Created TomlWriter.Builder, so TomlWriter and IndentationPolicy can be

immutable

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

@@ -98,7 +98,6 @@ class DateConverter implements ValueConverter, ValueWriter {
       dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:m:ss");
     }
     dateFormat.setTimeZone(context.getTomlWriter().getTimeZone());
-
     context.write(dateFormat.format(value));
 
     if (customDateFormat == null) {

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

@@ -17,9 +17,7 @@ class PrimitiveArrayValueWriter extends ArrayValueWriter {
     Collection values = normalize(value);
 
     context.write('[');
-    if (!context.getTomlWriter().wantTerseArrays()) {
-      context.write(' ');
-    }
+    context.writeArrayDelimiterPadding();
 
     boolean first = true;
     ValueWriter firstWriter = null;
@@ -43,9 +41,7 @@ class PrimitiveArrayValueWriter extends ArrayValueWriter {
       WRITERS.write(elem, context);
     }
 
-    if (!context.getTomlWriter().wantTerseArrays()) {
-      context.write(' ');
-    }
+    context.writeArrayDelimiterPadding();
     context.write(']');
   }
 

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

@@ -34,15 +34,52 @@ import java.util.TimeZone;
  */
 public class TomlWriter {
   
-  private WriterIndentationPolicy indentationPolicy = new WriterIndentationPolicy();
-  private boolean wantTerseArraysValue = false;
+  public static class Builder {
+    private int keyIndentation;
+    private int tableIndentation;
+    private int arrayDelimiterPadding = 0;
+    
+    public TomlWriter.Builder indentValuesBy(int spaces) {
+      this.keyIndentation = spaces;
+      
+      return this;
+    }
+
+    public TomlWriter.Builder indentTablesBy(int spaces) {
+      this.tableIndentation = spaces;
+      
+      return this;
+    }
+    
+    /**
+     * @param spaces number of spaces to put between opening square bracket and first item and between closing square bracket and last item
+     * @return this TomlWriter.Builder instance
+     */
+    public TomlWriter.Builder padArrayDelimitersBy(int spaces) {
+      this.arrayDelimiterPadding = spaces;
+      
+      return this;
+    }
+    
+    public TomlWriter build() {
+      return new TomlWriter(keyIndentation, tableIndentation, arrayDelimiterPadding);
+    }
+  }
+
+  private final WriterIndentationPolicy indentationPolicy;
   private GregorianCalendar calendar = new GregorianCalendar();
   private DateFormat customDateFormat = null;
 
   /**
    * Creates a TomlWriter instance.
    */
-  public TomlWriter() {}
+  public TomlWriter() {
+    this(0, 0, 0);
+  }
+  
+  private TomlWriter(int keyIndentation, int tableIndentation, int arrayDelimiterPadding) {
+    this.indentationPolicy = new WriterIndentationPolicy(keyIndentation, tableIndentation, arrayDelimiterPadding);
+  }
 
   /**
    * Write an Object into TOML String.
@@ -105,50 +142,6 @@ public class TomlWriter {
     return indentationPolicy;
   }
 
-  /**
-   * Set the {@link WriterIndentationPolicy} for this writer.
-   *
-   * If unset, the default policy (no indentation) is used.
-   *
-   * @param indentationPolicy the new policy
-   * @return this TomlWriter instance
-   */
-  public TomlWriter setIndentationPolicy(WriterIndentationPolicy indentationPolicy) {
-    this.indentationPolicy = indentationPolicy;
-    return this;
-  }
-
-  /**
-   * <p>Control whitespace in arrays in the TOML output.</p>
-   *
-   * <p>Terse arrays = false (default):</p>
-   *
-   * <pre><code>
-   *   a = [ 1, 2, 3 ]
-   * </code></pre>
-   *
-   * <p>Terse arrays = true:</p>
-   *
-   * <pre><code>
-   *   a = [1,2,3]
-   * </code></pre>
-   *
-   * @param value terse arrays setting
-   * @return this TomlWriter instance
-   */
-  public TomlWriter wantTerseArrays(boolean value) {
-    this.wantTerseArraysValue = value;
-    return this;
-  }
-
-  /**
-   * Get the current array whitespace policy
-   * @return the current policy
-   */
-  public boolean wantTerseArrays() {
-    return wantTerseArraysValue;
-  }
-
   /**
    * Set the {@link TimeZone} used when formatting datetimes.
    *

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

@@ -93,6 +93,12 @@ class WriterContext {
     }
   }
 
+  void writeArrayDelimiterPadding() {
+    for (int i = 0; i < tomlWriter.getIndentationPolicy().getArrayDelimiterPadding(); i++) {
+      write(' ');
+    }
+  }
+
   void indent() {
     if (!key.isEmpty()) {
       write(currentFieldIndent);

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

@@ -5,37 +5,26 @@ package com.moandjiezana.toml;
  *
  * The default policy is to not indent.
  */
-public class WriterIndentationPolicy {
-  private int tableIndent = 0;
-  private int keyValueIndent = 0;
+class WriterIndentationPolicy {
+  private final int tableIndent;
+  private final int keyValueIndent;
+  private final int arrayDelimiterPadding;
 
-  public int getTableIndent() {
+  WriterIndentationPolicy(int keyIndentation, int tableIndentation, int arrayDelimiterPadding) {
+    this.keyValueIndent = keyIndentation;
+    this.tableIndent = tableIndentation;
+    this.arrayDelimiterPadding = arrayDelimiterPadding;
+  }
+
+  int getTableIndent() {
     return tableIndent;
   }
 
-  /**
-   * Sets the number of spaces a nested table name is indented.
-   *
-   * @param tableIndent number of spaces to indent
-   * @return this WriterIndentationPolicy instance
-   */
-  public WriterIndentationPolicy setTableIndent(int tableIndent) {
-    this.tableIndent = tableIndent;
-    return this;
-  }
-
-  public int getKeyValueIndent() {
+  int getKeyValueIndent() {
     return keyValueIndent;
   }
 
-  /**
-   * Sets the number of spaces key/value pairs within a table are indented.
-   *
-   * @param keyValueIndent number of spaces to indent
-   * @return this WriterIndentationPolicy instance
-   */
-  public WriterIndentationPolicy setKeyValueIndent(int keyValueIndent) {
-    this.keyValueIndent = keyValueIndent;
-    return this;
+  int getArrayDelimiterPadding() {
+    return arrayDelimiterPadding;
   }
 }

src/test/java/com/moandjiezana/toml/BurntSushiValidEncoderTest.java

@@ -114,7 +114,7 @@ public class BurntSushiValidEncoderTest {
   public void table_array_nest_modified() throws Exception {
     // Modified to remove stray spaces in the expected TOML
     runEncoder("table-array-nest-modified",
-        new TomlWriter().setIndentationPolicy(new WriterIndentationPolicy().setTableIndent(2)));
+        new TomlWriter.Builder().indentTablesBy(2).build());
   }
 
   @Test
@@ -126,8 +126,8 @@ public class BurntSushiValidEncoderTest {
 
   private void runEncoder(String testName) {
     runEncoder(testName,
-        new TomlWriter().
-            wantTerseArrays(true).
+        new TomlWriter.Builder().
+            build().
             setTimeZone(TimeZone.getTimeZone("UTC")).
             setDateFormat(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'")));
   }

src/test/java/com/moandjiezana/toml/TomlWriterTest.java

@@ -123,9 +123,10 @@ public class TomlWriterTest {
 
   @Test
   public void should_follow_indentation_policy_of_indented_values() {
-    String output = new TomlWriter().
-        setIndentationPolicy(new WriterIndentationPolicy().setKeyValueIndent(2)).
-        write(buildNestedMap());
+    String output = new TomlWriter.Builder().
+      indentValuesBy(2).
+      build().
+      write(buildNestedMap());
     String expected = "aBoolean = true\n\n" +
         "[aMap]\n" +
         "  foo = 1\n" +
@@ -140,9 +141,10 @@ public class TomlWriterTest {
 
   @Test
   public void should_follow_indentation_policy_of_indented_tables() {
-    String output = new TomlWriter().
-        setIndentationPolicy(new WriterIndentationPolicy().setTableIndent(2)).
-        write(buildNestedMap());
+    String output = new TomlWriter.Builder().
+      indentTablesBy(2).
+      build().
+      write(buildNestedMap());
     String expected = "aBoolean = true\n\n" +
         "[aMap]\n" +
         "foo = 1\n" +
@@ -157,9 +159,11 @@ public class TomlWriterTest {
 
   @Test
   public void should_follow_indentation_policy_of_indented_tables_and_values() {
-    String output = new TomlWriter().
-        setIndentationPolicy(new WriterIndentationPolicy().setTableIndent(2).setKeyValueIndent(2)).
-        write(buildNestedMap());
+    String output = new TomlWriter.Builder().
+      indentValuesBy(2).
+      indentTablesBy(2).
+      build().
+      write(buildNestedMap());
     String expected = "aBoolean = true\n\n" +
         "[aMap]\n" +
         "  foo = 1\n" +
@@ -202,7 +206,7 @@ public class TomlWriterTest {
     }
     ArrayTest arrayTest = new ArrayTest();
 
-    String output = new TomlWriter().write(arrayTest);
+    String output = new TomlWriter.Builder().padArrayDelimitersBy(1).build().write(arrayTest);
     String expected = "array = [ [ 1, 2, 3 ], [ 4, 5, 6 ] ]\n";
     assertEquals(expected, output);
   }
@@ -216,7 +220,7 @@ public class TomlWriterTest {
     o.aList.add(1);
     o.aList.add(2);
 
-    assertEquals("aList = [ 1, 2 ]\n", new TomlWriter().write(o));
+    assertEquals("aList = [ 1, 2 ]\n", new TomlWriter.Builder().padArrayDelimitersBy(1).build().write(o));
   }
 
   @Test