oracle.toplink.essentials.internal.parsing.SubstringNode Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.expressions.*;
/**
* INTERNAL
* Purpose: Represent a SUBSTRING
*
Responsibilities:
* - Generate the correct expression for SUBSTRING
*
* @author Jon Driscoll and Joel Lucuik
* @since TopLink 4.0
*/
public class SubstringNode extends StringFunctionNode {
private Node startPosition = null;
private Node stringLength = null;
/**
* SubstringNode constructor comment.
*/
public SubstringNode() {
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 (left != null) {
left = left.qualifyAttributeAccess(context);
}
if (startPosition != null) {
startPosition = startPosition.qualifyAttributeAccess(context);
}
if (stringLength != null) {
stringLength = stringLength.qualifyAttributeAccess(context);
}
return this;
}
/**
* INTERNAL
* Validate node and calculate its type.
*/
public void validate(ParseTreeContext context) {
TypeHelper typeHelper = context.getTypeHelper();
if (left != null) {
left.validate(context);
left.validateParameter(context, typeHelper.getStringType());
}
if (startPosition != null) {
startPosition.validate(context);
startPosition.validateParameter(context, typeHelper.getIntType());
}
if (stringLength != null) {
stringLength.validate(context);
stringLength.validateParameter(context, typeHelper.getIntType());
}
setType(typeHelper.getStringType());
}
/**
* INTERNAL
* Generate the TopLink expression for this node
*/
public Expression generateExpression(GenerationContext context) {
Expression whereClause = getLeft().generateExpression(context);
Expression startPosition = getStartPosition().generateExpression(context);
Expression stringLength = getStringLength().generateExpression(context);
whereClause = whereClause.substring(startPosition, stringLength);
return whereClause;
}
/**
* Return the start position object
*/
private Node getStartPosition() {
return startPosition;
}
/**
* Return the string length object
*/
private Node getStringLength() {
return stringLength;
}
/**
* Insert the method's description here.
* Creation date: (1/19/01 3:41:55 PM)
* @param newStartPosition java.lang.Integer
*/
public void setStartPosition(Node newStartPosition) {
startPosition = newStartPosition;
}
/**
* Insert the method's description here.
* Creation date: (1/19/01 3:42:26 PM)
* @param newStringLength java.lang.Integer
*/
public void setStringLength(Node newStringLength) {
stringLength = newStringLength;
}
}