| /* |
| * 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.Iterator; |
| import java.util.Optional; |
| |
| import javax.annotation.Nullable; |
| |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.MapDifference; |
| import com.google.common.collect.Maps; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.config.ViewDefinition; |
| |
| import static com.google.common.collect.Iterables.filter; |
| |
| public final class Views implements Iterable<ViewDefinition> |
| { |
| private final ImmutableMap<String, ViewDefinition> views; |
| |
| private Views(Builder builder) |
| { |
| views = builder.views.build(); |
| } |
| |
| public static Builder builder() |
| { |
| return new Builder(); |
| } |
| |
| public static Views none() |
| { |
| return builder().build(); |
| } |
| |
| public Iterator<ViewDefinition> iterator() |
| { |
| return views.values().iterator(); |
| } |
| |
| public Iterable<CFMetaData> metadatas() |
| { |
| return Iterables.transform(views.values(), view -> view.metadata); |
| } |
| |
| public int size() |
| { |
| return views.size(); |
| } |
| |
| public boolean isEmpty() |
| { |
| return views.isEmpty(); |
| } |
| |
| /** |
| * 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 ViewDefinition} otherwise |
| */ |
| public Optional<ViewDefinition> 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 ViewDefinition} otherwise |
| */ |
| @Nullable |
| public ViewDefinition getNullable(String name) |
| { |
| return views.get(name); |
| } |
| |
| /** |
| * Create a MaterializedViews instance with the provided materialized view added |
| */ |
| public Views with(ViewDefinition view) |
| { |
| if (get(view.viewName).isPresent()) |
| throw new IllegalStateException(String.format("Materialized View %s already exists", view.viewName)); |
| |
| return builder().add(this).add(view).build(); |
| } |
| |
| /** |
| * Creates a MaterializedViews instance with the materializedView with the provided name removed |
| */ |
| public Views without(String name) |
| { |
| ViewDefinition materializedView = |
| get(name).orElseThrow(() -> new IllegalStateException(String.format("Materialized View %s doesn't exists", name))); |
| |
| return builder().add(filter(this, v -> v != materializedView)).build(); |
| } |
| |
| /** |
| * Creates a MaterializedViews instance which contains an updated materialized view |
| */ |
| public Views replace(ViewDefinition view, CFMetaData cfm) |
| { |
| return without(view.viewName).with(view); |
| } |
| |
| MapDifference<String, ViewDefinition> diff(Views other) |
| { |
| return Maps.difference(views, other.views); |
| } |
| |
| @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 ImmutableMap.Builder<String, ViewDefinition> views = new ImmutableMap.Builder<>(); |
| |
| private Builder() |
| { |
| } |
| |
| public Views build() |
| { |
| return new Views(this); |
| } |
| |
| |
| public Builder add(ViewDefinition view) |
| { |
| views.put(view.viewName, view); |
| return this; |
| } |
| |
| public Builder add(Iterable<ViewDefinition> views) |
| { |
| views.forEach(this::add); |
| return this; |
| } |
| } |
| } |