/*
    * Copyright (C) 2018, Google LLC. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  package org.eclipse.jgit.transport;
  
  import java.util.Collection;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.Sets;
  import org.hamcrest.Description;
  import org.hamcrest.Matcher;
  import org.hamcrest.TypeSafeMatcher;
  
  /**
   * Multiple tests check that a collection of ObjectIds contain certain SHA1
   * (written as strings). This matcher hides the ObjectId to string conversion to
   * make the assertion more readable:
   *
   * assertThat(req.getWantsIds(), hasOnlyObjectIds("123123", "234234"));
   */
  class ObjectIdMatcher extends TypeSafeMatcher<Collection<ObjectId>> {
  
  	private final Set<ObjectId> expectedOids;
  
  	private ObjectIdMatcher(Set<String> oids) {
  		this.expectedOids = oids.stream().map(ObjectId::fromString)
  				.collect(Collectors.toSet());
  	}
  
  	@Override
  	public void describeTo(Description desc) {
  		desc.appendText("Object ids:");
  		desc.appendValueList("<", ",", ">", expectedOids);
  	}
  
  	@Override
  	protected boolean matchesSafely(Collection<ObjectId> resultOids) {
  		return resultOids.containsAll(expectedOids)
  				&& expectedOids.containsAll(resultOids);
  	}
  
  	/**
  	 * Assert that all and only the received {@link ObjectId object ids} are in
  	 * the expected set.
  	 * <p>
  	 * ObjectIds are compared by SHA1.
  	 *
  	 * @param oids
  	 *            Object ids to examine.
  	 * @return true if examined and specified sets contains exactly the same
  	 *         elements.
  	 */
  	static Matcher<Collection<ObjectId>> hasOnlyObjectIds(
  			String... oids) {
  		return new ObjectIdMatcher(Sets.of(oids));
  	}
  }