Add getStringCascade getJSONObjectCascade for JSONUtils

Author: Trinea

src/cn/trinea/android/common/util/JSONUtils.java

@@ -309,6 +309,62 @@ public static String getString(String jsonData, String key, String defaultValue)
         }
     }
 
+    /**
+     * get String from jsonObject
+     * 
+     * @param jsonObject
+     * @param defaultValue
+     * @param keyArray
+     * @return <ul>
+     *         <li>if jsonObject is null, return defaultValue</li>
+     *         <li>if keyArray is null or empty, return defaultValue</li>
+     *         <li>get {@link #getJSONObject(JSONObject, String, JSONObject)} by recursion, return it. if anyone is
+     *         null, return directly</li>
+     *         </ul>
+     */
+    public static String getStringCascade(JSONObject jsonObject, String defaultValue, String... keyArray) {
+        if (jsonObject == null || ArrayUtils.isEmpty(keyArray)) {
+            return defaultValue;
+        }
+
+        String data = jsonObject.toString();
+        for (String key : keyArray) {
+            data = getStringCascade(data, key, defaultValue);
+            if (data == null) {
+                return defaultValue;
+            }
+        }
+        return data;
+    }
+
+    /**
+     * get String from jsonData
+     * 
+     * @param jsonData
+     * @param defaultValue
+     * @param keyArray
+     * @return <ul>
+     *         <li>if jsonData is null, return defaultValue</li>
+     *         <li>if keyArray is null or empty, return defaultValue</li>
+     *         <li>get {@link #getJSONObject(JSONObject, String, JSONObject)} by recursion, return it. if anyone is
+     *         null, return directly</li>
+     *         </ul>
+     */
+    public static String getStringCascade(String jsonData, String defaultValue, String... keyArray) {
+        if (StringUtils.isEmpty(jsonData)) {
+            return defaultValue;
+        }
+
+        String data = jsonData;
+        for (String key : keyArray) {
+            data = getString(data, key, defaultValue);
+            if (data == null) {
+                return defaultValue;
+            }
+        }
+        return data;
+    }
+
     /**
      * get String array from jsonObject
      * 
@@ -474,7 +530,7 @@ public static JSONObject getJSONObject(JSONObject jsonObject, String key, JSONOb
      * @param key
      * @param defaultValue
      * @return <ul>
-     *         <li>if jsonObject is null, return defaultValue</li>
+     *         <li>if jsonData is null, return defaultValue</li>
      *         <li>if jsonData {@link JSONObject#JSONObject(String)} exception, return defaultValue</li>
      *         <li>return {@link JSONUtils#getJSONObject(JSONObject, String, JSONObject)}</li>
      *         </ul>
@@ -495,6 +551,63 @@ public static JSONObject getJSONObject(String jsonData, String key, JSONObject d
         }
     }
 
+    /**
+     * get JSONObject from jsonObject
+     * 
+     * @param jsonObject
+     * @param defaultValue
+     * @param keyArray
+     * @return <ul>
+     *         <li>if jsonObject is null, return defaultValue</li>
+     *         <li>if keyArray is null or empty, return defaultValue</li>
+     *         <li>get {@link #getJSONObject(JSONObject, String, JSONObject)} by recursion, return it. if anyone is
+     *         null, return directly</li>
+     *         </ul>
+     */
+    public static JSONObject getJSONObjectCascade(JSONObject jsonObject, JSONObject defaultValue, String... keyArray) {
+        if (jsonObject == null || ArrayUtils.isEmpty(keyArray)) {
+            return defaultValue;
+        }
+
+        JSONObject js = jsonObject;
+        for (String key : keyArray) {
+            js = getJSONObject(js, key, defaultValue);
+            if (js == null) {
+                return defaultValue;
+            }
+        }
+        return js;
+    }
+
+    /**
+     * get JSONObject from jsonData
+     * 
+     * @param jsonData
+     * @param defaultValue
+     * @param keyArray
+     * @return <ul>
+     *         <li>if jsonData is null, return defaultValue</li>
+     *         <li>if keyArray is null or empty, return defaultValue</li>
+     *         <li>get {@link #getJSONObject(JSONObject, String, JSONObject)} by recursion, return it. if anyone is
+     *         null, return directly</li>
+     *         </ul>
+     */
+    public static JSONObject getJSONObjectCascade(String jsonData, JSONObject defaultValue, String... keyArray) {
+        if (StringUtils.isEmpty(jsonData)) {
+            return defaultValue;
+        }
+
+        try {
+            JSONObject jsonObject = new JSONObject(jsonData);
+            return getJSONObjectCascade(jsonObject, defaultValue, keyArray);
+        } catch (JSONException e) {
+            if (isPrintException) {
+                e.printStackTrace();
+            }
+            return defaultValue;
+        }
+    }
+
     /**
      * get JSONArray from jsonObject
      *