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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  package javax.jdo.annotations;
    18
    19  import java.lang.annotation.ElementType;
    20  import java.lang.annotation.Retention;
    21  import java.lang.annotation.RetentionPolicy;
    22  import java.lang.annotation.Target;
    23
    24  /**
    25   * Annotation for a JDO vendor extension.
    26   * Corresponds to the xml element "extension".
    27   *
    28   * @version 2.1
    29   * @since 2.1
    30   */
    31  @Target({ElementType.TYPE, ElementType.FIELD, ElementType.METHOD})
    32  @Retention(RetentionPolicy.RUNTIME)
    33  public @interface Extension
    34  {
    35      /** Vendor that the extension applies to (required).
    36       * @return the vendor
    37       */
    38      String vendorName();
    39
    40      /** The key for the extension (required).
    41       * @return the key
    42       */
    43      String key();
    44
    45      /** The value for the extension (required).
    46       * @return the value
    47       */
    48      String value();
    49  }