oracle.toplink.essentials.internal.parsing.MemberOfNode Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.parsing;
/**
* INTERNAL
* Purpose: Represent the MEMBER-OF operator
*
Responsibilities:
* - MEMBER OF is not supported.
*
* @author Jon Driscoll and Joel Lucuik
* @since since July 2003
*/
import oracle.toplink.essentials.expressions.*;
public class MemberOfNode extends BinaryOperatorNode {
private boolean notIndicated = false;
//If we're dealing with a NOT, we store the expression for the left.
//When we get to the one-to-many on the right, it will handle the noneOf using
//the receiver stored in the context.
//(i.e. secondLastRightExpression.noneOf(lastRightVariable, leftExpression)
private Expression leftExpression = null;
/**
* Return a new MemberOfNode
*/
public MemberOfNode() {
super();
}
/**
* INTERNAL makeNodeOneToMany:
* Traverse to the leaf on theNode and mark as one to many
*/
public void makeNodeOneToMany(Node theNode) {
Node currentNode = theNode;
do {
if (!currentNode.hasRight()) {
((AttributeNode)currentNode).setRequiresCollectionAttribute(true);
return;
}
currentNode = currentNode.getRight();
} while (true);
}
/**
* INTERNAL
* Validate node and calculates its type.
*/
public void validate(ParseTreeContext context) {
super.validate(context);
Node left = getLeft();
if (left.isVariableNode() && ((VariableNode)left).isAlias(context)) {
context.usedVariable(((VariableNode)left).getCanonicalVariableName());
}
left.validateParameter(context, right.getType());
TypeHelper typeHelper = context.getTypeHelper();
setType(typeHelper.getBooleanType());
}
public Expression generateExpression(GenerationContext context) {
// Need to make sure one of the node is marked as a one to many
if (getRight().isParameterNode()) {
makeNodeOneToMany(getLeft());
} else {
makeNodeOneToMany(getRight());
}
//Handle NOT. Store the expression for the left, let VariableNode handle it.
if (notIndicated()) {
Expression resultFromRight = null;
context.setMemberOfNode(this);
this.setLeftExpression(getLeft().generateExpression(context));
resultFromRight = getRight().generateExpression(context);
//clean up
context.setMemberOfNode(null);
this.setLeftExpression(null);
return resultFromRight;
} else {
//otherwise, handle like normal anyOf()
return getRight().generateExpression(context).equal(getLeft().generateExpression(context));
}
}
/**
* INTERNAL
* Indicate if a NOT was found in the WHERE clause.
* Examples:
* ...WHERE ... NOT MEMBER OF
*/
public void indicateNot() {
notIndicated = true;
}
public boolean notIndicated() {
return notIndicated;
}
//set and get the leftExpression. This is for NOT MEMBER OF.
public void setLeftExpression(Expression newLeftExpression) {
leftExpression = newLeftExpression;
}
public Expression getLeftExpression() {
return leftExpression;
}
}