Simplify the ActionInputFileCache

Add a single getMetadata method (matching MetadataHandler), and rewrite
everything in those terms.

This is in preparation for merging ActionInputFileCache and MetadataHandler.

PiperOrigin-RevId: 161053535
diff --git a/src/test/java/com/google/devtools/build/lib/exec/SingleBuildFileCacheTest.java b/src/test/java/com/google/devtools/build/lib/exec/SingleBuildFileCacheTest.java
index 3087837..f9d0372 100644
--- a/src/test/java/com/google/devtools/build/lib/exec/SingleBuildFileCacheTest.java
+++ b/src/test/java/com/google/devtools/build/lib/exec/SingleBuildFileCacheTest.java
@@ -20,10 +20,10 @@
 import com.google.common.io.BaseEncoding;
 import com.google.devtools.build.lib.actions.ActionInput;
 import com.google.devtools.build.lib.actions.ActionInputHelper;
+import com.google.devtools.build.lib.actions.DigestOfDirectoryException;
 import com.google.devtools.build.lib.testutil.Suite;
 import com.google.devtools.build.lib.testutil.TestSpec;
 import com.google.devtools.build.lib.vfs.FileSystem;
-import com.google.devtools.build.lib.vfs.FileSystem.HashFunction;
 import com.google.devtools.build.lib.vfs.Path;
 import com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
 import com.google.protobuf.ByteString;
@@ -78,38 +78,43 @@
   }
 
   @Test
-  public void testExceptionsCached() throws Exception {
+  public void testNonExistentPath() throws Exception {
     ActionInput empty = ActionInputHelper.fromPath("/noexist");
-    IOException caught = null;
     try {
-      underTest.getDigest(empty);
+      underTest.getMetadata(empty);
       fail("non existent file should raise exception");
     } catch (IOException expected) {
-      caught = expected;
     }
+  }
+
+  @Test
+  public void testDirectory() throws Exception {
+    Path file = fs.getPath("/directory");
+    file.createDirectory();
+    ActionInput input = ActionInputHelper.fromPath(file.getPathString());
     try {
-      underTest.getSizeInBytes(empty);
-      fail("non existent file should raise exception.");
-    } catch (IOException expected) {
-      assertThat(expected).isSameAs(caught);
+      underTest.getMetadata(input);
+      fail("directory should raise exception");
+    } catch (DigestOfDirectoryException expected) {
+      assertThat(expected).hasMessageThat().isEqualTo("Input is a directory: /directory");
     }
   }
 
   @Test
   public void testCache() throws Exception {
     ActionInput empty = ActionInputHelper.fromPath("/empty");
-    underTest.getDigest(empty);
+    underTest.getMetadata(empty).getDigest();
     assert(calls.containsKey("/empty"));
     assertThat((int) calls.get("/empty")).isEqualTo(1);
-    underTest.getDigest(empty);
+    underTest.getMetadata(empty).getDigest();
     assertThat((int) calls.get("/empty")).isEqualTo(1);
   }
 
   @Test
   public void testBasic() throws Exception {
     ActionInput empty = ActionInputHelper.fromPath("/empty");
-    assertThat(underTest.getSizeInBytes(empty)).isEqualTo(0);
-    byte[] digestBytes = underTest.getDigest(empty);
+    assertThat(underTest.getMetadata(empty).getSize()).isEqualTo(0);
+    byte[] digestBytes = underTest.getMetadata(empty).getDigest();
     ByteString digest = ByteString.copyFromUtf8(
         BaseEncoding.base16().lowerCase().encode(digestBytes));
 
@@ -133,7 +138,7 @@
     Path file = fs.getPath("/unreadable");
     file.getOutputStream().close();
     file.chmod(0);
-    ByteString actualDigest = ByteString.copyFrom(underTest.getDigest(input));
+    ByteString actualDigest = ByteString.copyFrom(underTest.getMetadata(input).getDigest());
     assertThat(expectedDigest).isEqualTo(actualDigest);
   }
 }
diff --git a/src/test/java/com/google/devtools/build/lib/exec/SpawnInputExpanderTest.java b/src/test/java/com/google/devtools/build/lib/exec/SpawnInputExpanderTest.java
index 355e914..d577916 100644
--- a/src/test/java/com/google/devtools/build/lib/exec/SpawnInputExpanderTest.java
+++ b/src/test/java/com/google/devtools/build/lib/exec/SpawnInputExpanderTest.java
@@ -18,7 +18,6 @@
 
 import com.google.common.collect.Maps;
 import com.google.devtools.build.lib.actions.ActionInput;
-import com.google.devtools.build.lib.actions.ActionInputFileCache;
 import com.google.devtools.build.lib.actions.ActionInputHelper;
 import com.google.devtools.build.lib.actions.Artifact;
 import com.google.devtools.build.lib.actions.EmptyRunfilesSupplier;
@@ -26,6 +25,8 @@
 import com.google.devtools.build.lib.actions.RunfilesSupplier;
 import com.google.devtools.build.lib.analysis.Runfiles;
 import com.google.devtools.build.lib.analysis.RunfilesSupplierImpl;
+import com.google.devtools.build.lib.exec.util.FakeActionInputFileCache;
+import com.google.devtools.build.lib.skyframe.FileArtifactValue;
 import com.google.devtools.build.lib.vfs.FileSystem;
 import com.google.devtools.build.lib.vfs.FileSystemUtils;
 import com.google.devtools.build.lib.vfs.Path;
@@ -38,13 +39,14 @@
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
-import org.mockito.Mockito;
 
 /**
  * Tests for {@link SpawnInputExpander}.
  */
 @RunWith(JUnit4.class)
 public class SpawnInputExpanderTest {
+  private static final byte[] FAKE_DIGEST = new byte[] {1, 2, 3, 4};
+
   private FileSystem fs;
   private SpawnInputExpander expander;
   private Map<PathFragment, ActionInput> inputMappings;
@@ -75,8 +77,8 @@
         new Artifact(fs.getPath("/root/dir/file"), Root.asSourceRoot(fs.getPath("/root")));
     Runfiles runfiles = new Runfiles.Builder("workspace").addArtifact(artifact).build();
     RunfilesSupplier supplier = new RunfilesSupplierImpl(PathFragment.create("runfiles"), runfiles);
-    ActionInputFileCache mockCache = Mockito.mock(ActionInputFileCache.class);
-    Mockito.when(mockCache.isFile(artifact)).thenReturn(true);
+    FakeActionInputFileCache mockCache = new FakeActionInputFileCache();
+    mockCache.put(artifact, FileArtifactValue.createNormalFile(FAKE_DIGEST, 0));
 
     expander.addRunfilesToInputs(inputMappings, supplier, mockCache);
     assertThat(inputMappings).hasSize(1);
@@ -90,8 +92,8 @@
         new Artifact(fs.getPath("/root/dir/file"), Root.asSourceRoot(fs.getPath("/root")));
     Runfiles runfiles = new Runfiles.Builder("workspace").addArtifact(artifact).build();
     RunfilesSupplier supplier = new RunfilesSupplierImpl(PathFragment.create("runfiles"), runfiles);
-    ActionInputFileCache mockCache = Mockito.mock(ActionInputFileCache.class);
-    Mockito.when(mockCache.isFile(artifact)).thenReturn(false);
+    FakeActionInputFileCache mockCache = new FakeActionInputFileCache();
+    mockCache.put(artifact, FileArtifactValue.createDirectory(-1));
 
     try {
       expander.addRunfilesToInputs(inputMappings, supplier, mockCache);
@@ -107,8 +109,8 @@
         new Artifact(fs.getPath("/root/dir/file"), Root.asSourceRoot(fs.getPath("/root")));
     Runfiles runfiles = new Runfiles.Builder("workspace").addArtifact(artifact).build();
     RunfilesSupplier supplier = new RunfilesSupplierImpl(PathFragment.create("runfiles"), runfiles);
-    ActionInputFileCache mockCache = Mockito.mock(ActionInputFileCache.class);
-    Mockito.when(mockCache.isFile(artifact)).thenReturn(false);
+    FakeActionInputFileCache mockCache = new FakeActionInputFileCache();
+    mockCache.put(artifact, FileArtifactValue.createDirectory(-1));
 
     expander = new SpawnInputExpander(/*strict=*/false);
     expander.addRunfilesToInputs(inputMappings, supplier, mockCache);
@@ -128,9 +130,9 @@
         .addArtifact(artifact2)
         .build();
     RunfilesSupplier supplier = new RunfilesSupplierImpl(PathFragment.create("runfiles"), runfiles);
-    ActionInputFileCache mockCache = Mockito.mock(ActionInputFileCache.class);
-    Mockito.when(mockCache.isFile(artifact1)).thenReturn(true);
-    Mockito.when(mockCache.isFile(artifact2)).thenReturn(true);
+    FakeActionInputFileCache mockCache = new FakeActionInputFileCache();
+    mockCache.put(artifact1, FileArtifactValue.createNormalFile(FAKE_DIGEST, 1));
+    mockCache.put(artifact2, FileArtifactValue.createNormalFile(FAKE_DIGEST, 2));
 
     expander.addRunfilesToInputs(inputMappings, supplier, mockCache);
     assertThat(inputMappings).hasSize(2);
@@ -147,8 +149,8 @@
     Runfiles runfiles = new Runfiles.Builder("workspace")
         .addSymlink(PathFragment.create("symlink"), artifact).build();
     RunfilesSupplier supplier = new RunfilesSupplierImpl(PathFragment.create("runfiles"), runfiles);
-    ActionInputFileCache mockCache = Mockito.mock(ActionInputFileCache.class);
-    Mockito.when(mockCache.isFile(artifact)).thenReturn(true);
+    FakeActionInputFileCache mockCache = new FakeActionInputFileCache();
+    mockCache.put(artifact, FileArtifactValue.createNormalFile(FAKE_DIGEST, 1));
 
     expander.addRunfilesToInputs(inputMappings, supplier, mockCache);
     assertThat(inputMappings).hasSize(1);
@@ -163,8 +165,8 @@
     Runfiles runfiles = new Runfiles.Builder("workspace")
         .addRootSymlink(PathFragment.create("symlink"), artifact).build();
     RunfilesSupplier supplier = new RunfilesSupplierImpl(PathFragment.create("runfiles"), runfiles);
-    ActionInputFileCache mockCache = Mockito.mock(ActionInputFileCache.class);
-    Mockito.when(mockCache.isFile(artifact)).thenReturn(true);
+    FakeActionInputFileCache mockCache = new FakeActionInputFileCache();
+    mockCache.put(artifact, FileArtifactValue.createNormalFile(FAKE_DIGEST, 1));
 
     expander.addRunfilesToInputs(inputMappings, supplier, mockCache);
     assertThat(inputMappings).hasSize(2);
diff --git a/src/test/java/com/google/devtools/build/lib/exec/util/FakeActionInputFileCache.java b/src/test/java/com/google/devtools/build/lib/exec/util/FakeActionInputFileCache.java
new file mode 100644
index 0000000..ac5f9a4
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/exec/util/FakeActionInputFileCache.java
@@ -0,0 +1,58 @@
+// Copyright 2017 The Bazel Authors. All rights reserved.
+//
+// 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.devtools.build.lib.exec.util;
+
+import com.google.common.base.Preconditions;
+import com.google.devtools.build.lib.actions.ActionInput;
+import com.google.devtools.build.lib.actions.ActionInputFileCache;
+import com.google.devtools.build.lib.actions.cache.Metadata;
+import com.google.devtools.build.lib.vfs.Path;
+import com.google.protobuf.ByteString;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import javax.annotation.Nullable;
+
+/** A fake implementation of the {@link ActionInputFileCache} interface. */
+public final class FakeActionInputFileCache implements ActionInputFileCache {
+  private final Map<ActionInput, Metadata> inputs = new HashMap<>();
+
+  public FakeActionInputFileCache() {
+  }
+
+  public void put(ActionInput artifact, Metadata metadata) {
+    inputs.put(artifact, metadata);
+  }
+
+  @Override
+  public Metadata getMetadata(ActionInput input) throws IOException {
+    return Preconditions.checkNotNull(inputs.get(input));
+  }
+
+  @Override
+  public boolean contentsAvailableLocally(ByteString digest) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  @Nullable
+  public ActionInput getInputFromDigest(ByteString hexDigest) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public Path getInputPath(ActionInput input) {
+    throw new UnsupportedOperationException();
+  }
+}
\ No newline at end of file