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Simplified, lightweight HTTP client library.
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/**
 * The MIT License
 *
 * Copyright for portions of OpenUnirest/uniresr-java are held by Kong Inc (c) 2013 as part of Kong/unirest-java.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package unirest;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.*;
import java.util.stream.Stream;

class Util {

    //In Java 9 this has been added as Optional::stream. Remove this whenever we get there.
    static  Stream stream(Optional opt) {
        return opt.map(Stream::of).orElseGet(Stream::empty);
    }

    static  Optional tryCast(T original, Class too) {
        if (original != null && too.isAssignableFrom(original.getClass())) {
            return Optional.of((M) original);
        }
        return Optional.empty();
    }

    static  Optional tryDo(T c, ExConsumer consumer) {
        try {
            if (Objects.nonNull(c)) {
                consumer.accept(c);
            }
            return Optional.empty();
        } catch (Exception e) {
            return Optional.of(e);
        }
    }

    static String nullToEmpty(Object v) {
        if(v == null){
            return "";
        }
        return String.valueOf(v);
    }

    static String encode(String input) {
        try {
            return URLEncoder.encode(input, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new UnirestException(e);
        }
    }

    static List getList(Collection parameters) {
        List result = new ArrayList<>();
        for (FormPart entry : parameters) {
            result.add(new BasicNameValuePair(entry.getName(), entry.getValue().toString()));
        }
        return result;
    }

    static Stream collectExceptions(Optional... ex) {
        return Stream.of(ex).flatMap(Util::stream);
    }

    public static InputStream emptyStream() {
        return new ByteArrayInputStream(new byte[0]);
    }

    public static boolean isNullOrEmpty(String s) {
        return s == null || s.trim().isEmpty();
    }


    @FunctionalInterface
    public interface ExConsumer{
        void accept(T t) throws Exception;
    }
}