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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; } }




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