/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.http.impl.client.cache.memcached;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  
  import org.apache.http.client.cache.HttpCacheEntry;
  import org.apache.http.impl.client.cache.DefaultHttpCacheEntrySerializer;
  import org.apache.http.impl.client.cache.HttpTestUtils;
  import org.junit.Before;
  import org.junit.Test;
  
  
  public class TestMemcachedCacheEntryImpl {
  
      private MemcachedCacheEntryImpl impl;
      private HttpCacheEntry entry;
  
      @Before
      public void setUp() {
          entry = HttpTestUtils.makeCacheEntry();
          impl = new MemcachedCacheEntryImpl("foo", entry);
      }
  
      @Test
      public void canBeCreatedEmpty() {
          impl = new MemcachedCacheEntryImpl();
          assertNull(impl.getStorageKey());
          assertNull(impl.getHttpCacheEntry());
      }
  
      @Test
      public void canBeSerialized() {
          final byte[] bytes = impl.toByteArray();
          assertNotNull(bytes);
          assertTrue(bytes.length > 0);
      }
  
      @Test
      public void knowsItsCacheKey() {
          assertEquals("foo", impl.getStorageKey());
      }
  
      @Test
      public void knowsItsCacheEntry() {
          assertEquals(entry, impl.getHttpCacheEntry());
      }
  
      @Test
      public void canBeReconstitutedFromByteArray() throws Exception {
          final String key = impl.getStorageKey();
          final HttpCacheEntry entry1 = impl.getHttpCacheEntry();
          final byte[] bytes = impl.toByteArray();
          impl = new MemcachedCacheEntryImpl();
          impl.set(bytes);
  
          assertEquals(key, impl.getStorageKey());
          assertEquivalent(entry1, impl.getHttpCacheEntry());
      }
  
      @Test(expected=MemcachedSerializationException.class)
      public void cannotReconstituteFromGarbage() {
          impl = new MemcachedCacheEntryImpl();
          final byte[] bytes = HttpTestUtils.getRandomBytes(128);
          impl.set(bytes);
      }
  
      private void assertEquivalent(final HttpCacheEntry entry,
              final HttpCacheEntry resultEntry) throws IOException {
         /* Ugh. Implementing HttpCacheEntry#equals is problematic
          * due to the Resource response body (may cause unexpected
          * I/O to users). Checking that two entries
          * serialize to the same bytes seems simpler, on the whole,
          * (while still making for a somewhat yucky test). At
          * least we encapsulate it off here in its own method so
          * the test that uses it remains clear.
          */
         final DefaultHttpCacheEntrySerializer ser = new DefaultHttpCacheEntrySerializer();
         final ByteArrayOutputStream bos1 = new ByteArrayOutputStream();
         ser.writeTo(entry, bos1);
         final byte[] bytes1 = bos1.toByteArray();
         final ByteArrayOutputStream bos2 = new ByteArrayOutputStream();
         ser.writeTo(resultEntry, bos2);
         final byte[] bytes2 = bos2.toByteArray();
         assertEquals(bytes1.length, bytes2.length);
         for(int i = 0; i < bytes1.length; i++) {
             assertEquals(bytes1[i], bytes2[i]);
         }
     }
 }