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This Java library contains classes that allows you to do payments using Yandex.Money public API.

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package com.yandex.money.api.utils;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * Helps to deal with urls.
 *
 * @author Slava Yasevich ([email protected])
 */
public class UrlEncodedUtils {

    /**
     * Parses url to key-value pairs of its parameters.
     *
     * @param url url
     * @return key-value pairs
     */
    public static Map parse(String url) throws URISyntaxException {
        if (Strings.isNullOrEmpty(url)) {
            throw new IllegalArgumentException("redirectUrl is null or empty");
        }

        URI uri = new URI(url);
        String query = uri.getQuery();
        if (query == null) {
            return Collections.unmodifiableMap(new HashMap());
        }

        Map map = new HashMap<>();
        String[] params = query.split("&");
        for (String param : params) {
            String[] keyValue = param.split("=");
            if (keyValue.length == 2) {
                map.put(keyValue[0], keyValue[1]);
            }
        }
        return Collections.unmodifiableMap(map);
    }
}