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.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.chiba.xml.events.ChibaEventNames; import org.chiba.xml.xforms.XFormsConstants; import org.chiba.xml.xforms.core.Model; import org.chiba.xml.xforms.exception.XFormsException; import org.chiba.xml.xforms.exception.XFormsLinkError; import org.w3c.dom.Element; import org.w3c.dom.Node; import java.util.HashMap; /** * Implements the action as defined in <code>10.1.12 The message * Element</code>. * * @author Ulrich Nicolas Lissé * @version $Id: MessageAction.java,v 1.1 2009/02/17 09:00:53 civilis Exp $ */ public class MessageAction extends AbstractBoundAction { protected static Log LOGGER = LogFactory.getLog(MessageAction.class); private String levelAttribute; private String textContent; /** * Creates a message action implementation. * * @param element the element. * @param model the context model. */ public MessageAction(Element element, Model model) { super(element, model); } // lifecycle methods /** * Performs element init. */ public void init() throws XFormsException { super.init(); this.levelAttribute = getXFormsAttribute(LEVEL_ATTRIBUTE); if (this.levelAttribute == null) { getLogger().warn(this + " init: required level attribute missing, assuming 'modal'"); this.levelAttribute = "modal"; } Node child = this.element.getFirstChild(); if ((child != null) && (child.getNodeType() == Node.TEXT_NODE)) { this.textContent = child.getNodeValue(); } else { this.textContent = ""; } } // implementation of 'org.chiba.xml.xforms.action.XFormsAction' /** * Performs the <code>message</code> action. * * @throws XFormsException if an error occurred during <code>message</code> * processing. */ public void perform() throws XFormsException { super.perform(); String bindAttribute = getXFormsAttribute(BIND_ATTRIBUTE); String refAttribute = getXFormsAttribute(REF_ATTRIBUTE); String srcAttribute = getXFormsAttribute(XFormsConstants.SRC_ATTRIBUTE); String message = ""; if (bindAttribute != null || refAttribute != null) { // get message from instance data message = this.model.getInstance(getInstanceId()).getNodeValue(getLocationPath()); } else if (srcAttribute != null) { // get message from link Object result; try { result = this.container.getConnectorFactory().createURIResolver(srcAttribute, this.element) .resolve(); } catch (Exception e) { throw new XFormsLinkError("uri resolution failed at " + this, e, this.model.getTarget(), srcAttribute); } try { message = JXPathContext.newContext(result).getValue("/").toString(); } catch (Exception e) { throw new XFormsLinkError("object model not supported at " + this, e, this.model.getTarget(), srcAttribute); } } else { // get message from text child message = this.textContent; } // dispatch internal chiba event HashMap map = new HashMap(); map.put("message", message); map.put("level", this.levelAttribute); this.container.dispatch(this.target, ChibaEventNames.RENDER_MESSAGE, map); } } // end of class