org.eclipse.persistence.jpa.jpql.tools

Class AbstractContentAssistVisitor.FromClauseCollectionHelper

java.lang.Object

org.eclipse.persistence.jpa.jpql.tools.AbstractContentAssistVisitor.FromClauseCollectionHelper

All Implemented Interfaces:

AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Direct Known Subclasses:

EclipseLinkContentAssistVisitor.FromClauseCollectionHelper

Enclosing class:

AbstractContentAssistVisitor

protected static class AbstractContentAssistVisitor.FromClauseCollectionHelper
extends java.lang.Object
implements AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FromClauseCollectionHelper(AbstractContentAssistVisitor visitor)

Method Summary

Modifier and Type	Method and Description
void	addAtTheEndOfChild(AbstractFromClause expression, CollectionExpression collectionExpression, int index, boolean hasComma, boolean virtualSpace) Adds the proposals because the cursor is at the end of the child at the given position.
void	addIdentifier(AbstractFromClause expression, java.lang.String identifier) Adds the given JPQL identifier as a valid proposal.
void	addTheBeginningOfChild(AbstractFromClause expression, CollectionExpression collectionExpression, int index, boolean hasComma) Adds the proposals because the cursor is at the beginning of the child Expression at the given position.
CollectionExpression	buildCollectionExpression(AbstractFromClause expression) Either returns the given Expression's child, which is already a CollectionExpression or requests this helper to return a "virtual" CollectionExpression that is wrapping the single element.
boolean	canContinue(AbstractFromClause expression, CollectionExpression collectionExpression, int index) Asks this helper if the search can continue even though two child expressions are not separated by a comma.
boolean	hasDelimiterAfterIdentifier(AbstractFromClause expression) Determines whether a delimiter like a whitespace or an open parenthesis was parsed after the identifier.
int	maxCollectionSize(AbstractFromClause expression) Returns the maximum number of encapsulated expressions the Expression allows.
int	preExpressionLength(AbstractFromClause expression) Returns the length of anything that can be defined before the first child.
JPQLQueryBNF	queryBNF(AbstractFromClause expression, int index) Returns the JPQLQueryBNF that defines the fragment at the given position.

Methods inherited from class java.lang.Object

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

Constructor Detail

FromClauseCollectionHelper

protected FromClauseCollectionHelper(AbstractContentAssistVisitor visitor)

Method Detail

addAtTheEndOfChild

public void addAtTheEndOfChild(AbstractFromClause expression,
                               CollectionExpression collectionExpression,
                               int index,
                               boolean hasComma,
                               boolean virtualSpace)

Adds the proposals because the cursor is at the end of the child at the given position.

Specified by:

addAtTheEndOfChild in interface AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Parameters:

expression - The Expression being visited

collectionExpression - The CollectionExpression is either the child of the given Expression or a temporary generated one that usually contains a single item

index - The position of that child in the collection of children

hasComma - Indicates whether a comma is present before the child at the given position; if the index is 0, then this is false by default

virtualSpace - Indicates if this method is called because the cursor is at the end of the child at the specified index but by considering there is a virtual space at the end of that child

addIdentifier

public void addIdentifier(AbstractFromClause expression,
                          java.lang.String identifier)

Adds the given JPQL identifier as a valid proposal.

Specified by:

addIdentifier in interface AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Parameters:

expression - The Expression being visited

identifier - The JPQL identifier to add as a valid proposal

addTheBeginningOfChild

public void addTheBeginningOfChild(AbstractFromClause expression,
                                   CollectionExpression collectionExpression,
                                   int index,
                                   boolean hasComma)

Adds the proposals because the cursor is at the beginning of the child Expression at the given position.

Specified by:

addTheBeginningOfChild in interface AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Parameters:

expression - The Expression being visited

collectionExpression - The CollectionExpression is either the child of the given Expression or a temporary generated one that usually contains a single item. This can be null if the position is at the beginning

index - The position of the child that was scanned

hasComma - Indicates whether a comma is present before the child at the given position; if the index is 0, then this is false by default

buildCollectionExpression

public CollectionExpression buildCollectionExpression(AbstractFromClause expression)

Either returns the given Expression's child, which is already a CollectionExpression or requests this helper to return a "virtual" CollectionExpression that is wrapping the single element.

Specified by:

buildCollectionExpression in interface AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Parameters:

expression - The parent of the children to retrieve

Returns:

The given expression's child or a "virtual" one

canContinue

public boolean canContinue(AbstractFromClause expression,
                           CollectionExpression collectionExpression,
                           int index)

Asks this helper if the search can continue even though two child expressions are not separated by a comma.

Specified by:

canContinue in interface AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Parameters:

expression - The Expression being visited

collectionExpression - The CollectionExpression

index - The position of the child being scanned

Returns:

true if the check can continue even though the previous child was not separated by a comma; false to stop the check

hasDelimiterAfterIdentifier

public boolean hasDelimiterAfterIdentifier(AbstractFromClause expression)

Determines whether a delimiter like a whitespace or an open parenthesis was parsed after the identifier.

Specified by:

hasDelimiterAfterIdentifier in interface AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Parameters:

expression - The Expression being visited

Returns:

true if something is present; false otherwise

maxCollectionSize

public int maxCollectionSize(AbstractFromClause expression)

Returns the maximum number of encapsulated expressions the Expression allows. Some expression only allow 2, others 3 and others allow an unlimited number.

Specified by:

maxCollectionSize in interface AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Parameters:

expression - The Expression for which its maximum number of children

Returns:

The maximum number of children the expression can have

preExpressionLength

public int preExpressionLength(AbstractFromClause expression)

Returns the length of anything that can be defined before the first child. An example can be "DISTINCT " in "AVG(DISTINCT e.name)".

Specified by:

preExpressionLength in interface AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Parameters:

expression - The Expression being visited

Returns:

The length of anything that was parsed before the first child or 0 if nothing was parsed

queryBNF

public JPQLQueryBNF queryBNF(AbstractFromClause expression,
                             int index)

Returns the JPQLQueryBNF that defines the fragment at the given position.

Specified by:

queryBNF in interface AbstractContentAssistVisitor.CollectionExpressionHelper<AbstractFromClause>

Parameters:

expression - The Expression being visited

index - The position of the element to retrieve the BNF defined in the JPQL grammar

Returns:

The JPQLQueryBNF that defines the fragment at the given position