| /* |
| * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation from Oracle TopLink |
| package org.eclipse.persistence.internal.jpa.parsing; |
| |
| import org.eclipse.persistence.expressions.*; |
| import org.eclipse.persistence.exceptions.JPQLException; |
| |
| /** |
| * INTERNAL |
| * <p><b>Purpose</b>: Represent an '=' in EJBQL |
| * <p><b>Responsibilities</b>:<ul> |
| * <li> Generate the correct expression for an '=' in EJBQL |
| * </ul> |
| * @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. |
| */ |
| @Override |
| 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 JPQLException.invalidEnumEqualExpression( |
| context.getQueryInfo(), getLine(), getColumn(), |
| typeHelper.getTypeName(leftType), typeHelper.getTypeName(rightType)); |
| } else if (typeHelper.isEnumType(rightType) && !typeHelper.isEnumType(leftType)) { |
| throw JPQLException.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 |
| */ |
| @Override |
| 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. |
| */ |
| @Override |
| public String getAsString() { |
| return left.getAsString() + " = " + right.getAsString(); |
| } |
| } |