First round of changes to the file interface.

runtime/bin/file_impl.dart

Index: runtime/bin/file_impl.dart
diff --git a/runtime/bin/file_impl.dart b/runtime/bin/file_impl.dart
index 00f801d7d9585db6bb4f933fe94497dd1ea97265..5efce7e440d6463b710cc4db14a102311126276d 100644
--- a/runtime/bin/file_impl.dart
+++ b/runtime/bin/file_impl.dart
@@ -2,9 +2,10 @@
 // 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.
 
-class _FileInputStream implements InputStream {
+class _FileInputStream implements FileInputStream {
   _FileInputStream(File file) {
-    _file = file;
+    _file = new File(file.name);
+    _file.openSync();
   }
 
   List<int> read([int len]) {
@@ -20,7 +21,7 @@ class _FileInputStream implements InputStream {
       }
     }
     List<int> buffer = new List<int>(bytesToRead);
-    int bytesRead = _file.readList(buffer, 0, bytesToRead);
+    int bytesRead = _file.readListSync(buffer, 0, bytesToRead);
     if (bytesRead < bytesToRead) {
       List<int> newBuffer = new List<int>(bytesRead);
       newBuffer.copyFrom(buffer, 0, 0, bytesRead);
@@ -35,15 +36,19 @@ class _FileInputStream implements InputStream {
     if (len == null) len = buffer.length;
     if (offset < 0) throw new StreamException("Illegal offset $offset");
     if (len < 0) throw new StreamException("Illegal length $len");
-    return _file.readList(buffer, offset, len);
+    return _file.readListSync(buffer, offset, len);
   }
 
   int available() {
-    return _file.length - _file.position;
+    return _file.lengthSync() - _file.positionSync();
   }
 
   bool closed() {
-    _file.position == _file.length;
+    _file.positionSync() == _file.lengthSync();
+  }
+
+  void close() {
+    _file.closeSync();
   }
 
   void set dataHandler(void callback()) {
@@ -62,13 +67,14 @@ class _FileInputStream implements InputStream {
 }
 
 
-class _FileOutputStream implements OutputStream {
+class _FileOutputStream implements FileOutputStream {
   _FileOutputStream(File file) {
-    _file = file;
+    _file = new File(file.name);
+    _file.openSync(true);
   }
 
   bool write(List<int> buffer, int offset, int len, void callback()) {
-    int bytesWritten = _file.writeList(buffer, offset, len);
+    int bytesWritten = _file.writeListSync(buffer, offset, len);
 
     if (bytesWritten == len) {
       return true;
@@ -77,58 +83,78 @@ class _FileOutputStream implements OutputStream {
     }
   }
 
+  void close() {
+    _file.closeSync();
+  }
+
   File _file;
 }
 
 
 // Class for encapsulating the native implementation of files.
-class _File extends FileNativeWrapper implements File {
+class _File implements File {
   // Constructor for file.
-  factory _File(String name, bool writable) {
-    _File file = new _File._internal();
-    if (!file._openFile(name, writable)) {
-      return null;
+  _File(String this._name);
+
+  void exists() {
+    throw "Unimplemented";
+  }
+
+  bool existsSync() {
+    return _fileExists(_name);
+  }
+
+  bool _fileExists(String name) native "File_Exists";
+
+  void create() {
+    throw "Unimplemented";
+  }
+
+  void createSync() {
+    throw "Unimplemented";
+  }
+
+  void open([bool writable = false]) {
+    throw "Unimplemented";
+  }
+
+  void openSync([bool writable = false]) {
+    if (!_openFile(_name, writable)) {
+      throw new FileIOException("Cannot open file: $_name");
     }
-    file._writeable = writable;
-    return file;
   }
-  _File._internal();
 
   bool _openFile(String name, bool writable) native "File_OpenFile";
 
   void close() {
-     _close();
+    throw "Unimplemented";
   }
+
+  void closeSync() {
+    _close();
+  }
+
   int _close() native "File_Close";
 
-  int readByte() {
+  void readByte() {
+    throw "Unimplemented";
+  }
+
+  int readByteSync() {
     int result = _readByte();
     if (result == -1) {
       throw new FileIOException("Error: readByte failed");
     }
     return result;
   }
-  int _readByte() native "File_ReadByte";
 
-  int writeByte(int value) {
-    int result = _writeByte(value);
-    if (result == -1) {
-      throw new FileIOException("Error: writeByte failed");
-    }
-    return result;
-  }
-  int _writeByte(int value) native "File_WriteByte";
+  int _readByte() native "File_ReadByte";
 
-  int writeString(String string) {
-    int result = _writeString(string);
-    if (result == -1) {
-      throw new FileIOException("Error: writeString failed");
-    }
-    return result;
+  void readList(List<int> buffer, int offset, int bytes) {
+    throw "Unimplemented";
   }
-  int _writeString(String string) native "File_WriteString";
 
-  int readList(List<int> buffer, int offset, int bytes) {
+  int readListSync(List<int> buffer, int offset, int bytes) {
     if (bytes == 0) {
       return 0;
     }
@@ -147,10 +173,28 @@ class _File extends FileNativeWrapper implements File {
     }
     return result;
   }
-  int _readList(List<int> buffer, int offset, int bytes)
-      native "File_ReadList";
+
+  int _readList(List<int> buffer, int offset, int bytes) native "File_ReadList";
+
+  void writeByte(int value) {
+    throw "Unimplemented";
+  }
+
+  int writeByteSync(int value) {
+    int result = _writeByte(value);
+    if (result == -1) {
+      throw new FileIOException("Error: writeByte failed");
+    }
+    return result;
+  }
+
+  int _writeByte(int value) native "File_WriteByte";
 
   int writeList(List<int> buffer, int offset, int bytes) {
+    throw "Unimplemented";
+  }
+
+  int writeListSync(List<int> buffer, int offset, int bytes) {
     if (bytes == 0) {
       return 0;
     }
@@ -169,58 +213,118 @@ class _File extends FileNativeWrapper implements File {
     }
     return result;
   }
+
   int _writeList(List<int> buffer, int offset, int bytes)
       native "File_WriteList";
 
-  int get position() {
+  int writeString(String string) {
+    throw "Unimplemented";
+  }
+
+  int writeStringSync(String string) {
+    int result = _writeString(string);
+    if (result == -1) {
+      throw new FileIOException("Error: writeString failed");
+    }
+    return result;
+  }
+
+  int _writeString(String string) native "File_WriteString";
+
+  int position() {
+    throw "Unimplemented";
+  }
+
+  int positionSync() {
     int result = _position;
     if (result == -1) {
       throw new FileIOException("Error: get position failed");
     }
     return result;
   }
+
   int get _position() native "File_Position";
 
-  int get length() {
+  int length() {
+    throw "Unimplemented";
+  }
+
+  int lengthSync() {
     int result = _length;
     if (result == -1) {
       throw new FileIOException("Error: get length failed");
     }
     return result;
   }
+
   int get _length() native "File_Length";
 
   void flush() {
+    throw "Unimplemented";
+  }
+
+  void flushSync() {
     int result = _flush();
     if (result == -1) {
       throw new FileIOException("Error: flush failed");
     }
   }
+
   int _flush() native "File_Flush";
 
-  // Each file has an unique InputStream.
-  InputStream get inputStream() {
-    if (_inputStream == null) {
-      _inputStream = new _FileInputStream(this);
-    }
-    return _inputStream;
+  InputStream openInputStream() {
+    return new _FileInputStream(this);
   }
 
-  // Each file has an unique OutputStream.
-  OutputStream get outputStream() {
-    if (!_writeable) {
-      throw "File is not writable";
-    }
-    if (_outputStream == null) {
-      _outputStream = new _FileOutputStream(this);
-    }
-    return _outputStream;
+  OutputStream openOutputStream() {
+    return new _FileOutputStream(this);
+  }
+
+  String get name() {
+    return _name;
+  }
+
+  void set existsHandler(void handler(bool exists)) {
+    _existsHandler = handler;
+  }
+
+  void set createHandler(void handler()) {
+    _createHandler = handler;
+  }
+
+  void set openHandler(void handler()) {
+    _openHandler = handler;
+  }
+
+  void set closeHandler(void handler()) {
+    _closeHandler = handler;
+  }
+
+  void set readByteHandler(void handler(int byte)) {
+    _readByteHandler = handler;
+  }
+
+  void set readListHandler(void handler(int read)) {
+    _readListHandler = handler;
+  }
+
+  void set noPendingWriteHandler(void handler()) {
+    _noPendingWriteHandler = handler;
+  }
+
+  void set errorHandler(void handler(String error)) {
+    _errorHandler = handler;
   }
 
-  // Set of native methods used to provide file functionality.
-  static bool fileExists(String name) native "File_Exists";
+  String _name;
+  int _id;
 
-  bool _writeable;
-  InputStream _inputStream;
-  OutputStream _outputStream;
+  var _existsHandler;
+  var _createHandler;
+  var _openHandler;
+  var _closeHandler;
+  var _readByteHandler;
+  var _readListHandler;
+  var _noPendingWriteHandler;
+  var _errorHandler;
 }