| /* |
| * 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); |
| } |
| } |
| } |