CollectionContainsContract.java

/*
 * Copyright 2015 McDowell
 *
 * 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 uk.kludje.testcontract.util.collection;

import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;

import static uk.kludje.testcontract.ContractViolationException.assertThat;

public class CollectionContainsContract {

  public static <E> void assertIteratorContains(Collection<E> coll) {
    Iterator<E> it = coll.iterator();
    while (it.hasNext()) {
      assertThat(coll.contains(it.next()), "assertIteratorContains: " + coll.getClass());
    }
  }

  public static <E> void assertStreamContains(Collection<E> coll) {
    assertThat(coll.stream().map(coll::contains).allMatch(b -> b == true), "assertStreamContains: " + coll.getClass());
  }

  public static <E> void assertToArrayContains(Collection<E> coll) {
    assertThat(Arrays.asList(coll.toArray()).stream().map(coll::contains).allMatch(b -> b == true), "assertToArrayContains: " + coll.getClass());
  }
}