Added an exception class to indicate IO Errors.

gson/src/main/java/com/google/gson/JsonIOException.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2008 Google Inc.
+ *
+ * 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.gson;
+
+/**
+ * This exception is raised when Gson was unable to read an input stream
+ * or write to one.
+ * 
+ * @author Inderjeet Singh
+ * @author Joel Leitch
+ */
+public final class JsonIOException extends JsonParseException {
+
+  public JsonIOException(String msg) {
+    super(msg);
+  }
+
+  public JsonIOException(String msg, Throwable cause) {
+    super(msg, cause);
+  }
+
+  /**
+   * Creates exception with the specified cause. Consider using
+   * {@link #JsonIOException(String, Throwable)} instead if you can describe what happened.
+   *
+   * @param cause root exception that caused this exception to be thrown.
+   */
+  public JsonIOException(Throwable cause) {
+    super(cause);
+  }
+}

gson/src/main/java/com/google/gson/JsonParseException.java

@@ -29,7 +29,7 @@ package com.google.gson;
  * @author Inderjeet Singh
  * @author Joel Leitch
  */
-public final class JsonParseException extends RuntimeException {
+public class JsonParseException extends RuntimeException {
   static final long serialVersionUID = -4086729973971783390L;
 
   /**

gson/src/main/java/com/google/gson/Streams.java

@@ -18,6 +18,7 @@ package com.google.gson;
 
 import com.google.gson.stream.JsonReader;
 import com.google.gson.stream.JsonWriter;
+
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.Writer;
@@ -71,7 +72,7 @@ final class Streams {
       if (e instanceof EOFException) {
         return JsonNull.createJsonNull();
       }
-      throw new JsonParseException(e);
+      throw new JsonIOException(e);
     } catch (NumberFormatException e) {
       throw new JsonParseException(e);
     }