org.jpox.store.mapping
Class NullMapping

java.lang.Object
  extended byorg.jpox.store.mapping.JavaTypeMapping
      extended byorg.jpox.store.mapping.SingleFieldMapping
          extended byorg.jpox.store.mapping.NullMapping

public class NullMapping
extends SingleFieldMapping

Simple mapping for a null literal. Only used when the type is not determined

Version:
$Revision: 1.3 $

Field Summary
 
Fields inherited from class org.jpox.store.mapping.SingleFieldMapping
datastoreContainer, typeInfo
 
Fields inherited from class org.jpox.store.mapping.JavaTypeMapping
datastoreMappings, dba, fmd, LOCALISER, referenceMapping, type
 
Constructor Summary
NullMapping(DatastoreAdapter dba)
           
 
Method Summary
 java.lang.Class getJavaType()
          Accessor for the java type being mapped
 java.lang.Object getObject(PersistenceManager pm, java.lang.Object resultSet, int[] exprIndex)
          Obtains a value from resultSet at position specified by exprIndex.
 java.lang.Object getSampleValue()
          Return a sample value of the mapping type to be used for internal evaluation of type and conversion.
 ScalarExpression newLiteral(QueryExpression qs, java.lang.Object value)
          Creates a literal from an value.
 ScalarExpression newScalarExpression(QueryExpression qs, LogicSetExpression te)
          Creates a expression from a field name/table.
 void setObject(PersistenceManager pm, java.lang.Object preparedStatement, int[] exprIndex, java.lang.Object value)
          Sets a value into preparedStatement at position specified by exprIndex.
 
Methods inherited from class org.jpox.store.mapping.SingleFieldMapping
equals, getBoolean, getByte, getChar, getDatastoreContainer, getDouble, getFloat, getInt, getLong, getShort, getString, hasValue, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, prepareDatastoreMapping, setBoolean, setByte, setChar, setDouble, setFloat, setInt, setLong, setShort, setString
 
Methods inherited from class org.jpox.store.mapping.JavaTypeMapping
addDataStoreMapping, failureMessage, getDataStoreMapping, getDataStoreMappings, getFieldMetaData, getNumberOfDatastoreFields, getObject, getReferenceMapping, getType, isNullable, setDefault, setObject, setReferenceMapping
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

NullMapping

public NullMapping(DatastoreAdapter dba)
Method Detail

getJavaType

public java.lang.Class getJavaType()
Description copied from class: JavaTypeMapping
Accessor for the java type being mapped

Specified by:
getJavaType in class JavaTypeMapping
Returns:
The java type

getSampleValue

public java.lang.Object getSampleValue()
Description copied from class: JavaTypeMapping
Return a sample value of the mapping type to be used for internal evaluation of type and conversion.

Specified by:
getSampleValue in class JavaTypeMapping
Returns:
The sample value.

getObject

public java.lang.Object getObject(PersistenceManager pm,
                                  java.lang.Object resultSet,
                                  int[] exprIndex)
Description copied from class: JavaTypeMapping
Obtains a value from resultSet at position specified by exprIndex.

Overrides:
getObject in class SingleFieldMapping

setObject

public void setObject(PersistenceManager pm,
                      java.lang.Object preparedStatement,
                      int[] exprIndex,
                      java.lang.Object value)
Description copied from class: JavaTypeMapping
Sets a value into preparedStatement at position specified by exprIndex.

Overrides:
setObject in class SingleFieldMapping

newLiteral

public ScalarExpression newLiteral(QueryExpression qs,
                                   java.lang.Object value)
Description copied from class: JavaTypeMapping
Creates a literal from an value. A string literal is enclosed in single quotes. for example: "literal". A string literal that includes a single quote is represented by two single quotes. for example: "literal''s". An exact numeric literal is a numeric value without a decimal point, such as 57, -957, +62. An approximate numeric literal is a numeric value in scientific notation, such as 7E3, -57.9E2, or a numeric value with a decimal, such as 7., -95.7, +6.2.

Specified by:
newLiteral in class JavaTypeMapping
Parameters:
qs - The Query statement
value - The object
Returns:
A Scalar Expression

newScalarExpression

public ScalarExpression newScalarExpression(QueryExpression qs,
                                            LogicSetExpression te)
Description copied from class: JavaTypeMapping
Creates a expression from a field name/table. e.g. tablename.fieldname; tablealias.fieldalias

Specified by:
newScalarExpression in class JavaTypeMapping
Parameters:
qs - The Query statement
te - the alias for the table
Returns:
A Scalar Expression


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