content: /*
   * Copyright (C) 2019 The Android Open Source Project
   *
   * Licensed 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 com.google.android.exoplayer2.upstream.cache;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.database.DatabaseIOException;
  import com.google.android.exoplayer2.testutil.TestUtil;
  import java.util.HashSet;
  import java.util.Map;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Tests {@link CacheFileMetadataIndex}. */
  @RunWith(AndroidJUnit4.class)
  public class CacheFileMetadataIndexTest {
  
    @Test
    public void initiallyEmpty() throws DatabaseIOException {
      CacheFileMetadataIndex index = newInitializedIndex();
      assertThat(index.getAll()).isEmpty();
    }
  
    @Test
    public void insert() throws DatabaseIOException {
      CacheFileMetadataIndex index = newInitializedIndex();
  
      index.set("name1", /* length= */ 123, /* lastTouchTimestamp= */ 456);
      index.set("name2", /* length= */ 789, /* lastTouchTimestamp= */ 123);
  
      Map<String, CacheFileMetadata> all = index.getAll();
      assertThat(all.size()).isEqualTo(2);
  
      CacheFileMetadata metadata = all.get("name1");
      assertThat(metadata).isNotNull();
      assertThat(metadata.length).isEqualTo(123);
      assertThat(metadata.lastTouchTimestamp).isEqualTo(456);
  
      metadata = all.get("name2");
      assertThat(metadata).isNotNull();
      assertThat(metadata.length).isEqualTo(789);
      assertThat(metadata.lastTouchTimestamp).isEqualTo(123);
  
      metadata = all.get("name3");
      assertThat(metadata).isNull();
    }
  
    @Test
    public void insertAndRemove() throws DatabaseIOException {
      CacheFileMetadataIndex index = newInitializedIndex();
  
      index.set("name1", /* length= */ 123, /* lastTouchTimestamp= */ 456);
      index.set("name2", /* length= */ 789, /* lastTouchTimestamp= */ 123);
  
      index.remove("name1");
  
      Map<String, CacheFileMetadata> all = index.getAll();
      assertThat(all.size()).isEqualTo(1);
  
      CacheFileMetadata metadata = all.get("name1");
      assertThat(metadata).isNull();
  
      metadata = all.get("name2");
      assertThat(metadata).isNotNull();
      assertThat(metadata.length).isEqualTo(789);
      assertThat(metadata.lastTouchTimestamp).isEqualTo(123);
  
      index.remove("name2");
  
      all = index.getAll();
      assertThat(all).isEmpty();
  
      metadata = all.get("name2");
      assertThat(metadata).isNull();
    }
  
    @Test
    public void insertAndRemoveAll() throws DatabaseIOException {
      CacheFileMetadataIndex index = newInitializedIndex();
  
      index.set("name1", /* length= */ 123, /* lastTouchTimestamp= */ 456);
      index.set("name2", /* length= */ 789, /* lastTouchTimestamp= */ 123);
  
      HashSet<String> namesToRemove = new HashSet<>();
      namesToRemove.add("name1");
      namesToRemove.add("name2");
      index.removeAll(namesToRemove);
  
      Map<String, CacheFileMetadata> all = index.getAll();
      assertThat(all.isEmpty()).isTrue();
  
      CacheFileMetadata metadata = all.get("name1");
      assertThat(metadata).isNull();
  
      metadata = all.get("name2");
      assertThat(metadata).isNull();
    }
  
    @Test
    public void insertAndReplace() throws DatabaseIOException {
      CacheFileMetadataIndex index = newInitializedIndex();
  
      index.set("name1", /* length= */ 123, /* lastTouchTimestamp= */ 456);
      index.set("name1", /* length= */ 789, /* lastTouchTimestamp= */ 123);
  
      Map<String, CacheFileMetadata> all = index.getAll();
      assertThat(all.size()).isEqualTo(1);
  
      CacheFileMetadata metadata = all.get("name1");
      assertThat(metadata).isNotNull();
      assertThat(metadata.length).isEqualTo(789);
      assertThat(metadata.lastTouchTimestamp).isEqualTo(123);
    }
  
    private static CacheFileMetadataIndex newInitializedIndex() throws DatabaseIOException {
      CacheFileMetadataIndex index =
          new CacheFileMetadataIndex(TestUtil.getInMemoryDatabaseProvider());
      index.initialize(/* uid= */ 1234);
      return index;
    }
  }
  