Util: add functions for serialising YAML maps.

src/main/java/moe/nekojimi/chords/Util.java

@@ -1,6 +1,14 @@
 package moe.nekojimi.chords;
 
+import com.amihaiemil.eoyaml.Yaml;
+import com.amihaiemil.eoyaml.YamlMapping;
+import com.amihaiemil.eoyaml.YamlMappingBuilder;
+import com.amihaiemil.eoyaml.YamlNode;
 import java.nio.ByteBuffer;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.function.Function;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -31,6 +39,26 @@ public class Util
     private static final Pattern SIZE_PATTERN = Pattern.compile("\\b([0-9]+\\.?[0-9]*)([kkMmGg])i?[bB]\\b");
     private static final Pattern SAMPLE_RATE_PATTERN = Pattern.compile("\\b([0-9]+)k(b(ps?))?\\b");
 
+    public static <V> Map<String, V> yamlMappingToMap(YamlMapping mapping, Function<YamlNode, V> fromYamlFunction)
+    {
+        Map<String, V> ret = new HashMap<>();
+        for (YamlNode key : mapping.keys())
+        {
+            ret.put(key.asScalar().value(), fromYamlFunction.apply(mapping.value(key)));
+        }
+        return ret;
+    }
+
+    public static <K, V> YamlMapping mapToMapping(Map<K, V> map, Function<V, YamlNode> toYamlFunction)
+    {
+        YamlMappingBuilder builder = Yaml.createYamlMappingBuilder();
+        for (Entry<K, V> e : map.entrySet())
+        {
+            builder = builder.add(e.getKey().toString(), toYamlFunction.apply(e.getValue()));
+        }
+        return builder.build();
+    }
+
     public static String printSamples(ByteBuffer buf)
     {
         StringBuilder sb = new StringBuilder();