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.chiba.xml.events.XFormsEventNames; import org.chiba.xml.xforms.core.Model; import org.chiba.xml.xforms.core.Validator; import org.chiba.xml.xforms.exception.XFormsBindingException; import org.chiba.xml.xforms.exception.XFormsException; import org.w3c.dom.Element; import java.math.BigDecimal; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * Implementation of <b>8.1.7 The range Element</b>. * * @author Ulrich Nicolas Lissé * @version $Id: Range.java,v 1.1 2009/02/17 09:00:53 civilis Exp $ */ public class Range extends AbstractFormControl { protected static Log LOGGER = LogFactory.getLog(Range.class); /** * Creates a new range element handler. * * @param element the host document element. * @param model the context model. */ public Range(Element element, Model model) { super(element, model); } // form control methods /** * Sets the value of this form control. * <p/> * The bound instance data is updated and the event sequence for this * control is executed. Event sequences are described in Chapter 4.6 of * XForms 1.0 Recommendation. * * @param value the value to be set. */ public void setValue(String value) throws XFormsException { if (isBound()) { this.model.getInstance(getInstanceId()).setNodeValue(getLocationPath(), value); dispatchValueChangeSequence(); } } // 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(); initializeRange(); initializeChildren(); initializeActions(); } /** * Initializes this range. * * @throws XFormsException if the datatype of the bound is not supported. */ protected final void initializeRange() throws XFormsException { if (!isBound()) { return; } // get model item datatype Validator validator = this.model.getValidator(); String datatype = getDatatype(); if (validator.isRestricted("decimal", datatype) || validator.isRestricted("float", datatype) || validator.isRestricted("double", datatype)) { // get bound value String value = getInstanceValue(); BigDecimal valueDecimal; if (value != null && value.length() > 0) { valueDecimal = new BigDecimal(value); } else { // set '0.0' as default value valueDecimal = new BigDecimal(0d); } // get step size BigDecimal stepDecimal; String stepAttribute = getXFormsAttribute(STEP_ATTRIBUTE); if (stepAttribute != null) { stepDecimal = new BigDecimal(stepAttribute); } else { // set '1.0' as default step stepDecimal = new BigDecimal(1d); this.element.setAttributeNS(null, STEP_ATTRIBUTE, stepDecimal.toString()); } // get range start BigDecimal startDecimal; String startAttribute = getXFormsAttribute(START_ATTRIBUTE); if (startAttribute != null) { startDecimal = new BigDecimal(startAttribute); } else { // set 'value - (2 * step)' as default start startDecimal = valueDecimal.subtract(stepDecimal.multiply(new BigDecimal(2d))); this.element.setAttributeNS(null, START_ATTRIBUTE, startDecimal.toString()); } // get range end BigDecimal endDecimal; String endAttribute = getXFormsAttribute(END_ATTRIBUTE); if (endAttribute != null) { endDecimal = new BigDecimal(endAttribute); } else { // set 'value + (2 * step)' as default end endDecimal = valueDecimal.add(stepDecimal.multiply(new BigDecimal(2d))); this.element.setAttributeNS(null, END_ATTRIBUTE, endDecimal.toString()); } if (valueDecimal.compareTo(startDecimal) < 0 || valueDecimal.compareTo(endDecimal) > 0) { this.model.getContainer().dispatch(this.target, XFormsEventNames.OUT_OF_RANGE, null); } return; } throw new XFormsBindingException("datatype not supported by range control", this.target, datatype); } } // end of class