Added JsonFactory._streamFromFile(...) to help testing #3455

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/core/JsonFactory.java

@@ -1026,7 +1026,7 @@ public JsonFactory setCodec(ObjectCodec oc) {
     public JsonParser createParser(File f) throws IOException, JsonParseException {
         // true, since we create InputStream from File
         IOContext ctxt = _createContext(_createContentReference(f), true);
-        InputStream in = new FileInputStream(f);
+        InputStream in = _streamFromFile(f);
         return _createParser(_decorate(in, ctxt), ctxt);
     }
 

src/main/java/com/fasterxml/jackson/core/TokenStreamFactory.java

@@ -178,8 +178,9 @@ public abstract class TokenStreamFactory
     protected OutputStream _createDataOutputWrapper(DataOutput out) {
         return new DataOutputAsStream(out);
     }
+
     /**
-     * Helper methods used for constructing an optimal stream for
+     * Helper method used for constructing an optimal stream for
      * parsers to use, when input is to be read from an URL.
      * This helps when reading file content via URL.
      *
@@ -210,4 +211,14 @@ protected InputStream _optimizedStreamFromURL(URL url) throws IOException {
         }
         return url.openStream();
     }
+
+    /**
+     * Helper methods used for constructing an {@link InputStream} for
+     * parsers to use, when input is to be read from given {@link File}.
+     *
+     * @since 2.14
+     */
+    protected InputStream _streamFromFile(File f) throws IOException {
+        return new FileInputStream(f);
+    }
 }