package com.metaweb.gridworks.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;

import org.apache.commons.codec.net.URLCodec;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

public class ParsingUtilities {
	static public String inputStreamToString(InputStream is) throws IOException {
		Reader reader = new InputStreamReader(is, "UTF-8");
		try {
			return readerToString(reader);
		} finally {
			reader.close();
		}
	}

	static public String readerToString(Reader reader) throws IOException {
		StringBuffer sb = new StringBuffer();
		
		char[] chars = new char[8192];
		int c;
		
		while ((c = reader.read(chars)) > 0) {
			sb.insert(sb.length(), chars, 0, c);
		}
		
		return sb.toString();
	}

    static public JSONObject evaluateJsonStringToObject(String s) throws JSONException {
    	JSONTokener t = new JSONTokener(s);
    	JSONObject o = (JSONObject) t.nextValue();
    	return o;
    }
    
    static public JSONArray evaluateJsonStringToArray(String s) throws JSONException {
    	JSONTokener t = new JSONTokener(s);
    	JSONArray a = (JSONArray) t.nextValue();
    	return a;
    }
    
    private static final URLCodec codec = new URLCodec();
    static public String encode(String s) {
        try {
			return codec.encode(s, "UTF-8");
		} catch (UnsupportedEncodingException e) {
			return s; // should not happen
		}
    }

}