1 files changed, 13 insertions, 3 deletions

diff --git a/src/main/TweetShell.java b/src/main/TweetShell.java
index fae4125..cb31511 100644
--- a/src/main/TweetShell.java
+++ b/src/main/TweetShell.java
@@ -37,6 +37,12 @@ public class TweetShell implements TwitterApi.PinSupplier {
     private Stream stream_cached;
     private final CompositeResultListener resultListeners;
 
+    /**
+     * Whether to convert uncompressed tweet files (e.g. "tweets.txt") to the
+     * compressed files ("tweets.txt.gz").
+     */
+    public final static String CFG_CONVERT_UNCOMPRESSED = "convert-uncompressed";
+
     public TweetShell() {
         resultListeners = new CompositeResultListener();
         // by default, store something that counts responses
@@ -420,13 +426,19 @@ public class TweetShell implements TwitterApi.PinSupplier {
         if (DataWriter.class.isAssignableFrom(rlCls)) {
             Configuration config = Configuration.getConfig();
 
+            if (resultListeners.findListener(CompressableDataWriter.class) != null
+                    || resultListeners.findListener(DataWriter.class) != null) {
+                System.err.println("Cannot enable both file and cfile.");
+                return false;
+            }
+
             String tweetsFilename = config.getProperty(DataWriter.CFG_TWEETS_FILENAME);
             try {
                 DataWriter dw;
                 if (CompressableDataWriter.class.isAssignableFrom(rlCls)) {
                     // compressed stream, convert by default (removing orig)
                     boolean convertUncompressed = Boolean.parseBoolean(
-                            config.getProperty("convert-uncompressed", "true"));
+                            config.getProperty(CFG_CONVERT_UNCOMPRESSED, "true"));
                     dw = new CompressableDataWriter(
                             tweetsFilename, convertUncompressed);
                 } else {
@@ -434,8 +446,6 @@ public class TweetShell implements TwitterApi.PinSupplier {
                 }
                 dw.open();
                 resultListeners.register(dw);
-                // save the changes to the config.
-                config.save();
             } catch (IOException ex) {
                 System.err.println("Could not open file for storing tweets:");
                 System.err.println(ex.getMessage());