Changes.java example

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/*
 * Copyright 2017 Google Inc. All Rights Reserved.
 *
 * 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.google.errorprone.bugpatterns.argumentselectiondefects;

import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableList;

/**
 * Value class for holding suggested changes to method call arguments.
 *
 * @author andrewrice@google.com (Andrew Rice)
 */
@AutoValue
abstract class Changes {

  abstract ImmutableList<Double> originalCost();

  abstract ImmutableList<Double> assignmentCost();

  abstract ImmutableList<ParameterPair> changedPairs();

  boolean isEmpty() {
    return changedPairs().isEmpty();
  }

  double totalAssignmentCost() {
    return assignmentCost().stream().mapToDouble(d -> d).sum();
  }

  double totalOriginalCost() {
    return originalCost().stream().mapToDouble(d -> d).sum();
  }
  
  static Changes create(
      ImmutableList<Double> originalCost,
      ImmutableList<Double> assignmentCost,
      ImmutableList<ParameterPair> changedPairs) {
    return new AutoValue_Changes(originalCost, assignmentCost, changedPairs);
  }

  static Changes empty() {
    return new AutoValue_Changes(ImmutableList.of(), ImmutableList.of(), ImmutableList.of());
  }
}