| /* |
| * 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: |
| // Oracle - initial API and implementation |
| // |
| package org.eclipse.persistence.jpa.jpql.tools.model.query; |
| |
| import org.eclipse.persistence.jpa.jpql.parser.SimpleSelectStatement; |
| import org.eclipse.persistence.jpa.jpql.tools.model.ISimpleSelectExpressionStateObjectBuilder; |
| |
| /** |
| * This state object represents a subquery, which has at least a <code><b>SELECT</b></code> clause |
| * and a <code><b>FROM</b></code> clause. The other clauses are optional. |
| * <p> |
| * <b>BNF:</b> <code>subquery ::= simple_select_clause subquery_from_clause [where_clause] [groupby_clause] [having_clause]</code><p> |
| * |
| * @see SimpleSelectStatement |
| * |
| * @version 2.4 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| public class SimpleSelectStatementStateObject extends AbstractSelectStatementStateObject { |
| |
| /** |
| * Creates a new <code>SimpleSelectStatementStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| public SimpleSelectStatementStateObject(StateObject parent) { |
| super(parent); |
| } |
| |
| @Override |
| public void accept(StateObjectVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| /** |
| * Adds a new derived collection declaration to the <code><b>FROM</b></code> clause. |
| * |
| * @return The {@link CollectionMemberDeclarationStateObject} representing the collection |
| * declaration |
| */ |
| public CollectionMemberDeclarationStateObject addDerivedCollectionDeclaration() { |
| return getFromClause().addDerivedCollectionDeclaration(); |
| } |
| |
| /** |
| * Adds a new derived collection declaration to the <code><b>FROM</b></code> clause. |
| * |
| * @param collectionValuedPath The collection-valued path expression |
| * @return The {@link CollectionMemberDeclarationStateObject} representing the collection |
| * declaration |
| */ |
| public CollectionMemberDeclarationStateObject addDerivedCollectionDeclaration(String collectionValuedPath) { |
| return getFromClause().addDerivedCollectionDeclaration(collectionValuedPath); |
| } |
| |
| /** |
| * Adds a new derived identification variable declaration to the <code><b>FROM</b></code> clause. |
| * |
| * @return The {@link DerivedPathIdentificationVariableDeclarationStateObject} representing the collection |
| * declaration |
| */ |
| public DerivedPathIdentificationVariableDeclarationStateObject addDerivedPathDeclaration() { |
| return getFromClause().addDerivedPathDeclaration(); |
| } |
| |
| /** |
| * Adds a new derived identification variable declaration to the <code><b>FROM</b></code> clause. |
| * |
| * @param path Either the derived singled-valued object field or the collection-valued path expression |
| * @param identificationVariable The identification variable defining the given path |
| * @return The {@link DerivedPathIdentificationVariableDeclarationStateObject} representing the |
| * path declaration |
| */ |
| public DerivedPathIdentificationVariableDeclarationStateObject addDerivedPathDeclaration(String path, |
| String identificationVariable) { |
| |
| return getFromClause().addDerivedPathDeclaration(path, identificationVariable); |
| } |
| |
| @Override |
| protected AbstractFromClauseStateObject buildFromClause() { |
| return new SimpleFromClauseStateObject(this); |
| } |
| |
| @Override |
| protected AbstractSelectClauseStateObject buildSelectClause() { |
| return new SimpleSelectClauseStateObject(this); |
| } |
| |
| @Override |
| public SimpleSelectStatement getExpression() { |
| return (SimpleSelectStatement) super.getExpression(); |
| } |
| |
| @Override |
| public SimpleFromClauseStateObject getFromClause() { |
| return (SimpleFromClauseStateObject) super.getFromClause(); |
| } |
| |
| /** |
| * Creates and returns a new {@link ISimpleSelectExpressionStateObjectBuilder} that can be used |
| * to programmatically create a single select expression and once the expression is complete, |
| * {@link ISimpleSelectExpressionStateObjectBuilder#commit()} will push the {@link StateObject} |
| * representation of that expression as this clause's select expression. |
| * |
| * @return A new builder that can be used to quickly create a select expression |
| */ |
| public ISimpleSelectExpressionStateObjectBuilder getSelectBuilder() { |
| return getSelectClause().getBuilder(); |
| } |
| |
| @Override |
| public SimpleSelectClauseStateObject getSelectClause() { |
| return (SimpleSelectClauseStateObject) super.getSelectClause(); |
| } |
| |
| /** |
| * Keeps a reference of the {@link SimpleSelectStatement parsed object} object, which should only |
| * be done when this object is instantiated during the conversion of a parsed JPQL query into |
| * {@link StateObject StateObjects}. |
| * |
| * @param expression The {@link SimpleSelectStatement parsed object} representing a subquery |
| * <code><b>SELECT</b></code> statement |
| */ |
| public void setExpression(SimpleSelectStatement expression) { |
| super.setExpression(expression); |
| } |
| |
| /** |
| * Sets the given {@link StateObject} as the <code><b>SELECT</b></code> clause's select item. |
| * |
| * @param stateObject The {@link StateObject} representing the single select item |
| */ |
| public void setSelectItem(StateObject stateObject) { |
| getSelectClause().setSelectItem(stateObject); |
| } |
| |
| /** |
| * Parses the given JPQL fragment and create the select item. For the top-level query, the |
| * fragment can contain several select items but for a subquery, it can represent only one. |
| * |
| * @param jpqlFragment The portion of the query representing one or several select items |
| */ |
| public void setSelectItem(String jpqlFragment) { |
| getSelectClause().parse(jpqlFragment); |
| } |
| } |