Split FileBuilder into LibraryBuilder and PartBuilder (#3)

* Remove unused dependency.

* Split FileBuilder into Library/PartBuilder.

* Move FileBuilder#addDirectove to LibraryBuilder.

lib/code_builder.dart

@@ -31,7 +31,6 @@ library code_builder;
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/src/dart/ast/token.dart';
-import 'package:analyzer/src/generated/java_core.dart';
 import 'package:dart_style/dart_style.dart';
 import 'package:meta/meta.dart';
 

lib/src/file_builder.dart

@@ -4,73 +4,74 @@
 
 part of code_builder;
 
+CompilationUnit _emptyCompilationUnit() => new CompilationUnit(
+  null,
+  null,
+  null,
+  null,
+  null,
+  );
+
 /// Builds files of Dart source code.
 ///
-/// Files may either be a standalone library or `part of` another library.
-class FileBuilder extends _AbstractCodeBuilder<CompilationUnit> {
-  static Token _library = new KeywordToken(Keyword.LIBRARY, 0);
-  static Token _part = new KeywordToken(Keyword.PART, 0);
-  static Token _of = new StringToken(TokenType.KEYWORD, 'of', 0);
+/// See [LibraryBuilder] and [PartBuilder] for concrete implementations.
+abstract class FileBuilder extends _AbstractCodeBuilder<CompilationUnit> {
+  FileBuilder._(CompilationUnit astNode) : super._(astNode);
+
+  /// Adds [declaration]'s resulting AST to the source.
+  void addDeclaration(CodeBuilder<Declaration> declaration) {
+    _astNode.declarations.add(declaration.toAst());
+  }
+}
+
+/// Builds a standalone Dart library [CompilationUnit] AST.
+class LibraryBuilder extends FileBuilder {
+  static final Token _library = new KeywordToken(Keyword.LIBRARY, 0);
 
   /// Create a new standalone Dart library, optionally with a [name].
-  factory FileBuilder([String name]) {
+  factory LibraryBuilder([String name]) {
     var astNode = _emptyCompilationUnit();
     if (name != null) {
       astNode.directives.add(new LibraryDirective(
-        null,
-        null,
-        _library,
-        new LibraryIdentifier([_stringId(name)]),
-        null,
-      ));
+          null,
+          null,
+          _library,
+          new LibraryIdentifier([_stringId(name)]),
+          null,));
     }
-    return new FileBuilder._(astNode);
+    return new LibraryBuilder._(astNode);
   }
 
-  /// Create a new `part of` the dart library with [name].
-  factory FileBuilder.partOf(String name) {
-    var astNode = _emptyCompilationUnit();
-    astNode.directives.add(new PartOfDirective(
-      null,
-      null,
-      _part,
-      _of,
-      new LibraryIdentifier([_stringId(name)]),
-      null,
-    ));
-    return new FileBuilder._(astNode);
-  }
-
-  FileBuilder._(CompilationUnit astNode) : super._(astNode);
+  LibraryBuilder._(CompilationUnit astNode) : super._(astNode);
 
-  /// Add a copy of [clazz] as a declaration in this file.
-  void addClass(ClassBuilder clazz) {
-    _astNode.declarations.add(clazz.toAst());
-  }
-
-  /// Adds an `import` or `export` [directive].
+  /// Adds [directive]'s resulting AST to the source.
   void addDirective(CodeBuilder<Directive> directive) {
-    if (isPartOf) {
-      throw const DartPartFileException._();
-    }
     _astNode.directives.add(directive.toAst());
   }
+}
 
-  static CompilationUnit _emptyCompilationUnit() => new CompilationUnit(
-        null,
-        null,
+/// Builds a `part of` [CompilationUnit] AST for an existing Dart library.
+class PartBuilder extends FileBuilder {
+  static final Token _part = new KeywordToken(Keyword.PART, 0);
+  static final Token _of = new StringToken(TokenType.KEYWORD, 'of', 0);
+
+  /// Create a new `part of` source file.
+  factory PartBuilder(String name) {
+    var astNode = _emptyCompilationUnit();
+    astNode.directives.add(new PartOfDirective(
         null,
         null,
+        _part,
+        _of,
+        new LibraryIdentifier([_stringId(name)]),
         null,
-      );
-
-  static bool _isPartOf(Directive d) => d is PartOfDirective;
+        ));
+    return new PartBuilder._(astNode);
+  }
 
-  /// Whether the file is `part of` another.
-  bool get isPartOf => _astNode.directives.contains(_isPartOf);
+  PartBuilder._(CompilationUnit astNode) : super._(astNode);
 }
-
-/// An `export` directive in a [FileBuilder].
+/// An `export` directive in a [LibraryBuilder].
 class ExportBuilder extends _AbstractCodeBuilder<ExportDirective> {
   /// Create a new `export` directive exporting [uri].
   factory ExportBuilder(String uri) {
@@ -81,13 +82,13 @@ class ExportBuilder extends _AbstractCodeBuilder<ExportDirective> {
   ExportBuilder._(ExportDirective astNode) : super._(astNode);
 
   static ExportDirective _createExportDirective() => new ExportDirective(
-        null,
-        null,
-        null,
-        null,
-        null,
-        null,
-        null,
+      null,
+      null,
+      null,
+      null,
+      null,
+      null,
+      null,
       );
 }
 
@@ -111,23 +112,15 @@ class ImportBuilder extends _AbstractCodeBuilder<ImportDirective> {
   ImportBuilder._(ImportDirective astNode) : super._(astNode);
 
   static ImportDirective _createImportDirective() => new ImportDirective(
-        null,
-        null,
-        null,
-        null,
-        null,
-        null,
-        null,
-        null,
-        null,
-        null,
+      null,
+      null,
+      null,
+      null,
+      null,
+      null,
+      null,
+      null,
+      null,
+      null,
       );
 }
-
-/// Thrown when an invalid operation is attempted on a [FileBuilder] instance.
-class DartPartFileException implements Exception {
-  const DartPartFileException._();
-
-  @override
-  String toString() => 'Not a valid operation for a `part of` file.';
-}

pubspec.yaml

@@ -1,5 +1,5 @@
 name: code_builder
-version: 0.1.0-dev
+version: 0.1.0-dev+1
 description: A fluent API for generating Dart code
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/code_builder

test/builders/file_builder_test.dart

@@ -8,17 +8,17 @@ import 'package:test/test.dart';
 
 void main() {
   test('should emit a blank file', () {
-    expect(new FileBuilder(), equalsSource(''));
+    expect(new LibraryBuilder(), equalsSource(''));
   });
 
   test('should emit a file with a library directive', () {
     expect(
-        new FileBuilder('code_builder'), equalsSource('library code_builder;'));
+        new LibraryBuilder('code_builder'), equalsSource('library code_builder;'));
   });
 
   test('should emit a file with a part of directive', () {
     expect(
-      new FileBuilder.partOf('code_builder'),
+      new PartBuilder('code_builder'),
       equalsSource('part of code_builder;'),
     );
   });

test/integration_test.dart

@@ -32,11 +32,11 @@ void main() {
             ],
           )),
       );
-    var lib = new FileBuilder()
+    var lib = new LibraryBuilder()
       ..addDirective(
         new ImportBuilder('app.dart'),
       )
-      ..addClass(clazz);
+      ..addDeclaration(clazz);
     expect(
       lib,
       equalsSource(