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 org.apache.beam.sdk.schemas.annotations;
  
  import java.lang.annotation.Documented;
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  import javax.annotation.Nonnull;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.CaseFormat;
  
  /**
   * When used on a {@link org.apache.beam.sdk.schemas.JavaFieldSchema POJO}, {@link
   * org.apache.beam.sdk.schemas.JavaBeanSchema Java Bean}, or {@link
   * org.apache.beam.sdk.schemas.AutoValueSchema AutoValue} class the specified case format will be
   * used for all the generated Schema fields.
   *
   * <p>The annotation can also be used on individual POJO fields, and Java Bean and AutoValue getters
   * to change the case format just for those fields.
   *
   * <p>For example, say we have a POJO with fields that we want in our schema but under names with a
   * different case format:
   *
   * <pre><code>
   * {@literal @}DefaultSchema(JavaFieldSchema.class)
   * {@literal @}SchemaCaseFormat(CaseFormat.LOWER_UNDERSCORE)
   *   class MyClass {
   *     public String user;
   *     public int ageInYears;
   *    {@literal @}SchemaCaseFormat(CaseFormat.UPPER_CAMEL)
   *     public boolean knowsJavascript;
   *   }
   * </code></pre>
   *
   * <p>The resulting schema will have fields named "user", "age_in_years", "KnowsJavascript".
   *
   * <p>A common application of this annotation is to make schema fields use the {@code
   * lower_underscore} case format, which is recommended for schemas that will be used across language
   * boundaries.
   *
   * <p><b>NOTE:</b> This annotation assumes that field and method names follow the convention of
   * using the {@code lowerCamel} case format. If that is not the case, we make a best effort to
   * convert the field name but the result is not well defined.
   */
  @Documented
  @Retention(RetentionPolicy.RUNTIME)
  @Target({ElementType.FIELD, ElementType.METHOD, ElementType.TYPE})
  @SuppressWarnings("rawtypes")
  public @interface SchemaCaseFormat {
  
    /** The name to use for the generated schema field. */
    @Nonnull
    CaseFormat value();
  }
  