Consolidate duplicate code for resloving URIs.

pkg/analyzer/lib/src/generated/source_io.dart

 // Copyright (c) 2014, 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.generated.source_io;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/generated/utilities_dart.dart';
 
 export 'package:analyzer/src/generated/source.dart';
 
 /**
  * Instances of the class [DirectoryBasedSourceContainer] represent a source container that
  * contains all sources within a given directory.
  */
 class DirectoryBasedSourceContainer implements SourceContainer {
   /**
    * The container's path (not `null`).
@@ skipping 216 matching lines @@
   }
 
   @override
   bool operator ==(Object object) =>
       object is FileBasedSource && id == object.id;
 
   @override
   bool exists() => file.isFile();
 
   @override
-  Uri resolveRelativeUri(Uri containedUri) {
-    try {
-      Uri baseUri = uri;
-      bool isOpaque = uri.isAbsolute && !uri.path.startsWith('/');
-      if (isOpaque) {
-        String scheme = uri.scheme;
-        String part = uri.path;
-        if (scheme == DartUriResolver.DART_SCHEME && part.indexOf('/') < 0) {
-          part = "$part/$part.dart";
-        }
-        baseUri = parseUriWithException("$scheme:/$part");
-      }
-      Uri result = baseUri.resolveUri(containedUri);
-      if (isOpaque) {
-        result = parseUriWithException(
-            "${result.scheme}:${result.path.substring(1)}");
-      }
-      return result;
-    } catch (exception, stackTrace) {
-      throw new AnalysisException(
-          "Could not resolve URI ($containedUri) relative to source ($uri)",
-          new CaughtException(exception, stackTrace));
-    }
-  }
-
-  @override
   String toString() {
     if (file == null) {
       return "<unknown source>";
     }
     return file.getAbsolutePath();
   }
 }
 
 /**
  * Instances of the class `FileUriResolver` resolve `file` URI's.
@@ skipping 293 matching lines @@
   }
 
   /**
    * Return `true` if the given URI is a `file` URI.
    *
    * @param uri the URI being tested
    * @return `true` if the given URI is a `file` URI
    */
   static bool isFileUri(Uri uri) => uri.scheme == FILE_SCHEME;
 }