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

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

All Implemented Interfaces:

StateObject

Direct Known Subclasses:

HavingClauseStateObject, WhenClauseStateObject, WhereClauseStateObject

public abstract class AbstractConditionalClauseStateObject
extends AbstractStateObject

Conditional expressions are composed of other conditional expressions, comparison operations, logical operations, path expressions that evaluate to boolean values, boolean literals, and boolean input parameters. Arithmetic expressions can be used in comparison expressions. Arithmetic expressions are composed of other arithmetic expressions, arithmetic operations, path expressions that evaluate to numeric values, numeric literals, and numeric input parameters. Arithmetic operations use numeric promotion. Standard bracketing () for ordering expression evaluation is supported.

BNF: expression ::= identifier conditional_expression

Version:

2.4

See Also:

AbstractConditionalClause

Author:

Pascal Filion

Since:

2.4

Field Summary

static java.lang.String

CONDITIONAL_STATE_OBJECT_PROPERTY Notifies the conditional expression property has changed.

Constructor Summary

protected	AbstractConditionalClauseStateObject(StateObject parent) Creates a new AbstractConditionalClauseStateObject.
protected	AbstractConditionalClauseStateObject(StateObject parent, StateObject conditionalStateObject) Creates a new AbstractConditionalClauseStateObject.

Method Summary

protected void	addChildren(java.util.List<StateObject> children) Adds the children of this StateObject to the given list.
AndExpressionStateObject	andParse(java.lang.String jpqlFragment) Parses the given JPQL fragment as the right side of an AND expression.
IConditionalExpressionStateObjectBuilder	getBuilder() Creates and returns a new IConditionalExpressionStateObjectBuilder that can be used to programmatically create a conditional expression and once the expression is complete, IConditionalExpressionStateObjectBuilder.commit() will push the StateObject representation of that expression as this clause's conditional expression.
StateObject	getConditional() Returns the state object representing the composition of the conditional expressions.
abstract java.lang.String	getIdentifier() Returns the JPQL identifier of this clause.
boolean	hasConditional() Determines whether the StateObject representing the conditional expression is present or not.
boolean	isEquivalent(StateObject stateObject) Determines whether the given StateObject is equivalent to this one, i.e. the information of both StateObject is the same.
OrExpressionStateObject	orParse(java.lang.String jpqlFragment) Parses the given JPQL fragment as the right side of an OR expression.
void	parse(java.lang.String jpqlFragment) Parses the given JPQL fragment, which represents a conditional expression, and creates the StateObject.
void	setConditional(StateObject conditionalStateObject) Sets the given StateObject to be the conditional expression of this clause.
protected boolean	shouldEncapsulateORExpression(StateObject stateObject)
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, getExpression, 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

Methods inherited from interface org.eclipse.persistence.jpa.jpql.model.query.StateObject

accept

Field Detail

CONDITIONAL_STATE_OBJECT_PROPERTY

public static final java.lang.String CONDITIONAL_STATE_OBJECT_PROPERTY

Notifies the conditional expression property has changed.

See Also:

Constant Field Values

Constructor Detail

AbstractConditionalClauseStateObject

protected AbstractConditionalClauseStateObject(StateObject parent)

Creates a new AbstractConditionalClauseStateObject.

Parameters:

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

Throws:

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

AbstractConditionalClauseStateObject

protected AbstractConditionalClauseStateObject(StateObject parent,
                                               StateObject conditionalStateObject)

Creates a new AbstractConditionalClauseStateObject.

Parameters:

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

conditionalStateObject - The StateObject representing the conditional expression

Throws:

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

Method Detail

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

andParse

public AndExpressionStateObject andParse(java.lang.String jpqlFragment)

Parses the given JPQL fragment as the right side of an AND expression. The current conditional expression will become the left side of the AND expression.

Parameters:

jpqlFragment - The portion of the query representing the right side of the AND expression

Returns:

The newly created AndExpressionStateObject

getBuilder

public IConditionalExpressionStateObjectBuilder getBuilder()

Creates and returns a new IConditionalExpressionStateObjectBuilder that can be used to programmatically create a conditional expression and once the expression is complete, IConditionalExpressionStateObjectBuilder.commit() will push the StateObject representation of that expression as this clause's conditional expression.

Returns:

A new builder that can be used to quickly create a conditional expression

getConditional

public StateObject getConditional()

Returns the state object representing the composition of the conditional expressions.

Returns:

The actual conditional expression

getIdentifier

public abstract java.lang.String getIdentifier()

Returns the JPQL identifier of this clause.

Returns:

The JPQL identifier of this conditional clause

hasConditional

public boolean hasConditional()

Determines whether the StateObject representing the conditional expression is present or not.

Returns:

true if the conditional expression is not null; 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

orParse

public OrExpressionStateObject orParse(java.lang.String jpqlFragment)

Parses the given JPQL fragment as the right side of an OR expression. The current conditional expression will become the left side of the OR expression.

Parameters:

jpqlFragment - The portion of the query representing the right side of the OR expression

Returns:

The newly created OrExpressionStateObject

parse

public void parse(java.lang.String jpqlFragment)

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

Parameters:

jpqlFragment - The portion of the query representing a conditional expression

setConditional

public void setConditional(StateObject conditionalStateObject)

Sets the given StateObject to be the conditional expression of this clause.

Parameters:

conditionalStateObject - The new StateObject representing the conditional expression

shouldEncapsulateORExpression

protected boolean shouldEncapsulateORExpression(StateObject stateObject)

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