Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/* Copyright 2014 MITRE Corporation
 *
 * Licensed 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.
 */

import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;

public class Main {
    /**
     * Given an un-encoded URI query string, this will return a normalized, properly encoded URI query string.
     * <b>Important:</b> This method uses java's URLEncoder, which returns things that are 
     * application/x-www-form-urlencoded, instead of things that are properly octet-esacped as the URI spec
     * requires.  As a result, some substitutions are made to properly translate space characters to meet the
     * URI spec.
     * @param queryString
     * @return
     */
    private static String normalizeQueryString(String queryString) throws UnsupportedEncodingException {
        if ("".equals(queryString) || queryString == null)
            return queryString;

        String[] pieces = queryString.split("&");
        HashMap<String, String> kvp = new HashMap<String, String>();
        StringBuffer builder = new StringBuffer("");

        for (int x = 0; x < pieces.length; x++) {
            String[] bs = pieces[x].split("=", 2);
            bs[0] = URLEncoder.encode(bs[0], "UTF-8");
            if (bs.length == 1)
                kvp.put(bs[0], null);
            else {
                kvp.put(bs[0], URLEncoder.encode(bs[1], "UTF-8").replaceAll("\\+", "%20"));
            }
        }

        // Sort the keys alphabetically, ignoring case.
        ArrayList<String> keys = new ArrayList<String>(kvp.keySet());
        Collections.sort(keys, new Comparator<String>() {
            public int compare(String o1, String o2) {
                return o1.compareToIgnoreCase(o2);
            }
        });

        // With the alphabetic list of parameter names, re-build the query string.
        for (int x = 0; x < keys.size(); x++) {
            // Some parameters have no value, and are simply present.  If so, we put null in kvp,
            // and we just put the parameter name, no "=value".
            if (kvp.get(keys.get(x)) == null)
                builder.append(keys.get(x));
            else
                builder.append(keys.get(x) + "=" + kvp.get(keys.get(x)));

            if (x < (keys.size() - 1))
                builder.append("&");
        }

        return builder.toString();
    }
}