1 /*
   2  * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.graph.test.matchers;
  26 
  27 import org.hamcrest.Description;
  28 import org.hamcrest.Matcher;
  29 import org.hamcrest.TypeSafeDiagnosingMatcher;
  30 import org.hamcrest.core.IsNot;
  31 
  32 import org.graalvm.compiler.graph.iterators.NodeIterable;
  33 
  34 public class NodeIterableIsEmpty extends TypeSafeDiagnosingMatcher<NodeIterable<?>> {
  35 
  36     private static final NodeIterableIsEmpty INSTANCE = new NodeIterableIsEmpty();
  37 
  38     @Override
  39     public boolean matchesSafely(NodeIterable<?> iterable, Description mismatchDescription) {
  40         mismatchDescription.appendText("is a non-empty NodeIterable");
  41         return iterable.isEmpty();
  42     }
  43 
  44     @Override
  45     public void describeTo(Description description) {
  46         description.appendText("is an empty NodeIterable");
  47     }
  48 
  49     public static Matcher<NodeIterable<?>> isEmpty() {
  50         return INSTANCE;
  51     }
  52 
  53     public static Matcher<NodeIterable<?>> isNotEmpty() {
  54         return IsNot.not(INSTANCE);
  55     }
  56 }