From 4abd6c30f99635b803b9170baa3de1e3f3b2859d Mon Sep 17 00:00:00 2001
From: ulfjack <ulfjack@google.com>
Date: Thu, 21 Dec 2017 10:52:16 -0800
Subject: Move FileStateValue.Type to Metadata; add Metadata.getType()

This is in preparation for merging FileArtifactValue and FileStateValue.

Progress on #3360.

PiperOrigin-RevId: 179832948
---
 .../build/lib/skyframe/FileStateValue.java         | 83 +++++++++++++---------
 1 file changed, 48 insertions(+), 35 deletions(-)

(limited to 'src/main/java/com/google/devtools/build/lib/skyframe/FileStateValue.java')

diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/FileStateValue.java b/src/main/java/com/google/devtools/build/lib/skyframe/FileStateValue.java
index c309b427ad..2595663fd4 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/FileStateValue.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/FileStateValue.java
@@ -14,7 +14,9 @@
 package com.google.devtools.build.lib.skyframe;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
+import com.google.devtools.build.lib.actions.FileStateType;
 import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
 import com.google.devtools.build.lib.util.io.TimestampGranularityMonitor;
 import com.google.devtools.build.lib.vfs.FileStatus;
@@ -33,10 +35,10 @@ import java.util.Objects;
 import javax.annotation.Nullable;
 
 /**
- * Encapsulates the filesystem operations needed to get state for a path. This is at least a
- * 'lstat' to determine what type of file the path is.
+ * Encapsulates the filesystem operations needed to get state for a path. This is equivalent to an
+ * 'lstat' that does not follow symlinks to determine what type of file the path is.
  * <ul>
- *   <li> For a non-existent file, the non existence is noted.
+ *   <li> For a non-existent file, the non-existence is noted.
  *   <li> For a symlink, the symlink target is noted.
  *   <li> For a directory, the existence is noted.
  *   <li> For a file, the existence is noted, along with metadata about the file (e.g.
@@ -58,15 +60,6 @@ public abstract class FileStateValue implements SkyValue {
   public static final NonexistentFileStateValue NONEXISTENT_FILE_STATE_NODE =
       new NonexistentFileStateValue();
 
-  /** Type of a path. */
-  public enum Type {
-    REGULAR_FILE,
-    SPECIAL_FILE,
-    DIRECTORY,
-    SYMLINK,
-    NONEXISTENT,
-  }
-
   protected FileStateValue() {
   }
 
@@ -106,8 +99,9 @@ public abstract class FileStateValue implements SkyValue {
     return LegacySkyKey.create(SkyFunctions.FILE_STATE, rootedPath);
   }
 
-  public abstract Type getType();
+  public abstract FileStateType getType();
 
+  /** Returns the target of the symlink, or throws an exception if this is not a symlink. */
   PathFragment getSymlinkTarget() {
     throw new IllegalStateException();
   }
@@ -205,8 +199,8 @@ public abstract class FileStateValue implements SkyValue {
     }
 
     @Override
-    public Type getType() {
-      return Type.REGULAR_FILE;
+    public FileStateType getType() {
+      return FileStateType.REGULAR_FILE;
     }
 
     @Override
@@ -230,12 +224,17 @@ public abstract class FileStateValue implements SkyValue {
 
     @Override
     public boolean equals(Object obj) {
-      if (obj instanceof RegularFileStateValue) {
-        RegularFileStateValue other = (RegularFileStateValue) obj;
-        return size == other.size && mtime == other.mtime && Arrays.equals(digest, other.digest)
-            && Objects.equals(contentsProxy, other.contentsProxy);
+      if (obj == this) {
+        return true;
       }
-      return false;
+      if (!(obj instanceof RegularFileStateValue)) {
+        return false;
+      }
+      RegularFileStateValue other = (RegularFileStateValue) obj;
+      return size == other.size
+          && mtime == other.mtime
+          && Arrays.equals(digest, other.digest)
+          && Objects.equals(contentsProxy, other.contentsProxy);
     }
 
     @Override
@@ -243,6 +242,15 @@ public abstract class FileStateValue implements SkyValue {
       return Objects.hash(size, mtime, Arrays.hashCode(digest), contentsProxy);
     }
 
+    @Override
+    public String toString() {
+      return MoreObjects.toStringHelper(this)
+          .add("digest", digest)
+          .add("size", size)
+          .add("mtime", mtime)
+          .add("contentsProxy", contentsProxy).toString();
+    }
+
     @Override
     public String prettyPrint() {
       String contents = digest != null
@@ -261,11 +269,10 @@ public abstract class FileStateValue implements SkyValue {
       this.contentsProxy = contentsProxy;
     }
 
-    static SpecialFileStateValue fromStat(PathFragment path, FileStatusWithDigest stat,
+    static SpecialFileStateValue fromStat(PathFragment path, FileStatus stat,
         @Nullable TimestampGranularityMonitor tsgm) throws IOException {
       long mtime = stat.getLastModifiedTime();
-      // Note that TimestampGranularityMonitor#notifyDependenceOnFileTime is a thread-safe
-      // method.
+      // Note that TimestampGranularityMonitor#notifyDependenceOnFileTime is a thread-safe method.
       if (tsgm != null) {
         tsgm.notifyDependenceOnFileTime(path, mtime);
       }
@@ -273,8 +280,8 @@ public abstract class FileStateValue implements SkyValue {
     }
 
     @Override
-    public Type getType() {
-      return Type.SPECIAL_FILE;
+    public FileStateType getType() {
+      return FileStateType.SPECIAL_FILE;
     }
 
     @Override
@@ -294,11 +301,14 @@ public abstract class FileStateValue implements SkyValue {
 
     @Override
     public boolean equals(Object obj) {
-      if (obj instanceof SpecialFileStateValue) {
-        SpecialFileStateValue other = (SpecialFileStateValue) obj;
-        return Objects.equals(contentsProxy, other.contentsProxy);
+      if (obj == this) {
+        return true;
       }
-      return false;
+      if (!(obj instanceof SpecialFileStateValue)) {
+        return false;
+      }
+      SpecialFileStateValue other = (SpecialFileStateValue) obj;
+      return Objects.equals(contentsProxy, other.contentsProxy);
     }
 
     @Override
@@ -319,8 +329,8 @@ public abstract class FileStateValue implements SkyValue {
     }
 
     @Override
-    public Type getType() {
-      return Type.DIRECTORY;
+    public FileStateType getType() {
+      return FileStateType.DIRECTORY;
     }
 
     @Override
@@ -350,8 +360,8 @@ public abstract class FileStateValue implements SkyValue {
     }
 
     @Override
-    public Type getType() {
-      return Type.SYMLINK;
+    public FileStateType getType() {
+      return FileStateType.SYMLINK;
     }
 
     @Override
@@ -386,8 +396,8 @@ public abstract class FileStateValue implements SkyValue {
     }
 
     @Override
-    public Type getType() {
-      return Type.NONEXISTENT;
+    public FileStateType getType() {
+      return FileStateType.NONEXISTENT;
     }
 
     @Override
@@ -398,6 +408,9 @@ public abstract class FileStateValue implements SkyValue {
     // This object is normally a singleton, but deserialization produces copies.
     @Override
     public boolean equals(Object obj) {
+      if (obj == this) {
+        return true;
+      }
       return obj instanceof NonexistentFileStateValue;
     }
 
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