001package org.junit.experimental.runners;
002
003import java.lang.reflect.Modifier;
004import java.util.ArrayList;
005import java.util.List;
006
007import org.junit.runners.Suite;
008import org.junit.runners.model.RunnerBuilder;
009
010/**
011 * If you put tests in inner classes, Ant, for example, won't find them. By running the outer class
012 * with Enclosed, the tests in the inner classes will be run. You might put tests in inner classes
013 * to group them for convenience or to share constants. Abstract inner classes are ignored.
014 * <p>
015 * So, for example:
016 * <pre>
017 * &#064;RunWith(Enclosed.class)
018 * public class ListTests {
019 *     ...useful shared stuff...
020 *     public static class OneKindOfListTest {...}
021 *     public static class AnotherKind {...}
022 *     abstract public static class Ignored {...}
023 * }
024 * </pre>
025 */
026public class Enclosed extends Suite {
027    /**
028     * Only called reflectively. Do not use programmatically.
029     */
030    public Enclosed(Class<?> klass, RunnerBuilder builder) throws Throwable {
031        super(builder, klass, filterAbstractClasses(klass.getClasses()));
032    }
033    
034    private static Class<?>[] filterAbstractClasses(final Class<?>[] classes) {     
035        final List<Class<?>> filteredList= new ArrayList<Class<?>>(classes.length);
036
037        for (final Class<?> clazz : classes) {
038            if (!Modifier.isAbstract(clazz.getModifiers())) {
039                filteredList.add(clazz);
040            }
041        }
042        
043        return filteredList.toArray(new Class<?>[filteredList.size()]);
044    }   
045}