org.eclipse.persistence.jpa.jpql.parser
Class SubstringExpression

java.lang.Object
  org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
      org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression
          org.eclipse.persistence.jpa.jpql.parser.AbstractTripleEncapsulatedExpression
              org.eclipse.persistence.jpa.jpql.parser.SubstringExpression

All Implemented Interfaces:

Expression

public final class SubstringExpression
extends AbstractTripleEncapsulatedExpression

The second and third arguments of the SUBSTRING function denote the starting position and length of the substring to be returned. These arguments are integers. The first position of a string is denoted by 1. The SUBSTRING function returns a string.

JPA 1.0:

BNF ::= SUBSTRING(string_primary, simple_arithmetic_expression, simple_arithmetic_expression)

JPA 2.0:

BNF ::= SUBSTRING(string_primary, simple_arithmetic_expression [, simple_arithmetic_expression])

JPA 2.1:

BNF ::= SUBSTRING(string_expression, arithmetic_expression [, arithmetic_expression])

Example: UPDATE Employee e SET e.firstName = SUBSTRING('TopLink Workbench', 1, 8)

Version:

2.4

Author:

Pascal Filion

Since:

2.3

Field Summary

Fields inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractTripleEncapsulatedExpression

parameterIndex

Fields inherited from class org.eclipse.persistence.jpa.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.jpql.parser.Expression

ABS, ALL, AND, ANY, AS, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, CASE, CAST, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, COLUMN, CONCAT, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXCEPT, EXISTS, EXTRACT, FALSE, FETCH, FROM, FUNC, FUNCTION, GREATER_THAN, GREATER_THAN_OR_EQUAL, GROUP_BY, HAVING, IN, INDEX, INNER, INNER_JOIN, INNER_JOIN_FETCH, INTERSECT, 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_EQUAL, NOT_EXISTS, NOT_IN, NOT_LIKE, NOT_MEMBER, NOT_MEMBER_OF, NULL, NULLIF, NULLS_FIRST, NULLS_LAST, OBJECT, OF, ON, OPERATOR, OR, ORDER_BY, OUTER, PLUS, POSITION, POSITIONAL_PARAMETER, QUOTE, REGEXP, SELECT, SET, SIZE, SOME, SQL, SQRT, SUBSTRING, SUM, TABLE, THEN, TRAILING, TREAT, TRIM, TRUE, TYPE, UNION, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE

Constructor Summary

SubstringExpression(AbstractExpression parent)
Creates a new SubstringExpression.

Method Summary

void	accept(ExpressionVisitor visitor) Visits this Expression by the given visitor.
JPQLQueryBNF	getQueryBNF() Returns the BNF of this Expression.
protected boolean	isThirdExpressionOptional() Determines whether the third expression is an optional expression, which means a valid query can have it or not.
java.lang.String	parameterExpressionBNF(int index) Returns the BNF to be used to parse one of the encapsulated expression.
protected java.lang.String	parseIdentifier(WordParser wordParser) Parses the identifier of this expression.

Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractTripleEncapsulatedExpression

acceptChildren, addChildrenTo, addOrderedEncapsulatedExpressionTo, buildCollectionExpression, findQueryBNF, getFirstExpression, getSecondExpression, getThirdExpression, hasEncapsulatedExpression, hasFirstComma, hasFirstExpression, hasSecondComma, hasSecondExpression, hasSpaceAfterFirstComma, hasSpaceAfterSecondComma, hasThirdExpression, isParsingComplete, parseEncapsulatedExpression, removeEncapsulatedExpression, toParsedTextEncapsulatedExpression

Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression

addOrderedChildrenTo, areLogicalIdentifiersSupported, getActualIdentifier, getIdentifier, hasLeftParenthesis, hasRightParenthesis, hasSpaceAfterIdentifier, parse, shouldParseRightParenthesis, toParsedText

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

acceptUnknownVisitor, acceptUnknownVisitor, buildExpressionFromFallingBack, buildNullExpression, buildStringExpression, buildStringExpression, buildUnknownExpression, calculatePosition, children, findFallBackExpressionFactory, getExpressionFactory, getExpressionRegistry, getGrammar, getIdentifierVersion, getJPAVersion, getLength, getOffset, getParent, getQueryBNF, getRoot, getText, handleAggregate, handleCollection, isAncestor, isIdentifier, isNull, isTolerant, isUnknown, isVirtual, orderedChildren, parse, parseUsingExpressionFactory, populatePosition, rebuildActualText, rebuildParsedText, setParent, setText, shouldParseWithFactoryFirst, shouldSkipLiteral, toActualText, toParsedText, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

SubstringExpression

public SubstringExpression(AbstractExpression parent)

Creates a new SubstringExpression.

Parameters:

parent - The parent of this expression

Method Detail

accept

public void accept(ExpressionVisitor visitor)

Visits this Expression by the given visitor.

Parameters:

visitor - The ExpressionVisitor to visit this object

getQueryBNF

public JPQLQueryBNF getQueryBNF()

Returns the BNF of this Expression.

Returns:

The JPQLQueryBNF, which represents the grammar of this Expression

isThirdExpressionOptional

protected boolean isThirdExpressionOptional()

Determines whether the third expression is an optional expression, which means a valid query can have it or not.

Specified by:

isThirdExpressionOptional in class AbstractTripleEncapsulatedExpression

Returns:

true if the third expression can either be present or not in a valid query; false if it's mandatory

parameterExpressionBNF

public java.lang.String parameterExpressionBNF(int index)

Returns the BNF to be used to parse one of the encapsulated expression.

Specified by:

parameterExpressionBNF in class AbstractTripleEncapsulatedExpression

Parameters:

index - The position of the encapsulated Expression that needs to be parsed within the parenthesis, which starts at position 0

Returns:

The BNF to be used to parse one of the encapsulated expression

parseIdentifier

protected java.lang.String parseIdentifier(WordParser wordParser)

Parses the identifier of this expression.

Specified by:

parseIdentifier in class AbstractEncapsulatedExpression

Returns:

The identifier for this expression