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

Class TrimExpressionStateObject

java.lang.Object

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractEncapsulatedExpressionStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractSingleEncapsulatedExpressionStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.TrimExpressionStateObject

All Implemented Interfaces:

StateObject

public class TrimExpressionStateObject
extends AbstractSingleEncapsulatedExpressionStateObject

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 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.

BNF: expression ::= TRIM([[trim_specification] [trim_character] FROM] string_primary)

Since:

2.4

Version:

2.5

Author:

Pascal Filion

See Also:

TrimExpression

Field Summary

Fields

Modifier and Type	Field	Description
static String	HAS_FROM_PROPERTY	Notifies the visibility of the FROM identifier has changed.
static String	SPECIFICATION_PROPERTY	Notifies the specification property has changed.
static String	TRIM_CHARACTER_PROPERTY	Notify the state object representing the trim character has changed.

Fields inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractSingleEncapsulatedExpressionStateObject

STATE_OBJECT_PROPERTY

Constructor Summary

Constructors

Constructor	Description
TrimExpressionStateObject(StateObject parent)	Creates a new TrimExpressionStateObject.
TrimExpressionStateObject(StateObject parent, String jpqlFragment)	Creates a new TrimExpressionStateObject.
TrimExpressionStateObject(StateObject parent, TrimExpression.Specification specification, StateObject stateObject)	Creates a new TrimExpressionStateObject.
TrimExpressionStateObject(StateObject parent, TrimExpression.Specification specification, StateObject trimCharacter, StateObject stateObject)	Creates a new TrimExpressionStateObject.

Method Summary

Modifier and Type	Method	Description
void	accept(StateObjectVisitor visitor)	Visits this StateObject by the given visitor.
TrimExpression	getExpression()	Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.
String	getIdentifier()	Returns the JPQL identifier of the expression represented by this AbstractSingleEncapsulatedExpressionStateObject.
protected String	getQueryBNFId()	Returns the unique identifier of the JPQLQueryBNF that will determine how to parse the encapsulated expression.
TrimExpression.Specification	getSpecification()	Returns the new trim specification.
StateObject	getTrimCharacter()	Returns the StateObject representing the trim character.
boolean	hasSpecification()	Determines whether the way the trim is trimmed was parsed.
boolean	hasTrimCharacter()	Determines whether the character used to trim the string was specified.
boolean	isEquivalent(StateObject stateObject)	Determines whether the given StateObject is equivalent to this one, i.e.
void	parse(String jpqlFragment)	Parses the given JPQL fragment, which represents the encapsulated expression, and creates the StateObject.
void	parseTrimCharacter(CharSequence jpqlFragment)	Parses the given JPQL fragment, which represents either a single-character string literal or a character-valued input parameter, the fragment will be parsed and converted into a StateObject.
void	removeSpecification()	Removes the trim specification.
void	removeTrimCharacter()	Removes the trim character if it is defined.
void	setExpression(TrimExpression expression)	Keeps a reference of the parsed object object, which should only be done when this object is instantiated during the conversion of a parsed JPQL query into StateObjects.
void	setSpecification(TrimExpression.Specification specification)	Sets the new trim specification.
void	setStateObject(StateObject stateObject)	Sets the given StateObject to represent the new encapsulated expression.
void	setTrimCharacter(StateObject trimCharacter)	Sets the character to trim from the string.
protected void	toTextEncapsulatedExpression(Appendable writer)	Prints out a string representation of this encapsulated information, which should not be used to define a true string representation of a JPQL query but should be used for debugging purposes.

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractSingleEncapsulatedExpressionStateObject

addChildren, getStateObject, hasStateObject

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractEncapsulatedExpressionStateObject

toTextInternal

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractStateObject

acceptUnknownVisitor, acceptUnknownVisitor, addProblems, addPropertyChangeListener, areEquivalent, buildProblem, buildProblem, buildStateObject, buildStateObjects, checkParent, children, decorate, equals, findIdentificationVariable, firePropertyChanged, getChangeSupport, getDeclaration, getDecorator, getGrammar, getManagedTypeProvider, getParent, getQueryBuilder, getRoot, getType, getType, getTypeHelper, getTypeRepository, hashCode, initialize, isDecorated, parent, parent, parent, removePropertyChangeListener, setExpression, setParent, toString, toString, toStringInternal, toStringItems, toText

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

HAS_FROM_PROPERTY

public static final String HAS_FROM_PROPERTY

Notifies the visibility of the FROM identifier has changed.

See Also:

Constant Field Values

SPECIFICATION_PROPERTY

public static final String SPECIFICATION_PROPERTY

Notifies the specification property has changed.

See Also:

Constant Field Values

TRIM_CHARACTER_PROPERTY

public static final String TRIM_CHARACTER_PROPERTY

Notify the state object representing the trim character has changed.

See Also:

Constant Field Values

Constructor Detail

TrimExpressionStateObject

public TrimExpressionStateObject(StateObject parent)

Creates a new TrimExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

Throws:

NullPointerException - The given parent cannot be null

TrimExpressionStateObject

public TrimExpressionStateObject(StateObject parent,
                                 TrimExpression.Specification specification,
                                 StateObject stateObject)

Creates a new TrimExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

stateObject - The StateObject representing the encapsulated expression

specification - Defines the way the string is trimmed, or Specification.DEFAULT when it is not present

Throws:

NullPointerException - The given parent cannot be null

TrimExpressionStateObject

public TrimExpressionStateObject(StateObject parent,
                                 TrimExpression.Specification specification,
                                 StateObject trimCharacter,
                                 StateObject stateObject)

Creates a new TrimExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

specification - Defines the way the string is trimmed, or Specification.DEFAULT when it is not present

trimCharacter - The trim character

stateObject - The StateObject representing the encapsulated expression

Throws:

NullPointerException - The given parent cannot be null

TrimExpressionStateObject

public TrimExpressionStateObject(StateObject parent,
                                 String jpqlFragment)

Creates a new TrimExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

jpqlFragment - The portion of the query representing the encapsulated expression

Throws:

NullPointerException - The given parent cannot be null

Method Detail

accept

public void accept(StateObjectVisitor visitor)

Description copied from interface: StateObject

Visits this StateObject by the given visitor.

Parameters:

visitor - The visitor to visit this object

getExpression

public TrimExpression getExpression()

Description copied from interface: StateObject

Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.

Specified by:

getExpression in interface StateObject

Overrides:

getExpression in class AbstractSingleEncapsulatedExpressionStateObject

Returns:

The parsed object when a JPQL query is parsed and converted into a StateObject or null when the JPQL query is manually created (i.e. not from a string)

getIdentifier

public String getIdentifier()

Description copied from class: AbstractEncapsulatedExpressionStateObject

Returns the JPQL identifier of the expression represented by this AbstractSingleEncapsulatedExpressionStateObject.

Specified by:

getIdentifier in class AbstractEncapsulatedExpressionStateObject

Returns:

The JPQL identifier that is shown before the left parenthesis

getQueryBNFId

protected String getQueryBNFId()

Description copied from class: AbstractSingleEncapsulatedExpressionStateObject

Returns the unique identifier of the JPQLQueryBNF that will determine how to parse the encapsulated expression.

Specified by:

getQueryBNFId in class AbstractSingleEncapsulatedExpressionStateObject

Returns:

The non-null ID of the BNF

getSpecification

public TrimExpression.Specification getSpecification()

Returns the new trim specification.

Returns:

The new trim specification; which is never null

getTrimCharacter

public StateObject getTrimCharacter()

Returns the StateObject representing the trim character.

Returns:

The StateObject representing the trim character or null if it is not present

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

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

isEquivalent

public boolean isEquivalent(StateObject stateObject)

Description copied from interface: StateObject

Determines whether the given StateObject is equivalent to this one, i.e. the information of both StateObject is the same.

Specified by:

isEquivalent in interface StateObject

Overrides:

isEquivalent in class AbstractSingleEncapsulatedExpressionStateObject

Parameters:

stateObject - The StateObject to compare its content to this one

Returns:

true if both object are equivalent; false otherwise

parse

public void parse(String jpqlFragment)

Description copied from class: AbstractSingleEncapsulatedExpressionStateObject

Parses the given JPQL fragment, which represents the encapsulated expression, and creates the StateObject.

Overrides:

parse in class AbstractSingleEncapsulatedExpressionStateObject

Parameters:

jpqlFragment - The portion of the query representing the encapsulated expression

parseTrimCharacter

public void parseTrimCharacter(CharSequence jpqlFragment)

Parses the given JPQL fragment, which represents either a single-character string literal or a character-valued input parameter, the fragment will be parsed and converted into a StateObject.

Parameters:

jpqlFragment - The portion of the query to parse

removeSpecification

public void removeSpecification()

Removes the trim specification.

removeTrimCharacter

public void removeTrimCharacter()

Removes the trim character if it is defined.

setExpression

public void setExpression(TrimExpression expression)

Keeps a reference of the parsed object object, which should only be done when this object is instantiated during the conversion of a parsed JPQL query into StateObjects.

Parameters:

expression - The parsed object representing a TRIM expression

setSpecification

public void setSpecification(TrimExpression.Specification specification)

Sets the new trim specification.

Parameters:

specification - The new trim specification; null is not valid

setStateObject

public void setStateObject(StateObject stateObject)

Description copied from class: AbstractSingleEncapsulatedExpressionStateObject

Sets the given StateObject to represent the new encapsulated expression.

Overrides:

setStateObject in class AbstractSingleEncapsulatedExpressionStateObject

Parameters:

stateObject - The new encapsulated StateObject

setTrimCharacter

public void setTrimCharacter(StateObject trimCharacter)

Sets the character to trim from the string. If the character to be trimmed is not specified, it is assumed to be space (or blank). It is a single-character string literal or a character- valued input parameter (i.e., char or Character).

Parameters:

trimCharacter - The trim character or null to remove it

toTextEncapsulatedExpression

protected void toTextEncapsulatedExpression(Appendable writer)
                                     throws IOException

Description copied from class: AbstractEncapsulatedExpressionStateObject

Prints out a string representation of this encapsulated information, which should not be used to define a true string representation of a JPQL query but should be used for debugging purposes.

Overrides:

toTextEncapsulatedExpression in class AbstractSingleEncapsulatedExpressionStateObject

Parameters:

writer - The writer used to print out the string representation of the encapsulated information

Throws:

IOException - This should never happens, only required because Appendable is used instead of StringBuilder for instance