/*
    * 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
    *
   *   https://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}.
   */
  class LruCacheClassPathRepositoryTest {
  
      @Test
      void testCacheEviction() throws ClassNotFoundException, IOException {
          try (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
      void testLeastRecentlyUsedEviction() throws ClassNotFoundException, IOException {
          try (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
      void testZeroCacheSize() throws IOException {
          try (ClassPath classPath = new ClassPath("")) {
              assertThrows(IllegalArgumentException.class, () -> new LruCacheClassPathRepository(classPath, 0));
          }
      }
  }