Make new ObjectFileWriter method available on ObjectWriter as well. (#475)

Author: blackwinter

metafacture-io/src/main/java/org/metafacture/io/ObjectFileWriter.java

@@ -139,7 +139,7 @@ public void closeStream() {
      * effective the next time a new output file is opened.
      *
      * @param appendIfFileExists true if new data should be appended,
-     *                           false to overwrite the existing file.
+     *                           false to overwrite the existing file
      */
     public void setAppendIfFileExists(final boolean appendIfFileExists) {
         this.appendIfFileExists = appendIfFileExists;

metafacture-io/src/main/java/org/metafacture/io/ObjectWriter.java

@@ -128,6 +128,20 @@ public void setSeparator(final String separator) {
         objectWriter.setSeparator(separator);
     }
 
+    /**
+     * Controls whether to open files in append mode if they exist.
+     *
+     * @see ObjectFileWriter#setAppendIfFileExists
+     *
+     * @param appendIfFileExists true if new data should be appended,
+     *                           false to overwrite the existing file
+     */
+    public void setAppendIfFileExists(final boolean appendIfFileExists) {
+        if (objectWriter instanceof ObjectFileWriter) {
+            ((ObjectFileWriter) objectWriter).setAppendIfFileExists(appendIfFileExists);
+        }
+    }
+
     @Override
     public void process(final T obj) {
         objectWriter.process(obj);