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.ui; import org.apache.commons.jxpath.JXPathContext; import org.apache.log4j.Category; import org.chiba.xml.util.DOMUtil; import org.chiba.xml.xforms.Model; import org.chiba.xml.xforms.NamespaceCtx; import org.chiba.xml.xforms.exception.XFormsException; import org.chiba.xml.xforms.exception.XFormsLinkException; import org.w3c.dom.Element; /** * Implementation of <b>8.3.3 The label Element</b>, <b>8.3.4 The help * Element</b>, <b>8.3.5 The hint Element</b>, and <b>8.3.6 The alert * Element</b>. * * @author Ulrich Nicolas Lissé * @version $Id: Common.java,v 1.20 2004/12/13 00:11:49 unl Exp $ */ public class Common extends BoundElement { private static final Category LOGGER = Category.getInstance(Common.class); /** * Creates a new Common object. * * @param element the DOM Element * @param model the Model this Common Element belongs to */ public Common(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 { if (getLogger().isDebugEnabled()) { getLogger().debug(this + " init"); } String value = null; if (isBound()) { // get instance value value = getInstanceValue(); } if (isLinked()) { // get linked value String src = this.element.getAttributeNS(NamespaceCtx.XFORMS_NS, SRC_ATTRIBUTE); Object result; try { result = this.container.getConnectorFactory().createURIResolver(src, this.element).resolve(); } catch (Exception e) { throw new XFormsLinkException("uri resolution failed", e, this.model.getTarget(), src); } try { value = JXPathContext.newContext(result).getValue("/").toString(); } catch (Exception e) { throw new XFormsLinkException("object model not supported", e, this.model.getTarget(), src); } } if (value != null) { // initialize bound or linked value DOMUtil.removeAllChildren(this.element); this.element.appendChild(this.element.getOwnerDocument().createTextNode(value)); } else { // initialize children initializeChildren(); } } /** * Performs element update. * * @throws XFormsException if any error occurred during update. */ public void update() throws XFormsException { if (getLogger().isDebugEnabled()) { getLogger().debug(this + " update"); } if (isBound()) { // update text node String value = getInstanceValue(); this.element.getFirstChild().setNodeValue(value); return; } if (isLinked()) { // todo: configurable reload ??? return; } updateChildren(); } /** * Performs element disposal. * * @throws XFormsException if any error occurred during disposal. */ public void dispose() throws XFormsException { if (getLogger().isDebugEnabled()) { getLogger().debug(this + " dispose"); } if (!isBound() && !isLinked()) { disposeChildren(); } disposeSelf(); } // common specific methods /** * Checks wether this element is linked to an external resource. * <p/> * This element is considered linked if it has a <code>src</code> * attribute. * * @return <code>true</code> if this element is linked to an external * resource, otherwise <code>false</code>. */ public boolean isLinked() { return this.element.hasAttributeNS(NamespaceCtx.XFORMS_NS, SRC_ATTRIBUTE); } /** * Returns the logger object. * * @return the logger object. */ protected Category getLogger() { return LOGGER; } } // end of class