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package org.apache.tapestry.engine; |
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import java.io.IOException; |
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import java.util.HashMap; |
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import java.util.Map; |
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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.IDirectEvent; |
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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.StaleSessionException; |
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import org.apache.tapestry.Tapestry; |
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import org.apache.tapestry.event.BrowserEvent; |
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import org.apache.tapestry.services.LinkFactory; |
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import org.apache.tapestry.services.ResponseRenderer; |
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import org.apache.tapestry.services.ServiceConstants; |
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import org.apache.tapestry.web.WebRequest; |
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import org.apache.tapestry.web.WebSession; |
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public class DirectEventService implements IEngineService |
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{ |
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private ResponseRenderer _responseRenderer; |
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private LinkFactory _linkFactory; |
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private WebRequest _request; |
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private IRequestCycle _requestCycle; |
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public ILink getLink(boolean post, Object parameter) |
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{ |
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Defense.isAssignable(parameter, DirectEventServiceParameter.class, "parameter"); |
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DirectEventServiceParameter dsp = (DirectEventServiceParameter) parameter; |
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IComponent component = dsp.getDirect(); |
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IPage activePage = _requestCycle.getPage(); |
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IPage componentPage = component.getPage(); |
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Map parameters = new HashMap(); |
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boolean stateful = _request.getSession(false) != null; |
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parameters.put(ServiceConstants.PAGE, activePage.getPageName()); |
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parameters.put(ServiceConstants.COMPONENT, component.getIdPath()); |
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parameters.put(ServiceConstants.CONTAINER, componentPage == activePage ? null |
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: componentPage.getPageName()); |
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parameters.put(ServiceConstants.SESSION, stateful ? "T" : null); |
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if (dsp.getUpdateParts() != null && dsp.getUpdateParts().length > 0) |
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parameters.put(ServiceConstants.UPDATE_PARTS, dsp.getUpdateParts()); |
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if (dsp.isJSON()) |
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parameters.put("json", String.valueOf(dsp.isJSON())); |
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parameters.put(ServiceConstants.PARAMETER, dsp.getServiceParameters()); |
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return _linkFactory.constructLink(this, post, parameters, true); |
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} |
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public void service(IRequestCycle cycle) throws IOException |
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{ |
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String componentId = cycle.getParameter(ServiceConstants.COMPONENT); |
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String componentPageName = cycle.getParameter(ServiceConstants.CONTAINER); |
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String activePageName = cycle.getParameter(ServiceConstants.PAGE); |
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boolean activeSession = cycle.getParameter(ServiceConstants.SESSION) != null; |
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IPage page = cycle.getPage(activePageName); |
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cycle.activate(page); |
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IPage componentPage = componentPageName == null ? page : cycle.getPage(componentPageName); |
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IComponent component = componentPage.getNestedComponent(componentId); |
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IDirectEvent direct = null; |
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try |
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{ |
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direct = (IDirectEvent) component; |
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} |
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catch (ClassCastException ex) |
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{ |
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throw new ApplicationRuntimeException(EngineMessages.wrongComponentType( |
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component, |
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IDirectEvent.class), component, null, ex); |
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} |
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if (activeSession && direct.isStateful()) |
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{ |
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WebSession session = _request.getSession(false); |
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if (session == null || session.isNew()) |
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throw new StaleSessionException(EngineMessages.requestStateSession(direct), |
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componentPage); |
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} |
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Object[] parameters = _linkFactory.extractListenerParameters(cycle); |
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triggerComponent(cycle, direct, parameters); |
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_responseRenderer.renderResponse(cycle); |
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} |
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protected void triggerComponent(IRequestCycle cycle, IDirectEvent direct, Object[] parameters) |
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{ |
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if (!BrowserEvent.hasBrowserEvent(cycle)) |
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throw new ApplicationRuntimeException(EngineMessages.noBrowserEvent()); |
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BrowserEvent event = new BrowserEvent(cycle); |
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Object[] parms = new Object[parameters.length + 1]; |
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System.arraycopy(parameters, 0, parms, 0, parameters.length); |
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parms[parms.length - 1] = event; |
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cycle.setListenerParameters(parms); |
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direct.triggerEvent(cycle, event); |
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} |
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public String getName() |
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{ |
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return Tapestry.DIRECT_EVENT_SERVICE; |
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} |
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public void setResponseRenderer(ResponseRenderer responseRenderer) |
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{ |
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_responseRenderer = responseRenderer; |
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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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public void setRequest(WebRequest request) |
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{ |
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_request = request; |
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} |
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public void setRequestCycle(IRequestCycle requestCycle) |
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{ |
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_requestCycle = requestCycle; |
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} |
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} |