UrlEncode.java

package me.berkow.playground;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Formatter;
import java.util.Iterator;
import java.util.Map;


private static String encodedUrl(String baseUrl,
                                 String path, Object[] pathParams,
                                 Map<String, Object> query) throws UnsupportedEncodingException {
    StringBuilder builder = new StringBuilder(baseUrl);
    Formatter formatter = new Formatter(builder);
    formatter.format(path, pathParams);

    Iterator<Map.Entry<String, Object>> iterator = query.entrySet().iterator();

    if (!iterator.hasNext()) {
        return builder.toString();
    }

    final String utf8 = StandardCharsets.UTF_8.name();

    Map.Entry<String, Object> entry = iterator.next();
    String key = entry.getKey();
    Object value = entry.getValue();
    String encodedValue = value == null ? null : URLEncoder.encode(value.toString(), utf8);
    if (encodedValue != null) {
        formatter.format("?%s=%s", key, encodedValue);
    } else {
        formatter.format("?%s", key);
    }

    while (iterator.hasNext()) {
        entry = iterator.next();
        key = entry.getKey();
        value = entry.getValue();
        encodedValue = value == null ? null : URLEncoder.encode(value.toString(), utf8);
        if (encodedValue != null) {
            formatter.format("&%s=%s", key, encodedValue);
        } else {
            formatter.format("&%s", key);
        }
    }

    return builder.toString();
}