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Mutation testing system for Java.
There is a newer version: 1.16.1
/*
 * Copyright 2010 Henry Coles
 * 
 * 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 org.pitest.functional;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Functional programming style operations for plain old Java iterables.
 */
public abstract class FCollection {

  public static  void forEach(final Iterable as,
      final SideEffect1 e) {
    for (final A a : as) {
      e.apply(a);
    }
  }

  public static  void mapTo(final Iterable as,
      final F f, final Collection bs) {
    if (as != null) {

      for (final A a : as) {
        bs.add(f.apply(a));
      }
    }
  }

  public static  FunctionalList map(final Iterable as,
      final F f) {
    final FunctionalList bs = emptyList();
    mapTo(as, f, bs);
    return bs;
  }

  public static  void flatMapTo(final Iterable as,
      final F> f, final Collection bs) {
    if (as != null) {
      for (final A a : as) {
        for (final B each : f.apply(a)) {
          bs.add(each);
        }
      }
    }
  }

  public static  FunctionalList flatMap(
      final Iterable as, final F> f) {
    final FunctionalList bs = emptyList();
    flatMapTo(as, f, bs);
    return bs;
  }

  private static  FunctionalList emptyList() {
    return new MutableList();
  }

  public static  FunctionalList filter(final Iterable xs,
      final F predicate) {
    final FunctionalList dest = emptyList();
    filter(xs, predicate, dest);
    return dest;
  }

  public static  void filter(final Iterable xs,
      final F predicate, final Collection dest) {
    for (final T x : xs) {
      if (predicate.apply(x)) {
        dest.add(x);
      }
    }
  }

  public static  boolean contains(final Iterable xs,
      final F predicate) {
    for (final T x : xs) {
      if (predicate.apply(x)) {
        return true;
      }
    }
    return false;

  }

  public static  A fold(final F2 f, final A z,
      final Iterable xs) {
    A p = z;
    for (final B x : xs) {
      p = f.apply(p, x);
    }
    return p;
  }

  public static  FunctionalCollection flatten(
      final Iterable> ts) {
    final MutableList list = new MutableList();
    for (final Iterable it : ts) {
      for (final T each : it) {
        list.add(each);
      }
    }
    return list;
  }

  public static  FunctionalList> splitToLength(
      final int targetLength, final Iterable ts) {
    final FunctionalList> list = new MutableList>();
    List temp = new ArrayList();
    int i = 0;
    for (final T each : ts) {
      if (i == targetLength) {
        list.add(temp);
        temp = new ArrayList();
        i = 0;
      }
      temp.add(each);
      i++;
    }
    if (!temp.isEmpty()) {
      list.add(temp);
    }
    return list;
  }

  public static  Map> bucket(final Iterable bs,
      final F f) {
    final Map> bucketed = new HashMap>();
    for (final B each : bs) {
      final A key = f.apply(each);
      Collection existing = bucketed.get(key);
      if (existing == null) {
        existing = new ArrayList();
        bucketed.put(key, existing);
      }
      existing.add(each);
    }
    return bucketed;
  }

}