| /* |
| * 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.StateFieldPathExpression; |
| import org.eclipse.persistence.jpa.jpql.tools.TypeHelper; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IManagedType; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IManagedTypeProvider; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IManagedTypeVisitor; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IMapping; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IType; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.ITypeDeclaration; |
| import org.eclipse.persistence.jpa.jpql.tools.utility.iterable.EmptyIterable; |
| |
| /** |
| * A single-valued association field is designated by the name of an association-field in a |
| * one-to-one or many-to-one relationship. The type of a single-valued association field and thus a |
| * single-valued association path expression is the abstract schema type of the related entity. |
| * |
| * <div><p><b>BNF:</b> <code>state_field_path_expression ::= {identification_variable | single_valued_association_path_expression}.state_field</code></p></div> |
| * |
| * <div><p><b>BNF:</b> <code>single_valued_association_path_expression ::= identification_variable.{single_valued_association_field.}*single_valued_association_field</code></p></div> |
| * |
| * @see StateFieldPathExpression |
| * |
| * @version 2.5 |
| * @since 2.4 |
| * @author Pascal Filion |
| */ |
| public class StateFieldPathExpressionStateObject extends AbstractPathExpressionStateObject { |
| |
| /** |
| * Creates a new <code>StateFieldPathExpressionStateObject</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 StateFieldPathExpressionStateObject(StateObject parent) { |
| super(parent); |
| } |
| |
| /** |
| * Creates a new <code>StateFieldPathExpressionStateObject</code>. |
| * |
| * @param parent The parent of this state object, which cannot be <code>null</code> |
| * @param path The state field path expression |
| * @exception NullPointerException The given parent cannot be <code>null</code> |
| */ |
| public StateFieldPathExpressionStateObject(StateObject parent, String path) { |
| super(parent, path); |
| } |
| |
| @Override |
| public void accept(StateObjectVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| public StateFieldPathExpression getExpression() { |
| return (StateFieldPathExpression) super.getExpression(); |
| } |
| |
| @Override |
| protected IManagedType resolveManagedType() { |
| |
| IMapping mapping = getMapping(); |
| |
| if (mapping == null) { |
| return null; |
| } |
| |
| TypeHelper typeHelper = getTypeHelper(); |
| ITypeDeclaration typeDeclaration = mapping.getTypeDeclaration(); |
| IType type = typeDeclaration.getType(); |
| |
| // Collection type cannot be traversed |
| if (typeHelper.isCollectionType(type)) { |
| |
| ITypeDeclaration[] typeParameters = typeDeclaration.getTypeParameters(); |
| |
| if (typeParameters.length == 0) { |
| return null; |
| } |
| |
| type = typeParameters[0].getType(); |
| } |
| // Wrap the Map into a virtual IManagedType so it can be returned and the |
| // IType for the Map can be used to retrieve the type of the key and value |
| else if (typeHelper.isMapType(type)) { |
| return new MapManagedType(getManagedTypeProvider(), type); |
| } |
| |
| // Retrieve the corresponding managed type for the mapping's type |
| return getManagedTypeProvider().getManagedType(type); |
| } |
| |
| @Override |
| protected IType resolveType() { |
| return getTypeHelper().convertPrimitive(getTypeDeclaration().getType()); |
| } |
| |
| /** |
| * Keeps a reference of the {@link StateFieldPathExpression 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 StateFieldPathExpression parsed object} representing a state |
| * field path expression |
| */ |
| public void setExpression(StateFieldPathExpression expression) { |
| super.setExpression(expression); |
| } |
| |
| protected static class MapManagedType implements IManagedType { |
| |
| protected final IType mapType; |
| protected final IManagedTypeProvider provider; |
| |
| protected MapManagedType(IManagedTypeProvider provider, IType mapType) { |
| super(); |
| this.mapType = mapType; |
| this.provider = provider; |
| } |
| |
| @Override |
| public void accept(IManagedTypeVisitor visitor) { |
| } |
| |
| @Override |
| public int compareTo(IManagedType managedType) { |
| return getType().getName().compareTo(managedType.getType().getName()); |
| } |
| |
| @Override |
| public IMapping getMappingNamed(String name) { |
| return null; |
| } |
| |
| @Override |
| public IManagedTypeProvider getProvider() { |
| return provider; |
| } |
| |
| @Override |
| public IType getType() { |
| return mapType; |
| } |
| |
| @Override |
| public Iterable<IMapping> mappings() { |
| return EmptyIterable.instance(); |
| } |
| |
| @Override |
| public String toString() { |
| return getType().getName(); |
| } |
| } |
| } |