Conform to the project's singleton pattern.

src/main/java/com/moandjiezana/toml/ArrayValueWriter.java

@@ -5,6 +5,8 @@ import java.lang.reflect.Array;
 import java.util.ArrayList;
 import java.util.Collection;
 
+import static com.moandjiezana.toml.ValueWriters.WRITERS;
+
 abstract class ArrayValueWriter implements ValueWriter {
   static protected boolean isArrayish(Object value) {
     return value instanceof Collection || value.getClass().isArray();
@@ -23,7 +25,7 @@ abstract class ArrayValueWriter implements ValueWriter {
   static boolean isArrayOfPrimitive(Object array) {
     Object first = peek(array);
     if (first != null) {
-      ValueWriter valueWriter = ValueWriters.findWriterFor(first);
+      ValueWriter valueWriter = WRITERS.findWriterFor(first);
       return valueWriter.isPrimitiveType() || isArrayish(first);
     }
 

src/main/java/com/moandjiezana/toml/MapValueWriter.java

@@ -6,6 +6,7 @@ import java.util.regex.Pattern;
 
 import static com.moandjiezana.toml.PrimitiveArrayValueWriter.PRIMITIVE_ARRAY_VALUE_WRITER;
 import static com.moandjiezana.toml.TableArrayValueWriter.TABLE_ARRAY_VALUE_WRITER;
+import static com.moandjiezana.toml.ValueWriters.WRITERS;
 
 class MapValueWriter implements ValueWriter {
   static final ValueWriter MAP_VALUE_WRITER = new MapValueWriter();
@@ -33,7 +34,7 @@ class MapValueWriter implements ValueWriter {
         continue;
       }
 
-      ValueWriter valueWriter = ValueWriters.findWriterFor(fromValue);
+      ValueWriter valueWriter = WRITERS.findWriterFor(fromValue);
       if (valueWriter.isPrimitiveType()) {
         context.indent();
         context.output.append(quoteKey(key)).append(" = ");
@@ -53,7 +54,7 @@ class MapValueWriter implements ValueWriter {
         continue;
       }
 
-      ValueWriter valueWriter = ValueWriters.findWriterFor(fromValue);
+      ValueWriter valueWriter = WRITERS.findWriterFor(fromValue);
       if (valueWriter.isTable() || valueWriter == TABLE_ARRAY_VALUE_WRITER) {
         valueWriter.write(fromValue, context.extend(quoteKey(key)));
       }
@@ -87,7 +88,7 @@ class MapValueWriter implements ValueWriter {
         continue;
       }
 
-      ValueWriter valueWriter = ValueWriters.findWriterFor(fromValue);
+      ValueWriter valueWriter = WRITERS.findWriterFor(fromValue);
       if (valueWriter.isPrimitiveType() || valueWriter == PRIMITIVE_ARRAY_VALUE_WRITER) {
         return true;
       }
@@ -95,4 +96,6 @@ class MapValueWriter implements ValueWriter {
 
     return false;
   }
+
+  private MapValueWriter() {}
 }

src/main/java/com/moandjiezana/toml/ObjectValueWriter.java

@@ -72,4 +72,6 @@ class ObjectValueWriter implements ValueWriter {
 
     return value;
   }
+
+  private ObjectValueWriter() {}
 }

src/main/java/com/moandjiezana/toml/PrimitiveArrayValueWriter.java

@@ -20,9 +20,11 @@ class PrimitiveArrayValueWriter extends ArrayValueWriter {
       if (!first) {
         context.output.append(", ");
       }
-      ValueWriters.write(elem, context);
+      ValueWriters.WRITERS.write(elem, context);
       first = false;
     }
     context.output.append(" ]");
   }
+
+  private PrimitiveArrayValueWriter() {}
 }

src/main/java/com/moandjiezana/toml/TableArrayValueWriter.java

@@ -2,6 +2,8 @@ package com.moandjiezana.toml;
 
 import java.util.Collection;
 
+import static com.moandjiezana.toml.ValueWriters.WRITERS;
+
 class TableArrayValueWriter extends ArrayValueWriter {
   static final ValueWriter TABLE_ARRAY_VALUE_WRITER = new TableArrayValueWriter();
 
@@ -17,7 +19,9 @@ class TableArrayValueWriter extends ArrayValueWriter {
     WriterContext subContext = context.extend().setIsArrayOfTable(true);
 
     for (Object elem : values) {
-      ValueWriters.write(elem, subContext);
+      WRITERS.write(elem, subContext);
     }
   }
+
+  private TableArrayValueWriter() {}
 }

src/main/java/com/moandjiezana/toml/TomlWriter.java

@@ -4,6 +4,8 @@ import java.io.*;
 import java.util.List;
 import java.util.Map;
 
+import static com.moandjiezana.toml.ValueWriters.WRITERS;
+
 /**
  * <p>Converts Objects to TOML</p>
  *
@@ -34,7 +36,7 @@ public class TomlWriter {
    * @return a string containing the TOML representation of the given Object
    */
   public String write(Object from) {
-    return ValueWriters.write(from);
+    return WRITERS.write(from);
   }
 
   /**

src/main/java/com/moandjiezana/toml/ValueWriters.java

@@ -11,7 +11,9 @@ import static com.moandjiezana.toml.TableArrayValueWriter.TABLE_ARRAY_VALUE_WRIT
 
 class ValueWriters {
 
-  static ValueWriter findWriterFor(Object value) {
+  static final ValueWriters WRITERS = new ValueWriters();
+
+  ValueWriter findWriterFor(Object value) {
     for (ValueWriter valueWriter : VALUE_WRITERs) {
       if (valueWriter.canWrite(value)) {
         return valueWriter;
@@ -21,14 +23,14 @@ class ValueWriters {
     return OBJECT_VALUE_WRITER;
   }
 
-  static String write(Object value) {
+  String write(Object value) {
     WriterContext context = new WriterContext();
     write(value, context);
 
     return context.output.toString();
   }
 
-  static void write(Object value, WriterContext context) {
+  void write(Object value, WriterContext context) {
     findWriterFor(value).write(value, context);
   }