// Copyright (c) 2006-2007, Mihai Preda.
// Available under the MIT License (see COPYING).

import java.util.*;
import java.io.*;

class Config {
    Hashtable ht = new Hashtable();
    Store rs;
    int recId;

    Config(Store rs, int recId) {
        this.rs = rs;
        this.recId = recId;
        DataInputStream is = rs.readIS(recId);
        if (is != null) {
            String s1, s2;
            int sz = 0;
            try {
                sz = is.readInt();
                for (int i = 0; i < sz; ++i) {
                    s1 = is.readUTF();
                    s2 = is.readUTF();
                    ht.put(s1, s2);
                    Log.log("--- " + s1 + " " + s2 + " ---");
                }
            } catch (IOException e) {
                if (sz != ht.size()) {
                    throw new Error("config read " + e);
                }
            }
        }
    }

    void set(String key, String value) {
        ht.put(key, value);
    }
    
    String get(String key, String def) {
        Object o = ht.get(key);
        return (o == null) ? def : (String)o; 
    }

    int size() {
        return ht.size();
    }

    DataOut out = new DataOut();
    void save() {
        int sz = ht.size();
        Enumeration keys = ht.keys();        
        String s1, s2;
        try {
            out.writeInt(sz);
            for (int i = 0; i < sz; ++i) {
                s1 = (String) keys.nextElement();
                s2 = get(s1, null);
                out.writeUTF(s1);
                out.writeUTF(s2);
            }
        } catch (IOException e) {
            throw new Error("config save " + e);
        }
        rs.write(recId, out.getBytesAndReset());
        Log.log("config saved");
    }
}