| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package javax.jdo.annotations; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Repeatable; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| |
| /** |
| * Annotation for a database unique constraint. Used for database schema |
| * generation to create unique constraints. Also used to reorder database |
| * operations when flushing changes to avoid unique constraint violations. |
| * Corresponds to the xml element "unique". |
| * |
| * @version 3.2 |
| * @since 2.1 |
| */ |
| @Target({ElementType.TYPE, ElementType.FIELD, ElementType.METHOD}) |
| @Retention(RetentionPolicy.RUNTIME) |
| @Repeatable(Uniques.class) |
| public @interface Unique |
| { |
| /** Name of the unique constraint. |
| * @return the name of the unique constraint |
| */ |
| String name() default ""; |
| |
| /** Table for the unique constraint. This is needed iff annotating a type |
| * where this unique constraint is not for the primary table for |
| * the persistent class or interface. |
| * @return the table on which the unique constraint is defined |
| */ |
| String table() default ""; |
| |
| /** Whether this unique constraint is deferred until commit. |
| * @return whether this unique constraint is deferred until commit |
| */ |
| String deferred() default ""; |
| |
| /** Member (field and property) names that compose this unique constraint. |
| * @return member names that compose this unique constraint |
| */ |
| String[] members() default {}; |
| |
| /** Columns that compose this unique constraint. |
| * @return columns that compose this unique constraint |
| */ |
| Column[] columns() default {}; |
| |
| /** Vendor extensions. |
| * @return the vendor extensions |
| */ |
| Extension[] extensions() default {}; |
| } |