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1
5 package com.opensymphony.webwork.views.xslt;
6
7 import com.opensymphony.webwork.ServletActionContext;
8 import com.opensymphony.webwork.config.Configuration;
9 import com.opensymphony.xwork.ActionContext;
10 import com.opensymphony.xwork.ActionInvocation;
11 import com.opensymphony.xwork.Result;
12 import com.opensymphony.xwork.util.OgnlValueStack;
13 import com.opensymphony.xwork.util.TextParseUtil;
14 import org.apache.commons.logging.Log;
15 import org.apache.commons.logging.LogFactory;
16
17 import javax.servlet.http.HttpServletResponse  ;
18 import javax.xml.transform.*;
19 import javax.xml.transform.dom.DOMSource ;
20 import javax.xml.transform.stream.StreamResult ;
21 import javax.xml.transform.stream.StreamSource ;
22 import java.io.IOException ;
23 import java.io.PrintWriter ;
24 import java.io.Writer ;
25 import java.net.URL ;
26 import java.util.HashMap ;
27 import java.util.Map ;
28
29
30
33 public class XSLTResult implements Result {
34
36 private static final Log log = LogFactory.getLog(XSLTResult.class);
37 public static final String DEFAULT_PARAM = "location";
38
39
41 protected boolean noCache = false;
42 private Map templatesCache;
43 private String location;
44 private boolean parse;
45
46
48 public XSLTResult() {
49 templatesCache = new HashMap ();
50 noCache = Configuration.getString("webwork.xslt.nocache").trim().equalsIgnoreCase("true");
51 }
52
53
55 public void setLocation(String location) {
56 this.location = location;
57 }
58
59 public void setParse(boolean parse) {
60 this.parse = parse;
61 }
62
63 public void execute(ActionInvocation invocation) throws Exception {
64 long startTime = System.currentTimeMillis();
65
66 if (parse) {
67 OgnlValueStack stack = ActionContext.getContext().getValueStack();
68 location = TextParseUtil.translateVariables(location, stack);
69 }
70
71 try {
72 HttpServletResponse response = ServletActionContext.getResponse();
73
74 Writer writer = response.getWriter();
75
76 Templates templates = getTemplates(location);
78 Transformer transformer = templates.newTransformer();
79
80 String mimeType = templates.getOutputProperties().getProperty(OutputKeys.MEDIA_TYPE);
81
82 if (mimeType == null) {
83 mimeType = "text/html";
85 }
86
87 response.setContentType(mimeType);
88
89 Source xmlSource = getTraxSourceForStack(invocation.getAction());
90
91 PrintWriter out = response.getWriter();
93
94 transformer.transform(xmlSource, new StreamResult (out));
95
96 out.close();
98 if (log.isDebugEnabled()) {
99 log.debug("Time:" + (System.currentTimeMillis() - startTime) + "ms");
100 }
101
102 writer.flush();
103 } catch (Exception e) {
104 log.error("Unable to render XSLT Template, '" + location + "'", e);
105 throw e;
106 }
107 }
108
109 private Templates getTemplates(String path) throws TransformerException, IOException {
110 String pathFromRequest = ServletActionContext.getRequest().getParameter("xslt.location");
111
112 if (pathFromRequest != null) {
113 path = pathFromRequest;
114 }
115
116 if (path == null) {
117 throw new TransformerException("Stylesheet path is null");
118 }
119
120 Templates templates = (Templates) templatesCache.get(path);
121
122 if (noCache || (templates == null)) {
123 synchronized (templatesCache) {
124 URL resource = ServletActionContext.getServletContext().getResource(path);
125
126 if (resource == null) {
127 throw new TransformerException("Stylesheet " + path + " not found in resources.");
128 }
129
130 if (
131 log.isDebugEnabled()) {
134 log.debug("Preparing new XSLT stylesheet: " + path);
137 }
138
139 TransformerFactory factory = TransformerFactory.newInstance();
140 log.trace("Uri-Resolver is: " + factory.getURIResolver());
141 factory.setURIResolver(new ServletURIResolver(ServletActionContext.getServletContext()));
142 log.trace("Uri-Resolver is: " + factory.getURIResolver());
143 templates = factory.newTemplates(new StreamSource (resource.openStream()));
144 templatesCache.put(path, templates);
145 }
146 }
147
148 return templates;
149 }
150
151 private Source getTraxSourceForStack(Object action) throws IllegalAccessException , InstantiationException {
152 return new DOMSource (new DOMAdapter().adapt(action));
153 }
154 }
155 |
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