/*
    * 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 LruCacheClassPathRepository}.
   */
  public class LruCacheClassPathRepositoryTestCase {
  
      @Test
      public void testCacheEviction() throws ClassNotFoundException, IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              final LruCacheClassPathRepository repository = new LruCacheClassPathRepository(classPath, 2);
              final JavaClass class1 = repository.loadClass("java.lang.String");
              assertNotNull(class1);
              final JavaClass class2 = repository.loadClass("java.lang.Long");
              assertNotNull(class2);
              final JavaClass class3 = repository.loadClass("java.lang.Integer"); // Evicts class1
              assertNotNull(class3);
  
              assertNull(repository.findClass("java.lang.String"));
              final JavaClass cachedClass2 = repository.findClass("java.lang.Long");
              assertEquals(class2, cachedClass2);
          }
      }
  
      @Test
      public void testLeastRecentlyUsedEviction() throws ClassNotFoundException, IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              final LruCacheClassPathRepository repository = new LruCacheClassPathRepository(classPath, 2);
              final JavaClass class1 = repository.loadClass("java.lang.String");
              assertNotNull(class1);
              final JavaClass class2 = repository.loadClass("java.lang.Long");
              assertNotNull(class2);
              repository.findClass("java.lang.String"); // Uses class1
              final JavaClass class3 = repository.loadClass("java.lang.Integer"); // Evicts class2
              assertNotNull(class3);
  
              assertNull(repository.findClass("java.lang.Long"));
              final JavaClass cachedClass1 = repository.findClass("java.lang.String");
              assertEquals(class1, cachedClass1);
          }
      }
  
      @Test
      public void testZeroCacheSize() throws IOException {
          try (final ClassPath classPath = new ClassPath("")) {
              assertThrows(IllegalArgumentException.class, () -> new LruCacheClassPathRepository(classPath, 0));
          }
      }
  }