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package org.apache.tapestry.contrib.ajax; |
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import java.io.IOException; |
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import java.io.OutputStream; |
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import java.io.StringWriter; |
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import java.util.HashMap; |
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import java.util.Map; |
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|
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import javax.xml.parsers.DocumentBuilder; |
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import javax.xml.parsers.DocumentBuilderFactory; |
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import javax.xml.transform.OutputKeys; |
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import javax.xml.transform.Transformer; |
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import javax.xml.transform.TransformerFactory; |
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import javax.xml.transform.dom.DOMSource; |
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import javax.xml.transform.stream.StreamResult; |
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|
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import org.apache.hivemind.ApplicationRuntimeException; |
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import org.apache.hivemind.util.Defense; |
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import org.apache.tapestry.IComponent; |
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import org.apache.tapestry.IPage; |
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import org.apache.tapestry.IRequestCycle; |
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import org.apache.tapestry.engine.IEngineService; |
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import org.apache.tapestry.engine.ILink; |
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import org.apache.tapestry.error.RequestExceptionReporter; |
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import org.apache.tapestry.services.LinkFactory; |
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import org.apache.tapestry.services.ServiceConstants; |
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import org.apache.tapestry.util.ContentType; |
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import org.apache.tapestry.web.WebResponse; |
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import org.w3c.dom.Document; |
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import org.w3c.dom.Node; |
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|
51 | 0 | public class XTileService implements IEngineService |
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{ |
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public static final String SERVICE_NAME = "xtile"; |
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private RequestExceptionReporter _exceptionReporter; |
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private WebResponse _response; |
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private LinkFactory _linkFactory; |
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public String getName() |
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{ |
63 | 0 | return SERVICE_NAME; |
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} |
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public ILink getLink(boolean post, Object parameter) |
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{ |
68 | 0 | Defense.isAssignable(parameter, IComponent.class, "parameter"); |
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|
70 | 0 | IComponent component = (IComponent) parameter; |
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|
72 | 0 | Map parameters = new HashMap(); |
73 | 0 | parameters.put(ServiceConstants.PAGE, component.getPage().getPageName()); |
74 | 0 | parameters.put(ServiceConstants.COMPONENT, component.getIdPath()); |
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|
76 | 0 | return _linkFactory.constructLink(this, false, parameters, true); |
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} |
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|
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public void service(IRequestCycle cycle) throws IOException |
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{ |
81 | 0 | String pageName = cycle.getParameter(ServiceConstants.PAGE); |
82 | 0 | String componentId = cycle.getParameter(ServiceConstants.COMPONENT); |
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|
84 | 0 | IPage componentPage = cycle.getPage(pageName); |
85 | 0 | IComponent component = componentPage.getNestedComponent(componentId); |
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|
87 | 0 | if (!(component instanceof IXTile)) |
88 | 0 | throw new ApplicationRuntimeException("Incorrect component type: was " |
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+ component.getClass() + " but must be " + IXTile.class, component, null, null); |
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|
91 | 0 | IXTile xtile = (IXTile) component; |
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|
93 | 0 | String[] params = cycle.getParameters(ServiceConstants.PARAMETER); |
94 | 0 | cycle.setListenerParameters(params); |
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|
96 | 0 | xtile.trigger(cycle); |
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|
99 | 0 | Object[] args = cycle.getListenerParameters(); |
100 | 0 | String strArgs = generateOutputString(args); |
101 | 0 | if (strArgs != null) |
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{ |
103 | 0 | OutputStream output = _response.getOutputStream(new ContentType("text/xml")); |
104 | 0 | output.write(strArgs.getBytes("utf-8")); |
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} |
106 | 0 | } |
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|
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protected String generateOutputString(Object[] args) |
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{ |
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try |
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{ |
112 | 0 | DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
113 | 0 | dbf.setValidating(false); |
114 | 0 | DocumentBuilder db = dbf.newDocumentBuilder(); |
115 | 0 | Document doc = db.newDocument(); |
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|
117 | 0 | Node rootNode = doc.createElement("data"); |
118 | 0 | doc.appendChild(rootNode); |
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|
120 | 0 | if (args != null) |
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{ |
122 | 0 | for (int i = 0; i < args.length; i++) |
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{ |
124 | 0 | Object value = args[i]; |
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|
126 | 0 | Node spNode = doc.createElement("sp"); |
127 | 0 | rootNode.appendChild(spNode); |
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|
129 | 0 | Node valueNode = doc.createTextNode(value.toString()); |
130 | 0 | spNode.appendChild(valueNode); |
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} |
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} |
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|
134 | 0 | TransformerFactory trf = TransformerFactory.newInstance(); |
135 | 0 | Transformer tr = trf.newTransformer(); |
136 | 0 | tr.setOutputProperty(OutputKeys.INDENT, "yes"); |
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|
138 | 0 | DOMSource domSrc = new DOMSource(doc); |
139 | 0 | StringWriter writer = new StringWriter(); |
140 | 0 | StreamResult res = new StreamResult(writer); |
141 | 0 | tr.transform(domSrc, res); |
142 | 0 | writer.close(); |
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|
144 | 0 | return writer.toString(); |
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} |
146 | 0 | catch (Exception e) |
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{ |
148 | 0 | _exceptionReporter.reportRequestException("Cannot generate XML", e); |
149 | 0 | return null; |
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} |
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} |
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public void setExceptionReporter(RequestExceptionReporter exceptionReporter) |
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{ |
155 | 0 | _exceptionReporter = exceptionReporter; |
156 | 0 | } |
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|
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public void setResponse(WebResponse response) |
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{ |
160 | 0 | _response = response; |
161 | 0 | } |
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public void setLinkFactory(LinkFactory linkFactory) |
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{ |
165 | 0 | _linkFactory = linkFactory; |
166 | 0 | } |
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|
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} |