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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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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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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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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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{ |
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return SERVICE_NAME; |
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} |
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public ILink getLink(boolean post, Object parameter) |
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{ |
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Defense.isAssignable(parameter, IComponent.class, "parameter"); |
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IComponent component = (IComponent) parameter; |
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Map parameters = new HashMap(); |
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parameters.put(ServiceConstants.PAGE, component.getPage().getPageName()); |
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parameters.put(ServiceConstants.COMPONENT, component.getIdPath()); |
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return _linkFactory.constructLink(this, false, parameters, false); |
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} |
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public void service(IRequestCycle cycle) throws IOException |
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{ |
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String pageName = cycle.getParameter(ServiceConstants.PAGE); |
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String componentId = cycle.getParameter(ServiceConstants.COMPONENT); |
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IPage componentPage = cycle.getPage(pageName); |
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IComponent component = componentPage.getNestedComponent(componentId); |
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if (!(component instanceof IXTile)) |
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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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IXTile xtile = (IXTile) component; |
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String[] params = cycle.getParameters(ServiceConstants.PARAMETER); |
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cycle.setListenerParameters(params); |
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xtile.trigger(cycle); |
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Object[] args = cycle.getListenerParameters(); |
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String strArgs = generateOutputString(args); |
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if (strArgs != null) |
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{ |
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OutputStream output = _response.getOutputStream(new ContentType("text/xml")); |
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output.write(strArgs.getBytes("utf-8")); |
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} |
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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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{ |
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DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); |
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dbf.setValidating(false); |
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DocumentBuilder db = dbf.newDocumentBuilder(); |
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Document doc = db.newDocument(); |
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Node rootNode = doc.createElement("data"); |
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doc.appendChild(rootNode); |
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if (args != null) |
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{ |
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for (int i = 0; i < args.length; i++) |
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{ |
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Object value = args[i]; |
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Node spNode = doc.createElement("sp"); |
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rootNode.appendChild(spNode); |
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Node valueNode = doc.createTextNode(value.toString()); |
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spNode.appendChild(valueNode); |
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} |
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} |
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TransformerFactory trf = TransformerFactory.newInstance(); |
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Transformer tr = trf.newTransformer(); |
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tr.setOutputProperty(OutputKeys.INDENT, "yes"); |
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DOMSource domSrc = new DOMSource(doc); |
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StringWriter writer = new StringWriter(); |
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StreamResult res = new StreamResult(writer); |
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tr.transform(domSrc, res); |
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writer.close(); |
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return writer.toString(); |
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} |
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catch (Exception e) |
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{ |
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_exceptionReporter.reportRequestException("Cannot generate XML", e); |
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return null; |
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} |
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} |
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public void setExceptionReporter(RequestExceptionReporter exceptionReporter) |
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{ |
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_exceptionReporter = exceptionReporter; |
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} |
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public void setResponse(WebResponse response) |
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{ |
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_response = response; |
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} |
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public static void main(String[] args) |
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{ |
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XTileService objService = new XTileService(); |
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System.out.println(objService.generateOutputString(new Object[] |
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{ "test > work", new Integer(20) })); |
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} |
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public void setLinkFactory(LinkFactory linkFactory) |
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{ |
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_linkFactory = linkFactory; |
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} |
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} |