| /* |
| * Copyright (c) 2012, 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: |
| // Oracle - initial API and implementation |
| // |
| package org.eclipse.persistence.jpa.jpql.tools.resolver; |
| |
| import org.eclipse.persistence.jpa.jpql.ExpressionTools; |
| |
| /** |
| * This <code>DerivedDeclaration</code> represents an identification variable declaration that was |
| * declared in the <code><b>FROM</b></code> clause of a <code><b>SELECT</b></code> subquery. The |
| * "root" object is not an entity name but a derived path expression. |
| * |
| * @see org.eclipse.persistence.jpa.jpql.parser.IdentificationVariableDeclaration IdentificationVariableDeclaration |
| * |
| * @version 2.5 |
| * @since 2.5 |
| * @author Pascal Filion |
| */ |
| public class DerivedDeclaration extends AbstractRangeDeclaration { |
| |
| /** |
| * Creates a new <code>DerivedDeclaration</code>. |
| */ |
| public DerivedDeclaration() { |
| super(); |
| } |
| |
| /** |
| * If {@link org.eclipse.persistence.jpa.jpql.parser.CollectionMemberDeclaration#isDerived()} is |
| * <code>true</code>, then returns the identification variable used in the derived path expression |
| * that is defined in the superquery, otherwise returns an empty string. |
| * |
| * @return The identification variable from the superquery if the root path is a derived path |
| * expression |
| */ |
| public String getSuperqueryVariableName() { |
| int index = rootPath.indexOf('.'); |
| return (index > -1) ? rootPath.substring(0, index) : ExpressionTools.EMPTY_STRING; |
| } |
| |
| @Override |
| public Type getType() { |
| return Type.DERIVED; |
| } |
| } |