JSONUtil

package com.ociweb.json;

import java.util.*;
import net.sf.json.*;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaClass;
import org.apache.commons.beanutils.DynaProperty;

import static com.ociweb.lang.SystemUtil.*;

public class JSONUtil {

  private Map<String, Class> classMap = new HashMap<String, Class>();

  /**
   * Adds a mapping that is used when converting from a JSON map
   * to a Java Bean.  Values of map entries with the given key
   * will be converted to Java Beans with the given Class.
   */
  public void addMapping(String key, Class clazz) {
    classMap.put(key, clazz);
  }

  /**
   * Converts a JSON string representing an array
   * to an array of Java Beans of a given Class.
   */
  public Object[] fromJSONArray(String json, Class clazz) {
    JSONArray ja = JSONArray.fromString(json);
    return JSONArray.toArray(ja, clazz, classMap);
  }

  /**
   * Converts a JSON string representing an array
   * to a java.util.List that contains Java Beans of a given Class.
   */
  public List fromJSONList(String json, Class clazz) {
    JSONArray ja = JSONArray.fromString(json);
    return JSONArray.toList(ja, clazz, classMap);
  }

  /**
   * Converts a JSON string representing an object
   * to a Java Bean object of a given Class.
   */
  public Object fromJSONObject(String json, Class clazz) {
    JSONObject jo = JSONObject.fromString(json);
    return JSONObject.toBean(jo, clazz, classMap);
  }

  /**
   * Pretty prints a JSONArray or JSONObject.
   */
  private void prettyPrint(JSON j) {
    out(j.toString(2));
  }

  /**
   * Pretty prints a JSON string that represents an array.
   */
  public void prettyPrintArray(String json) {
    prettyPrint(JSONArray.fromString(json));
  }

  /**
   * Pretty prints a JSON string that represents an object.
   */
  public void prettyPrintObject(String json) {
    prettyPrint(JSONObject.fromString(json));
  }

  /**
   * Converts a java.util.List to a JSON string.
   */
  public String toJSON(List list) {
    JSONArray ja = JSONArray.fromCollection(list);
    return ja.toString();
  }

  /**
   * Converts a Java Bean to a JSON string.
   */
  public String toJSON(Object object) {
    JSONObject jo = JSONObject.fromObject(object);
    return jo.toString();
  }

  /**
   * Converts an array of booleans, numbers, strings and Java Beans
   * to a JSON string.
   */
  public String toJSON(Object[] array) {
    JSONArray ja = JSONArray.fromArray(array);
    return ja.toString();
  }
}