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.cassandra.schema;
  
  import com.google.common.collect.ImmutableCollection;
  import com.google.common.collect.Iterables;
  
  public class Diff<T extends Iterable, S>
  {
      public final T created;
      public final T dropped;
      public final ImmutableCollection<Altered<S>> altered;
  
      Diff(T created, T dropped, ImmutableCollection<Altered<S>> altered)
      {
          this.created = created;
          this.dropped = dropped;
          this.altered = altered;
      }
  
      boolean isEmpty()
      {
          return Iterables.isEmpty(created) && Iterables.isEmpty(dropped) && Iterables.isEmpty(altered);
      }
  
      Iterable<Altered<S>> altered(Difference kind)
      {
          return Iterables.filter(altered, a -> a.kind == kind);
      }
  
      public static final class Altered<T>
      {
          public final T before;
          public final T after;
          public final Difference kind;
  
          Altered(T before, T after, Difference kind)
          {
              this.before = before;
              this.after = after;
              this.kind = kind;
          }
  
          public String toString()
          {
              return String.format("%s -> %s (%s)", before, after, kind);
          }
      }
  
      @Override
      public String toString()
      {
          return "Diff{" +
                 "created=" + created +
                 ", dropped=" + dropped +
                 ", altered=" + altered +
                 '}';
      }
  
  }
  