/*
 * Copyright 2014-present Facebook, Inc.
 *
 * 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 com.facebook.buck.parser;

import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.rules.TargetNode;
import com.facebook.buck.util.immutables.BuckStyleImmutable;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableMap;
import java.util.Optional;
import org.immutables.value.Value;

/**
 * Matches all {@link TargetNode} objects in a repository that match the given {@link Predicate}.
 */
@Value.Immutable(builder = false)
@BuckStyleImmutable
abstract class AbstractTargetNodePredicateSpec implements TargetNodeSpec {

  @Value.Parameter
  public abstract Predicate<? super TargetNode<?, ?>> getPredicate();

  @Override
  @Value.Parameter
  public abstract BuildFileSpec getBuildFileSpec();

  @Override
  public TargetType getTargetType() {
    return TargetType.MULTIPLE_TARGETS;
  }

  @Override
  public ImmutableMap<BuildTarget, Optional<TargetNode<?, ?>>> filter(
      Iterable<TargetNode<?, ?>> nodes) {
    ImmutableMap.Builder<BuildTarget, Optional<TargetNode<?, ?>>> resultBuilder =
        ImmutableMap.builder();

    for (TargetNode<?, ?> node : nodes) {
      if (getPredicate().apply(node)) {
        resultBuilder.put(node.getBuildTarget(), Optional.of(node));
      }
    }

    return resultBuilder.build();
  }
}