oracle.toplink.essentials.internal.parsing.LikeNode Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.expressions.*;
/**
* INTERNAL
* Purpose: Represent a LIKE in EJBQL
*
Responsibilities:
* - Generate the correct expression for a LIKE
*
* @author Jon Driscoll and Joel Lucuik
* @since TopLink 4.0
*/
public class LikeNode extends SimpleConditionalExpressionNode {
private EscapeNode escape = null;
/**
* LikeNode constructor comment.
*/
public LikeNode() {
super();
}
/**
* INTERNAL
* Validate the current node and calculates its type.
*/
public void validate(ParseTreeContext context) {
TypeHelper typeHelper = context.getTypeHelper();
if (left != null) {
left.validate(context);
left.validateParameter(context, typeHelper.getStringType());
}
if (right != null) {
right.validate(context);
right.validateParameter(context, typeHelper.getStringType());
}
if (escape != null) {
escape.validate(context);
}
setType(typeHelper.getBooleanType());
}
/**
* INTERNAL
* Return a TopLink expression for this node.
*/
public Expression generateExpression(GenerationContext context) {
Expression whereClause = getLeft().generateExpression(context);
if (!hasEscape()) {
whereClause = whereClause.like(getRight().generateExpression(context));
} else {
whereClause = whereClause.like(getRight().generateExpression(context), getEscapeNode().generateExpression(context));
}
return whereClause;
}
public boolean hasEscape() {
return getEscapeNode() != null;
}
// Accessors
public EscapeNode getEscapeNode() {
return escape;
}
public void setEscapeNode(EscapeNode node) {
escape = node;
}
}