Remove memento.

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

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.context.cache;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisEngine, CacheState, InternalAnalysisContext, RetentionPriority;
@@ skipping 241 matching lines @@
   /**
    * Fix the state of the [exception] to match the current state of the entry.
    */
   void fixExceptionState() {
     if (!hasErrorState()) {
       _exception = null;
     }
   }
 
   /**
-   * Return the memento of the result represented by the given [descriptor].
-   */
-  Object getMemento(ResultDescriptor descriptor) {
-    ResultData data = _resultMap[descriptor];
-    if (data == null) {
-      return null;
-    }
-    return data.memento;
-  }
-
-  /**
    * Return the state of the result represented by the given [descriptor].
    */
   CacheState getState(ResultDescriptor descriptor) {
     ResultData data = _resultMap[descriptor];
     if (data == null) {
       return CacheState.INVALID;
     }
     return data.state;
   }
 
@@ skipping 90 matching lines @@
         // If the state is in-process, we can leave the current value in the
         // cache for any 'get' methods to access.
         //
         data.value = descriptor.defaultValue;
       }
     }
   }
 
   /**
    * Set the value of the result represented by the given [descriptor] to the
-   * given [value]. The optional [memento] may help to recompute [value] more
-   * efficiently after invalidation.
+   * given [value].
    */
   /*<V>*/ void setValue(ResultDescriptor /*<V>*/ descriptor, dynamic /*V*/
-      value, List<TargetedResult> dependedOn, Object memento) {
+      value, List<TargetedResult> dependedOn) {
     _validateStateChange(descriptor, CacheState.VALID);
     TargetedResult thisResult = new TargetedResult(target, descriptor);
     if (_partition != null) {
       _partition.resultStored(thisResult, value);
     }
     _invalidate(descriptor, null);
     ResultData data = _getResultData(descriptor);
     _setDependedOnResults(data, thisResult, dependedOn);
     data.state = CacheState.VALID;
     data.value = value == null ? descriptor.defaultValue : value;
-    data.memento = memento;
   }
 
   @override
   String toString() {
     StringBuffer buffer = new StringBuffer();
     _writeOn(buffer);
     return buffer.toString();
   }
 
   /**
@@ skipping 372 matching lines @@
    */
   CacheState state;
 
   /**
    * The value being cached, or the default value for the result if there is no
    * value (for example, when the [state] is [CacheState.INVALID]).
    */
   Object value;
 
   /**
-   * The optional data that is remembered with [value] and, when [value] is
-   * invalidated, may help to recompute it more efficiently.
-   */
-  Object memento;
-
-  /**
    * A list of the results on which this result depends.
    */
   List<TargetedResult> dependedOnResults = <TargetedResult>[];
 
   /**
    * A list of the results that depend on this result.
    */
   List<TargetedResult> dependentResults = <TargetedResult>[];
 
   /**
    * Initialize a newly created result holder to represent the value of data
    * described by the given [descriptor].
    */
   ResultData(this.descriptor) {
     state = CacheState.INVALID;
     value = descriptor.defaultValue;
   }
 
   /**
    * Flush this value.
    */
   void flush() {
     state = CacheState.FLUSHED;
     value = descriptor.defaultValue;
-    memento = null;
   }
 }
 
 /**
  * A cache partition that contains all of the targets in the SDK.
  */
 class SdkCachePartition extends CachePartition {
   /**
    * Initialize a newly created cache partition, belonging to the given
    * [context].
@@ skipping 56 matching lines @@
 class UniversalCachePartition extends CachePartition {
   /**
    * Initialize a newly created cache partition, belonging to the given
    * [context].
    */
   UniversalCachePartition(InternalAnalysisContext context) : super(context);
 
   @override
   bool isResponsibleFor(AnalysisTarget target) => true;
 }