org.eclipse.persistence.jpa.internal.jpql.parser

Class CollectionExpression

java.lang.Object

org.eclipse.persistence.jpa.internal.jpql.parser.StringExpression

org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression

org.eclipse.persistence.jpa.internal.jpql.parser.CollectionExpression

All Implemented Interfaces:

Expression

public final class CollectionExpression
extends AbstractExpression

A CollectionExpression wraps many expression which they are separated by spaces and/or commas.

BNF: expression ::= child_item {, child_item }*
or

BNF: expression ::= child_item { child_item }*

Since:

2.3

Version:

2.3

Author:

Pascal Filion

Field Summary

Fields inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression

COMMA, DOT, DOUBLE_QUOTE, LEFT_CURLY_BRACKET, LEFT_PARENTHESIS, NOT_DEFINED, RIGHT_CURLY_BRACKET, RIGHT_PARENTHESIS, SINGLE_QUOTE, SPACE, UNDERSCORE

Fields inherited from interface org.eclipse.persistence.jpa.internal.jpql.parser.Expression

ABS, ALL, AND, ANY, AS, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, CASE, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, CONCAT, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXISTS, FALSE, FETCH, FROM, FUNC, GREATER_THAN, GREATER_THAN_OR_EQUAL, GROUP_BY, HAVING, IN, INDEX, INNER, INNER_JOIN, INNER_JOIN_FETCH, IS, IS_EMPTY, IS_NOT_EMPTY, IS_NOT_NULL, IS_NULL, JOIN, JOIN_FETCH, KEY, LEADING, LEFT, LEFT_JOIN, LEFT_JOIN_FETCH, LEFT_OUTER_JOIN, LEFT_OUTER_JOIN_FETCH, LENGTH, LIKE, LOCATE, LOWER, LOWER_THAN, LOWER_THAN_OR_EQUAL, MAX, MEMBER, MEMBER_OF, MIN, MINUS, MOD, MULTIPLICATION, NAMED_PARAMETER, NEW, NOT, NOT_BETWEEN, NOT_EXISTS, NOT_IN, NOT_LIKE, NOT_MEMBER, NOT_MEMBER_OF, NULL, NULLIF, OBJECT, OF, OR, ORDER_BY, OUTER, PLUS, POSITION, POSITIONAL_PARAMETER, QUOTE, SELECT, SET, SIZE, SOME, SQRT, SUBSTRING, SUM, THEN, TRAILING, TREAT, TRIM, TRUE, TYPE, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(ExpressionVisitor visitor) Visits this Expression by the given visitor.
void	acceptChildren(ExpressionVisitor visitor) Visits the children of this Expression.
int	childrenSize() Returns the count of child expressions.
boolean	endsWithComma() Determines whether this CollectionExpression ends with a comma, which means the last Expression is a "null" expression.
boolean	endsWithSpace() Determines whether this CollectionExpression ends with a space, which means the last Expression is a "null" expression.
JPQLQueryBNF	findQueryBNF(AbstractExpression expression) Retrieves the JPQLQueryBNF that was used to parse the given Expression.
Expression	getChild(int index) Retrieves the child Expression at the given position.
JPQLQueryBNF	getQueryBNF() Returns the BNF of this Expression.
boolean	hasComma(int index) Determines whether a comma was parsed at the given position.
boolean	hasSpace(int index) Determines whether a space was parsed at the given position.
int	indexOf(Expression expression) Retrieves the index of the given Expression.
java.lang.String	toActualText(int endIndex) Returns a string representation of this Expression and its children.
java.lang.String	toParsedText(int endIndex) Generates a string representation of this CollectionExpression.

Methods inherited from class org.eclipse.persistence.jpa.internal.jpql.parser.AbstractExpression

children, getChildren, getParent, getRoot, identifierRole, identifiers, identifierVersion, isAncestor, isIdentifier, isVirtual, orderedChildren, queryBNF, toActualText, toParsedText, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

accept

public void accept(ExpressionVisitor visitor)

Visits this Expression by the given visitor.

Parameters:

visitor - The visitor to visit this object

acceptChildren

public void acceptChildren(ExpressionVisitor visitor)

Visits the children of this Expression. This method can be used to optimize traversing the children since a new list is not created every time Expression.children() or Expression.getChildren() is called.

This does not traverse the Expression sub-hierarchy, use an subclass of AbstractTraverseChildrenVisitor in order to traverse the entire sub-hierarchy.

Parameters:

visitor - The visitor to visit the children of this object.

childrenSize

public int childrenSize()

Returns the count of child expressions.

Returns:

The total count of expressions aggregated with spaces and/or commas

endsWithComma

public boolean endsWithComma()

Determines whether this CollectionExpression ends with a comma, which means the last Expression is a "null" expression.

Returns:

true if the string representation of this CollectionExpression ends with a comma (the ending space is not checked)

endsWithSpace

public boolean endsWithSpace()

Determines whether this CollectionExpression ends with a space, which means the last Expression is a "null" expression.

Returns:

true if the string representation of this CollectionExpression ends with a space (the ending comma is not checked)

findQueryBNF

public JPQLQueryBNF findQueryBNF(AbstractExpression expression)

Retrieves the JPQLQueryBNF that was used to parse the given Expression.

Overrides:

findQueryBNF in class AbstractExpression

Parameters:

expression - The expression for which its BNF is needed

Returns:

The JPQLQueryBNF that was used to parse the given expression

getChild

public Expression getChild(int index)

Retrieves the child Expression at the given position.

Parameters:

index - The position of the child Expression to retrieve

Returns:

The child Expression at the given position

getQueryBNF

public JPQLQueryBNF getQueryBNF()

Returns the BNF of this Expression.

Specified by:

getQueryBNF in class AbstractExpression

Returns:

The JPQLQueryBNF, which represents the grammar of this Expression

hasComma

public boolean hasComma(int index)

Determines whether a comma was parsed at the given position. The index is the position of the comma that is following the child at the same position.

Parameters:

index - The index of the child Expression to verify if there is a comma following it

Returns:

true if a comma is following the child Expression at the given index; false otherwise

hasSpace

public boolean hasSpace(int index)

Determines whether a space was parsed at the given position. The index is the position of the space that is following the child at the same position, which is after a comma, if one was also parsed at that location.

Parameters:

index - The index of the child Expression to verify if there is a space following it, which could be after a comma, if one was parsed

Returns:

true if a space is following the child Expression at the given index; false otherwise

indexOf

public int indexOf(Expression expression)

Retrieves the index of the given Expression.

Parameters:

expression - The Expression that might be a child of this expression

Returns:

The index in the collection of the given Expression or -1 if it is not a child

toActualText

public java.lang.String toActualText(int endIndex)

Returns a string representation of this Expression and its children. The expression should contain whitespace even if the beautified version would not have any. For instance, "SELECT e " should be returned where Expression#toText() would return "SELECT e".

Parameters:

endIndex - The index used to determine when to create the string representation, which is exclusive

writer - The buffer used to append this CollectionExpression's string representation

Returns:

The string representation of this Expression

toParsedText

public java.lang.String toParsedText(int endIndex)

Generates a string representation of this CollectionExpression.

Parameters:

endIndex - The index used to determine when to create the string representation, which is exclusive

writer - The buffer used to append this CollectionExpression's string representation

Returns:

The string representation of this Expression