Update from Google.

--
MOE_MIGRATED_REVID=85702957
diff --git a/src/main/java/com/google/devtools/build/docgen/BuildEncyclopediaDocException.java b/src/main/java/com/google/devtools/build/docgen/BuildEncyclopediaDocException.java
new file mode 100644
index 0000000..d3b12c4
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/docgen/BuildEncyclopediaDocException.java
@@ -0,0 +1,48 @@
+// Copyright 2014 Google Inc. 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.
+package com.google.devtools.build.docgen;
+
+/**
+ * An exception for Build Encyclopedia generation implementing the common BLAZE
+ * error formatting, i.e. displaying file name and line number.
+ */
+public class BuildEncyclopediaDocException extends Exception {
+
+  private String fileName;
+  private int lineNumber;
+  private String errorMsg;
+
+  public BuildEncyclopediaDocException(String fileName, int lineNumber, String errorMsg) {
+    this.fileName = fileName;
+    this.lineNumber = lineNumber;
+    this.errorMsg = errorMsg;
+  }
+
+  public String getFileName() {
+    return fileName;
+  }
+
+  public int getLineNumber() {
+    return lineNumber;
+  }
+
+  public String getErrorMsg() {
+    return errorMsg;
+  }
+
+  @Override
+  public String getMessage() {
+    return "Error in " + fileName + ":" + lineNumber + ": " + errorMsg;
+  }
+}