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

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

All Implemented Interfaces:

StateObject

public class ArithmeticFactorStateObject
extends AbstractStateObject

This state object simply adds a plus or minus sign to the arithmetic primary expression.

BNF: arithmetic_factor ::= [{+|-}] arithmetic_primary

Version:

2.4

See Also:

ArithmeticFactor

Author:

Pascal Filion

Since:

2.4

Field Summary

static java.lang.String	ARITHMETIC_SIGN_PROPERTY Notifies the arithmetic sign property has changed.
static java.lang.String	STATE_OBJECT_PROPERTY Notifies the state object property has changed.

Constructor Summary

ArithmeticFactorStateObject(StateObject parent)
Creates a new ArithmeticFactorStateObject.

ArithmeticFactorStateObject(StateObject parent, boolean plusSign, StateObject stateObject)
Creates a new ArithmeticFactorStateObject.

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.
void	addMinus() Makes sure the - sign is used.
void	addPlus() Makes sure the + sign is used.
java.lang.String	getArithmeticSign() Returns the arithmetic sign this expression is actually representing.
ArithmeticFactor	getExpression() Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.
StateObject	getStateObject() Returns the StateObject that represents the arithmetic primary expression.
boolean	hasMinusSign() Determines whether the arithmetic sign is the minus sign.
boolean	hasPlusSign() Determines whether the arithmetic sign is the plus sign.
boolean	hasStateObject() Determines whether an StateObject representing the arithmetic primary expression exists.
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	parse(java.lang.String jpqlFragment) Parses the given JPQL fragment to become the new arithmetic primary.
void	setArithmeticSign(boolean plusSign) Sets the arithmetic sign this expression is actually representing.
void	setExpression(ArithmeticFactor 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	setStateObject(StateObject stateObject) Returns the StateObject that represents the arithmetic primary expression.
void	toggleArithmeticSign() Toggles the arithmetic sign, plus becomes minus and vice versa.
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, 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

ARITHMETIC_SIGN_PROPERTY

public static final java.lang.String ARITHMETIC_SIGN_PROPERTY

Notifies the arithmetic sign property has changed.

See Also:

Constant Field Values

STATE_OBJECT_PROPERTY

public static final java.lang.String STATE_OBJECT_PROPERTY

Notifies the state object property has changed.

See Also:

Constant Field Values

Constructor Detail

ArithmeticFactorStateObject

public ArithmeticFactorStateObject(StateObject parent)

Creates a new ArithmeticFactorStateObject.

Parameters:

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

Throws:

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

ArithmeticFactorStateObject

public ArithmeticFactorStateObject(StateObject parent,
                                   boolean plusSign,
                                   StateObject stateObject)

Creates a new ArithmeticFactorStateObject.

Parameters:

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

stateObject - The StateObject that represents the arithmetic primary expression

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

addMinus

public void addMinus()

Makes sure the - sign is used.

addPlus

public void addPlus()

Makes sure the + sign is used.

getArithmeticSign

public java.lang.String getArithmeticSign()

Returns the arithmetic sign this expression is actually representing.

Returns:

The single character value of the arithmetic sign: '+' or '-'

getExpression

public ArithmeticFactor 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)

getStateObject

public StateObject getStateObject()

Returns the StateObject that represents the arithmetic primary expression.

Returns:

The StateObject that represents the arithmetic primary expression or null if none was specified

hasMinusSign

public boolean hasMinusSign()

Determines whether the arithmetic sign is the minus sign.

Returns:

true if the arithmetic sign is the minus sign; false if it is the plus sign

hasPlusSign

public boolean hasPlusSign()

Determines whether the arithmetic sign is the plus sign.

Returns:

true if the arithmetic sign is the plus sign; false if it is the minus sign

hasStateObject

public boolean hasStateObject()

Determines whether an StateObject representing the arithmetic primary expression exists.

Returns:

true if there is the arithmetic primary expression exists; false otherwise

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

parse

public void parse(java.lang.String jpqlFragment)

Parses the given JPQL fragment to become the new arithmetic primary.

Parameters:

jpqlFragment - A portion of a query that will be parsed and the StateObject that was created will become the new arithmetic primary of this ArithmeticFactorStateObject

setArithmeticSign

public void setArithmeticSign(boolean plusSign)

Sets the arithmetic sign this expression is actually representing.

Parameters:

plusSign - The single character value of the arithmetic sign: '+' (true) or '-' (false)

setExpression

public void setExpression(ArithmeticFactor 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 an arithmetic factor expression

setStateObject

public void setStateObject(StateObject stateObject)

Returns the StateObject that represents the arithmetic primary expression.

Parameters:

stateObject - The StateObject that represents the arithmetic primary expression or null if none was specified

toggleArithmeticSign

public void toggleArithmeticSign()

Toggles the arithmetic sign, plus becomes minus and vice versa.

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