Module org.eclipse.persistence.jpa.jpql

Package org.eclipse.persistence.jpa.jpql.tools

Class EclipseLinkJPQLQueryHelper

java.lang.Object

org.eclipse.persistence.jpa.jpql.tools.AbstractJPQLQueryHelper

org.eclipse.persistence.jpa.jpql.tools.EclipseLinkJPQLQueryHelper

public class EclipseLinkJPQLQueryHelper
extends AbstractJPQLQueryHelper

This helper can perform the following operations over a JPQL query:

• Calculates the result type of a query: AbstractJPQLQueryHelper.getResultType();
• Calculates the type of an input parameter: AbstractJPQLQueryHelper.getParameterType(String).
• Calculates the possible choices to complete the query from a given position (used for content assist): AbstractJPQLQueryHelper.buildContentAssistProposals(int).
• Validates the query by introspecting it grammatically and semantically:
  • AbstractJPQLQueryHelper.validate(),
  • AbstractJPQLQueryHelper.validateGrammar(),
  • AbstractJPQLQueryHelper.validateSemantic().
• Refactoring support:
  • buildBasicRefactoringTool() provides support for generating the delta of the refactoring operation through a collection of TextEdit objects.
  • buildRefactoringTool() provides support for refactoring the JPQL query through the editable StateObject and once all refactoring operations have been executed, the IJPQLQueryFormatter will generate a new string representation of the JPQL query.

This helper should be used when the JPQL query is written using the JPQL grammar defined in the Java Persistence functional specification 2.1 and it contains the additional support provided by EclipseLink.

Provisional API: This interface is part of an interim API that is still under development and expected to change significantly before reaching stability. It is available at this early stage to solicit feedback from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken (repeatedly) as the API evolves.

Since:

2.4

Version:

2.5

Constructor Summary

Constructors

Constructor	Description
EclipseLinkJPQLQueryHelper(JPQLGrammar jpqlGrammar)	Creates a new EclipseLinkJPQLQueryHelper.
EclipseLinkJPQLQueryHelper(JPQLQueryContext queryContext)	Creates a new EclipseLinkJPQLQueryHelper.

Method Summary

Modifier and Type	Method	Description
BasicRefactoringTool	buildBasicRefactoringTool()	Creates the concrete instance of the tool that can refactor the content of a JPQL query.
protected AbstractContentAssistVisitor	buildContentAssistVisitor(JPQLQueryContext queryContext)	Creates the concrete instance of the content assist visitor that will give the possible choices based on the position of the cursor within the JPQL query.
protected EclipseLinkSemanticValidatorExtension	buildEclipseLinkSemanticValidatorExtension()	Creates a new EclipseLinkSemanticValidatorExtension, which will provide additional support for non-JPA related information.
protected EclipseLinkGrammarValidator	buildGrammarValidator(JPQLGrammar jpqlGrammar)	Creates the concrete instance of the validator that will grammatically validate the JPQL query.
protected JPQLQueryContext	buildJPQLQueryContext(JPQLGrammar jpqlGrammar)	Creates a context that will be used to store and retrieve information about the JPQL query.
protected IJPQLQueryBuilder	buildQueryBuilder()	Creates the right IJPQLQueryBuilder based on the JPQL grammar.
RefactoringTool	buildRefactoringTool()	Creates the concrete instance of the tool that can refactor the content of a JPQL query.
protected AbstractEclipseLinkSemanticValidator	buildSemanticValidator(JPQLQueryContext queryContext)	Creates the concrete instance of the validator that will semantically validate the JPQL query.

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.AbstractJPQLQueryHelper

buildContentAssistProposals, buildContentAssistProposals, buildNumericTypeComparator, dispose, getContentAssistVisitor, getGrammar, getGrammarValidator, getJPQLExpression, getParameterType, getParsedJPQLQuery, getProvider, getQuery, getQueryContext, getResultType, getSemanticValidator, getType, getTypeHelper, getTypeRepository, setJPQLExpression, setQuery, validate, validate, validateGrammar, validateGrammar, validateSemantic, validateSemantic

Methods inherited from class java.lang.Object

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

Constructor Details

EclipseLinkJPQLQueryHelper

public EclipseLinkJPQLQueryHelper(JPQLGrammar jpqlGrammar)

Creates a new EclipseLinkJPQLQueryHelper.

Parameters:

jpqlGrammar - The JPQLGrammar that will determine how to parse JPQL queries

EclipseLinkJPQLQueryHelper

public EclipseLinkJPQLQueryHelper(JPQLQueryContext queryContext)

Creates a new EclipseLinkJPQLQueryHelper.

Parameters:

queryContext - The context used to query information about the JPQL query

Method Details

buildBasicRefactoringTool

public BasicRefactoringTool buildBasicRefactoringTool()

Description copied from class: AbstractJPQLQueryHelper

Creates the concrete instance of the tool that can refactor the content of a JPQL query. This version simply provides the delta of the refactoring operations.

Specified by:

buildBasicRefactoringTool in class AbstractJPQLQueryHelper

Returns:

The concrete instance of RefactoringTool

See Also:

• AbstractJPQLQueryHelper.buildRefactoringTool()

buildContentAssistVisitor

protected AbstractContentAssistVisitor buildContentAssistVisitor(JPQLQueryContext queryContext)

Description copied from class: AbstractJPQLQueryHelper

Creates the concrete instance of the content assist visitor that will give the possible choices based on the position of the cursor within the JPQL query.

Specified by:

buildContentAssistVisitor in class AbstractJPQLQueryHelper

Parameters:

queryContext - The context used to query information about the JPQL query

Returns:

A new concrete instance of AbstractContentAssistVisitor

buildEclipseLinkSemanticValidatorExtension

protected EclipseLinkSemanticValidatorExtension buildEclipseLinkSemanticValidatorExtension()

Creates a new EclipseLinkSemanticValidatorExtension, which will provide additional support for non-JPA related information.

Returns:

Either a new concrete instance of EclipseLinkSemanticValidatorExtension or EclipseLinkSemanticValidatorExtension.NULL_EXTENSION if none is required

buildGrammarValidator

protected EclipseLinkGrammarValidator buildGrammarValidator(JPQLGrammar jpqlGrammar)

Description copied from class: AbstractJPQLQueryHelper

Creates the concrete instance of the validator that will grammatically validate the JPQL query.

Specified by:

buildGrammarValidator in class AbstractJPQLQueryHelper

Parameters:

jpqlGrammar - The context used to query information about the JPQL query

Returns:

A new concrete instance of AbstractGrammarValidator

buildJPQLQueryContext

protected JPQLQueryContext buildJPQLQueryContext(JPQLGrammar jpqlGrammar)

Description copied from class: AbstractJPQLQueryHelper

Creates a context that will be used to store and retrieve information about the JPQL query.

Specified by:

buildJPQLQueryContext in class AbstractJPQLQueryHelper

Parameters:

jpqlGrammar - The JPQL grammar that is required for dictating how the JPQL query will be parsed. It is also used by validation and by the content assist

Returns:

A new JPQLQueryContext

buildQueryBuilder

protected IJPQLQueryBuilder buildQueryBuilder()

Creates the right IJPQLQueryBuilder based on the JPQL grammar.

Returns:

A new concrete instance of IJPQLQueryBuilder

buildRefactoringTool

public RefactoringTool buildRefactoringTool()

Description copied from class: AbstractJPQLQueryHelper

Creates the concrete instance of the tool that can refactor the content of a JPQL query. This version provides a way to manipulate the editable version of the JPQL query (StateObject and simply outputs the result of the refactoring operations, i.e. the updated JPQL query).

Specified by:

buildRefactoringTool in class AbstractJPQLQueryHelper

Returns:

The concrete instance of RefactoringTool

See Also:

• AbstractJPQLQueryHelper.buildBasicRefactoringTool()

buildSemanticValidator

protected AbstractEclipseLinkSemanticValidator buildSemanticValidator(JPQLQueryContext queryContext)

Description copied from class: AbstractJPQLQueryHelper

Creates the concrete instance of the validator that will semantically validate the JPQL query.

Specified by:

buildSemanticValidator in class AbstractJPQLQueryHelper

Parameters:

queryContext - The context used to query information about the JPQL query

Returns:

A new concrete instance of AbstractSemanticValidator