Remove unused code and change code indentation to 2 spaces.

src/main/java/com/alexfu/sqlitequerybuilder/builder/JoinOnBuilder.java

@@ -20,22 +20,6 @@ public SelectJoinBuilder join(String table) {
     return new SelectJoinBuilder(this, table, JoinType.JOIN);
   }
 
-  public SelectJoinBuilder leftOuterJoin(String table) {
-    return new SelectJoinBuilder(this, table, JoinType.LEFT_OUTER_JOIN);
-  }
-
-  public SelectJoinBuilder crossJoin(String table) {
-    return new SelectJoinBuilder(this, table, JoinType.CROSS_JOIN);
-  }
-
-  public SelectJoinBuilder naturalJoin(String table) {
-    return new SelectJoinBuilder(this, table, JoinType.NATURAL_JOIN);
-  }
-
-  public SelectJoinBuilder naturalLeftOuterJoin(String table) {
-    return new SelectJoinBuilder(this, table, JoinType.NATURAL_LEFT_OUTER_JOIN);
-  }
-
   @Override
   public String build() {
     return StringUtils.join(" ", prefix.build(), "ON", condition);

src/main/java/com/alexfu/sqlitequerybuilder/builder/JoinType.java

@@ -1,19 +1,19 @@
 package com.alexfu.sqlitequerybuilder.builder;
 
 public enum JoinType {
-    JOIN("JOIN"),
-    CROSS_JOIN("CROSS JOIN"),
-    LEFT_OUTER_JOIN("LEFT OUTER JOIN"),
-    NATURAL_JOIN("NATURAL JOIN"),
-    NATURAL_LEFT_OUTER_JOIN("NATURAL LEFT OUTER JOIN");
+  JOIN("JOIN"),
+  CROSS_JOIN("CROSS JOIN"),
+  LEFT_OUTER_JOIN("LEFT OUTER JOIN"),
+  NATURAL_JOIN("NATURAL JOIN"),
+  NATURAL_LEFT_OUTER_JOIN("NATURAL LEFT OUTER JOIN");
 
-    private final String sql;
+  private final String sql;
 
-    JoinType(String sql) {
-        this.sql = sql;
-    }
+  JoinType(String sql) {
+    this.sql = sql;
+  }
 
-    public final String toSQL() {
-        return sql;
-    }
+  public final String toSQL() {
+    return sql;
+  }
 }