Class TrimExpression
java.lang.Object
org.eclipse.persistence.jpa.jpql.parser.AbstractExpression
org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression
org.eclipse.persistence.jpa.jpql.parser.AbstractSingleEncapsulatedExpression
org.eclipse.persistence.jpa.jpql.parser.TrimExpression
- All Implemented Interfaces:
Expression
The TRIM function trims the specified character from a string. If the character to be
trimmed is not specified, it is assumed to be space (or blank). The optional
JPA 2.1:
trim_character
is a single-character string literal or a character-valued input parameter (i.e., char or
Character). If a trim specification is not provided, BOTH is assumed. The TRIM
function returns the trimmed string.
JPA 1.0, 2.0:
BNF:
expression ::= TRIM([[trim_specification] [trim_character] FROM] string_primary)
BNF:
trim_character ::= string_literal | input_parameter
JPA 2.1:
BNF:
expression ::= TRIM([[trim_specification] [trim_character] FROM] string_expression)
BNF:
trim_character ::= string_literal | input_parameter
Example:
UPDATE Student st SET st.sname=TRIM(st.sname)
- Since:
- 2.3
- Version:
- 2.5
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Nested Class Summary
Modifier and TypeClassDescriptionstatic enum
The possible ways to trim the string. -
Field Summary
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, AS_OF, ASC, AVG, BETWEEN, BIT_LENGTH, BOTH, CASE, CAST, CEILING, CHAR_LENGTH, CHARACTER_LENGTH, CLASS, COALESCE, COLUMN, CONCAT, CONNECT_BY, COUNT, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DATE, DATETIME, DELETE, DELETE_FROM, DESC, DIFFERENT, DISTINCT, DIVISION, ELSE, EMPTY, END, ENTRY, EQUAL, ESCAPE, EXCEPT, EXISTS, EXP, EXTRACT, FALSE, FETCH, FIRST, FLOOR, 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, LAST, LEADING, LEFT, LEFT_JOIN, LEFT_JOIN_FETCH, LEFT_OUTER_JOIN, LEFT_OUTER_JOIN_FETCH, LENGTH, LIKE, LN, LOCAL, 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, NULLS_FIRST, NULLS_LAST, OBJECT, OF, ON, OPERATOR, OR, ORDER_BY, ORDER_SIBLINGS_BY, OUTER, PLUS, POSITION, POSITIONAL_PARAMETER, POWER, QUOTE, REGEXP, ROUND, SCN, SELECT, SET, SIGN, SIZE, SOME, SQL, SQRT, START_WITH, SUBSTRING, SUM, TABLE, THEN, TIME, TIMESTAMP, TRAILING, TREAT, TRIM, TRUE, TYPE, UNION, UNKNOWN, UPDATE, UPPER, VALUE, WHEN, WHERE
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
accept
(ExpressionVisitor visitor) Visits thisExpression
by the givenvisitor
.void
acceptChildren
(ExpressionVisitor visitor) Visits the children of thisExpression
.protected void
addOrderedEncapsulatedExpressionTo
(List<Expression> children) Adds theExpressions
representing the encapsulatedExpression
.Returns the actual FROM identifier found in the string representation of the JPQL query, which has the actual case that was used.Returns the actual specification identifier found in the string representation of the JPQL query, which has the actual case that was used.Returns the BNF used to parse the encapsulated expression.Returns the BNF of thisExpression
.Returns the specification which specifies how to trim the string.Returns the character used for trimming the string.boolean
Determines whether something was parsed after the left parenthesis.boolean
hasFrom()
Determines whether the identifier FROM was part of the query.boolean
Determines whether a whitespace was found after FROM.boolean
Determines whether a whitespace was found after the way the string is trimmed.boolean
Determines whether a whitespace was found after the character used to trim the string.boolean
Determines whether the way the trim is trimmed was parsed.boolean
Determines whether the character used to trim the string was specified.protected void
parseEncapsulatedExpression
(WordParser wordParser, int whitespaceCount, boolean tolerant) Parses the encapsulated expression by starting at the current position, which is part of the givenWordParser
.protected void
toParsedTextEncapsulatedExpression
(StringBuilder writer, boolean actual) Generates a string representation of the encapsulatedExpression
.Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractSingleEncapsulatedExpression
addChildrenTo, findQueryBNF, getExpression, hasExpression, removeEncapsulatedExpression, setExpression
Methods inherited from class org.eclipse.persistence.jpa.jpql.parser.AbstractEncapsulatedExpression
addOrderedChildrenTo, areLogicalIdentifiersSupported, getActualIdentifier, getIdentifier, hasLeftParenthesis, hasRightParenthesis, hasSpaceAfterIdentifier, isParsingComplete, 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
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Constructor Details
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TrimExpression
Creates a newTrimExpression
.- Parameters:
parent
- The parent of this expression
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Method Details
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accept
Description copied from interface:Expression
Visits thisExpression
by the givenvisitor
.- Parameters:
visitor
- TheExpressionVisitor
to visit this object
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acceptChildren
Description copied from interface:Expression
Visits the children of thisExpression
. This method can be used to optimize traversing the children since a new list is not created every timeExpression.children()
is called.This does not traverse the
Expression
sub-hierarchy, use a subclass ofAbstractTraverseChildrenVisitor
in order to traverse the entire sub-hierarchy.- Specified by:
acceptChildren
in interfaceExpression
- Overrides:
acceptChildren
in classAbstractSingleEncapsulatedExpression
- Parameters:
visitor
- Thevisitor
to visit the children of this object.
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addOrderedEncapsulatedExpressionTo
Description copied from class:AbstractEncapsulatedExpression
Adds theExpressions
representing the encapsulatedExpression
.- Overrides:
addOrderedEncapsulatedExpressionTo
in classAbstractSingleEncapsulatedExpression
- Parameters:
children
- The list used to store the string representation of the encapsulatedExpression
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getEncapsulatedExpressionQueryBNFId
Description copied from class:AbstractSingleEncapsulatedExpression
Returns the BNF used to parse the encapsulated expression.- Specified by:
getEncapsulatedExpressionQueryBNFId
in classAbstractSingleEncapsulatedExpression
- Returns:
- The BNF used to parse the encapsulated expression
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getActualFromIdentifier
Returns the actual FROM identifier found in the string representation of the JPQL query, which has the actual case that was used.- Returns:
- The FROM identifier that was actually parsed, or an empty string if it was not parsed
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getActualSpecificationIdentifier
Returns the actual specification identifier found in the string representation of the JPQL query, which has the actual case that was used.- Returns:
- The specification identifier that was actually parsed, or an empty string if it was not parsed
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getQueryBNF
Description copied from interface:Expression
Returns the BNF of thisExpression
.- Returns:
- The
JPQLQueryBNF
, which represents the grammar of thisExpression
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getSpecification
Returns the specification which specifies how to trim the string.- Returns:
- One of the available choices for trimming the string
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getTrimCharacter
Returns the character used for trimming the string.- Returns:
- The character, if one was parsed, that will be used to trim the string. If the character was not specified, then '\0' is the character
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hasEncapsulatedExpression
public boolean hasEncapsulatedExpression()Description copied from class:AbstractEncapsulatedExpression
Determines whether something was parsed after the left parenthesis.- Overrides:
hasEncapsulatedExpression
in classAbstractSingleEncapsulatedExpression
- Returns:
true
if something was parsed;false
otherwise
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hasFrom
public boolean hasFrom()Determines whether the identifier FROM was part of the query.- Returns:
true
if the identifier FROM was parsed;false
otherwise
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hasSpaceAfterFrom
public boolean hasSpaceAfterFrom()Determines whether a whitespace was found after FROM.- Returns:
true
if there was a whitespace after FROM;false
otherwise
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hasSpaceAfterSpecification
public boolean hasSpaceAfterSpecification()Determines whether a whitespace was found after the way the string is trimmed.- Returns:
true
if there was a whitespace after the trim specification;false
otherwise
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hasSpaceAfterTrimCharacter
public boolean hasSpaceAfterTrimCharacter()Determines whether a whitespace was found after the character used to trim the string.- Returns:
true
if there was a whitespace after the trim character;false
otherwise
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hasSpecification
public boolean hasSpecification()Determines whether the way the trim is trimmed was parsed.- Returns:
true
if the query contained the way the trim needs to be trimmed;false
otherwise
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hasTrimCharacter
public boolean hasTrimCharacter()Determines whether the character used to trim the string was specified.- Returns:
true
if the character used for trimming was specified;false
otherwise
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parseEncapsulatedExpression
protected void parseEncapsulatedExpression(WordParser wordParser, int whitespaceCount, boolean tolerant) Description copied from class:AbstractEncapsulatedExpression
Parses the encapsulated expression by starting at the current position, which is part of the givenWordParser
.- Overrides:
parseEncapsulatedExpression
in classAbstractSingleEncapsulatedExpression
- Parameters:
wordParser
- The text to parse based on the current position of the cursorwhitespaceCount
- The number of whitespace characters that were parsed after '('tolerant
- Determines whether the parsing system should be tolerant, meaning if it should try to parse invalid or incomplete queries
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toParsedTextEncapsulatedExpression
Description copied from class:AbstractEncapsulatedExpression
Generates a string representation of the encapsulatedExpression
.- Overrides:
toParsedTextEncapsulatedExpression
in classAbstractSingleEncapsulatedExpression
- Parameters:
writer
- The buffer used to append the encapsulatedExpression
's string representationactual
- Determines whether to include any characters that are considered virtual, i.e. that was parsed when the query is incomplete and is needed for functionality like content assist
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