gov.nih.nci.cabig.caaers.utils.JSONUtils.java Source code

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Here is the source code for gov.nih.nci.cabig.caaers.utils.JSONUtils.java

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/*******************************************************************************
 * Copyright SemanticBits, Northwestern University and Akaza Research
 * 
 * Distributed under the OSI-approved BSD 3-Clause License.
 * See http://ncip.github.com/caaers/LICENSE.txt for details.
 ******************************************************************************/
package gov.nih.nci.cabig.caaers.utils;

import org.apache.commons.beanutils.BeanUtils;

import java.lang.reflect.Method;
import java.util.*;

/**
 * @author: Biju Joseph
 */
public class JSONUtils {

    private static char delimiter = '"';
    private static char colon = ':';

    public static String toJSON(int[] arr) {
        if (arr == null)
            return "[]";
        StringBuilder sb = new StringBuilder("[");
        for (int i = 0; i < arr.length; i++) {
            if (i > 0)
                sb.append(",");
            sb.append(arr[i]);
        }
        return sb.append("]").toString();
    }

    public static Map<String, Object> describe(Object o) {
        Map<String, Object> m = new LinkedHashMap<String, Object>();
        Method[] methods = o.getClass().getMethods();
        for (Method method : methods) {
            String name = method.getName();
            if (!name.startsWith("get"))
                continue;
            name = name.substring(3);
            String firstChar = "" + name.charAt(0);
            name = firstChar.toLowerCase() + name.substring(1);
            Object value = null;
            try {
                value = method.invoke(o);
            } catch (Exception ignore) {

            }
            if (name.equals("class"))
                value = String.valueOf(value);
            m.put(name, value);

        }
        return m;
    }

    public static String toJSON(Object o) throws Exception {
        Map<String, Object> map = describe(o);
        StringBuilder sb = new StringBuilder("{");
        boolean useComma = false;
        for (Map.Entry e : map.entrySet()) {
            if (useComma)
                sb.append(",");
            useComma = true;
            String key = (String) e.getKey();
            sb.append(delimiter).append(key).append(delimiter).append(colon);

            Object value = e.getValue();
            if (value == null) {
                sb.append("null");
                continue;
            } else if (e instanceof Collection) {
                sb.append("[");
                for (Object c : (Collection) value) {
                    sb.append(toJSON(c));
                }
                sb.append("]");
            } else if (value instanceof Number || value instanceof Boolean) {
                sb.append(String.valueOf(value));
            } else if (value instanceof String || value instanceof Character) {
                sb.append(delimiter).append(String.valueOf(value)).append(delimiter);
            } else {
                sb.append(toJSON(value));
            }
        }
        sb.append("}");
        return sb.toString();
    }
}