Extract boilerplate logic from ParallelEvaluator's SkyFunction.Environment implementation.

This slightly shortens the massive ParallelEvaluator file, and also allows alternate Environment implementations to avoid repeating the boilerplate.

--
MOS_MIGRATED_REVID=90830529
diff --git a/src/main/java/com/google/devtools/build/skyframe/AbstractSkyFunctionEnvironment.java b/src/main/java/com/google/devtools/build/skyframe/AbstractSkyFunctionEnvironment.java
new file mode 100644
index 0000000..b8b5a76
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/skyframe/AbstractSkyFunctionEnvironment.java
@@ -0,0 +1,251 @@
+// Copyright 2015 Google Inc. 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.skyframe;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Function;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Maps;
+import com.google.devtools.build.skyframe.ValueOrExceptionUtils.BottomException;
+
+import java.util.Collections;
+import java.util.Map;
+import java.util.Set;
+
+import javax.annotation.Nullable;
+
+/**
+ * Basic implementation of {@link SkyFunction.Environment} in which all convenience methods delegate
+ * to a single abstract method.
+ */
+@VisibleForTesting
+public abstract class AbstractSkyFunctionEnvironment implements SkyFunction.Environment {
+  protected boolean valuesMissing = false;
+  private <E extends Exception> ValueOrException<E> getValueOrException(SkyKey depKey,
+      Class<E> exceptionClass) {
+    return ValueOrExceptionUtils.downcovert(getValueOrException(depKey, exceptionClass,
+        BottomException.class), exceptionClass);
+  }
+
+  private <E1 extends Exception, E2 extends Exception> ValueOrException2<E1, E2>
+  getValueOrException(SkyKey depKey, Class<E1> exceptionClass1, Class<E2> exceptionClass2) {
+    return ValueOrExceptionUtils.downconvert(getValueOrException(depKey, exceptionClass1,
+        exceptionClass2, BottomException.class), exceptionClass1, exceptionClass2);
+  }
+
+  private <E1 extends Exception, E2 extends Exception, E3 extends Exception>
+  ValueOrException3<E1, E2, E3> getValueOrException(SkyKey depKey, Class<E1> exceptionClass1,
+      Class<E2> exceptionClass2, Class<E3> exceptionClass3) {
+    return ValueOrExceptionUtils.downconvert(getValueOrException(depKey, exceptionClass1,
+            exceptionClass2, exceptionClass3, BottomException.class), exceptionClass1,
+        exceptionClass2, exceptionClass3);
+  }
+
+  private <E1 extends Exception, E2 extends Exception, E3 extends Exception,
+      E4 extends Exception> ValueOrException4<E1, E2, E3, E4> getValueOrException(SkyKey depKey,
+      Class<E1> exceptionClass1, Class<E2> exceptionClass2, Class<E3> exceptionClass3,
+      Class<E4> exceptionClass4) {
+    return getValueOrExceptions(ImmutableSet.of(depKey), exceptionClass1, exceptionClass2,
+        exceptionClass3, exceptionClass4).get(depKey);
+  }
+
+  private <E1 extends Exception, E2 extends Exception, E3 extends Exception,
+      E4 extends Exception> Map<SkyKey, ValueOrException4<E1, E2, E3, E4>> getValueOrExceptions(
+      Set<SkyKey> depKeys, Class<E1> exceptionClass1, Class<E2> exceptionClass2,
+      Class<E3> exceptionClass3, Class<E4> exceptionClass4) {
+    SkyFunctionException.validateExceptionType(exceptionClass1);
+    SkyFunctionException.validateExceptionType(exceptionClass2);
+    SkyFunctionException.validateExceptionType(exceptionClass3);
+    SkyFunctionException.validateExceptionType(exceptionClass4);
+    Map<SkyKey, ValueOrUntypedException> valueOrExceptions =
+        getValueOrUntypedExceptions(depKeys);
+    ImmutableMap.Builder<SkyKey, ValueOrException4<E1, E2, E3, E4>> builder =
+        ImmutableMap.builder();
+    for (SkyKey depKey : depKeys) {
+      ValueOrUntypedException voe = valueOrExceptions.get(depKey);
+      SkyValue value = voe.getValue();
+      if (value != null) {
+        builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofValue(value));
+        continue;
+      }
+      Exception e = voe.getException();
+      if (e != null) {
+        if (exceptionClass1.isInstance(e)) {
+          builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofExn1(
+              exceptionClass1.cast(e)));
+          continue;
+        }
+        if (exceptionClass2.isInstance(e)) {
+          builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofExn2(
+              exceptionClass2.cast(e)));
+          continue;
+        }
+        if (exceptionClass3.isInstance(e)) {
+          builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofExn3(
+              exceptionClass3.cast(e)));
+          continue;
+        }
+        if (exceptionClass4.isInstance(e)) {
+          builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofExn4(
+              exceptionClass4.cast(e)));
+          continue;
+        }
+      }
+      valuesMissing = true;
+      builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofNullValue());
+    }
+    return builder.build();
+  }
+
+  /** Implementations should set {@link #valuesMissing} as necessary. */
+  protected abstract Map<SkyKey, ValueOrUntypedException> getValueOrUntypedExceptions(
+      Iterable<SkyKey> depKeys);
+
+  @Override
+  @Nullable
+  public SkyValue getValue(SkyKey depKey) {
+    try {
+      return getValueOrThrow(depKey, BottomException.class);
+    } catch (BottomException e) {
+      throw new IllegalStateException("shouldn't reach here");
+    }
+  }
+
+  @Override
+  @Nullable
+  public <E extends Exception> SkyValue getValueOrThrow(SkyKey depKey, Class<E> exceptionClass)
+      throws E {
+    return getValueOrException(depKey, exceptionClass).get();
+  }
+
+  @Override
+  @Nullable
+  public <E1 extends Exception, E2 extends Exception> SkyValue getValueOrThrow(SkyKey depKey,
+      Class<E1> exceptionClass1, Class<E2> exceptionClass2) throws E1, E2 {
+    return getValueOrException(depKey, exceptionClass1, exceptionClass2).get();
+  }
+
+  @Override
+  @Nullable
+  public <E1 extends Exception, E2 extends Exception,
+      E3 extends Exception> SkyValue getValueOrThrow(SkyKey depKey, Class<E1> exceptionClass1,
+      Class<E2> exceptionClass2, Class<E3> exceptionClass3) throws E1, E2, E3 {
+    return getValueOrException(depKey, exceptionClass1, exceptionClass2, exceptionClass3).get();
+  }
+
+  @Override
+  public <E1 extends Exception, E2 extends Exception, E3 extends Exception,
+      E4 extends Exception> SkyValue getValueOrThrow(SkyKey depKey, Class<E1> exceptionClass1,
+      Class<E2> exceptionClass2, Class<E3> exceptionClass3, Class<E4> exceptionClass4) throws E1,
+      E2, E3, E4 {
+    return getValueOrException(depKey, exceptionClass1, exceptionClass2, exceptionClass3,
+        exceptionClass4).get();
+  }
+
+  @Override
+  public Map<SkyKey, SkyValue> getValues(Iterable<SkyKey> depKeys) {
+    return Maps.transformValues(getValuesOrThrow(depKeys, BottomException.class),
+        GET_VALUE_FROM_VOE);
+  }
+
+  @Override
+  public <E extends Exception> Map<SkyKey, ValueOrException<E>> getValuesOrThrow(
+      Iterable<SkyKey> depKeys, Class<E> exceptionClass) {
+    return Maps.transformValues(getValuesOrThrow(depKeys, exceptionClass, BottomException.class),
+        makeSafeDowncastToVOEFunction(exceptionClass));
+  }
+
+  @Override
+  public <E1 extends Exception,
+      E2 extends Exception> Map<SkyKey, ValueOrException2<E1, E2>> getValuesOrThrow(
+      Iterable<SkyKey> depKeys, Class<E1> exceptionClass1, Class<E2> exceptionClass2) {
+    return Maps.transformValues(getValuesOrThrow(depKeys, exceptionClass1, exceptionClass2,
+        BottomException.class), makeSafeDowncastToVOE2Function(exceptionClass1,
+        exceptionClass2));
+  }
+
+  @Override
+  public <E1 extends Exception, E2 extends Exception, E3 extends Exception> Map<SkyKey,
+      ValueOrException3<E1, E2, E3>> getValuesOrThrow(Iterable<SkyKey> depKeys,
+      Class<E1> exceptionClass1, Class<E2> exceptionClass2, Class<E3> exceptionClass3) {
+    return Maps.transformValues(getValuesOrThrow(depKeys, exceptionClass1, exceptionClass2,
+        exceptionClass3, BottomException.class), makeSafeDowncastToVOE3Function(exceptionClass1,
+        exceptionClass2, exceptionClass3));
+  }
+
+  @Override
+  public <E1 extends Exception, E2 extends Exception, E3 extends Exception,
+      E4 extends Exception> Map<SkyKey, ValueOrException4<E1, E2, E3, E4>> getValuesOrThrow(
+      Iterable<SkyKey> depKeys, Class<E1> exceptionClass1, Class<E2> exceptionClass2,
+      Class<E3> exceptionClass3, Class<E4> exceptionClass4) {
+    Set<SkyKey> keys = ImmutableSet.copyOf(depKeys);
+    Map<SkyKey, ValueOrException4<E1, E2, E3, E4>> result = getValueOrExceptions(keys,
+        exceptionClass1, exceptionClass2, exceptionClass3, exceptionClass4);
+    return Collections.unmodifiableMap(result);
+  }
+
+
+  @Override
+  public boolean valuesMissing() {
+    return valuesMissing;
+  }
+
+  private static final Function<ValueOrException<BottomException>, SkyValue> GET_VALUE_FROM_VOE =
+      new Function<ValueOrException<BottomException>, SkyValue>() {
+        @Override
+        public SkyValue apply(ValueOrException<BottomException> voe) {
+          return ValueOrExceptionUtils.downcovert(voe);
+        }
+      };
+
+  private static <E extends Exception>
+  Function<ValueOrException2<E, BottomException>, ValueOrException<E>>
+  makeSafeDowncastToVOEFunction(final Class<E> exceptionClass) {
+    return new Function<ValueOrException2<E, BottomException>, ValueOrException<E>>() {
+      @Override
+      public ValueOrException<E> apply(ValueOrException2<E, BottomException> voe) {
+        return ValueOrExceptionUtils.downcovert(voe, exceptionClass);
+      }
+    };
+  }
+
+  private static <E1 extends Exception, E2 extends Exception>
+  Function<ValueOrException3<E1, E2, BottomException>, ValueOrException2<E1, E2>>
+  makeSafeDowncastToVOE2Function(final Class<E1> exceptionClass1,
+      final Class<E2> exceptionClass2) {
+    return new Function<ValueOrException3<E1, E2, BottomException>,
+        ValueOrException2<E1, E2>>() {
+      @Override
+      public ValueOrException2<E1, E2> apply(ValueOrException3<E1, E2, BottomException> voe) {
+        return ValueOrExceptionUtils.downconvert(voe, exceptionClass1, exceptionClass2);
+      }
+    };
+  }
+
+  private static <E1 extends Exception, E2 extends Exception, E3 extends Exception>
+  Function<ValueOrException4<E1, E2, E3, BottomException>, ValueOrException3<E1, E2, E3>>
+  makeSafeDowncastToVOE3Function(final Class<E1> exceptionClass1,
+      final Class<E2> exceptionClass2, final Class<E3> exceptionClass3) {
+    return new Function<ValueOrException4<E1, E2, E3, BottomException>,
+        ValueOrException3<E1, E2, E3>>() {
+      @Override
+      public ValueOrException3<E1, E2, E3> apply(ValueOrException4<E1, E2, E3,
+          BottomException> voe) {
+        return ValueOrExceptionUtils.downconvert(voe, exceptionClass1, exceptionClass2,
+            exceptionClass3);
+      }
+    };
+  }
+}
diff --git a/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluator.java b/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluator.java
index 034e19f..cf76949 100644
--- a/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluator.java
+++ b/src/main/java/com/google/devtools/build/skyframe/ParallelEvaluator.java
@@ -13,7 +13,6 @@
 // limitations under the License.
 package com.google.devtools.build.skyframe;
 
-import com.google.common.base.Function;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Predicate;
 import com.google.common.base.Predicates;
@@ -24,7 +23,6 @@
 import com.google.common.collect.Interner;
 import com.google.common.collect.Interners;
 import com.google.common.collect.Iterables;
-import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import com.google.devtools.build.lib.collect.nestedset.NestedSet;
@@ -44,7 +42,6 @@
 import com.google.devtools.build.skyframe.NodeEntry.DependencyState;
 import com.google.devtools.build.skyframe.Scheduler.SchedulerException;
 import com.google.devtools.build.skyframe.SkyFunctionException.ReifiedSkyFunctionException;
-import com.google.devtools.build.skyframe.ValueOrExceptionUtils.BottomException;
 
 import java.util.ArrayDeque;
 import java.util.ArrayList;
@@ -161,9 +158,8 @@
   /**
    * A suitable {@link SkyFunction.Environment} implementation.
    */
-  class SkyFunctionEnvironment implements SkyFunction.Environment {
+  class SkyFunctionEnvironment extends AbstractSkyFunctionEnvironment {
     private boolean building = true;
-    private boolean valuesMissing = false;
     private SkyKey depErrorKey = null;
     private final SkyKey skyKey;
     private SkyValue value = null;
@@ -284,8 +280,9 @@
       this.errorInfo = Preconditions.checkNotNull(errorInfo, skyKey);
     }
 
-    private ImmutableMap<SkyKey, ValueOrUntypedException> getValueOrUntypedExceptions(
-        Set<SkyKey> depKeys) {
+    @Override
+    protected ImmutableMap<SkyKey, ValueOrUntypedException> getValueOrUntypedExceptions(
+        Iterable<SkyKey> depKeys) {
       checkActive();
       Set<SkyKey> keys = new LinkedHashSet<>();
       for (SkyKey depKey : depKeys) {
@@ -373,165 +370,16 @@
       return builder.build();
     }
 
-    private <E extends Exception> ValueOrException<E> getValueOrException(SkyKey depKey,
-        Class<E> exceptionClass) {
-      return ValueOrExceptionUtils.downcovert(getValueOrException(depKey, exceptionClass,
-          BottomException.class), exceptionClass);
-    }
-
-    private <E1 extends Exception, E2 extends Exception> ValueOrException2<E1, E2>
-        getValueOrException(SkyKey depKey, Class<E1> exceptionClass1, Class<E2> exceptionClass2) {
-      return ValueOrExceptionUtils.downconvert(getValueOrException(depKey, exceptionClass1,
-          exceptionClass2, BottomException.class), exceptionClass1, exceptionClass2);
-    }
-
-    private <E1 extends Exception, E2 extends Exception, E3 extends Exception>
-    ValueOrException3<E1, E2, E3> getValueOrException(SkyKey depKey, Class<E1> exceptionClass1,
-            Class<E2> exceptionClass2, Class<E3> exceptionClass3) {
-      return ValueOrExceptionUtils.downconvert(getValueOrException(depKey, exceptionClass1,
-          exceptionClass2, exceptionClass3, BottomException.class), exceptionClass1,
-          exceptionClass2, exceptionClass3);
-    }
-
-    private <E1 extends Exception, E2 extends Exception, E3 extends Exception,
-        E4 extends Exception> ValueOrException4<E1, E2, E3, E4> getValueOrException(SkyKey depKey,
-        Class<E1> exceptionClass1, Class<E2> exceptionClass2, Class<E3> exceptionClass3,
-        Class<E4> exceptionClass4) {
-      return getValueOrExceptions(ImmutableSet.of(depKey), exceptionClass1, exceptionClass2,
-          exceptionClass3, exceptionClass4).get(depKey);
-    }
-
-    private <E1 extends Exception, E2 extends Exception, E3 extends Exception,
-        E4 extends Exception> Map<SkyKey, ValueOrException4<E1, E2, E3, E4>> getValueOrExceptions(
-        Set<SkyKey> depKeys, Class<E1> exceptionClass1, Class<E2> exceptionClass2,
-        Class<E3> exceptionClass3, Class<E4> exceptionClass4) {
-      SkyFunctionException.validateExceptionType(exceptionClass1);
-      SkyFunctionException.validateExceptionType(exceptionClass2);
-      SkyFunctionException.validateExceptionType(exceptionClass3);
-      SkyFunctionException.validateExceptionType(exceptionClass4);
-      Map<SkyKey, ValueOrUntypedException> valueOrExceptions =
-          getValueOrUntypedExceptions(depKeys);
-      ImmutableMap.Builder<SkyKey, ValueOrException4<E1, E2, E3, E4>> builder =
-          ImmutableMap.builder();
-      for (SkyKey depKey : depKeys) {
-        ValueOrUntypedException voe = valueOrExceptions.get(depKey);
-        SkyValue value = voe.getValue();
-        if (value != null) {
-          builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofValue(value));
-          continue;
-        }
-        Exception e = voe.getException();
-        if (e != null) {
-          if (exceptionClass1.isInstance(e)) {
-            builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofExn1(
-                exceptionClass1.cast(e)));
-            continue;
-          }
-          if (exceptionClass2.isInstance(e)) {
-            builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofExn2(
-                exceptionClass2.cast(e)));
-            continue;
-          }
-          if (exceptionClass3.isInstance(e)) {
-            builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofExn3(
-                exceptionClass3.cast(e)));
-            continue;
-          }
-          if (exceptionClass4.isInstance(e)) {
-            builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofExn4(
-                exceptionClass4.cast(e)));
-            continue;
-          }
-        }
-        valuesMissing = true;
-        builder.put(depKey, ValueOrExceptionUtils.<E1, E2, E3, E4>ofNullValue());
-      }
-      return builder.build();
-    }
-
-    @Override
-    @Nullable
-    public SkyValue getValue(SkyKey depKey) {
-      try {
-        return getValueOrThrow(depKey, BottomException.class);
-      } catch (BottomException e) {
-        throw new IllegalStateException("shouldn't reach here");
-      }
-    }
-
-    @Override
-    @Nullable
-    public <E extends Exception> SkyValue getValueOrThrow(SkyKey depKey, Class<E> exceptionClass)
-        throws E {
-      return getValueOrException(depKey, exceptionClass).get();
-    }
-
-    @Override
-    @Nullable
-    public <E1 extends Exception, E2 extends Exception> SkyValue getValueOrThrow(SkyKey depKey,
-        Class<E1> exceptionClass1, Class<E2> exceptionClass2) throws E1, E2 {
-      return getValueOrException(depKey, exceptionClass1, exceptionClass2).get();
-    }
-
-    @Override
-    @Nullable
-    public <E1 extends Exception, E2 extends Exception,
-        E3 extends Exception> SkyValue getValueOrThrow(SkyKey depKey, Class<E1> exceptionClass1,
-        Class<E2> exceptionClass2, Class<E3> exceptionClass3) throws E1, E2, E3 {
-      return getValueOrException(depKey, exceptionClass1, exceptionClass2, exceptionClass3).get();
-    }
-
-    @Override
-    public <E1 extends Exception, E2 extends Exception, E3 extends Exception,
-        E4 extends Exception> SkyValue getValueOrThrow(SkyKey depKey, Class<E1> exceptionClass1,
-        Class<E2> exceptionClass2, Class<E3> exceptionClass3, Class<E4> exceptionClass4) throws E1,
-        E2, E3, E4 {
-      return getValueOrException(depKey, exceptionClass1, exceptionClass2, exceptionClass3,
-          exceptionClass4).get();
-    }
-
-    @Override
-    public Map<SkyKey, SkyValue> getValues(Iterable<SkyKey> depKeys) {
-      return Maps.transformValues(getValuesOrThrow(depKeys, BottomException.class),
-          GET_VALUE_FROM_VOE);
-    }
-
-    @Override
-    public <E extends Exception> Map<SkyKey, ValueOrException<E>> getValuesOrThrow(
-        Iterable<SkyKey> depKeys, Class<E> exceptionClass) {
-      return Maps.transformValues(getValuesOrThrow(depKeys, exceptionClass, BottomException.class),
-          makeSafeDowncastToVOEFunction(exceptionClass));
-    }
-
-    @Override
-    public <E1 extends Exception,
-        E2 extends Exception> Map<SkyKey, ValueOrException2<E1, E2>> getValuesOrThrow(
-        Iterable<SkyKey> depKeys, Class<E1> exceptionClass1, Class<E2> exceptionClass2) {
-      return Maps.transformValues(getValuesOrThrow(depKeys, exceptionClass1, exceptionClass2,
-          BottomException.class), makeSafeDowncastToVOE2Function(exceptionClass1,
-              exceptionClass2));
-    }
-
-    @Override
-    public <E1 extends Exception, E2 extends Exception, E3 extends Exception> Map<SkyKey,
-        ValueOrException3<E1, E2, E3>> getValuesOrThrow(Iterable<SkyKey> depKeys,
-        Class<E1> exceptionClass1, Class<E2> exceptionClass2, Class<E3> exceptionClass3) {
-      return Maps.transformValues(getValuesOrThrow(depKeys, exceptionClass1, exceptionClass2,
-          exceptionClass3, BottomException.class), makeSafeDowncastToVOE3Function(exceptionClass1,
-              exceptionClass2, exceptionClass3));
-    }
-
     @Override
     public <E1 extends Exception, E2 extends Exception, E3 extends Exception,
         E4 extends Exception> Map<SkyKey, ValueOrException4<E1, E2, E3, E4>> getValuesOrThrow(
         Iterable<SkyKey> depKeys, Class<E1> exceptionClass1, Class<E2> exceptionClass2,
         Class<E3> exceptionClass3, Class<E4> exceptionClass4) {
-      Set<SkyKey> keys = ImmutableSet.copyOf(depKeys);
       newlyRequestedDeps.startGroup();
-      Map<SkyKey, ValueOrException4<E1, E2, E3, E4>> result = getValueOrExceptions(keys,
-          exceptionClass1, exceptionClass2, exceptionClass3, exceptionClass4);
+      Map<SkyKey, ValueOrException4<E1, E2, E3, E4>> result = super.getValuesOrThrow(
+          depKeys, exceptionClass1, exceptionClass2, exceptionClass3, exceptionClass4);
       newlyRequestedDeps.endGroup();
-      return Collections.unmodifiableMap(result);
+      return result;
     }
 
     private void addDep(SkyKey key) {
@@ -541,11 +389,6 @@
       }
     }
 
-    @Override
-    public boolean valuesMissing() {
-      return valuesMissing;
-    }
-
     /**
      * If {@code !keepGoing} and there is at least one dep in error, returns a dep in error.
      * Otherwise returns {@code null}.
@@ -650,53 +493,6 @@
     }
   }
 
-  private static final Function<ValueOrException<BottomException>, SkyValue> GET_VALUE_FROM_VOE =
-      new Function<ValueOrException<BottomException>, SkyValue>() {
-    @Override
-    public SkyValue apply(ValueOrException<BottomException> voe) {
-      return ValueOrExceptionUtils.downcovert(voe);
-    }
-  };
-
-  private static <E extends Exception>
-      Function<ValueOrException2<E, BottomException>, ValueOrException<E>>
-      makeSafeDowncastToVOEFunction(final Class<E> exceptionClass) {
-    return new Function<ValueOrException2<E, BottomException>, ValueOrException<E>>() {
-      @Override
-      public ValueOrException<E> apply(ValueOrException2<E, BottomException> voe) {
-        return ValueOrExceptionUtils.downcovert(voe, exceptionClass);
-      }
-    };
-  }
-
-  private static <E1 extends Exception, E2 extends Exception>
-      Function<ValueOrException3<E1, E2, BottomException>, ValueOrException2<E1, E2>>
-      makeSafeDowncastToVOE2Function(final Class<E1> exceptionClass1,
-      final Class<E2> exceptionClass2) {
-    return new Function<ValueOrException3<E1, E2, BottomException>,
-        ValueOrException2<E1, E2>>() {
-      @Override
-      public ValueOrException2<E1, E2> apply(ValueOrException3<E1, E2, BottomException> voe) {
-        return ValueOrExceptionUtils.downconvert(voe, exceptionClass1, exceptionClass2);
-      }
-    };
-  }
-
-  private static <E1 extends Exception, E2 extends Exception, E3 extends Exception>
-      Function<ValueOrException4<E1, E2, E3, BottomException>, ValueOrException3<E1, E2, E3>>
-      makeSafeDowncastToVOE3Function(final Class<E1> exceptionClass1,
-          final Class<E2> exceptionClass2, final Class<E3> exceptionClass3) {
-    return new Function<ValueOrException4<E1, E2, E3, BottomException>,
-        ValueOrException3<E1, E2, E3>>() {
-      @Override
-      public ValueOrException3<E1, E2, E3> apply(ValueOrException4<E1, E2, E3,
-          BottomException> voe) {
-        return ValueOrExceptionUtils.downconvert(voe, exceptionClass1, exceptionClass2,
-            exceptionClass3);
-      }
-    };
-  }
-
   private class ValueVisitor extends AbstractQueueVisitor {
     private AtomicBoolean preventNewEvaluations = new AtomicBoolean(false);
     private final Set<SkyKey> inflightNodes = Sets.newConcurrentHashSet();
@@ -923,7 +719,7 @@
       GroupedListHelper<SkyKey> newDirectDeps = env.newlyRequestedDeps;
 
       if (value != null) {
-        Preconditions.checkState(!env.valuesMissing,
+        Preconditions.checkState(!env.valuesMissing(),
             "%s -> %s, ValueEntry: %s", skyKey, newDirectDeps, state);
         env.setValue(value);
         registerNewlyDiscoveredDepsForDoneEntry(skyKey, state, env);