org.eclipse.persistence.jpa.jpql.model.query
Class LikeExpressionStateObject

java.lang.Object
  org.eclipse.persistence.jpa.jpql.model.query.AbstractStateObject
      org.eclipse.persistence.jpa.jpql.model.query.LikeExpressionStateObject

All Implemented Interfaces:

StateObject

public class LikeExpressionStateObject
extends AbstractStateObject

The LIKE condition is used to specify a search for a pattern.

The string_expression must have a string value. The pattern_value is a string literal or a string-valued input parameter in which an underscore (_) stands for any single character, a percent (%) character stands for any sequence of characters (including the empty sequence), and all other characters stand for themselves. The optional escape_character is a single-character string literal or a character-valued input parameter (i.e., char or Character) and is used to escape the special meaning of the underscore and percent characters in pattern_value.

BNF: like_expression ::= string_expression [NOT] LIKE pattern_value [ESCAPE escape_character]

Version:

2.4

See Also:

LikeExpression

Author:

Pascal Filion

Since:

2.4

Field Summary

static java.lang.String	ESCAPE_CHARACTER_PROPERTY Notifies the escape character property has changed.
static java.lang.String	NOT_PROPERTY Notifies the visibility of the NOT identifier has changed.
static java.lang.String	PATTERN_VALUE_PROPERTY Notifies the pattern value property has changed.
static java.lang.String	STRING_STATE_OBJECT_PROPERTY Notifies the string state object property has changed.

Constructor Summary

LikeExpressionStateObject(StateObject parent)
Creates a new LikeExpressionStateObject.

LikeExpressionStateObject(StateObject parent, StateObject stringStateObject)
Creates a new LikeExpressionStateObject.

LikeExpressionStateObject(StateObject parent, StateObject stringStateObject, boolean not, StateObject patternValue, java.lang.String escapeCharacter)
Creates a new LikeExpressionStateObject.

LikeExpressionStateObject(StateObject parent, StateObject stringStateObject, StateObject patternValue)
Creates a new LikeExpressionStateObject.

Method Summary

void	accept(StateObjectVisitor visitor) Visits this StateObject by the given visitor.
protected void	addChildren(java.util.List<StateObject> children) Adds the children of this StateObject to the given list.
LikeExpressionStateObject	addNot() Makes sure the NOT identifier is specified.
java.lang.String	getEscapeCharacter()
LikeExpression	getExpression() Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.
StateObject	getPatternValue()
StateObject	getStringStateObject()
boolean	hasEscapeCharacter()
boolean	hasNot() Determines whether the NOT identifier is used or not.
boolean	hasPatternValue()
boolean	hasStringStateObject()
protected void	initialize() Initializes this state object.
boolean	isEquivalent(StateObject stateObject) Determines whether the given StateObject is equivalent to this one, i.e. the information of both StateObject is the same.
void	removeNot() Makes sure the NOT identifier is not specified.
void	setEscapeCharacter(java.lang.String escapeCharacter)
void	setExpression(LikeExpression 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	setNot(boolean not) Sets whether the NOT identifier should be part of the expression or not.
void	setPatternValue(StateObject patternValue)
void	setStringStateObject(StateObject stringStateObject)
void	toggleNot() Changes the visibility state of the NOT identifier.
protected void	toTextInternal(java.lang.Appendable writer) Prints out a string representation of this StateObject, 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.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, 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

ESCAPE_CHARACTER_PROPERTY

public static final java.lang.String ESCAPE_CHARACTER_PROPERTY

Notifies the escape character property has changed.

See Also:

Constant Field Values

NOT_PROPERTY

public static java.lang.String NOT_PROPERTY

Notifies the visibility of the NOT identifier has changed.

PATTERN_VALUE_PROPERTY

public static final java.lang.String PATTERN_VALUE_PROPERTY

Notifies the pattern value property has changed.

See Also:

Constant Field Values

STRING_STATE_OBJECT_PROPERTY

public static final java.lang.String STRING_STATE_OBJECT_PROPERTY

Notifies the string state object property has changed.

See Also:

Constant Field Values

Constructor Detail

LikeExpressionStateObject

public LikeExpressionStateObject(StateObject parent)

Creates a new LikeExpressionStateObject.

Parameters:

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

Throws:

java.lang.NullPointerException - The given parent cannot be null

LikeExpressionStateObject

public LikeExpressionStateObject(StateObject parent,
                                 StateObject stringStateObject)

Creates a new LikeExpressionStateObject.

Parameters:

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

stringStateObject - The StateObject representing the string expression

Throws:

java.lang.NullPointerException - The given parent cannot be null

LikeExpressionStateObject

public LikeExpressionStateObject(StateObject parent,
                                 StateObject stringStateObject,
                                 boolean not,
                                 StateObject patternValue,
                                 java.lang.String escapeCharacter)

Creates a new LikeExpressionStateObject.

Parameters:

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

stringStateObject - The StateObject representing the string expression

not - Determines whether the NOT identifier is part of the expression or not

patternValue - A string literal or a string-valued input parameter in which an underscore (_) stands for any single character, a percent (%) character stands for any sequence of characters (including the empty sequence), and all other characters stand for themselves

escapeCharacter - A single-character string literal or a character-valued input parameter (i.e., char or Character) and is used to escape the special meaning of the underscore and percent characters in pattern_value

Throws:

java.lang.NullPointerException - The given parent cannot be null

LikeExpressionStateObject

public LikeExpressionStateObject(StateObject parent,
                                 StateObject stringStateObject,
                                 StateObject patternValue)

Creates a new LikeExpressionStateObject.

Parameters:

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

stringStateObject - The StateObject representing the string expression

patternValue - a string literal or a string-valued input parameter in which an underscore (_) stands for any single character, a percent (%) character stands for any sequence of characters (including the empty sequence), and all other characters stand for themselves

Throws:

java.lang.NullPointerException - The given parent cannot be null

Method Detail

accept

public void accept(StateObjectVisitor visitor)

Visits this StateObject by the given visitor.

Parameters:

visitor - The visitor to visit this object

addChildren

protected void addChildren(java.util.List<StateObject> children)

Adds the children of this StateObject to the given list.

Overrides:

addChildren in class AbstractStateObject

Parameters:

children - The list used to store the children

addNot

public LikeExpressionStateObject addNot()

Makes sure the NOT identifier is specified.

Returns:

This object

getEscapeCharacter

public java.lang.String getEscapeCharacter()

getExpression

public LikeExpression getExpression()

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 AbstractStateObject

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)

getPatternValue

public StateObject getPatternValue()

getStringStateObject

public StateObject getStringStateObject()

hasEscapeCharacter

public boolean hasEscapeCharacter()

hasNot

public boolean hasNot()

Determines whether the NOT identifier is used or not.

Returns:

true if the NOT identifier is part of the expression; false otherwise

hasPatternValue

public boolean hasPatternValue()

hasStringStateObject

public boolean hasStringStateObject()

initialize

protected void initialize()

Initializes this state object.

Overrides:

initialize in class AbstractStateObject

isEquivalent

public boolean isEquivalent(StateObject 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 AbstractStateObject

Parameters:

stateObject - The StateObject to compare its content to this one

Returns:

true if both object are equivalent; false otherwise

removeNot

public void removeNot()

Makes sure the NOT identifier is not specified.

setEscapeCharacter

public void setEscapeCharacter(java.lang.String escapeCharacter)

setExpression

public void setExpression(LikeExpression 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 LIKE expression

setNot

public void setNot(boolean not)

Sets whether the NOT identifier should be part of the expression or not.

Parameters:

not - true if the NOT identifier should be part of the expression; false otherwise

setPatternValue

public void setPatternValue(StateObject patternValue)

setStringStateObject

public void setStringStateObject(StateObject stringStateObject)

toggleNot

public void toggleNot()

Changes the visibility state of the NOT identifier.

toTextInternal

protected void toTextInternal(java.lang.Appendable writer)
                       throws java.io.IOException

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

Specified by:

toTextInternal in class AbstractStateObject

Parameters:

writer - The writer used to print out the string representation

Throws:

java.io.IOException - This should never happens, it is only required because Appendable is used instead of any concrete class