| Line | Hits | Source |
|---|---|---|
| 1 | /* | |
| 2 | Chrysalis Web Framework [http://chrysalis.sourceforge.net] | |
| 3 | Copyright (c) 2002, 2003, 2004, Paul Strack | |
| 4 | ||
| 5 | All rights reserved. | |
| 6 | ||
| 7 | Redistribution and use in source and binary forms, with or without | |
| 8 | modification, are permitted provided that the following conditions are met: | |
| 9 | ||
| 10 | 1. Redistributions of source code must retain the above copyright notice, this | |
| 11 | list of conditions and the following disclaimer. | |
| 12 | ||
| 13 | 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 14 | this list of conditions and the following disclaimer in the documentation | |
| 15 | and/or other materials provided with the distribution. | |
| 16 | ||
| 17 | 3. Neither the name of the copyright holder nor the names of its contributors | |
| 18 | may be used to endorse or promote products derived from this software without | |
| 19 | specific prior written permission. | |
| 20 | ||
| 21 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND | |
| 22 | ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 23 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 24 | DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR | |
| 25 | ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 26 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 27 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
| 28 | ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 29 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 30 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 | */ | |
| 32 | ||
| 33 | package org.chwf.servlet.engine; | |
| 34 | ||
| 35 | import java.io.IOException; | |
| 36 | ||
| 37 | import javax.servlet.FilterChain; | |
| 38 | import javax.servlet.ServletException; | |
| 39 | import javax.servlet.ServletRequest; | |
| 40 | import javax.servlet.ServletResponse; | |
| 41 | ||
| 42 | import org.chwf.servlet.ControllerException; | |
| 43 | import org.chwf.servlet.InvocationContext; | |
| 44 | import org.chwf.servlet.filter.FilterSupport; | |
| 45 | ||
| 46 | /** | |
| 47 | * A filter that invokes a controller, and stores the InvocationContext in | |
| 48 | * the request for post-processing. | |
| 49 | * | |
| 50 | * @author <a href="mailto:pfstrack@users.sourceforge.net">Paul Strack</a> | |
| 51 | */ | |
| 52 | 12 | public class InvokerFilter extends FilterSupport { |
| 53 | ||
| 54 | /** Attribute name for storing the invocation context in the request. */ | |
| 55 | 1 | private static final String INVOCATION_CONTEXT = |
| 56 | InvokerFilter.class.getName() + ".INVOCATION_CONTEXT"; | |
| 57 | ||
| 58 | /** | |
| 59 | * Retrieve the invocation context from the request. This method is only | |
| 60 | * valid after the controller has been invoked. In particular, this method | |
| 61 | * can only be used during post-processing in other filters: | |
| 62 | * | |
| 63 | * <pre> | |
| 64 | * public void doFilter(...) { | |
| 65 | * // Should not call getContext() for pre-processing. | |
| 66 | * chain.doFilter(request, response); | |
| 67 | * // Valid to call getContext() for post-processing. | |
| 68 | * InvocationContext context = InvokerFilter.getContext(request); | |
| 69 | * // Work with context ... | |
| 70 | * }</pre> | |
| 71 | * | |
| 72 | * @param request The request. | |
| 73 | * @return The context, or <code>null</code> if it has not been initialized. | |
| 74 | */ | |
| 75 | public static InvocationContext getContext(ServletRequest request) { | |
| 76 | 6 | return (InvocationContext) request.getAttribute(INVOCATION_CONTEXT); |
| 77 | } | |
| 78 | ||
| 79 | /** | |
| 80 | * Cache the invocation context in the request. | |
| 81 | * | |
| 82 | * @param context The context. | |
| 83 | * @param request The request. | |
| 84 | */ | |
| 85 | private static void cacheContext( | |
| 86 | InvocationContext context, | |
| 87 | ServletRequest request) { | |
| 88 | 6 | request.setAttribute(INVOCATION_CONTEXT, context); |
| 89 | 6 | } |
| 90 | ||
| 91 | /** | |
| 92 | * Process filter. | |
| 93 | * | |
| 94 | * @param request The request. | |
| 95 | * @param response The response. | |
| 96 | * @param chain The filter chain. | |
| 97 | * @throws ServletException For servlet exceptions. | |
| 98 | * @throws IOException For IO exceptions. | |
| 99 | */ | |
| 100 | public void doFilter( | |
| 101 | ServletRequest request, | |
| 102 | ServletResponse response, | |
| 103 | FilterChain chain) | |
| 104 | throws IOException, ServletException { | |
| 105 | ||
| 106 | try { | |
| 107 | 7 | cacheContext(ControllerMapper.invoke(request), request); |
| 108 | 6 | } catch (ControllerException ex) { |
| 109 | 1 | throw new ServletException(ex); |
| 110 | } | |
| 111 | 6 | } |
| 112 | } |
|
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