.
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* </p>
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* <br>
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* <p>The Feature:
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* <ul>
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* <li>Has an unique identifier <code>FeatureReference</code>
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* to recognize our Feature from each other from the same data store</li>
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* <li>Has a <code>FeatureType</code> that describes the Feature characteristics (attributes,
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* data types, default geometry, validation rules).</li>
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* <li>Can obtain a copy of itself.</li>
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* <li>Can obtain its default geometry attribute and also a list with all the geometry attributes.</li>
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* <li>Can obtain its default Spatial Reference System and also a list with all the SRSs used in the geometry attributes.</li>
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* <li>Can obtain the envelope (extent) of the default geometry attribute.
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* <li>Can obtain the editable instance of the Feature.</li>
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* <li>Has a set of utility methods to read attributes when their type is known, by both index and name.</li>
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* </ul>
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* </p>
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*
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*/
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public interface Feature { |
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/**
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* Returns a unique identifier for this Feature in the associated store.
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*
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* @return
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* a unique FeatureReference in the associated store
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*/
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public FeatureReference getReference();
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/**
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* Returns the FeatureType that describes the structure of this Feature.
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*
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* @return
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* a FeatureType describing this Feature structure.
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*/
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public FeatureType getType();
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/**
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* Creates and returns a copy of this
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*
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* @return
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* a new instance of Feature which is equal to this
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*/
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public Feature getCopy();
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/** Mode that indicates the validation of all FeatureRules */
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static final int ALL = 0; |
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/** Mode that indicates the validation of the update FeatureRules */
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static final int UPDATE = 1; |
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/** Mode that indicates the validation of the finish editing FeatureRules */
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static final int FINISH_EDITING = 2; |
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/**
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* Validates this Feature by applying the <code>FeatureRules</code>
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* corresponding to the given mode.
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*
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* @param mode
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* one of the constants {ALL, UPDATE, FINISH_EDITING}
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*/
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public void validate(int mode); |
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/**
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* Returns the editable instance of this Feature.
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* EditableFeature offers methods for Feature editing.
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*
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* @return
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* EditableFeature of this
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*/
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public EditableFeature getEditable();
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/**
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* Returns the value of an attribute given its name.
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*
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* @param name
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* a string containing the name of the attribute
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* @return
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* value of the specified attribute
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*/
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public Object get(String name); |
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/**
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* Returns the value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public Object get(int index); |
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/**
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* Returns the int value of an attribute given its name.
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*
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* @param name
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* a string containing the name of the attribute
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* @return
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* value of the specified attribute
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*/
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public int getInt(String name); |
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/**
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* Returns the int value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public int getInt(int index); |
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/**
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* Returns the Boolean value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public boolean getBoolean(String name); |
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/**
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* Returns the Boolean value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public boolean getBoolean(int index); |
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/**
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* Returns the long value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public long getLong(String name); |
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/**
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* Returns the long value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public long getLong(int index); |
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/**
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* Returns the float value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public float getFloat(String name); |
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/**
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* Returns the float value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public float getFloat(int index); |
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/**
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* Returns the double value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public double getDouble(String name); |
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/**
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* Returns the double value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public double getDouble(int index); |
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/**
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* Returns the Date value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public Date getDate(String name); |
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/**
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* Returns the Date value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public Date getDate(int index); |
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/**
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* Returns the String value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public String getString(String name); |
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/**
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* Returns the String value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public String getString(int index); |
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/**
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* Returns the byte value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public byte getByte(String name); |
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/**
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* Returns the byte value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public byte getByte(int index); |
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/**
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* Returns the Geometry value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public Geometry getGeometry(String name); |
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/**
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* Returns the Geometry value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public Geometry getGeometry(int index); |
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/**
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* Returns the array value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public Object[] getArray(String name); |
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/**
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* Returns the array value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public Object[] getArray(int index); |
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/**
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* Returns the Feature value of an attribute given its name.
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*
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* @param name
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* name of the attribute
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* @return
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* value of the specified attribute
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*/
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public Feature getFeature(String name); |
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/**
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* Returns the Feature value of an attribute given its position.
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*
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* @param index
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* position of the attribute
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* @return
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* value of the specified attribute
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*/
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public Feature getFeature(int index); |
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/**
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* Envelope (AKA extent or bounding box) of the default
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* geometry attribute.
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*
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* @return Envelope
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* of the default geometry attribute
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*/
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public Envelope getDefaultEnvelope();
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/**
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* Returns the value of the default geometry attribute,
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* which is a {@link Geometry}.
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*
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* @return
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* value of the default geometry attribute
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*/
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public Geometry getDefaultGeometry();
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/**
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* Returns a list with the values of this Feature's
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* geometry attributes.
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*
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* @return
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* a list with the values of this Feature's geometry attributes
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*/
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public List getGeometries(); |
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/**
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* Returns the Spatial Reference System in which is
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* expressed the default geometry attribute.
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*
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* @return
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* A string containing the default geometry attribute SRS.
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*/
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public String getDefaultSRS(); |
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/**
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* Returns a list with the Spatial Reference Systems in which
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* are expressed this Feature's geometry attributes.
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*
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* @return
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* a list with the Spatial Reference Systems.
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*/
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public List getSRSs(); |
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} |