1 files changed, 78 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/vfs/IORuntimeException.java b/src/main/java/com/google/devtools/build/lib/vfs/IORuntimeException.java
new file mode 100644
index 0000000000..2769fe93f4
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/vfs/IORuntimeException.java
@@ -0,0 +1,78 @@
+// 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.
+// All Rights Reserved.
+
+package com.google.devtools.build.lib.vfs;
+
+import java.io.IOException;
+
+/**
+ * Signals that an I/O exception of some sort has occurred. Contrary to
+ * <code>java.io.IOException</code>, this class is a subclass of
+ * <code>RuntimeException</code>, which allows you to signal an I/O problem
+ * without polluting the callers. For details on why checked exceptions is bad,
+ * try searching for "java checked exception mistake" on Google.
+ */
+public class IORuntimeException extends RuntimeException {
+  /**
+   * Constructs a new IORuntimeException with null as its detail message.
+   */
+  public IORuntimeException() {
+    super();
+  }
+
+  /**
+   * Constructs a new IORuntimeException with the specified detail message.
+   */
+  public IORuntimeException(String message) {
+    super(message);
+  }
+
+  /**
+   * Constructs a new IORuntimeException with the specified detail message and
+   * cause.
+   *
+   * @param message the detail message, which is saved for later retrieval by
+   *        the <code>Throwable.getMessage()</code> method.
+   * @param cause the cause (which is saved for later retrieval by the
+   *        <code>Throwable.getCause()</code> method). (A null value is
+   *        permitted, and indicates that the cause is nonexistent or unknown.)
+   */
+  public IORuntimeException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
+  /**
+   * Constructs a new IORuntimeException as a wrapper on a root cause
+   */
+  public IORuntimeException(Throwable cause) {
+    super(cause);
+  }
+
+  /**
+   * @return the actual IOException that caused this exception, or null if it
+   *         was not caused by an IOException. Call <code>getCause()</code>
+   *         instead if it was caused by other types of exceptions.
+   */
+  public IOException getCauseIOException() {
+    Throwable cause = getCause();
+    if (cause instanceof IOException) {
+      return (IOException) cause;
+    } else {
+      return null;
+    }
+  }
+
+  private static final long serialVersionUID = 1L;
+}