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import java.text.DateFormat; |
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import org.gvsig.fmap.dal.DataTypes; |
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import org.gvsig.fmap.geom.Geometry; |
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import org.gvsig.tools.evaluator.Evaluator; |
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/** |
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* Describes a Feature attribute. |
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* A feature attribute descriptor contains information about |
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* one of the attributes in a feature, such as its name, data type |
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* or precision. |
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* |
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* |
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*/ |
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* {@link #getPrecision}, and {@link #getObjectClass} should be interpreted.
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* For attributes whose maximum cardinality is greater than one, this should |
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* return the data type of the individual elements of the collection. |
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* |
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* @return |
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* an <code>int</code> indicating the data type as defined in {@link DataTypes}.
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*/ |
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public int getDataType(); |
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public String getDataTypeName(); |
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/** |
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* Returns a number that indicates the size of a given attribute. See the |
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* documentation for the various constants of |
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* {@link FeatureAttributeDescriptor} for how to interpret this value. As an
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* example, when the data type is {@link FeatureAttributeDescriptor#STRING
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* STRING}, this value indicates the maximum length of the string. |
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* Returns a number that indicates the size of this attribute. See the |
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* documentation for the various constants of {@link DataTypes}
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* for how to interpret this value. As an example, when the data type is |
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* {@link DataTypes#STRING}, this value indicates the maximum length of the string.
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* |
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* @return |
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* an <code>int</code> indicating the size of the attribute. |
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*/ |
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public int getSize(); |
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/** |
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* For attributes of type {@link FeatureAttributeDescriptor#DECIMAL DECIMAL}
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* For attributes of type {@link DataTypes#DECIMAL}
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* , this returns the maximum number of places after the decimal point. For |
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* other types, this must always return zero. |
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*/ |
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public int getPrecision(); |
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/** |
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* For attributes of type {@link FeatureAttributeDescriptor#OBJECT OBJECT},
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* For attributes of type {@link DataTypes#OBJECT},
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* this returns the Java {@link Class} object that class or interface that
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* all values of this attribute can be cast to. |
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*/ |
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* Returns {@code true} if this attribute forms all or part of the unique identifying
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* value for the feature it is contained by. The primary key attributes uniquely |
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* identify this feature from other features of the same type. This is different |
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* from the {@linkplain Feature#getID feature's ID}, which must uniquely identify
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* from the {@linkplain Feature#getReference()}, which must uniquely identify
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* the {@link Feature} among all feature types.
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*/ |
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public boolean isPrimaryKey(); |
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