package ESU.list;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.Vector;

import org.json.JSONObject;
import org.json.XML;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
//作者+ 著作权人： 罗瑶光，浏阳，
public class List_ESU{
  public static String listToJsonString(Gson gson, List<Object> list){
    return gson.toJson(list);
  }

  public static Object stringListToJsonString(Gson gson, List<String> list) {
    return gson.toJson(list);
  }

  public static String listToXml(Gson gson, List<Object> list){
    return XML.toString(new JSONObject(gson.toJson(list)));
  }

  public static String listToMap(Gson gson, List<Object> list){
    return gson.fromJson(new JSONObject(gson.toJson(list)).toString()
        , new TypeToken<Map<String, Object>>(){}.getType());
  }

  public static Object[] listToObjectArray(List<Object> list){
    return list.toArray();
  }
  
  public static String[] stringlistToStringArray(List<String> list){  
    String[] strings= new String[list.size()];
    Iterator<String> iterator= list.iterator();
    int i= 0;
    while(iterator.hasNext()) {
      strings[i++]= iterator.next().toString();
    }
    return strings;
  }

  public static Iterator<Object> listToIterator(List<Object> list){
    return list.iterator();
  }

  public static Vector<Object> listToVector(List<Object> list){
    Vector<Object> vector= new Vector<>();
    Iterator<Object> iterator= list.iterator();
    while(iterator.hasNext()) {
      vector.add(iterator.next());
    }
    return vector;
  }

  public static Set<Object> listToSet(List<Object> list){
    Set<Object> sets= new TreeSet<>();
    Iterator<Object> iterator= list.iterator();
    while(iterator.hasNext()) {
      sets.add(iterator.next());
    }
    return sets;
  }

  public static String[] listToArray(List<String> list) {
    String[] output= new String[list.size()];
    int outputPoint= 0;
    Iterator<String> iterator= list.iterator();
    while(iterator.hasNext()) {
      output[outputPoint++]= iterator.next();
    }
    return output;
  }
}