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The core HTTP and composition mechanisms of Ratpack
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/*
 * Copyright 2013 the original author or authors.
 *
 * Licensed 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 ratpack.registry.internal;

import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.reflect.TypeToken;
import ratpack.api.Nullable;
import ratpack.func.Action;
import ratpack.registry.Registry;

import java.util.Iterator;
import java.util.List;
import java.util.Optional;

public class MultiEntryRegistry implements Registry {

  private final List> entries;

  public MultiEntryRegistry(List> entries) {
    this.entries = entries;
  }

  @Override
  public String toString() {
    return "Registry{" + entries + '}';
  }

  public  Optional maybeGet(TypeToken type) {
    for (RegistryEntry entry : entries) {
      if (type.isAssignableFrom(entry.getType())) {
        @SuppressWarnings("unchecked") O cast = (O) entry.get();
        return Optional.of(cast);
      }
    }

    return Optional.empty();
  }

  public  Iterable getAll(final TypeToken type) {
    //noinspection Convert2Lambda
    return new Iterable() {
      @Override
      public Iterator iterator() {
        return new Iterator() {

          final Iterator> delegate = entries.iterator();
          O next;

          @Override
          public boolean hasNext() {
            if (next != null) {
              return true;
            }

            while (delegate.hasNext()) {
              RegistryEntry entry = delegate.next();
              if (type.isAssignableFrom(entry.getType())) {
                @SuppressWarnings("unchecked") O cast = (O) entry.get();
                next = cast;
                return true;
              }
            }

            return false;
          }

          @Override
          public O next() {
            O nextCopy = next;
            next = null;
            return nextCopy;
          }

          @Override
          public void remove() {
            throw new UnsupportedOperationException();
          }
        };
      }
    };
  }

  @Nullable
  @Override
  public  Optional first(TypeToken type, Predicate predicate) {
    for (RegistryEntry entry : entries) {
      if (type.isAssignableFrom(entry.getType())) {
        @SuppressWarnings("unchecked") O cast = (O) entry.get();
        if (predicate.apply(cast)) {
          return Optional.of(cast);
        }
      }
    }
    return Optional.empty();
  }

  @Override
  public  Iterable all(TypeToken type, Predicate predicate) {

    ImmutableList.Builder builder = ImmutableList.builder();
    for (RegistryEntry entry : entries) {
      if (type.isAssignableFrom(entry.getType())) {
        @SuppressWarnings("unchecked") O cast = (O) entry.get();
        if (predicate.apply(cast)) {
          builder.add(cast);
        }
      }
    }
    return builder.build();
  }

  @Override
  public  boolean each(TypeToken type, Predicate predicate, Action action) throws Exception {
    boolean foundMatch = false;
    for (RegistryEntry entry : entries) {
      if (type.isAssignableFrom(entry.getType())) {
        @SuppressWarnings("unchecked") O cast = (O) entry.get();
        if (predicate.apply(cast)) {
          action.execute(cast);
          foundMatch = true;
        }
      }
    }
    return foundMatch;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    MultiEntryRegistry that = (MultiEntryRegistry) o;

    return entries.equals(that.entries);
  }

  @Override
  public int hashCode() {
    return entries.hashCode();
  }
}