Remove more references to AnalysisContext

pkg/analysis_server/lib/src/services/dependencies/library_dependencies.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.
-
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
-
-class LibraryDependencyCollector {
-  final Set<LibraryElement> _visitedLibraries = new Set<LibraryElement>();
-  final Set<String> _dependencies = new Set<String>();
-
-  final Iterable<AnalysisContext> _contexts;
-
-  LibraryDependencyCollector(this._contexts);
-
-  Map<String, Map<String, List<String>>> calculatePackageMap(
-      Map<Folder, AnalysisContext> folderMap) {
-    Map<AnalysisContext, Folder> contextMap = _reverse(folderMap);
-    Map<String, Map<String, List<String>>> result =
-        new Map<String, Map<String, List<String>>>();
-    for (AnalysisContext context in _contexts) {
-      Map<String, List<Folder>> packageMap = context.sourceFactory.packageMap;
-      if (packageMap != null) {
-        Map<String, List<String>> map = new Map<String, List<String>>();
-        packageMap.forEach((String name, List<Folder> folders) =>
-            map[name] = new List.from(folders.map((Folder f) => f.path)));
-        result[contextMap[context].path] = map;
-      }
-    }
-    return result;
-  }
-
-  Set<String> collectLibraryDependencies() {
-    _contexts.forEach((AnalysisContext context) => context.librarySources
-        .forEach((Source source) =>
-            _addDependencies(context.getLibraryElement(source))));
-    return _dependencies;
-  }
-
-  void _addDependencies(LibraryElement libraryElement) {
-    if (libraryElement == null) {
-      return;
-    }
-    if (_visitedLibraries.add(libraryElement)) {
-      for (CompilationUnitElement cu in libraryElement.units) {
-        String path = cu.source.fullName;
-        if (path != null) {
-          _dependencies.add(path);
-        }
-      }
-      libraryElement.imports.forEach(
-          (ImportElement import) => _addDependencies(import.importedLibrary));
-      libraryElement.exports.forEach(
-          (ExportElement export) => _addDependencies(export.exportedLibrary));
-    }
-  }
-
-  Map<AnalysisContext, Folder> _reverse(Map<Folder, AnalysisContext> map) {
-    Map<AnalysisContext, Folder> reverseMap =
-        new Map<AnalysisContext, Folder>();
-    map.forEach((Folder f, AnalysisContext c) => reverseMap[c] = f);
-    return reverseMap;
-  }
-}