root / trunk / libraries / libDataSource / src / org / gvsig / data / vectorial / IFeatureAttributeDescriptor.java @ 19399
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package org.gvsig.data.vectorial; |
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import org.cresques.cts.IProjection; |
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public interface IFeatureAttributeDescriptor { |
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public static final String TYPE_BYTE = "BYTE"; |
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public static final String TYPE_BOOLEAN = "BOOLEAN"; |
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public static final String TYPE_INT = "INTEGER"; |
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public static final String TYPE_LONG = "LONG"; |
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public static final String TYPE_FLOAT = "FLOAT"; |
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public static final String TYPE_DOUBLE = "DOUBLE"; |
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public static final String TYPE_STRING = "STRING"; |
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public static final String TYPE_DATE = "DATE"; |
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public static final String TYPE_GEOMETRY = "GEOMETRY"; |
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public static final String TYPE_OBJECT = "OBJECT"; |
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public static final String TYPE_FEATURE = "FEATURE"; |
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/**
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* Returns the name of this attribute. This is the name that can be used to
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* retrieve the value of an attribute and usually maps to either an XML
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* element name or a column name in a relational database.
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*/
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String getName();
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/**
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* Returns a constant from {@link DataType}. The return value of this method
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* indicates how the return values of {@link #getSize}, {@link #getPrecision}, and
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* {@link #getObjectClass} should be interpreted. For attributes whose maximum
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* cardinality is greater than one, this should return the data type of
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* the individual elements of the collection.
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*/
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String getDataType();
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/**
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* Returns a number that indicates the size of a given attribute. See the documentation
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* for the various constants of {@link DataType} for how to interpret this value. As an
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* example, when the data type is {@link DataType#STRING STRING}, this value indicates
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* the maximum length of the string.
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*/
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int getSize();
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/**
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* For attributes of type {@link DataType#DECIMAL DECIMAL}, this returns the maximum number
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* of places after the decimal point. For other types, this must always return zero.
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*/
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int getPrecision();
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/**
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* For attributes of type {@link DataType#OBJECT OBJECT}, this returns the Java {@link Class}
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* object that class or interface that all values of this attribute can be cast to.
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*/
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Class getObjectClass();
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/**
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* Returns the minimum number of occurrences of this attribute on a given
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* feature. The vast majority of data sources and data consumers will only
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* function with this value being zero or one. If the minimum number of
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* occurrences is zero, this is equivalent, in SQL terms, to the attribute
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* being nillable.
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*/
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int getMinimumOccurrences();
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/**
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* Returns the maximum number of occurrences of this attribute on a given
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* feature. The vast majority of data sources and data consumers will only
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* function with this value being one. A value of {@link Integer#MAX_VALUE}
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* indicates that the maximum number of occurrences is unbounded.
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*/
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int getMaximumOccurrences();
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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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* the {@link Feature} among all feature types.
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*/
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boolean isPrimaryKey();
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public int ordinal(); |
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IProjection getSRS(); |
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int getGeometryType();
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Object getDefaultValue();
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} |