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 java.io.IOException;
  import java.util.Iterator;
  import java.util.Optional;
  
  import com.google.common.collect.ImmutableMap;
  
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  import org.apache.cassandra.tcm.serialization.MetadataSerializer;
  import org.apache.cassandra.tcm.serialization.Version;
  
  import static com.google.common.collect.Iterables.filter;
  import static org.apache.cassandra.db.TypeSizes.sizeof;
  
  public final class Triggers implements Iterable<TriggerMetadata>
  {
      public static final Serializer serializer = new Serializer();
  
      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 static Triggers of(TriggerMetadata... triggers)
      {
          return builder().add(triggers).build();
      }
  
      public static Triggers of(Iterable<TriggerMetadata> triggers)
      {
          return builder().add(triggers).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(TriggerMetadata... triggers)
          {
              for (TriggerMetadata trigger : triggers)
                  add(trigger);
              return this;
          }
  
          public Builder add(Iterable<TriggerMetadata> triggers)
          {
              triggers.forEach(this::add);
              return this;
          }
      }
  
      public static class Serializer implements MetadataSerializer<Triggers>
      {
          public void serialize(Triggers t, DataOutputPlus out, Version version) throws IOException
          {
              out.writeInt(t.triggers.size());
              for (TriggerMetadata tm : t.triggers.values())
                  TriggerMetadata.serializer.serialize(tm, out, version);
          }
  
          public Triggers deserialize(DataInputPlus in, Version version) throws IOException
          {
              int size = in.readInt();
              Builder builder = builder();
              for (int i = 0; i < size; i++)
              {
                  TriggerMetadata tm = TriggerMetadata.serializer.deserialize(in, version);
                  builder.add(tm);
              }
              return builder.build();
          }
  
          public long serializedSize(Triggers t, Version version)
          {
              int size = sizeof(t.triggers.size());
              for (TriggerMetadata tm : t.triggers.values())
                  size += TriggerMetadata.serializer.serializedSize(tm, version);
              return size;
          }
      }
  }
  