/*
* Copyright 2004-2010 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
package org.slim3.datastore.json;
import com.google.appengine.repackaged.org.json.JSONArray;
import com.google.appengine.repackaged.org.json.JSONException;
import com.google.appengine.repackaged.org.json.JSONObject;
/**
* JSON array reader.
*
* @author Takao Nakaguchi
*
* @since 1.0.6
*/
public class JsonArrayReader extends JsonReader {
/**
* The constructor.
*
* @param json the JSON string
* @param modelReader the model reader
*/
public JsonArrayReader(String json, ModelReader modelReader){
super(modelReader);
try{
this.array = new JSONArray(json);
} catch(JSONException e){
}
}
/**
* The constructor.
*
* @param array the JSON array
* @param modelReader the model reader
*/
JsonArrayReader(JSONArray array, ModelReader modelReader){
super(modelReader);
this.array = array;
}
/**
* Returns the length.
*
* @return length
*/
public int length(){
if(array == null) return 0;
return array.length();
}
/**
* Sets the index.
*
* @param index the index
*/
public void setIndex(int index){
this.index = index;
}
@Override
public String read(){
if(array == null) return null;
return array.optString(index, null);
}
@Override
public String readProperty(String name){
if(array == null) return null;
JSONObject o = array.optJSONObject(index);
if(o == null) return null;
return o.optString(name, null);
}
/**
* Create the new JSONRootReader on the current index.
*
* @return JSONRootReader
*/
public JsonRootReader newRootReader(){
JSONObject o = array.optJSONObject(index);
if(o == null) return null;
return new JsonRootReader(o, getModelReader());
}
private JSONArray array;
private int index;
}