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.ui.Repeat; import org.chiba.xml.xforms.ui.RepeatItem; import org.chiba.xml.xforms.xpath.PathUtil; import org.w3c.dom.Element; /** * Implements the action as defined in <code>9.3.7 The setindex Element</code>. * * @author Ulrich Nicolas Lissé * @version $Id: SetIndexAction.java,v 1.26 2004/11/12 00:13:24 unl Exp $ */ public class SetIndexAction extends AbstractAction { private static Category LOGGER = Category.getInstance(SetIndexAction.class); private String indexAttribute; private String repeatAttribute; /** * Creates a new SetIndexAction object. * * @param element the DOM Element * @param model the context Model */ public SetIndexAction(Element element, Model model) { super(element, model); } // lifecycle methods /** * Performs element init. * * @throws XFormsException if any error occurred during init. */ public void init() throws XFormsException { super.init(); this.repeatAttribute = this.element.getAttributeNS(NamespaceCtx.XFORMS_NS, REPEAT_ATTRIBUTE); this.indexAttribute = this.element.getAttributeNS(NamespaceCtx.XFORMS_NS, INDEX_ATTRIBUTE); } // implementation of 'org.chiba.xml.xforms.action.XFormsAction' /** * Performs the <code>setindex</code> action. * * @return always <code>true</code>. * @throws XFormsException if an error occurred during <code>setindex</code> * processing. */ public boolean perform() throws XFormsException { // lookup repeat element Repeat repeat = (Repeat) this.container.lookup(this.repeatAttribute); // todo: check wether this interpretation is correct/useful and write a test for it String locationPath; if (isRepeated()) { // use the enclosing repeat as context RepeatItem repeatItem = (RepeatItem) getContainerObject().lookup(getRepeatItemId()); locationPath = repeatItem.getLocationPath() + "[" + this.indexAttribute + "]"; } else { // use the target repeat as context locationPath = repeat.getLocationPath() + "[" + this.indexAttribute + "]"; } // get instance Instance instance = repeat.getModel().getInstance(repeat.getInstanceId()); JXPathContext context = instance.getInstanceContext(); int index; if (instance.existsNode(locationPath)) { // compute index from position String instancePath = context.getPointer(locationPath).asPath(); index = PathUtil.stepIndex(PathUtil.lastStep(instancePath)); } else { // compute index w/o context index = ((Integer) context.getValue(this.indexAttribute, java.lang.Integer.class)).intValue(); } // check boundaries if (index < 1) { repeat.setIndex(1); this.container.dispatch(repeat.getTarget(), EventFactory.SCROLL_FIRST, null); } else if (index > repeat.getContextSize()) { index = repeat.getContextSize(); repeat.setIndex(index); this.container.dispatch(repeat.getTarget(), EventFactory.SCROLL_LAST, null); } else { // set repeat index repeat.setIndex(index); } // update behaviour (defined by chiba ;-) setDeferredRefresh(repeat.getModel().getId(), true); // always indicate success return true; } /** * Returns the logger object. * * @return the logger object. */ protected Category getLogger() { return LOGGER; } } // end of class