| /* |
| * 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 com.google.common.collect.ImmutableMap; |
| |
| import static com.google.common.collect.Iterables.filter; |
| |
| public final class Triggers implements Iterable<TriggerMetadata> |
| { |
| private final ImmutableMap<String, TriggerMetadata> triggers; |
| |
| private Triggers(Builder builder) |
| { |
| triggers = builder.triggers.build(); |
| } |
| |
| public static Builder builder() |
| { |
| return new Builder(); |
| } |
| |
| public static Triggers none() |
| { |
| return builder().build(); |
| } |
| |
| public Iterator<TriggerMetadata> iterator() |
| { |
| return triggers.values().iterator(); |
| } |
| |
| public int size() |
| { |
| return triggers.size(); |
| } |
| |
| public boolean isEmpty() |
| { |
| return triggers.isEmpty(); |
| } |
| |
| /** |
| * Get the trigger with the specified name |
| * |
| * @param name a non-qualified trigger name |
| * @return an empty {@link Optional} if the trigger name is not found; a non-empty optional of {@link TriggerMetadata} otherwise |
| */ |
| public Optional<TriggerMetadata> get(String name) |
| { |
| return Optional.ofNullable(triggers.get(name)); |
| } |
| |
| /** |
| * Create a Triggers instance with the provided trigger added |
| */ |
| public Triggers with(TriggerMetadata trigger) |
| { |
| if (get(trigger.name).isPresent()) |
| throw new IllegalStateException(String.format("Trigger %s already exists", trigger.name)); |
| |
| return builder().add(this).add(trigger).build(); |
| } |
| |
| /** |
| * Creates a Triggers instance with the trigger with the provided name removed |
| */ |
| public Triggers without(String name) |
| { |
| TriggerMetadata trigger = |
| get(name).orElseThrow(() -> new IllegalStateException(String.format("Trigger %s doesn't exists", name))); |
| |
| return builder().add(filter(this, t -> t != trigger)).build(); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| return this == o || (o instanceof Triggers && triggers.equals(((Triggers) o).triggers)); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return triggers.hashCode(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return triggers.values().toString(); |
| } |
| |
| public static final class Builder |
| { |
| final ImmutableMap.Builder<String, TriggerMetadata> triggers = new ImmutableMap.Builder<>(); |
| |
| private Builder() |
| { |
| } |
| |
| public Triggers build() |
| { |
| return new Triggers(this); |
| } |
| |
| public Builder add(TriggerMetadata trigger) |
| { |
| triggers.put(trigger.name, trigger); |
| return this; |
| } |
| |
| public Builder add(Iterable<TriggerMetadata> triggers) |
| { |
| triggers.forEach(this::add); |
| return this; |
| } |
| } |
| } |