Issue 26044. Cache and use LibraryElementImpl.exportNamespace.

pkg/analyzer/lib/src/context/cache.dart

Index: pkg/analyzer/lib/src/context/cache.dart
diff --git a/pkg/analyzer/lib/src/context/cache.dart b/pkg/analyzer/lib/src/context/cache.dart
index eb65a4e4091183d17e64bebb3e347860e2e51a06..3db74f9dc1ba47693c08aa01f6bf4fbaa02d885e 100644
--- a/pkg/analyzer/lib/src/context/cache.dart
+++ b/pkg/analyzer/lib/src/context/cache.dart
@@ -565,7 +565,8 @@ class CacheEntry {
     // Ask the delta to validate.
     DeltaResult deltaResult = null;
     if (delta != null) {
-      deltaResult = delta.validate(_partition.context, target, descriptor);
+      deltaResult = delta.validate(_partition.context, target, descriptor,
+          thisData.state, thisData.value);
       if (deltaResult == DeltaResult.STOP) {
         return;
       }
@@ -1056,10 +1057,11 @@ class Delta {
 
   /**
    * Check whether this delta affects the result described by the given
-   * [descriptor] and [target].
+   * [descriptor] and [target]. The current [state] and [value] of the result
+   * are provided.
    */
   DeltaResult validate(InternalAnalysisContext context, AnalysisTarget target,
-      ResultDescriptor descriptor) {
+      ResultDescriptor descriptor, CacheState state, Object value) {

[Brian Wilkerson, 2016/03/20 21:26:29]

I'm not seeing where the state is used, but maybe I'm just missing something.

[scheglov, 2016/03/20 22:16:46]

No, you're not missing.
I thought that maybe it would be useful to provide it when we provide value, but
given that this is not API we can add it later if we would need it.

     return DeltaResult.INVALIDATE;
   }
 }