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
   *
   *     https://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.avro;
  
  /**
   * <p>
   * A SchemaValidator has one method, which validates that a {@link Schema} is
   * <b>compatible<b/> with the other schemas provided.
   * </p>
   * <p>
   * What makes one Schema compatible with another is not part of the interface
   * contract.
   * </p>
   */
  public interface SchemaValidator {
  
    /**
     * Validate one schema against others. The order of the schemas to validate
     * against is chronological from most recent to oldest, if there is a natural
     * chronological order. This allows some validators to identify which schemas
     * are the most "recent" in order to validate only against the most recent
     * schema(s).
     *
     * @param toValidate The schema to validate
     * @param existing   The schemas to validate against, in order from most recent
     *                   to latest if applicable
     * @throws SchemaValidationException if the schema fails to validate.
     */
    void validate(Schema toValidate, Iterable<Schema> existing) throws SchemaValidationException;
  
  }
  