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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and asynchronously process the HTTP responses.
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/*
 * Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package com.ning.http.util;

import static com.ning.http.util.MiscUtils.isNonEmpty;
import static com.ning.http.util.UTF8UrlEncoder.encodeAndAppendQuery;

import com.ning.http.client.Param;
import com.ning.http.client.uri.Uri;

import java.util.List;

public enum UriEncoder {

    FIXING {

        public String encodePath(String path) {
            return UTF8UrlEncoder.encodePath(path);
        }

        private void encodeAndAppendQueryParam(final StringBuilder sb, final CharSequence name, final CharSequence value) {
            UTF8UrlEncoder.encodeAndAppendQueryElement(sb, name);
            if (value != null) {
                sb.append('=');
                UTF8UrlEncoder.encodeAndAppendQueryElement(sb, value);
            }
            sb.append('&');
        }

        private void encodeAndAppendQueryParams(final StringBuilder sb, final List queryParams) {
            for (Param param : queryParams)
                encodeAndAppendQueryParam(sb, param.getName(), param.getValue());
        }

        protected String withQueryWithParams(final String query, final List queryParams) {
            // concatenate encoded query + encoded query params
            StringBuilder sb = StringUtils.stringBuilder();
            encodeAndAppendQuery(sb, query);
            sb.append('&');
            encodeAndAppendQueryParams(sb, queryParams);
            sb.setLength(sb.length() - 1);
            return sb.toString();
        }

        protected String withQueryWithoutParams(final String query) {
            // encode query
            StringBuilder sb = StringUtils.stringBuilder();
            encodeAndAppendQuery(sb, query);
            return sb.toString();
        }

        protected String withoutQueryWithParams(final List queryParams) {
            // concatenate encoded query params
            StringBuilder sb = StringUtils.stringBuilder();
            encodeAndAppendQueryParams(sb, queryParams);
            sb.setLength(sb.length() - 1);
            return sb.toString();
        }
    }, //

    RAW {

        public String encodePath(String path) {
            return path;
        }

        private void appendRawQueryParam(StringBuilder sb, String name, String value) {
            sb.append(name);
            if (value != null)
                sb.append('=').append(value);
            sb.append('&');
        }

        private void appendRawQueryParams(final StringBuilder sb, final List queryParams) {
            for (Param param : queryParams)
                appendRawQueryParam(sb, param.getName(), param.getValue());
        }

        protected String withQueryWithParams(final String query, final List queryParams) {
            // concatenate raw query + raw query params
            StringBuilder sb = StringUtils.stringBuilder();
            sb.append(query);
            appendRawQueryParams(sb, queryParams);
            sb.setLength(sb.length() - 1);
            return sb.toString();
        }

        protected String withQueryWithoutParams(final String query) {
            // return raw query as is
            return query;
        }

        protected String withoutQueryWithParams(final List queryParams) {
            // concatenate raw queryParams
            StringBuilder sb = StringUtils.stringBuilder();
            appendRawQueryParams(sb, queryParams);
            sb.setLength(sb.length() - 1);
            return sb.toString();
        }
    };

    public static UriEncoder uriEncoder(boolean disableUrlEncoding) {
        return disableUrlEncoding ? RAW : FIXING;
    }

    protected abstract String withQueryWithParams(final String query, final List queryParams);

    protected abstract String withQueryWithoutParams(final String query);

    protected abstract String withoutQueryWithParams(final List queryParams);

    private final String withQuery(final String query, final List queryParams) {
        return isNonEmpty(queryParams) ? withQueryWithParams(query, queryParams) : withQueryWithoutParams(query);
    }

    private final String withoutQuery(final List queryParams) {
        return isNonEmpty(queryParams) ? withoutQueryWithParams(queryParams) : null;
    }

    public Uri encode(Uri uri, List queryParams) {
        String newPath = encodePath(uri.getPath());
        String newQuery = encodeQuery(uri.getQuery(), queryParams);
        return new Uri(uri.getScheme(),//
                uri.getUserInfo(),//
                uri.getHost(),//
                uri.getPort(),//
                newPath,//
                newQuery);
    }

    protected abstract String encodePath(String path);

    private final String encodeQuery(final String query, final List queryParams) {
        return isNonEmpty(query) ? withQuery(query, queryParams) : withoutQuery(queryParams);
    }
}