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1 package org.sapia.soto.state.cocoon.view;
2
3 import org.apache.commons.jelly.Jelly;
4 import org.apache.commons.jelly.JellyContext;
5 import org.apache.commons.jelly.Script;
6 import org.apache.commons.jelly.XMLOutput;
7 import org.apache.commons.lang.ClassUtils;
8
9 import org.sapia.soto.state.Result;
10 import org.sapia.soto.state.StateRuntimeException;
11 import org.sapia.soto.state.Step;
12 import org.sapia.soto.state.cocoon.CocoonContext;
13 import org.sapia.soto.state.xml.StyleStep;
14 import org.sapia.soto.state.xml.TransformState;
15 import org.sapia.soto.state.xml.XMLContext;
16 import org.sapia.soto.util.Param;
17 import org.sapia.soto.util.Resource;
18 import org.sapia.soto.util.ResourceHandler;
19 import org.sapia.soto.util.Utils;
20
21 import org.sapia.util.xml.confix.ConfigurationException;
22
23 import org.xml.sax.ContentHandler  ;
24
25 import java.io.IOException ;
26
27 import java.net.URL ;
28
29 import java.util.ArrayList ;
30 import java.util.List ;
31 import java.util.Map ;
32
33 import javax.xml.transform.TransformerConfigurationException ;
34
35
69 public class JellyView extends TransformState implements Step {
70 private Script _jelly;
71 private String _uri;
72 private String _id;
73 private Resource _res;
74 private long _lastModified;
75 private List _params = new ArrayList ();
76
77
80 public String getName() {
81 return ClassUtils.getShortClassName(getClass());
82 }
83
84
89 public void setSrc(String uri) throws IOException , Exception {
90 _uri = uri;
91
92 ResourceHandler handler = (ResourceHandler) env().getResourceHandlerFor(Utils.chopScheme(
93 uri));
94 _res = handler.getResourceObject(uri);
95
96 Jelly j = new Jelly();
97 _lastModified = _res.lastModified();
98 j.setUrl(new URL (_res.getURI()));
99 _jelly = j.compileScript();
100 }
101
102
108 public Param createParam(){
109 Param p = new Param();
110 _params.add(p);
111 return p;
112 }
113
114
115
118 protected void process(Result res, ContentHandler handler) {
119 XMLContext ctx = (XMLContext) res.getContext();
120
121 Object model = null;
122
123 if (ctx.hasCurrentObject()) {
124 model = ctx.currentObject();
125 }
126
127 try {
128 execute(model, ctx.getViewParams(), handler);
129 } catch (Throwable t) {
130 throw new StateRuntimeException("Could not run Jelly state: " + getId() +
131 " for script: " + _uri, t);
132 }
133 }
134
135 protected void execute(Object model, Map viewParams, ContentHandler handler)
136 throws Throwable {
137 if (_jelly == null) {
138 throw new IllegalStateException ("Jelly script not set on Jelly view");
139 }
140
141 if (_lastModified != _res.lastModified()) {
142 reload();
143 }
144
145 JellyContext jelly = new JellyContext();
146 JellyUtils.copyParamsTo(jelly, viewParams);
147
148 jelly.setVariable(CocoonContext.MODEL_KEY, model);
149
150 Param p;
151 for(int i = 0; i < _params.size(); i++){
152 p = (Param)_params.get(i);
153 if(p.getName() != null && p.getValue() != null){
154 jelly.setVariable(p.getName(), p.getValue());
155 }
156 }
157
158 XMLOutput output = new XMLOutput(handler);
159 output.startDocument();
160 _jelly.run(jelly, output);
161 output.endDocument();
162 }
163
164
167 public void handleObject(String name, Object obj)
168 throws ConfigurationException {
169 if (obj instanceof XslSource) {
170 try{
171 XslSource xsl = (XslSource)obj;
172 StyleStep step = new StyleStep();
173 step.setEnv(env());
174 step.setSrc(xsl.getUri());
175 }catch(TransformerConfigurationException e){
176 throw new ConfigurationException("Could not instantiate StyleStep", e);
177 }catch(IOException e){
178 throw new ConfigurationException("Could not inialize stylesheet", e);
179 }
180 }
181 else{
182 super.handleObject(name, obj);
183 }
184 }
185
186 private synchronized void reload() throws Exception {
187 if (_res.lastModified() != _lastModified) {
188 Jelly j = new Jelly();
189 j.setUrl(new URL (_res.getURI()));
190 _jelly = j.compileScript();
191 }
192
193 _lastModified = _res.lastModified();
194 }
195 }
196 |
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