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/**
 * Legato is a configurable, lightweight web mapping client that can be
 * easily embedded into web pages and portals, CMS and individual web
 * applications. Legato is implemented in JavaScript and based on the
 * popular open source library OpenLayers.
 *
 * Copyright (C) 2010  disy Informationssysteme GmbH, http://www.disy.net
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see .
 */

package net.disy.commons.servlet.util;

import javax.servlet.http.HttpServletRequest;

public class ServletUrlProvider implements UrlProvider {

  private final HttpServletRequest request;

  public ServletUrlProvider(HttpServletRequest request) {
    this.request = request;
  }

  @Override
  public String getUrl(String queryString) {
    return createAbsoluteContextUrl(
        request.getScheme(),
        request.getServerName(),
        request.getServerPort(),
        request.getContextPath() + queryString);
  }

  private String createAbsoluteContextUrl(String protocol, String host, int port, String context) {
    StringBuffer sb = new StringBuffer();
    sb.append(protocol).append("://").append(host);

    if ((protocol.equals("http") && (port != 80)) || (protocol.equals("https") && (port != 443))) {
      sb.append(":").append(port);
    }

    sb.append(context);

    return sb.toString();
  }

}