Fix bug removing entries from CacheFileMetadataIndex

Issue: #6621
PiperOrigin-RevId: 284743414

library/core/src/main/java/com/google/android/exoplayer2/upstream/cache/CacheFileMetadataIndex.java

@@ -43,7 +43,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
   private static final int COLUMN_INDEX_LENGTH = 1;
   private static final int COLUMN_INDEX_LAST_TOUCH_TIMESTAMP = 2;
 
-  private static final String WHERE_NAME_EQUALS = COLUMN_INDEX_NAME + " = ?";
+  private static final String WHERE_NAME_EQUALS = COLUMN_NAME + " = ?";
 
   private static final String[] COLUMNS =
       new String[] {

library/core/src/test/java/com/google/android/exoplayer2/upstream/cache/CacheFileMetadataIndexTest.java

@@ -0,0 +1,135 @@
+/*
+ * 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;
+  }
+}