storm-webapp/src/main/java/org/apache/storm/daemon/utils/UrlBuilder.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.storm.daemon.utils;

import static java.util.stream.Collectors.joining;

import java.util.Map;
import org.apache.storm.utils.Utils;

/**
 * Convenient utility class to build the URL.
 */
public class UrlBuilder {

    private UrlBuilder() {
    }

    /**
     * Build the URL. the key and value of query parameters will be encoded.
     *
     * @param urlPath URL except query parameter
     * @param parameters query parameter
     * @return the url concatenating url path and query parameters
     */
    public static String build(String urlPath, Map<String, Object> parameters) {
        StringBuilder sb = new StringBuilder();
        sb.append(urlPath);
        if (parameters.size() > 0) {
            sb.append("?");

            String queryParam = parameters.entrySet().stream()
                .map(entry -> {
                    return Utils.urlEncodeUtf8(entry.getKey())
                        + "="
                        + Utils.urlEncodeUtf8(entry.getValue().toString());
                })
                .collect(joining("&"));
            sb.append(queryParam);
        }
        return sb.toString();
    }
}