Package org.eclipse.persistence.internal.jpa.parsing

Class PlusNode

java.lang.Object

org.eclipse.persistence.internal.jpa.parsing.Node

org.eclipse.persistence.internal.jpa.parsing.BinaryOperatorNode

org.eclipse.persistence.internal.jpa.parsing.PlusNode

All Implemented Interfaces:

AliasableNode

public class PlusNode
extends BinaryOperatorNode
implements AliasableNode

INTERNAL

Purpose: Represent a '+' in EJBQL

Responsibilities:

• Generate the correct expression for a '+'

Since:

July 2003

Author:

Jon Driscoll and Joel Lucuik

Field Summary

Fields inherited from class org.eclipse.persistence.internal.jpa.parsing.Node

alias, left, right, shouldGenerateExpression

Constructor Summary

Constructors

Constructor	Description
PlusNode()

Method Summary

Modifier and Type	Method	Description
void	applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context)	INTERNAL Apply this node to the passed query
Expression	generateExpression(GenerationContext context)	INTERNAL Generate the expression.
boolean	isAliasableNode()
boolean	isPlusNode()	INTERNAL Is this node a Plus node
void	validate(ParseTreeContext context)	INTERNAL Validate node and calculates its type.

Methods inherited from class org.eclipse.persistence.internal.jpa.parsing.Node

addToExpression, appendExpression, getAlias, getAsString, getColumn, getLeft, getLine, getRight, getType, hasLeft, hasRight, isAggregateNode, isAttributeNode, isConstructorNode, isCountNode, isDivideNode, isDotNode, isEscape, isLiteralNode, isMapKeyNode, isMinusNode, isMultiplyNode, isNotNode, isParameterNode, isSubqueryNode, isVariableNode, qualifyAttributeAccess, resolveAttribute, resolveClass, resolveClass, resolveMapping, resolveMapping, setAlias, setColumn, setLeft, setLine, setRight, setType, toString, toString, toStringDisplayName, toStringIndent, validateParameter

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.eclipse.persistence.internal.jpa.parsing.AliasableNode

getAlias, setAlias

Constructor Detail

PlusNode

public PlusNode()

Method Detail

applyToQuery

public void applyToQuery(ObjectLevelReadQuery theQuery,
                         GenerationContext context)

INTERNAL Apply this node to the passed query

Overrides:

applyToQuery in class Node

validate

public void validate(ParseTreeContext context)

INTERNAL Validate node and calculates its type.

Overrides:

validate in class BinaryOperatorNode

generateExpression

public Expression generateExpression(GenerationContext context)

INTERNAL Generate the expression. The steps are: 1. Generate the expression for the left node 2. Add the .plus to the where clause returned from step 1 3. Generate the expression for the right side and use it as the parameter for the .plus() 4. Return the completed where clause to the caller

Overrides:

generateExpression in class Node

isPlusNode

public boolean isPlusNode()

Description copied from class: Node

INTERNAL Is this node a Plus node

Overrides:

isPlusNode in class Node

isAliasableNode

public boolean isAliasableNode()

Overrides:

isAliasableNode in class Node