/*
    * 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.
   */
  package org.apache.maven.surefire.common.junit3;
  
  import java.lang.reflect.Method;
  
  import org.apache.maven.surefire.api.filter.NonAbstractClassFilter;
  import org.apache.maven.surefire.api.util.ScannerFilter;
  
  import static java.lang.reflect.Modifier.isPublic;
  import static java.lang.reflect.Modifier.isStatic;
  import static org.apache.maven.surefire.api.util.ReflectionUtils.tryGetMethod;
  import static org.apache.maven.surefire.api.util.ReflectionUtils.tryLoadClass;
  
  /**
   * Missing tests ? This class is basically a subset of the JUnit4TestChecker, which is tested
   * to boredom and back. Unfortunately we don't have any common module between these providers,
   * so this stuff is duplicated. We should probably make some modules and just shade the content
   * into the providers.
   *
   * @author Kristian Rosenvold
   */
  public class JUnit3TestChecker implements ScannerFilter {
      private static final Class[] EMPTY_CLASS_ARRAY = new Class[0];
  
      private final Class<?> junitClass;
  
      private final NonAbstractClassFilter nonAbstractClassFilter = new NonAbstractClassFilter();
  
      public JUnit3TestChecker(ClassLoader testClassLoader) {
          junitClass = tryLoadClass(testClassLoader, "junit.framework.Test");
      }
  
      @Override
      public boolean accept(Class testClass) {
          return nonAbstractClassFilter.accept(testClass) && isValidJUnit3Test(testClass);
      }
  
      private boolean isValidJUnit3Test(Class<?> testClass) {
          return junitClass != null && (junitClass.isAssignableFrom(testClass) || isSuiteOnly(testClass));
      }
  
      private boolean isSuiteOnly(Class testClass) {
          final Method suite = tryGetMethod(testClass, "suite", EMPTY_CLASS_ARRAY);
          if (suite != null) {
              final int modifiers = suite.getModifiers();
              if (isPublic(modifiers) && isStatic(modifiers)) {
                  return junit.framework.Test.class.isAssignableFrom(suite.getReturnType());
              }
          }
          return false;
      }
  }