oracle.toplink.essentials.internal.parsing.LocateNode Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.expressions.*;
/**
* INTERNAL
* Purpose: Represent a LOCATE
*
Responsibilities:
* - Generate the correct expression for a LOCATE
*
* @author Jon Driscoll and Joel Lucuik
* @since TopLink 4.0
*/
public class LocateNode extends ArithmeticFunctionNode {
private Node find = null;
private Node findIn = null;
private Node startPosition = null;
/**
* Return a new LocateNode.
*/
public LocateNode() {
super();
}
/**
* INTERNAL
* Check the child nodes for an unqualified field access and if so,
* replace them by a qualified field access.
*/
public Node qualifyAttributeAccess(ParseTreeContext context) {
if (find != null) {
find = find.qualifyAttributeAccess(context);
}
if (findIn != null) {
findIn = findIn.qualifyAttributeAccess(context);
}
if (startPosition != null) {
startPosition = startPosition.qualifyAttributeAccess(context);
}
return this;
}
/**
* INTERNAL
* Validate node and calculate its type.
*/
public void validate(ParseTreeContext context) {
TypeHelper typeHelper = context.getTypeHelper();
if (findIn != null) {
findIn.validate(context);
findIn.validateParameter(context, typeHelper.getStringType());
}
if (find != null) {
find.validate(context);
find.validateParameter(context, typeHelper.getStringType());
}
if (startPosition != null) {
startPosition.validate(context);
startPosition.validateParameter(context, typeHelper.getIntType());
}
setType(typeHelper.getIntType());
}
/**
* INTERNAL
* Generate the TopLink expression for this node
*/
public Expression generateExpression(GenerationContext context) {
Expression whereClause = getFindIn().generateExpression(context);
Expression findExpr = getFind().generateExpression(context);
if (startPosition != null) {
whereClause = whereClause.locate(findExpr, getStartPosition().generateExpression(context));
} else {
whereClause = whereClause.locate(findExpr);
}
return whereClause;
}
// Accessors
public Node getFind() {
return find;
}
public Node getFindIn() {
return findIn;
}
public void setFind(Node newFind) {
find = newFind;
}
public void setFindIn(Node newFindIn) {
findIn = newFindIn;
}
public Node getStartPosition() {
return startPosition;
}
public void setStartPosition(Node newStartPosition) {
startPosition = newStartPosition;
}
}