001// Copyright 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
015package org.apache.tapestry.engine.encoders;
016
017import org.apache.tapestry.engine.ServiceEncoder;
018import org.apache.tapestry.engine.ServiceEncoding;
019import org.apache.tapestry.services.ServiceConstants;
020
021/**
022 * Encodes the service name, typical output is "/page.svc" where "page" is a service name. This is
023 * useful for the home and restart services, for example. This encoder should be prioritized very
024 * low so that it doesn't prevent other encoders from doing their work.
025 * 
026 * @author Howard M. Lewis Ship
027 * @since 4.0
028 */
029public class ServiceExtensionEncoder implements ServiceEncoder
030{
031    private String _extension;
032
033    public void setExtension(String extension)
034    {
035        _extension = extension;
036    }
037
038    public void encode(ServiceEncoding encoding)
039    {
040        String service = encoding.getParameterValue(ServiceConstants.SERVICE);
041
042        // Can assume this is never null.
043
044        encoding.setServletPath("/" + service + "." + _extension);
045        encoding.setParameterValue(ServiceConstants.SERVICE, null);
046    }
047
048    public void decode(ServiceEncoding encoding)
049    {
050        String servletPath = encoding.getServletPath();
051
052        int dotx = servletPath.lastIndexOf('.');
053
054        String extension = servletPath.substring(dotx + 1);
055
056        if (!extension.equals(_extension))
057            return;
058
059        // The first character should be a slash, then the service name, then the dot.
060
061        String service = servletPath.substring(1, dotx);
062
063        encoding.setParameterValue(ServiceConstants.SERVICE, service);
064    }
065
066}