Package org.eclipse.persistence.queries

Interface JPAQueryBuilder

All Known Implementing Classes:

HermesParser

public interface JPAQueryBuilder

This interface defines the entry point for implementing a JPQL query parsing system in EclipseLink.

By default, EclipseLink uses HermesParser for parsing a query and converting it into a DatabaseQuery.

Third-parties can implement this interface and provide a different JPQL parsing system if required. The JPAQueryBuilder implementing class can be registered via a persistence unit property and the implementation class must have a public, zero-arg constructor.

Since:

2.2

Version:

2.4

Author:

John Bracken, Pascal Filion

Method Summary

Modifier and Type	Method	Description
DatabaseQuery	buildQuery(CharSequence jpqlQuery, AbstractSession session)	Creates a fully initialized DatabaseQuery by parsing the given JPQL query.
Expression	buildSelectionCriteria(String entityName, String selectionCriteria, AbstractSession session)	Creates a new Expression that represents the given selection criteria.
void	populateQuery(CharSequence jpqlQuery, DatabaseQuery query, AbstractSession session)	Populates the given DatabaseQuery by parsing the given JPQL query.
void	setValidationLevel(String level)	Allow the parser validation level to be set.

Method Detail

setValidationLevel

void setValidationLevel(String level)

Allow the parser validation level to be set.

Parameters:

level - The validation levels are defined in ParserValidationType

buildQuery

DatabaseQuery buildQuery(CharSequence jpqlQuery,
                         AbstractSession session)

Creates a fully initialized DatabaseQuery by parsing the given JPQL query.

Parameters:

jpqlQuery - A non-null string representation of the query to parse and to convert into a DatabaseQuery

session - The EclipseLink AbstractSession that this query will execute against

Returns:

The fully initialized DatabaseQuery

buildSelectionCriteria

Expression buildSelectionCriteria(String entityName,
                                  String selectionCriteria,
                                  AbstractSession session)

Creates a new Expression that represents the given selection criteria.

Parameters:

entityName - The name of the entity for which a criteria is created

selectionCriteria - The string representation of a conditional expression to parse

session - The EclipseLink AbstractSession that this query will execute against

Returns:

The fully initialized Expression

populateQuery

void populateQuery(CharSequence jpqlQuery,
                   DatabaseQuery query,
                   AbstractSession session)

Populates the given DatabaseQuery by parsing the given JPQL query.

Parameters:

jpqlQuery - A non-null string representation of the query to parse and to convert into a DatabaseQuery

query - The query to populate with the derived JPQL query

session - The EclipseLink AbstractSession that this query will execute against