| /* |
| * 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 java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.eclipse.persistence.jpa.jpql.parser.AbstractFromClause; |
| import org.eclipse.persistence.jpa.jpql.tools.model.Problem; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IEntity; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IManagedType; |
| import org.eclipse.persistence.jpa.jpql.tools.utility.iterable.SnapshotCloneIterable; |
| import org.eclipse.persistence.jpa.jpql.utility.CollectionTools; |
| import org.eclipse.persistence.jpa.jpql.utility.iterable.ListIterable; |
| import static org.eclipse.persistence.jpa.jpql.ExpressionTools.*; |
| import static org.eclipse.persistence.jpa.jpql.parser.AbstractExpression.*; |
| |
| /** |
| * This state object represents the abstract definition of a <code><b>FROM</b></code> clause, which |
| * is either the <code>FROM</code> clause of the query or of a sub-query expression. |
| * |
| * @see AbstractSelectStatementStateObject |
| * @see FromClauseStateObject |
| * |
| * @see AbstractFromClause |
| * |
| * @version 2.5 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| @SuppressWarnings({"nls", "unused"}) // unused used for the import statement: see bug 330740 |
| public abstract class AbstractFromClauseStateObject extends AbstractListHolderStateObject<VariableDeclarationStateObject> |
| implements DeclarationStateObject { |
| |
| /** |
| * Notifies the content of the list of {@link VariableDeclarationStateObject} has changed. |
| */ |
| public static final String VARIABLE_DECLARATIONS_LIST = "variableDeclarations"; |
| |
| /** |
| * Creates a new <code>AbstractFromClauseStateObject</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> |
| */ |
| protected AbstractFromClauseStateObject(AbstractSelectStatementStateObject parent) { |
| super(parent); |
| } |
| |
| /** |
| * Adds a new collection declaration to the <code><b>FROM</b></code> clause. |
| * |
| * @return The {@link CollectionMemberDeclarationStateObject} representing the collection declaration |
| */ |
| public CollectionMemberDeclarationStateObject addCollectionDeclaration() { |
| CollectionMemberDeclarationStateObject stateObject = new CollectionMemberDeclarationStateObject(this); |
| addItem(stateObject); |
| return stateObject; |
| } |
| |
| /** |
| * Adds a new collection declaration to the <code><b>FROM</b></code> clause. |
| * |
| * @param collectionValuedPath The collection-valued path expression |
| * @param identificationVariable The variable defining the collection-valued path expression |
| * @return The {@link CollectionMemberDeclarationStateObject} representing the collection |
| * declaration |
| */ |
| public CollectionMemberDeclarationStateObject addCollectionDeclaration(String collectionValuedPath, |
| String identificationVariable) { |
| |
| CollectionMemberDeclarationStateObject stateObject = new CollectionMemberDeclarationStateObject(this); |
| stateObject.setPath(collectionValuedPath); |
| stateObject.setIdentificationVariable(identificationVariable); |
| |
| addItem(stateObject); |
| return stateObject; |
| } |
| |
| @Override |
| protected void addProblems(List<Problem> currentProblems) { |
| super.addProblems(currentProblems); |
| // TODO |
| } |
| |
| /** |
| * Adds a new range variable declaration to the <code><b>FROM</b></code> clause. |
| * |
| * @return The {@link StateObject} representing the range variable declaration |
| */ |
| public IdentificationVariableDeclarationStateObject addRangeDeclaration() { |
| IdentificationVariableDeclarationStateObject stateObject = new IdentificationVariableDeclarationStateObject(this); |
| addItem(stateObject); |
| return stateObject; |
| } |
| |
| /** |
| * Adds to this select statement a new range variable declaration. |
| * |
| * @param entity The external form of the entity to add to the declaration list |
| * @param identificationVariable The unique identifier identifying the abstract schema name |
| * @return The state object of the new declaration |
| */ |
| public IdentificationVariableDeclarationStateObject addRangeDeclaration(IEntity entity, |
| String identificationVariable) { |
| |
| IdentificationVariableDeclarationStateObject stateObject = new IdentificationVariableDeclarationStateObject( |
| this, |
| entity, |
| identificationVariable |
| ); |
| |
| addItem(stateObject); |
| return stateObject; |
| } |
| |
| /** |
| * Adds a new range variable declaration. |
| * |
| * @param entityName The name of the entity name |
| * @param identificationVariable The new identification variable |
| * @return The state object of the new declaration |
| */ |
| public IdentificationVariableDeclarationStateObject addRangeDeclaration(String entityName, |
| String identificationVariable) { |
| |
| IdentificationVariableDeclarationStateObject stateObject = new IdentificationVariableDeclarationStateObject( |
| this, |
| entityName, |
| identificationVariable |
| ); |
| |
| addItem(stateObject); |
| return stateObject; |
| } |
| |
| /** |
| * Returns the BNF of the declaration part of this clause. |
| * |
| * @return The BNF of the declaration part of this clause |
| */ |
| protected abstract String declarationBNF(); |
| |
| @Override |
| public ListIterable<? extends VariableDeclarationStateObject> declarations() { |
| return items(); |
| } |
| |
| @Override |
| public IdentificationVariableStateObject findIdentificationVariable(String variable) { |
| |
| for (IdentificationVariableStateObject identificationVariable : identificationVariables()) { |
| if (stringsAreEqualIgnoreCase(identificationVariable.getText(), variable)) { |
| return identificationVariable; |
| } |
| } |
| |
| return null; |
| } |
| |
| @Override |
| public DeclarationStateObject getDeclaration() { |
| return this; |
| } |
| |
| @Override |
| public AbstractFromClause getExpression() { |
| return (AbstractFromClause) super.getExpression(); |
| } |
| |
| @Override |
| public IManagedType getManagedType(StateObject stateObject) { |
| |
| for (VariableDeclarationStateObject declaration : declarations()) { |
| |
| IManagedType managedType = declaration.getManagedType(stateObject); |
| |
| if (managedType != null) { |
| return managedType; |
| } |
| } |
| |
| return null; |
| } |
| |
| @Override |
| public AbstractSelectStatementStateObject getParent() { |
| return (AbstractSelectStatementStateObject) super.getParent(); |
| } |
| |
| /** |
| * Returns the {@link IdentificationVariableStateObject IdentificationVariableStateObjects} |
| * holding onto the identification variables, which are the variables defined in the |
| * <code><b>FROM</b></code> clause. |
| * <p> |
| * Example: |
| * <ul> |
| * <li><code>Employee e</code>; <i>e</i> is returned</li> |
| * <li><code>IN (e.employees) AS emps</code>; <i>emps</i> is returned</li> |
| * <li><code>Manager m JOIN m.employees emps</code>; <i>m</i> and <i>emps</i> are returned</li> |
| * </ul> |
| * |
| * @return The list of {@link IdentificationVariableStateObject IdentificationVariableStateObjects} |
| */ |
| public Iterable<IdentificationVariableStateObject> identificationVariables() { |
| |
| List<IdentificationVariableStateObject> stateObjects = new ArrayList<IdentificationVariableStateObject>(); |
| |
| for (VariableDeclarationStateObject stateObject : items()) { |
| CollectionTools.addAll(stateObjects, stateObject.identificationVariables()); |
| } |
| |
| return new SnapshotCloneIterable<IdentificationVariableStateObject>(stateObjects); |
| } |
| |
| @Override |
| public boolean isEquivalent(StateObject stateObject) { |
| return super.isEquivalent(stateObject) && |
| areChildrenEquivalent((AbstractListHolderStateObject<?>) stateObject); |
| } |
| |
| @Override |
| protected String listName() { |
| return VARIABLE_DECLARATIONS_LIST; |
| } |
| |
| /** |
| * 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 parse(String jpqlFragment) { |
| // No need to add the items, they are automatically added by the builder |
| buildStateObjects(jpqlFragment, declarationBNF()); |
| } |
| |
| @Override |
| protected void toTextInternal(Appendable writer) throws IOException { |
| writer.append(FROM); |
| writer.append(SPACE); |
| toStringItems(writer, true); |
| } |
| } |