content: /*
   * 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 com.datastax.oss.driver.api.mapper.annotations;
  
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  
  /**
   * Annotates the field or getter of an {@link Entity} property, to indicate that when retrieving
   * data that the property should be set to the result of computation on the Cassandra side,
   * typically a function call.
   *
   * <p>Example:
   *
   * <pre>
   * &#64;Computed("writetime(v)")
   * private int writeTime;
   * </pre>
   */
  @Target({ElementType.FIELD, ElementType.METHOD})
  @Retention(RetentionPolicy.RUNTIME)
  public @interface Computed {
  
    /**
     * The formula used to compute the property.
     *
     * <p>This is a CQL expression like you would use directly in a query, for instance {@code
     * writetime(v)}.
     *
     * @return the formula.
     */
    String value();
  }
  