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package oracle.toplink.essentials.internal.parsing;

import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.exceptions.EJBQLException;

/**
 * INTERNAL
 * 

Purpose: Represent an '=' in EJBQL *

Responsibilities:

    *
  • Generate the correct expression for an '=' in EJBQL *
* @author Jon Driscoll and Joel Lucuik * @since TopLink 4.0 */ public class EqualsNode extends BinaryOperatorNode { /** * EqualsNode constructor comment. */ public EqualsNode() { super(); } /** * INTERNAL * Validate node and calculates its type. */ public void validate(ParseTreeContext context) { super.validate(context); TypeHelper typeHelper = context.getTypeHelper(); Object leftType = left.getType(); Object rightType = right.getType(); if (typeHelper.isEnumType(leftType) && !typeHelper.isEnumType(rightType)) { throw EJBQLException.invalidEnumEqualExpression( context.getQueryInfo(), getLine(), getColumn(), typeHelper.getTypeName(leftType), typeHelper.getTypeName(rightType)); } else if (typeHelper.isEnumType(rightType) && !typeHelper.isEnumType(leftType)) { throw EJBQLException.invalidEnumEqualExpression( context.getQueryInfo(), getLine(), getColumn(), typeHelper.getTypeName(rightType), typeHelper.getTypeName(leftType)); } setType(typeHelper.getBooleanType()); } /** * Resolve the expression. The steps are: * 1. Set the expressionBuilder for the left and right nodes * 2. Generate the expression for the left node * 3. Add the .equals to the where clause returned from step 2 * 4. Generate the expression for the right side and use it as the parameter for the .equals() * 5. Return the completed where clause to the caller */ public Expression generateExpression(GenerationContext context) { Expression whereClause = getLeft().generateExpression(context); whereClause = whereClause.equal(getRight().generateExpression(context)); return whereClause; } /** * INTERNAL * Get the string representation of this node. */ public String getAsString() { return left.getAsString() + " = " + right.getAsString(); } }




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