001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.services.impl;
016    
017    import org.apache.tapestry.services.AbsoluteURLBuilder;
018    import org.apache.tapestry.web.WebRequest;
019    
020    /**
021     * @author Howard M. Lewis Ship
022     * @since 4.0
023     */
024    public class AbsoluteURLBuilderImpl implements AbsoluteURLBuilder
025    {
026        private WebRequest _request;
027    
028        public String constructURL(String URI, String scheme, String server, int port)
029        {
030            // Though, really, what does a leading colon with no scheme before it
031            // mean?
032    
033            if (URI.indexOf(':') >= 0)
034                return URI;
035    
036            StringBuffer buffer = new StringBuffer();
037    
038            // Should check the length here, first.
039    
040            if (URI.length()> 2 && URI.substring(0, 2).equals("//"))
041            {
042                buffer.append(scheme);
043                buffer.append(':');
044                buffer.append(URI);
045                return buffer.toString();
046            }
047    
048            buffer.append(scheme);
049            buffer.append("://");
050            buffer.append(server);
051    
052            if (port > 0)
053            {
054                buffer.append(':');
055                buffer.append(port);
056            }
057    
058            if (URI.charAt(0) != '/')
059                buffer.append('/');
060    
061            buffer.append(URI);
062    
063            return buffer.toString();
064        }
065    
066        public String constructURL(String URI)
067        {
068            String scheme = _request.getScheme();
069            String server = _request.getServerName();
070            int port = _request.getServerPort();
071    
072            // Keep things simple ... port 80 is accepted as the
073            // standard port for http so it can be ommitted.
074            //
075            // Some of the Tomcat code indicates that port 443 is the default
076            // for https.. And it is. 
077    
078            if ((scheme.equals("http") && port == 80) || (scheme.equals("https") && port == 443))
079                port = 0;
080    
081            return constructURL(URI, scheme, server, port);
082        }
083    
084        public void setRequest(WebRequest request)
085        {
086            _request = request;
087        }
088    }