com.hmsinc.epicenter.webapp.util.URLUtils.java Source code

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Here is the source code for com.hmsinc.epicenter.webapp.util.URLUtils.java

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/**
 * Copyright (C) 2008 University of Pittsburgh
 * 
 * 
 * This file is part of Open EpiCenter
 * 
 *     Open EpiCenter is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * 
 *     Open EpiCenter is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License
 *     along with Open EpiCenter.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * 
 *   
 */
package com.hmsinc.epicenter.webapp.util;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.net.URLCodec;

/**
 * @author shade
 * @version $Id: URLUtils.java 1803 2008-07-02 19:12:42Z steve.kondik $
 */
public final class URLUtils {

    private static final URLCodec codec = new URLCodec();

    /**
     * @param queryString
     * @return
     */
    public static Map<String, String> queryStringToMap(final String queryString) {

        final Map<String, String> map = new HashMap<String, String>();
        try {

            if (queryString != null) {
                for (String pair : codec.decode(queryString).split("&")) {

                    final String[] kv = pair.split("=");
                    if (kv.length == 2) {
                        map.put(codec.decode(kv[0]), codec.decode(kv[1]));

                    }
                }
            }

        } catch (DecoderException e) {
            throw new IllegalArgumentException(e);
        }

        return map;
    }

    /**
     * @param map
     * @return
     */
    public static String mapToQueryString(final Map<String, ? extends Object> map) {

        final StringBuilder sb = new StringBuilder();
        if (map != null) {
            for (Map.Entry<String, ? extends Object> entry : map.entrySet()) {

                if (sb.length() > 0) {
                    sb.append("&");
                }
                try {
                    sb.append(codec.encode(entry.getKey())).append("=")
                            .append(codec.encode(entry.getValue().toString()));
                } catch (EncoderException e) {
                    throw new IllegalArgumentException(e);
                }
            }
        }

        return sb.toString();
    }
}