Java tutorial
// Copyright 2006 Chibacon /* * * Artistic License * * Preamble * * The intent of this document is to state the conditions under which a Package may be copied, such that * the Copyright Holder maintains some semblance of artistic control over the development of the * package, while giving the users of the package the right to use and distribute the Package in a * more-or-less customary fashion, plus the right to make reasonable modifications. * * Definitions: * * "Package" refers to the collection of files distributed by the Copyright Holder, and derivatives * of that collection of files created through textual modification. * * "Standard Version" refers to such a Package if it has not been modified, or has been modified * in accordance with the wishes of the Copyright Holder. * * "Copyright Holder" is whoever is named in the copyright or copyrights for the package. * * "You" is you, if you're thinking about copying or distributing this Package. * * "Reasonable copying fee" is whatever you can justify on the basis of media cost, duplication * charges, time of people involved, and so on. 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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.ui; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.xerces.dom.NodeImpl; import org.chiba.xml.events.ChibaEventNames; import org.chiba.xml.ns.NamespaceConstants; import org.chiba.xml.xforms.core.Model; import org.chiba.xml.xforms.exception.XFormsException; import org.chiba.xml.xforms.ui.state.BoundElementState; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import java.util.ArrayList; import java.util.HashMap; import java.util.List; /** * Implementation of <b>9.2.1 The switch Element</b>. * * @author Ulrich Nicolas Lissé * @version $Id: Switch.java,v 1.1 2009/02/17 09:00:53 civilis Exp $ */ public class Switch extends BindingElement { protected static Log LOGGER = LogFactory.getLog(Switch.class); private Case selected = null; private boolean initAfterReady = false; /** * Creates a new switch element handler. * * @param element the host document element. * @param model the context model. */ public Switch(Element element, Model model) { super(element, model); } // switch specific methods /** * Returns the currently selected Case. * * @return the currently selected Case. */ public Case getSelected() { return this.selected; } /** * Sets the currently selected Case. * * @param selected the the currently selected Case. */ public void setSelected(Case selected) { this.selected = selected; } // lifecycle methods /** * Performs element init. * * @throws XFormsException if any error occurred during init. */ public void init() throws XFormsException { if (getLogger().isDebugEnabled()) { getLogger().debug(this + " init"); } initializeDefaultAction(); initializeInstanceNode(); initializeElementState(); initializeChildren(); initializeSwitch(); } /** * Performs element update. * * @throws XFormsException if any error occurred during update. */ public void refresh() throws XFormsException { if (getLogger().isDebugEnabled()) { getLogger().debug(this + " update"); } updateElementState(); updateChildren(); updateSwitch(); } /** * Performs element disposal. * * @throws XFormsException if any error occurred during disposal. */ public void dispose() throws XFormsException { if (getLogger().isDebugEnabled()) { getLogger().debug(this + " dispose"); } disposeDefaultAction(); disposeChildren(); disposeElementState(); disposeSwitch(); disposeSelf(); } // lifecycle template methods /** * Initializes the Case elements. * <p/> * If multiple Cases within a Switch are selected, the first selected Case * remains and all others are deselected. If none are selected, the first * becomes selected. */ protected final void initializeSwitch() throws XFormsException { NodeList childNodes = getElement().getChildNodes(); List cases = new ArrayList(childNodes.getLength()); Node node; Case caseElement; String selectedAttribute; int selection = -1; for (int index = 0; index < childNodes.getLength(); index++) { node = childNodes.item(index); if (node.getNodeType() == Node.ELEMENT_NODE && NamespaceConstants.XFORMS_NS.equals(node.getNamespaceURI()) && CASE.equals(node.getLocalName())) { caseElement = (Case) ((NodeImpl) node).getUserData(); cases.add(caseElement); selectedAttribute = caseElement.getXFormsAttribute(SELECTED_ATTRIBUTE); if ((selection == -1) && ("true").equals(selectedAttribute)) { // keep *first* selected case position selection = cases.size() - 1; } } } if (selection == -1) { if (getLogger().isDebugEnabled()) { getLogger().debug(this + " init: choosing first case for selection by default"); } // select first case if none is selected selection = 0; } // perform selection/deselection for (int index = 0; index < cases.size(); index++) { caseElement = (Case) cases.get(index); if (index == selection) { if (getLogger().isDebugEnabled()) { getLogger().debug(this + " init: selecting case '" + caseElement.getId() + "'"); } caseElement.select(); } else { if (getLogger().isDebugEnabled()) { getLogger().debug(this + " init: deselecting case '" + caseElement.getId() + "'"); } caseElement.deselect(); } } // set state for updateSwitch() this.initAfterReady = this.model.isReady(); } /** * Updates the Switch element. */ protected final void updateSwitch() throws XFormsException { // if init happened after xforms-ready we are are part of repeat insert // processing so we have to dispatch an event to propagate the initial // selection state if (this.initAfterReady) { // dispatch internal chiba event HashMap map = new HashMap(); map.put("selected", this.selected.getId()); this.container.dispatch(this.target, ChibaEventNames.SWITCH_TOGGLED, map); // reset state to prevent event being dispatched more than once this.initAfterReady = false; } } /** * Disposes the Switch element. */ protected final void disposeSwitch() { this.selected = null; } // template methods /** * Factory method for the element state. * * @return an element state implementation or <code>null</code> if no state * keeping is required. * @throws XFormsException if an error occurred during creation. */ protected UIElementState createElementState() throws XFormsException { return isBound() ? new BoundElementState(false, false) : null; } } // end of class