Revision 44669 trunk/org.gvsig.desktop/org.gvsig.desktop.compat.cdc/org.gvsig.fmap.dal/org.gvsig.fmap.dal.api/src/main/java/org/gvsig/fmap/dal/feature/FeatureAttributeDescriptor.java
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*/ |
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package org.gvsig.fmap.dal.feature; |
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import java.math.MathContext; |
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import java.text.DateFormat; |
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import org.cresques.cts.IProjection; |
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import org.gvsig.fmap.geom.Geometry; |
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import org.gvsig.fmap.geom.type.GeometryType; |
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import org.gvsig.timesupport.Interval; |
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import org.gvsig.tools.dataTypes.Coercion; |
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import org.gvsig.tools.dynobject.DynField_v2; |
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import org.gvsig.tools.evaluator.Evaluator; |
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import org.gvsig.tools.util.LabeledValue; |
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import org.gvsig.tools.dataTypes.CoercionContext; |
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/** |
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* A feature attribute descriptor contains information about |
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public interface FeatureAttributeDescriptor |
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extends DynField_v2, LabeledValue<FeatureAttributeDescriptor> |
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{
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public static final int BYTE_MAX_PRECISION = 3; // max byte 255 |
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public static final int BYTE_DEFAULT_PRECISION = BYTE_MAX_PRECISION; |
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public static final int INT_MAX_PRECISION = 10; // max int 2147483647. |
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public static final int INT_DEFAULT_PRECISION = INT_MAX_PRECISION; |
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public static final int LONG_MAX_PRECISION = 19; // max long 9223372036854775807. |
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public static final int LONG_DEFAULT_PRECISION = LONG_MAX_PRECISION; |
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// IEEE 754 Single-precision floating-point |
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// https://en.m.wikipedia.org/wiki/Single-precision_floating-point_format |
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public static final int FLOAT_MAX_PRECISION = 8; // 24bits |
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public static final int FLOAT_DEFAULT_PRECISION = FLOAT_MAX_PRECISION; |
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public static final int FLOAT_DEFAULT_SCALE = 3; |
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// IEEE 754 Double-precision floating-point |
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// https://en.m.wikipedia.org/wiki/Double-precision_floating-point_format |
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public static final int DOUBLE_MAX_PRECISION = 16; // 54bits |
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public static final int DOUBLE_DEFAULT_PRECISION = DOUBLE_MAX_PRECISION; |
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public static final int DOUBLE_DEFAULT_SCALE = 8; |
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// La precision de un BigDecimal es la de un BigInteger, que esta |
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// en 2^500000000, vamos a dejarla en que es algo mas de 2^5000000, siendo |
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// consciente de que algunos proveedores no podran suportarla y la recortaran. |
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public static final int DECIMAL_MAX_PRECISION = 2000000; |
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public static final int DECIMAL_DEFAULT_PRECISION = 20; |
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public static final int DECIMAL_DEFAULT_SCALE = 3; |
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/** |
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* Returns a clone of this attribute descriptor |
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* |
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public int getSize(); |
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/** |
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* For attributes of type {@link DataTypes#DOUBLE} and {@link DataTypes#FLOAT}
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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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* For attributes of type {@link DataTypes#DECIMAL}, this returns the maximum
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* number of digits. |
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* For other types, this must always return zero. |
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* |
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* @return |
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*/ |
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public int getPrecision(); |
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/** |
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* For attributes of type {@link DataTypes#DECIMAL}, this returns the maximum
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* number of digits after the decimal point. |
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* For other types, this must always return zero. |
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* |
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* @return |
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*/ |
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public int getScale(); |
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/** |
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* For attributes of type {@link DataTypes#DECIMAL}, this returns the MathContext
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* associated to this. |
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* For other types return {@link MathContext#UNLIMITED}.
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* |
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* @return |
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*/ |
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public MathContext getMathContext(); |
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/** |
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* Return a CoercionContext for this attribute. |
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* |
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* @return the CoercionContext |
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*/ |
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public CoercionContext getCoercionContext(); |
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/** |
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* Return a Coercion to convert a value to the type of this attribute. |
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* |
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* @return the Coercion. |
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*/ |
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public Coercion getCoercion(); |
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/** |
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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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public DateFormat getDateFormat(); |
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/** |
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* Return the default value coerced to the data type of attribute. |
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* Return null if can't coerce. |
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* |
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* @return default value or null. |
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*/ |
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public Object getDefaultValueCoerced(); |
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/** |
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* Returns this attribute relative position within the {@link Feature}.
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* |
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