Add optJSONArray method to JSONObject with a default value

src/main/java/org/json/JSONArray.java

@@ -924,30 +924,57 @@ public BigDecimal optBigDecimal(int index, BigDecimal defaultValue) {
     }
 
     /**
-     * Get the optional JSONArray associated with an index.
+     * Get the optional JSONArray associated with an index. Null is returned if
+     * there is no value at that index or if the value is not a JSONArray.
      *
      * @param index
-     *            subscript
-     * @return A JSONArray value, or null if the index has no value, or if the
-     *         value is not a JSONArray.
+     *            The index must be between 0 and length() - 1.
+     * @return A JSONArray value.
      */
     public JSONArray optJSONArray(int index) {
-        Object o = this.opt(index);
-        return o instanceof JSONArray ? (JSONArray) o : null;
+        return this.optJSONArray(index, null);
+    }
+
+    /**
+     * Get the optional JSONArray associated with an index. The defaultValue is returned if
+     * there is no value at that index or if the value is not a JSONArray.
+     *
+     * @param index
+     *            The index must be between 0 and length() - 1.
+     * @param defaultValue
+     *            The default.
+     * @return A JSONArray value.
+     */
+    public JSONArray optJSONArray(int index, JSONArray defaultValue) {
+        Object object = this.opt(index);
+        return object instanceof JSONArray ? (JSONArray) object : defaultValue;
     }
 
     /**
      * Get the optional JSONObject associated with an index. Null is returned if
-     * the key is not found, or null if the index has no value, or if the value
-     * is not a JSONObject.
+     * there is no value at that index or if the value is not a JSONObject.
      *
      * @param index
      *            The index must be between 0 and length() - 1.
      * @return A JSONObject value.
      */
     public JSONObject optJSONObject(int index) {
-        Object o = this.opt(index);
-        return o instanceof JSONObject ? (JSONObject) o : null;
+        return this.optJSONObject(index, null);
+    }
+
+    /**
+     * Get the optional JSONObject associated with an index. The defaultValue is returned if
+     * there is no value at that index or if the value is not a JSONObject.
+     *
+     * @param index
+     *            The index must be between 0 and length() - 1.
+     * @param defaultValue
+     *            The default.
+     * @return A JSONObject value.
+     */
+    public JSONObject optJSONObject(int index, JSONObject defaultValue) {
+        Object object = this.opt(index);
+        return object instanceof JSONObject ? (JSONObject) object : defaultValue;
     }
 
     /**

src/main/java/org/json/JSONObject.java

@@ -1512,8 +1512,22 @@ public Integer optIntegerObject(String key, Integer defaultValue) {
      * @return A JSONArray which is the value.
      */
     public JSONArray optJSONArray(String key) {
-        Object o = this.opt(key);
-        return o instanceof JSONArray ? (JSONArray) o : null;
+        return this.optJSONArray(key, null);
+    }
+
+    /**
+     * Get an optional JSONArray associated with a key, or the default if there
+     * is no such key, or if its value is not a JSONArray.
+     *
+     * @param key
+     *            A key string.
+     * @param defaultValue
+     *            The default.
+     * @return A JSONArray which is the value.
+     */
+    public JSONArray optJSONArray(String key, JSONArray defaultValue) {
+        Object object = this.opt(key);
+        return object instanceof JSONArray ? (JSONArray) object : defaultValue;
     }
 
     /**

src/test/java/org/json/junit/JSONArrayTest.java

@@ -595,13 +595,17 @@ public void opt() {
 
         JSONArray nestedJsonArray = jsonArray.optJSONArray(9);
         assertTrue("Array opt JSONArray", nestedJsonArray != null);
-        assertTrue("Array opt JSONArray default", 
+        assertTrue("Array opt JSONArray null",
                 null == jsonArray.optJSONArray(99));
+        assertTrue("Array opt JSONArray default",
+                "value".equals(jsonArray.optJSONArray(99, new JSONArray("[\"value\"]")).getString(0)));
 
         JSONObject nestedJsonObject = jsonArray.optJSONObject(10);
         assertTrue("Array opt JSONObject", nestedJsonObject != null);
-        assertTrue("Array opt JSONObject default", 
+        assertTrue("Array opt JSONObject null",
                 null == jsonArray.optJSONObject(99));
+        assertTrue("Array opt JSONObject default",
+                "value".equals(jsonArray.optJSONObject(99, new JSONObject("{\"key\":\"value\"}")).getString("key")));
 
         assertTrue("Array opt long",
                 0 == jsonArray.optLong(11));

src/test/java/org/json/junit/JSONObjectTest.java

@@ -2510,6 +2510,8 @@ public void jsonObjectOptDefault() {
                 MyEnum.VAL1.equals(jsonObject.optEnum(MyEnum.class, "myKey", MyEnum.VAL1)));
         assertTrue("optJSONArray() should return null ",
                 null==jsonObject.optJSONArray("myKey"));
+        assertTrue("optJSONArray() should return default JSONArray",
+                "value".equals(jsonObject.optJSONArray("myKey", new JSONArray("[\"value\"]")).getString(0)));
         assertTrue("optJSONObject() should return default JSONObject ",
                 jsonObject.optJSONObject("myKey", new JSONObject("{\"testKey\":\"testValue\"}")).getString("testKey").equals("testValue"));
         assertTrue("optLong() should return default long",
@@ -2555,6 +2557,8 @@ public void jsonObjectOptNoKey() {
                  Integer.valueOf(42).equals(jsonObject.optIntegerObject("myKey", 42)));
          assertTrue("optEnum() should return default Enum",
                  MyEnum.VAL1.equals(jsonObject.optEnum(MyEnum.class, "myKey", MyEnum.VAL1)));
+         assertTrue("optJSONArray() should return default JSONArray",
+                 "value".equals(jsonObject.optJSONArray("myKey", new JSONArray("[\"value\"]")).getString(0)));
          assertTrue("optJSONArray() should return null ",
                  null==jsonObject.optJSONArray("myKey"));
          assertTrue("optJSONObject() should return default JSONObject ",