oracle.toplink.essentials.internal.parsing

Class EqualsNode

java.lang.Object

oracle.toplink.essentials.internal.parsing.Node

oracle.toplink.essentials.internal.parsing.BinaryOperatorNode

oracle.toplink.essentials.internal.parsing.EqualsNode

public class EqualsNode
extends BinaryOperatorNode

INTERNAL

Purpose: Represent an '=' in EJBQL

Responsibilities:

• Generate the correct expression for an '=' in EJBQL

Since:

TopLink 4.0

Author:

Jon Driscoll and Joel Lucuik

Field Summary

Fields inherited from class oracle.toplink.essentials.internal.parsing.Node

left, right, shouldGenerateExpression

Constructor Summary

Constructors

Constructor and Description
EqualsNode() EqualsNode constructor comment.

Method Summary

Modifier and Type	Method and Description
Expression	generateExpression(GenerationContext context) Resolve the expression.
String	getAsString() INTERNAL Get the string representation of this node.
void	validate(ParseTreeContext context) INTERNAL Validate node and calculates its type.

Methods inherited from class oracle.toplink.essentials.internal.parsing.Node

addToExpression, appendExpression, applyToQuery, getColumn, getLeft, getLine, getRight, getType, hasLeft, hasRight, isAggregateNode, isAttributeNode, isConstructorNode, isCountNode, isDivideNode, isDotNode, isEscape, isLiteralNode, isMinusNode, isMultiplyNode, isNotNode, isParameterNode, isPlusNode, isSubqueryNode, isVariableNode, qualifyAttributeAccess, resolveAttribute, resolveClass, resolveClass, resolveMapping, resolveMapping, 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

Constructor Detail

EqualsNode

public EqualsNode()

EqualsNode constructor comment.

Method Detail

validate

public void validate(ParseTreeContext context)

INTERNAL Validate node and calculates its type.

Overrides:

validate in class BinaryOperatorNode

generateExpression

public Expression generateExpression(GenerationContext context)

Resolve the expression. The steps are: 1. Set the expressionBuilder for the left and right nodes 2. Generate the expression for the left node 3. Add the .equals to the where clause returned from step 2 4. Generate the expression for the right side and use it as the parameter for the .equals() 5. Return the completed where clause to the caller

Overrides:

generateExpression in class Node

getAsString

public String getAsString()

INTERNAL Get the string representation of this node.

Overrides:

getAsString in class Node