JSONConverter.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.turro.elephant.impl.util;
 
import java.lang.reflect.Array;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
 
public class JSONConverter {
  private StringBuffer result;
  
  public JSONConverter() {
  }
 
  public String toJSON(Object javaObject) {
    result = new StringBuffer();
    processObject(javaObject);
    return result.toString();
  }
 
  private void processObject(Object javaObject) {
    if(javaObject instanceof Array) {
      processArray(javaObject);
    }
    else if(javaObject instanceof Map) {
      processMap(javaObject);
    }
    else if(javaObject instanceof List) {
      processList(javaObject);
    }
    else if(javaObject instanceof String) {
      processString(javaObject);
    }
    else if(javaObject instanceof Number) {
      processNumber(javaObject);
    }
    else if(javaObject instanceof Character) {
      processCharacter(javaObject);
    }
  }
 
  private void processArray(Object javaObject) {
    Array array = (Array)javaObject;
    result.append("[");
    boolean first = true;
    for(int i = 0; i < Array.getLength(array); i++) {
      if(!first) result.append(",");
      processObject(Array.get(array, i));
      first = false;
    }
    result.append("]");
  }
 
  private void processMap(Object javaObject) {
    Map map = (Map)javaObject;
    Iterator it = map.keySet().iterator();
    result.append("[");
    Object obj;
    boolean first = true;
    while(it.hasNext()) {
      if(!first) result.append(",");
      obj = it.next();
      result.append("[");
      processObject(obj);
      result.append(",");
      processObject(map.get(obj));
      result.append("]");
      first = false;
    }
    result.append("]");
  }
  
  private void processList(Object javaObject) {
    List list = (List)javaObject;
    Iterator it = list.iterator();
    result.append("[");
    boolean first = true;
    while(it.hasNext()) {
      if(!first) result.append(",");
      processObject(it.next());
      first = false;
    }
    result.append("]");
  }
 
  private void processString(Object javaObject) {
    result.append("\"" + (String)javaObject + "\"");
  }
 
  private void processNumber(Object javaObject) {
    result.append("\"" + ((Number)javaObject).toString() + "\"");
  }
 
  private void processCharacter(Object javaObject) {
    result.append("'" + ((Character)javaObject).toString() + "'");
  } 
  
}