package org.apache.maven.surefire.its.fixture;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  
  import org.hamcrest.BaseMatcher;
  import org.hamcrest.Description;
  import org.hamcrest.Matcher;
  
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.Set;
  
  import static java.util.Collections.singleton;
  
  /**
   * Java Hamcrest Matcher with Regex.
   */
  public final class IsRegex
          extends BaseMatcher<Set<String>>
  {
      public static Matcher<Set<String>> regex( Set<String> expectedRegex )
      {
          return new IsRegex( expectedRegex );
      }
  
      public static Matcher<Set<String>> regex( String expectedRegex )
      {
          return new IsRegex( expectedRegex );
      }
  
      private final Set<String> expectedRegex;
  
      private IsRegex( String expectedRegex )
      {
          this.expectedRegex = singleton( expectedRegex );
      }
  
      private IsRegex( Set<String> expectedRegex )
      {
          this.expectedRegex = expectedRegex;
      }
  
      @Override
      public boolean matches( Object o )
      {
          if ( o != null
                  && expectedRegex.size() == 1 ? isStringOrSet( o ) : isSet( o ) )
          {
              //noinspection unchecked
              Set<String> actual = isSet( o ) ? ( Set<String> ) o : singleton( ( String ) o );
              boolean matches = actual.size() == expectedRegex.size();
              Iterator<String> regex = expectedRegex.iterator();
              for ( String s : actual )
              {
                  if ( s == null || !regex.hasNext() || !s.matches( regex.next() ) )
                  {
                      matches = false;
                  }
              }
              return matches;
          }
          else
          {
              return false;
          }
      }
  
      @Override
      public void describeTo( Description description )
      {
          description.appendValue( expectedRegex );
      }
  
      private static boolean isStringOrSet( Object o )
      {
          return o instanceof String || o instanceof Set;
      }
  
      private static boolean isSet( Object o )
      {
          return o instanceof Set;
      }
 }