| /* |
| * 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 java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.function.Predicate; |
| import java.util.stream.Stream; |
| import java.util.stream.StreamSupport; |
| |
| import javax.annotation.Nullable; |
| |
| import com.google.common.collect.*; |
| |
| import org.apache.cassandra.db.marshal.UserType; |
| |
| import static com.google.common.collect.Iterables.any; |
| import static com.google.common.collect.Iterables.transform; |
| |
| public final class Views implements Iterable<ViewMetadata> |
| { |
| private static final Views NONE = builder().build(); |
| |
| private final ImmutableMap<String, ViewMetadata> views; |
| |
| private Views(Builder builder) |
| { |
| views = ImmutableMap.copyOf(builder.views); |
| } |
| |
| public static Builder builder() |
| { |
| return new Builder(); |
| } |
| |
| public Builder unbuild() |
| { |
| return builder().put(this); |
| } |
| |
| public static Views none() |
| { |
| return NONE; |
| } |
| |
| public Iterator<ViewMetadata> iterator() |
| { |
| return views.values().iterator(); |
| } |
| |
| Iterable<TableMetadata> allTableMetadata() |
| { |
| return Iterables.transform(views.values(), view -> view.metadata); |
| } |
| |
| public int size() |
| { |
| return views.size(); |
| } |
| |
| public boolean isEmpty() |
| { |
| return views.isEmpty(); |
| } |
| |
| public Iterable<ViewMetadata> forTable(TableId tableId) |
| { |
| return Iterables.filter(this, v -> v.baseTableId.equals(tableId)); |
| } |
| |
| public Stream<ViewMetadata> stream() |
| { |
| return StreamSupport.stream(spliterator(), false); |
| } |
| |
| public Stream<ViewMetadata> stream(TableId tableId) |
| { |
| return stream().filter(v -> v.baseTableId.equals(tableId)); |
| } |
| |
| /** |
| * Get the materialized view with the specified name |
| * |
| * @param name a non-qualified materialized view name |
| * @return an empty {@link Optional} if the materialized view name is not found; a non-empty optional of {@link ViewMetadata} otherwise |
| */ |
| public Optional<ViewMetadata> get(String name) |
| { |
| return Optional.ofNullable(views.get(name)); |
| } |
| |
| /** |
| * Get the view with the specified name |
| * |
| * @param name a non-qualified view name |
| * @return null if the view name is not found; the found {@link ViewMetadata} otherwise |
| */ |
| @Nullable |
| public ViewMetadata getNullable(String name) |
| { |
| return views.get(name); |
| } |
| |
| boolean containsView(String name) |
| { |
| return views.containsKey(name); |
| } |
| |
| Views filter(Predicate<ViewMetadata> predicate) |
| { |
| Builder builder = builder(); |
| views.values().stream().filter(predicate).forEach(builder::put); |
| return builder.build(); |
| } |
| |
| /** |
| * Create a MaterializedViews instance with the provided materialized view added |
| */ |
| public Views with(ViewMetadata view) |
| { |
| if (get(view.name()).isPresent()) |
| throw new IllegalStateException(String.format("Materialized View %s already exists", view.name())); |
| |
| return builder().put(this).put(view).build(); |
| } |
| |
| public Views withSwapped(ViewMetadata view) |
| { |
| return without(view.name()).with(view); |
| } |
| |
| /** |
| * Creates a MaterializedViews instance with the materializedView with the provided name removed |
| */ |
| public Views without(String name) |
| { |
| ViewMetadata materializedView = |
| get(name).orElseThrow(() -> new IllegalStateException(String.format("Materialized View %s doesn't exists", name))); |
| |
| return filter(v -> v != materializedView); |
| } |
| |
| Views withUpdatedUserTypes(UserType udt) |
| { |
| return any(this, v -> v.referencesUserType(udt.name)) |
| ? builder().put(transform(this, v -> v.withUpdatedUserType(udt))).build() |
| : this; |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| return this == o || (o instanceof Views && views.equals(((Views) o).views)); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return views.hashCode(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return views.values().toString(); |
| } |
| |
| public static final class Builder |
| { |
| final Map<String, ViewMetadata> views = new HashMap<>(); |
| |
| private Builder() |
| { |
| } |
| |
| public Views build() |
| { |
| return new Views(this); |
| } |
| |
| public ViewMetadata get(String name) |
| { |
| return views.get(name); |
| } |
| |
| public Builder put(ViewMetadata view) |
| { |
| views.put(view.name(), view); |
| return this; |
| } |
| |
| public Builder remove(String name) |
| { |
| views.remove(name); |
| return this; |
| } |
| |
| public Builder put(Iterable<ViewMetadata> views) |
| { |
| views.forEach(this::put); |
| return this; |
| } |
| } |
| |
| static ViewsDiff diff(Views before, Views after) |
| { |
| return ViewsDiff.diff(before, after); |
| } |
| |
| static final class ViewsDiff extends Diff<Views, ViewMetadata> |
| { |
| private static final ViewsDiff NONE = new ViewsDiff(Views.none(), Views.none(), ImmutableList.of()); |
| |
| private ViewsDiff(Views created, Views dropped, ImmutableCollection<Altered<ViewMetadata>> altered) |
| { |
| super(created, dropped, altered); |
| } |
| |
| private static ViewsDiff diff(Views before, Views after) |
| { |
| if (before == after) |
| return NONE; |
| |
| Views created = after.filter(v -> !before.containsView(v.name())); |
| Views dropped = before.filter(v -> !after.containsView(v.name())); |
| |
| ImmutableList.Builder<Altered<ViewMetadata>> altered = ImmutableList.builder(); |
| before.forEach(viewBefore -> |
| { |
| ViewMetadata viewAfter = after.getNullable(viewBefore.name()); |
| if (null != viewAfter) |
| viewBefore.compare(viewAfter).ifPresent(kind -> altered.add(new Altered<>(viewBefore, viewAfter, kind))); |
| }); |
| |
| return new ViewsDiff(created, dropped, altered.build()); |
| } |
| } |
| } |