Refactor Sets.saveDeck into a deck exporter series of classes.

Mage/src/main/java/mage/cards/decks/DeckFormats.java

@@ -0,0 +1,90 @@
+package mage.cards.decks;
+
+import mage.cards.decks.exporter.DckExporter;
+import mage.cards.decks.exporter.DeckExporter;
+import mage.cards.decks.exporter.MtgoExporter;
+
+import java.io.*;
+import java.util.Optional;
+
+public enum DeckFormats {
+
+    DCK(new DckExporter()),
+    MTGO(new MtgoExporter());
+
+    private final DeckExporter exporter;
+
+    DeckFormats(DeckExporter exporter) {
+        this.exporter = exporter;
+    }
+
+    public DeckExporter getExporter() {
+        return exporter;
+    }
+
+    public static Optional<DeckFormats> getFormatForExtension(String filename) {
+        return getExtension(filename).map(c -> {
+            try {
+                return DeckFormats.valueOf(c);
+            } catch (IllegalArgumentException e) {
+                return null;
+            }
+        });
+    }
+
+    public static Optional<String> getExtension(String filename) {
+        int i = filename.lastIndexOf('.');
+        if (i > 0) {
+            return Optional.of(filename.substring(i+1).toUpperCase());
+        } else {
+            return Optional.empty();
+        }
+    }
+
+    public static void writeDeck(String file, DeckCardLists deck) throws IOException {
+        writeDeck(new File(file), deck);
+    }
+
+    public static void writeDeck(String file, DeckCardLists deck, DeckFormats format) throws IOException {
+        writeDeck(new File(file), deck, format);
+    }
+
+    public static void writeDeck(String file, DeckCardLists deck, DeckExporter exporter) throws IOException {
+        writeDeck(new File(file), deck, exporter);
+    }
+
+    public static void writeDeck(File file, DeckCardLists deck) throws IOException {
+        DeckFormats format = DeckFormats.getFormatForExtension(file.getName()).orElseGet(() -> {
+            throw new IllegalArgumentException("Could not determine deck export format.");
+        });
+        writeDeck(file, deck, format);
+    }
+
+    public static void writeDeck(File file, DeckCardLists deck, DeckFormats format) throws IOException {
+        writeDeck(file, deck, format.getExporter());
+    }
+
+    public static void writeDeck(File file, DeckCardLists deck, DeckExporter exporter) throws IOException {
+        try (FileOutputStream out = new FileOutputStream(file)){
+            writeDeck(out, deck, exporter);
+        }
+    }
+
+    public static void writeDeck(OutputStream out, DeckCardLists deck, DeckFormats format) {
+        writeDeck(new PrintWriter(out), deck, format);
+    }
+
+    public static void writeDeck(OutputStream out, DeckCardLists deck, DeckExporter exporter) {
+        writeDeck(new PrintWriter(out), deck, exporter);
+    }
+
+    public static void writeDeck(PrintWriter out, DeckCardLists deck, DeckFormats format) {
+        writeDeck(out, deck, format.getExporter());
+    }
+
+    public static void writeDeck(PrintWriter out, DeckCardLists deck, DeckExporter exporter) {
+        exporter.writeDeck(out, deck);
+        out.flush();
+    }
+
+}