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diff --git a/tools/closure_linter-2.3.4/closure_linter/common/errorhandler.py b/tools/closure_linter-2.3.4/closure_linter/common/errorhandler.py
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+++ b/tools/closure_linter-2.3.4/closure_linter/common/errorhandler.py
@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+#
+# Copyright 2008 The Closure Linter Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS-IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Interface for a linter error handler.
+
+Error handlers aggregate a set of errors from multiple files and can optionally
+perform some action based on the reported errors, for example, logging the error
+or automatically fixing it.
+"""
+
+__author__ = ('robbyw@google.com (Robert Walker)',
+              'ajp@google.com (Andy Perelson)')
+
+
+class ErrorHandler(object):
+  """Error handler interface."""
+
+  def __init__(self):
+    if self.__class__ == ErrorHandler:
+      raise NotImplementedError('class ErrorHandler is abstract')
+
+  def HandleFile(self, filename, first_token):
+    """Notifies this ErrorHandler that subsequent errors are in filename.
+
+    Args:
+      filename: The file being linted.
+      first_token: The first token of the file.
+    """
+
+  def HandleError(self, error):
+    """Append the error to the list.
+
+    Args:
+      error: The error object
+    """
+
+  def FinishFile(self):
+    """Finishes handling the current file.
+
+    Should be called after all errors in a file have been handled.
+    """
+
+  def GetErrors(self):
+    """Returns the accumulated errors.
+
+    Returns:
+      A sequence of errors.
+    """