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Where all the magic happens
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/*
 * Copyright 2013 eXo Platform SAS
 *
 * 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 juzu.impl.common;

import java.io.IOException;
import java.io.Serializable;
import java.io.StringReader;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

/**
 * A simple JSON object useful for marshalling and unmarshalling data.
 *
 * @author Julien Viet
 */
public final class JSON implements Serializable {

  /** . */
  private static final String[] EMPTY_STRING_ARRAY = new String[0];

  private static final Set> simpleTypes = new HashSet>(Arrays.asList(
    Integer.class,
    Long.class,
    Boolean.class
  ));

  public static JSON json() {
    return new JSON();
  }

  /** . */
  private final TreeMap entries = new TreeMap();

  public Set names() {
    return entries.keySet();
  }

  public Object get(String name) {
    return entries.get(name);
  }

  public String getString(String name) {
    return (String)entries.get(name);
  }

  public List getList(String name) {
    return (List)entries.get(name);
  }

  public Integer getInteger(String name) {
    return (Integer)entries.get(name);
  }

  public  List getList(String name, Class elementType) {
    List entry = (List)entries.get(name);
    int len = entry != null ? entry.size() : 0;
    for (int i = 0;i < len;i++) {
      Object obj = entry.get(i);
      if (!elementType.isInstance(obj)) {
        throw new ClassCastException("Cannot cast " + obj + "with class " + obj.getClass().getName() + " to class " + elementType.getName());
      }
    }
    return (List)entry;
  }

  public  E[] getArray(String name, Class elementType) {
    List entry = (List)entries.get(name);
    if (entry == null) {
      return (E[])Array.newInstance(elementType, 0);
    }
    else {
      int len = entry.size();
      Object array = Array.newInstance(elementType, len);
      for (int i = 0;i < len;i++) {
        Object obj = entry.get(i);
        if (!elementType.isInstance(obj)) {
          throw new ClassCastException("Cannot cast " + obj + "with class " + obj.getClass().getName() + " to class " + elementType.getName());
        }
        Array.set(array, i, obj);
      }
      return (E[])array;
    }
  }

  public Boolean getBoolean(String name) {
    return (Boolean)entries.get(name);
  }

  public JSON getJSON(String name) {
    return (JSON)entries.get(name);
  }

  public boolean contains(String name) {
    return entries.containsKey(name);
  }

  public JSON clear() {
    entries.clear();
    return this;
  }

  public int getSize() {
    return entries.size();
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == this) {
      return true;
    }
    if (obj instanceof JSON) {
      JSON that = (JSON)obj;
      return entries.equals(that.entries);
    }
    return false;
  }

  public  JSON merge(JSON json) {
    return merge(json.entries);
  }

  public  JSON merge(Map map) {
    for (Map.Entry entry : map.entrySet()) {
      set(entry.getKey(), entry.getValue());
    }
    return this;
  }

  public  JSON map(String name, Map map) {
    return set(name, map);
  }

  public JSON list(String name) {
    return set(name, EMPTY_STRING_ARRAY);
  }

  public  JSON list(String name, E... elements) {
    return set(name, elements);
  }

  public  JSON map(String name, Iterable elements) {
    return set(name, elements);
  }

  public JSON set(String name, Object o) {
    entries.put(name, unwrap(o));
    return this;
  }

  public TreeMap build() {
    TreeMap ret = new TreeMap(entries);
    for (java.util.Map.Entry entry : ret.entrySet()) {
      Object value = entry.getValue();
      if (value instanceof JSON) {
        JSON json = (JSON)value;
        entry.setValue(json.build());
      }
    }
    return ret;
  }

  private static Object unwrap(Object o) {
    if (o == null || o instanceof JSON) {
      // Ok
    }
    else {
      Class type = o.getClass();

      //
      if (simpleTypes.contains(type)) {
        // Ok
      }
      else {
        if (o instanceof Map) {
          Map map = (Map)o;
          JSON json = new JSON();
          for (Map.Entry entry : map.entrySet()) {
            String name = entry.getKey().toString();
            Object value = unwrap(entry.getValue());
            json.entries.put(name, value);
          }
          o = json;
        }
        else if (o instanceof Iterable) {
          ArrayList