/*
    * 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.bcel.util;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  
  import org.apache.bcel.classfile.JavaClass;
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link ClassPathRepository}, {@link MemorySensitiveClassPathRepository}, and
   * {@link LruCacheClassPathRepository} for their common attributes of caching.
   *
   * <p>
   * Without memory scarcity, these classes behave in the same manner.
   */
  public class ClassPathRepositoryTestCase {
  
      @Test
      public void testClassPath() throws IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              final ClassPathRepository repository = new ClassPathRepository(classPath);
              try (final ClassPath repoCp = repository.getClassPath()) {
                  assertEquals(classPath, repoCp);
              }
          }
      }
  
      @Test
      public void testClassPathRepository() throws ClassNotFoundException, IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              verifyCaching(new ClassPathRepository(classPath));
          }
      }
  
      @Test
      public void testClassWithoutPackage() throws IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              final ClassPathRepository repository = new ClassPathRepository(classPath);
              assertThrows(ClassNotFoundException.class, () -> repository.loadClass("ClassXYZ"));
          }
      }
  
      @Test
      public void testEmptyInput() throws IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              final ClassPathRepository repository = new ClassPathRepository(classPath);
              assertThrows(IllegalArgumentException.class, () -> repository.loadClass(""));
          }
      }
  
      @Test
      public void testLruCacheClassPathRepository() throws ClassNotFoundException, IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              verifyCaching(new LruCacheClassPathRepository(classPath, 10));
          }
      }
  
      @Test
      public void testMemorySensitiveClassPathRepository() throws ClassNotFoundException, IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              verifyCaching(new MemorySensitiveClassPathRepository(classPath));
          }
      }
  
      @Test
      public void testNoClassNotFound() throws IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              final ClassPathRepository repository = new ClassPathRepository(classPath);
              assertThrows(ClassNotFoundException.class, () -> repository.loadClass("no.such.Class"));
          }
      }
  
      @Test
      public void testNullInput() throws IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              final ClassPathRepository repository = new ClassPathRepository(classPath);
              assertThrows(IllegalArgumentException.class, () -> repository.loadClass((String) null));
          }
      }
 
     private void verifyCaching(final AbstractClassPathRepository repository) throws ClassNotFoundException {
         // Tests loadClass()
         final JavaClass class1 = repository.loadClass("java.lang.String");
         assertNotNull(class1);
         final JavaClass class2 = repository.loadClass("java/lang/Long"); // Slashes should work
         assertNotNull(class2);
 
         // Tests findClass()
         assertEquals(class1, repository.findClass("java.lang.String"));
         assertEquals(class2, repository.findClass("java.lang.Long"));
 
         // Tests removeClass()
         repository.removeClass(class1);
         assertNull(repository.findClass("java.lang.String"));
 
         // Tests clear()
         repository.clear();
         assertNull(repository.findClass("java.lang.Long"));
     }
 }