Java tutorial
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THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * */ package org.chiba.xml.xforms.action; import org.apache.commons.jxpath.JXPathContext; import org.apache.log4j.Category; import org.chiba.xml.xforms.Instance; import org.chiba.xml.xforms.Model; import org.chiba.xml.xforms.NamespaceCtx; import org.chiba.xml.xforms.events.EventFactory; import org.chiba.xml.xforms.exception.XFormsException; import org.chiba.xml.xforms.xpath.PathUtil; import org.w3c.dom.Element; /** * Implements the action as defined in <code>9.3.6 The delete Element</code>. * * @author Ulrich Nicolas Lissé * @version $Id: DeleteAction.java,v 1.29 2004/11/12 00:13:23 unl Exp $ */ public class DeleteAction extends AbstractBoundAction { private static Category LOGGER = Category.getInstance(DeleteAction.class); private String atAttribute; /** * Creates a new DeleteAction object. * * @param element the DOM Element * @param model the context Model */ public DeleteAction(Element element, Model model) { super(element, model); } // lifecycle methods /** * Performs element init. */ public void init() throws XFormsException { super.init(); this.atAttribute = this.element.getAttributeNS(NamespaceCtx.XFORMS_NS, AT_ATTRIBUTE); } // implementation of 'org.chiba.xml.xforms.Binding' /** * Returns the binding expression. * * @return the binding expression. */ public String getBindingExpression() { return this.element.getAttributeNS(NamespaceCtx.XFORMS_NS, NODESET_ATTRIBUTE); } // implementation of 'org.chiba.xml.xforms.action.XFormsAction' /** * Performs the <code>delete</code> action. * * @return <code>true</code> if delete executed successfully, otherwise * <code>false</code>. * @throws org.chiba.xml.xforms.exception.XFormsException if an error * occurred during <code>delete</code> processing. */ public boolean perform() throws XFormsException { // get instance String instanceId = getInstanceId(getLocationPath()); Instance instance = this.model.getInstance(instanceId); // get pathes String locationPath = stripInstanceFunction(getLocationPath()); String instancePath = locationPath + "[round(" + this.atAttribute + ")]"; // check for existing path if (instance.existsNode(instancePath)) { // canonicalize existing path JXPathContext context = instance.getInstanceContext(); instancePath = context.getPointer(instancePath).asPath(); // strip down to delete path and position String deletePath = PathUtil.stripLastPredicate(instancePath); String lastStep = PathUtil.lastStep(instancePath); int deletePosition = PathUtil.stepIndex(lastStep); // delete specified node and dispatch notification event instance.deleteNode(deletePath, deletePosition); this.container.dispatch(instance.getTarget(), EventFactory.DELETE, deletePath + "[" + deletePosition + "]"); // update behaviour setDeferredRebuild(this.model.getId(), true); setDeferredRecalculate(this.model.getId(), true); setDeferredRevalidate(this.model.getId(), true); setDeferredRefresh(this.model.getId(), true); } else { getLogger().warn(this + " perform: node " + instancePath + " does not exist"); } // always indicate success return true; } /** * Returns the logger object. * * @return the logger object. */ protected Category getLogger() { return LOGGER; } } // end of class