JSONNormalizer.java

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package com.sun.jersey.json.impl.util;

import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
import org.codehaus.jettison.json.JSONArray;
import org.codehaus.jettison.json.JSONObject;

/**
 *
 * @author japod
 */
public class JSONNormalizer {

    public static String normalizeJsonString(String s) throws Exception {
        if (s == null) {
            return null;
        }

        s = s.trim();

        if (s.startsWith("{")) {
            return normalizeJsonObjectString(s);
        } else if (s.startsWith("[")) {
            return normalizeJsonArrayString(s);
        } else {
            return JSONObject.quote(s);
        }
    }

    private static String normalizeJsonObjectString(String s) throws Exception {

        JSONObject o = new JSONObject(s);
        StringBuilder result = new StringBuilder();

        result.append('{');
        boolean firstOne = true;

        for (String k : sortedKeySet(o)) {
            if (!firstOne) {
                result.append(',');
            } else {
                firstOne = false;
            }
            result.append('"').append(JSONObject.quote(k)).append('"').append(':');
            result.append(normalizeJsonString(o.getString(k)));
        }

        return result.append('}').toString();
    }

    private static Set<String> sortedKeySet(JSONObject o) {
        Iterator i = o.keys();
        Set<String> keys = new TreeSet<String>();
        while (i.hasNext()) {
            String k = (String) i.next();
            keys.add(k);
        }
        return keys;
    }

    private static String normalizeJsonArrayString(String s) throws Exception {

        JSONArray a = new JSONArray(s);

        StringBuilder result = new StringBuilder();
        result.append('[');

        for (int i = 0; i < a.length(); i++) {
            if (i > 0) {
                result.append(',');
            }
            result.append(normalizeJsonString(a.getString(i)));
        }

        return result.append(']').toString();
    }
}