package org.apache.maven.surefire.util;

 /*

  * 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 java.util.ArrayList;

 import java.util.Arrays;

 import java.util.Collections;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Set;

 import org.apache.maven.surefire.testset.TestSetFailedException;

 /**

  * Contains all the tests that have been found according to specified include/exclude

  * specification for a given surefire run.

  *

  * @author Kristian Rosenvold (junit core adaption)

  */

 public class TestsToRun implements Iterable<Class>

 {

     private final List<Class> locatedClasses;

     /**

      * Constructor

      *

      * @param locatedClasses A list of java.lang.Class objects representing tests to run

      */

     public TestsToRun( List<Class> locatedClasses )

     {

         this.locatedClasses = Collections.unmodifiableList( locatedClasses );

         Set<Class> testSets = new HashSet<Class>();

         for ( Class testClass : locatedClasses )

         {

             if ( testSets.contains( testClass ) )

             {

                 throw new RuntimeException( "Duplicate test set '" + testClass.getName() + "'" );

             }

             testSets.add( testClass );

         }

     }

     public static TestsToRun fromClass( Class clazz )

         throws TestSetFailedException

     {

         return new TestsToRun( Arrays.<Class>asList( clazz ) );

     }

     /**

      * Returns an iterator over the located java.lang.Class objects

      *

      * @return an unmodifiable iterator

      */

     public Iterator<Class> iterator()

     {

         return locatedClasses.iterator();

     }

     public String toString()

     {

         StringBuilder sb = new StringBuilder();

         sb.append( "TestsToRun: [" );

         Iterator it = iterator();

         while ( it.hasNext() )

         {

             Class clazz = (Class) it.next();

             sb.append( " " ).append( clazz.getName() );

         }

         sb.append( ']' );

         return sb.toString();

     }

     public boolean containsAtLeast( int atLeast )

     {

         return containsAtLeast( iterator(), atLeast );

     }

     private boolean containsAtLeast( Iterator it, int atLeast )

     {

         for ( int i = 0; i < atLeast; i++ )

         {

             if ( !it.hasNext() )

             {

                 return false;

             }

             it.next();

         }

         return true;

     }

     public boolean containsExactly( int items )

     {

         Iterator it = iterator();

         return containsAtLeast( it, items ) && !it.hasNext();

     }

     /**

      * @return {@code true}, if the classes may be read eagerly. {@code false},

      *         if the classes must only be read lazy.

      */

     public boolean allowEagerReading()

     {

         return true;

     }

     public Class[] getLocatedClasses()

     {

         if ( !allowEagerReading() )

         {

             throw new IllegalStateException( "Cannot eagerly read" );

         }

         List<Class> result = new ArrayList<Class>();

         Iterator<Class> it = iterator();

         while ( it.hasNext() )

         {

             result.add( it.next() );

         }

         return result.toArray( new Class[result.size()] );

     }

 }