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package com.couchbase.lite.util;

import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * Created by hideki on 7/23/15.
 */
public class JSONUtils {

    private static long kObjectOverhead = 20;

    public static long estimate(Object obj) {
        if (obj == null) return 0;

        // String
        if (obj instanceof String) {
            return kObjectOverhead + 2 * ((String) obj).length();
        }
        // Number is abstract class of all number types such as Long, Float, ...
        else if (obj instanceof Number) {
            return kObjectOverhead + 8;
        }
        // Map (Dictionary)
        else if (obj instanceof Map) {
            long size = kObjectOverhead;
            Map map = (Map) obj;
            Iterator itr = map.keySet().iterator();
            while (itr.hasNext()) {
                Object key = itr.next();
                size += estimate(key) + estimate(map.get(key));
            }
            return size;
        }
        // List (Array)
        else if (obj instanceof List) {
            long size = kObjectOverhead;
            for (Object item : (List) obj) {
                size += estimate(item);
            }
            return size;
        } else {
            return 0;
        }
    }
}