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;
  
  import java.util.Iterator;
  
  /**
   * <p>
   * A {@link SchemaValidator} for validating the provided schema against the
   * first {@link Schema} in the iterable in {@link #validate(Schema, Iterable)}.
   * </p>
   * <p>
   * Uses the {@link SchemaValidationStrategy} provided in the constructor to
   * validate the schema against the first Schema in the iterable, if it exists,
   * via {@link SchemaValidationStrategy#validate(Schema, Schema)}.
   * </p>
   */
  public final class ValidateLatest implements SchemaValidator {
    private final SchemaValidationStrategy strategy;
  
    /**
     * @param strategy The strategy to use for validation of pairwise schemas.
     */
    public ValidateLatest(SchemaValidationStrategy strategy) {
      this.strategy = strategy;
    }
  
    @Override
    public void validate(Schema toValidate, Iterable<Schema> schemasInOrder) throws SchemaValidationException {
      Iterator<Schema> schemas = schemasInOrder.iterator();
      if (schemas.hasNext()) {
        Schema existing = schemas.next();
        strategy.validate(toValidate, existing);
      }
    }
  
  }
  