org.apache.openjpa.kernel.exps

Interface Path

All Superinterfaces:

Serializable, Value

All Known Implementing Classes:

CandidatePath, PCPath

public interface Path
extends Value

A path represents a traversal into fields of a candidate object. Equivalent paths should compare equal.

Author:

Abe White

Method Summary

Modifier and Type	Method and Description
void	get(FieldMetaData field, boolean nullTraversal) Traverse into the given field of the current object, and update the current object to that field value.
void	get(FieldMetaData fmd, XMLMetaData meta) Traverse into the given field that maps to xml column, and update the current object to that field value.
void	get(XMLMetaData meta, String name) Traverse into the gevin xpath name of the current object, and update the current object to that xpath field.
String	getCorrelationVar()
String	getSchemaAlias()
XMLMetaData	getXmlMapping() Return the current XPath's xmlmapping metadata.
FieldMetaData	last() Return the last field in the path, or null if the path does not not contain a final field.
void	setSchemaAlias(String schemaAlias) Set the schema alias (the identification variable) this path is begin with.
void	setSubqueryContext(Context context, String correlationVar)

Methods inherited from interface org.apache.openjpa.kernel.exps.Value

acceptVisit, getAlias, getMetaData, getName, getPath, getSelectAs, getType, isAggregate, isVariable, isXPath, setAlias, setImplicitType, setMetaData

Method Detail

get

void get(FieldMetaData field,
         boolean nullTraversal)

Traverse into the given field of the current object, and update the current object to that field value.

Parameters:

nullTraversal - if true, allow traversal through a null field

last

FieldMetaData last()

Return the last field in the path, or null if the path does not not contain a final field.

get

void get(FieldMetaData fmd,
         XMLMetaData meta)

Traverse into the given field that maps to xml column, and update the current object to that field value.

Parameters:

fmd - field maps to xml column

meta - associated xml mapping

get

void get(XMLMetaData meta,
         String name)

Traverse into the gevin xpath name of the current object, and update the current object to that xpath field.

getXmlMapping

XMLMetaData getXmlMapping()

Return the current XPath's xmlmapping metadata.

Returns:

Return xmlmapping

setSchemaAlias

void setSchemaAlias(String schemaAlias)

Set the schema alias (the identification variable) this path is begin with.

getSchemaAlias

String getSchemaAlias()

setSubqueryContext

void setSubqueryContext(Context context,
                        String correlationVar)

getCorrelationVar

String getCorrelationVar()