| /* |
| * Copyright (c) 2006, 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 java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import org.eclipse.persistence.jpa.jpql.tools.NumericTypeComparator; |
| import org.eclipse.persistence.jpa.jpql.tools.TypeHelper; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.IType; |
| import org.eclipse.persistence.jpa.jpql.tools.spi.ITypeDeclaration; |
| |
| /** |
| * This {@link Resolver} is responsible to return the numeric type for a list of {@link Resolver |
| * Resolvers}. |
| * <p> |
| * The result of a <b>CASE</b> expression, <b>COALESCE</b> expression, <b>NULLIF</b> expression, or |
| * arithmetic expression (+, -, *, /) is determined by applying the following rule to its operands. |
| * </p> |
| * <ul> |
| * <li>If there is an operand of type <code>Double</code> or <code>double</code>, the result of the |
| * operation is of type <code>Double</code>; |
| * <li>otherwise, if there is an operand of type <code>Float</code> or <code>float</code>, the |
| * result of the operation is of type <code>Float</code>; |
| * <li>otherwise, if there is an operand of type <code>BigDecimal</code>, the result of the |
| * operation is of type <code>BigDecimal</code>; |
| * <li>otherwise, if there is an operand of type <code>BigInteger</code>, the result of the |
| * operation is of type <code>BigInteger</code>, unless the operator is / (division), in which |
| * case the numeric result type is not further defined; |
| * <li>otherwise, if there is an operand of type <code>Long</code> or <code>long</code>, the result |
| * of the operation is of type <code>Long</code>, unless the operator is / (division), in which |
| * case the numeric result type is not further defined; |
| * <li>otherwise, if there is an operand of integral type, the result of the operation is of type |
| * <code>Integer</code>, unless the operator is / (division), in which case the numeric result |
| * type is not further defined. |
| * </ul> |
| * |
| * @version 2.5 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public class NumericResolver extends Resolver { |
| |
| /** |
| * The {@link Resolver resolvers} used to calculate the numeric type. |
| */ |
| private final Collection<Resolver> resolvers; |
| |
| /** |
| * Creates a new <code>NumericResolver</code>. |
| * |
| * @param parent The parent {@link Resolver}, which is never <code>null</code> |
| * @param typeResolvers The {@link Resolver resolvers} used to calculate the numeric type |
| */ |
| public NumericResolver(Resolver parent, Collection<Resolver> typeResolvers) { |
| super(parent); |
| this.resolvers = typeResolvers; |
| } |
| |
| /** |
| * Creates a new <code>NumericResolver</code>. |
| * |
| * @param parent The parent {@link Resolver}, which is never <code>null</code> |
| * @param resolver The {@link Resolver} used to calculate the numeric type |
| */ |
| public NumericResolver(Resolver parent, Resolver resolver) { |
| this(parent, Collections.singleton(resolver)); |
| } |
| |
| @Override |
| protected IType buildType() { |
| |
| List<IType> types = new ArrayList<IType>(resolvers.size()); |
| TypeHelper helper = getTypeHelper(); |
| IType unresolvableType = helper.unknownType(); |
| |
| // Convert any primitive types into its Class type and any non-number into Object |
| for (Resolver typeResolver : resolvers) { |
| |
| IType type = typeResolver.getType(); |
| |
| // Only a resolvable type will be added to the list |
| if (type != unresolvableType) { |
| // Non-numeric type cannot be added |
| if (!helper.isNumericType(type)) { |
| type = helper.objectType(); |
| } |
| types.add(type); |
| } |
| } |
| |
| if (types.isEmpty()) { |
| return helper.unknownType(); |
| } |
| |
| // Comparing the types will result in putting the |
| // result at the beginning of the list |
| Collections.sort(types, new NumericTypeComparator(helper)); |
| |
| return types.get(0); |
| } |
| |
| @Override |
| protected ITypeDeclaration buildTypeDeclaration() { |
| return getType().getTypeDeclaration(); |
| } |
| } |