URL.java

/*
 **
	Copyright 2010 Udaya Kumar (Udy)

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
 **	
 */
package models.org.onesun.utils.encoders;

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

public class URL {

	private static final String UTF8 = "UTF-8";
	private static final String URL_SPACE_ENCODING = "+";
	private static final String SPACE_ENCODING = "%20";

	public static String percentEncode(String string) {
		try {
			return URLEncoder.encode(string, UTF8).replace(URL_SPACE_ENCODING,
					SPACE_ENCODING);
		} catch (UnsupportedEncodingException uee) {
			throw new RuntimeException("Unsupported encoding: " + UTF8);
		}
	}

	public static String decode(String string) {
		try {
			return URLDecoder.decode(string, UTF8);
		} catch (UnsupportedEncodingException uee) {
			throw new RuntimeException("Unsupported encoding: " + UTF8);
		}
	}

	public static String queryString(Map<String, String> params) {
		return (params.size() <= 0) ? "" : "?" + getFormEncodedString(params);
	}

	private static String getFormEncodedString(Map<String, String> params) {
		StringBuffer buffer = new StringBuffer();
		for (Map.Entry<String, String> entry : params.entrySet()) {
			buffer.append(percentEncode(entry.getKey())).append('=').append(
					percentEncode(entry.getValue())).append('&');
		}
		String query = buffer.toString();
		return query.substring(0, query.length() - 1);
	}
}