org.datanucleus.store.mapped.mapping
Class NullMapping

java.lang.Object
  org.datanucleus.store.mapped.mapping.JavaTypeMapping
      org.datanucleus.store.mapped.mapping.SingleFieldMapping
          org.datanucleus.store.mapped.mapping.NullMapping

public class NullMapping
extends SingleFieldMapping

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

Field Summary

Fields inherited from class org.datanucleus.store.mapped.mapping.JavaTypeMapping

absFieldNumber, datastoreContainer, datastoreMappings, LOCALISER, mmd, referenceMapping, roleForMember, storeMgr, type

Constructor Summary

NullMapping(MappedStoreManager storeMgr)

Method Summary

Class	getJavaType() Accessor for the java type being mapped.
Object	getObject(ExecutionContext ec, Object resultSet, int[] exprIndex) Obtains a value from datastoreResults at position specified by exprIndex.
void	setObject(ExecutionContext ec, Object preparedStatement, int[] exprIndex, Object value) Sets a value into datastoreStatement at position specified by exprIndex.

Methods inherited from class org.datanucleus.store.mapped.mapping.SingleFieldMapping

equals, getBoolean, getByte, getChar, getDefaultLength, getDouble, getFloat, getInt, getJavaTypeForDatastoreMapping, getLong, getShort, getString, getValidValues, initialize, prepareDatastoreMapping, setBoolean, setByte, setChar, setDouble, setFloat, setInt, setLong, setShort, setString

Methods inherited from class org.datanucleus.store.mapped.mapping.JavaTypeMapping

addDatastoreMapping, failureMessage, getAbsoluteFieldNumber, getColumnMetaDataForMember, getDatastoreContainer, getDatastoreMapping, getDatastoreMappings, getMemberMetaData, getNumberOfDatastoreMappings, getObject, getReferenceMapping, getRoleForMember, getStoreManager, getType, getValueForDatastoreMapping, hashCode, hasSimpleDatastoreRepresentation, includeInFetchStatement, includeInInsertStatement, includeInUpdateStatement, initialize, isNullable, isSerialised, representableAsStringLiteralInStatement, setAbsFieldNumber, setDatastoreContainer, setMemberMetaData, setObject, setReferenceMapping, setRoleForMember

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NullMapping

public NullMapping(MappedStoreManager storeMgr)

Method Detail

getJavaType

public Class getJavaType()

Description copied from class: JavaTypeMapping

Accessor for the java type being mapped. This is the java type that the mapping represents. Some examples :

• if the field is of type "MyClass" then the mapping will be OIDMapping (or subclass) the javaType will be OID, and the type will be MyClass.
• if the field is of type "int" then the mapping will be IntegerMapping, the javaType will be Integer, and the type will be int.

The "java type" is the java-type name used in the plugin.xml mapping file

Specified by:

getJavaType in class JavaTypeMapping

Returns:

The java type

getObject

public Object getObject(ExecutionContext ec,
                        Object resultSet,
                        int[] exprIndex)

Description copied from class: JavaTypeMapping

Obtains a value from datastoreResults at position specified by exprIndex.

Overrides:

getObject in class SingleFieldMapping

Parameters:

ec - ExecutionContext

resultSet - an object returned from the datastore with values

exprIndex - the position of the value in the result

Returns:

the value

setObject

public void setObject(ExecutionContext ec,
                      Object preparedStatement,
                      int[] exprIndex,
                      Object value)

Description copied from class: JavaTypeMapping

Sets a value into datastoreStatement at position specified by exprIndex.

Overrides:

setObject in class SingleFieldMapping

Parameters:

ec - ExecutionContext

preparedStatement - a datastore object that executes statements in the database

exprIndex - the position of the value in the statement

value - the value