| /* |
| * Copyright (c) 2011, 2021 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: |
| // 03/08/2010 Andrei Ilitchev |
| // Bug 300512 - Add FUNCTION support to extended JPQL |
| package org.eclipse.persistence.internal.jpa.parsing; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.persistence.expressions.Expression; |
| |
| /** |
| * INTERNAL |
| * <p><b>Purpose</b>: |
| * <p><b>Responsibilities</b>:<ul> |
| * <li> Generate expression for custom functions |
| * Example: "SELECT FUNC('NVL', e.firstName, 'NoFirstName') FROM Employee e" |
| * </ul> |
| * @author Andrei Ilitchev |
| * @since Eclipselink 2.1 |
| */ |
| public class FuncNode extends FunctionalExpressionNode { |
| |
| private String name; |
| private List<Node> parameters; |
| |
| protected FuncNode() { |
| super(); |
| } |
| |
| public void setName(String name) { |
| this.name = name; |
| } |
| |
| public String getName() { |
| return this.name; |
| } |
| |
| public void setParameters(List<Node> parameters) { |
| this.parameters = parameters; |
| } |
| |
| public List<Node> getParameters() { |
| return this.parameters; |
| } |
| |
| @Override |
| public void validate(ParseTreeContext context) { |
| for(Node parameter : this.parameters) { |
| parameter.validate(context); |
| } |
| } |
| |
| /** |
| * INTERNAL |
| * Generate the EclipseLink expression for this node |
| */ |
| @Override |
| public Expression generateExpression(GenerationContext context) { |
| int size = this.parameters.size(); |
| if(size == 0) { |
| return context.getBaseExpression().getFunction(this.name); |
| } |
| |
| List<Expression> vExpressions = new ArrayList<>(size - 1); |
| Expression base = this.parameters.get(0).generateExpression(context); |
| for(int i=1; i < size; i++) { |
| Expression child = this.parameters.get(i).generateExpression(context); |
| vExpressions.add(child); |
| } |
| return base.getFunctionWithArguments(this.name, vExpressions); |
| } |
| } |