Java tutorial
/* * Copyright (c) 2000-2004 Netspective Communications LLC. All rights reserved. * * Netspective Communications LLC ("Netspective") permits redistribution, modification and use of this file in source * and binary form ("The Software") under the Netspective Source License ("NSL" or "The License"). The following * conditions are provided as a summary of the NSL but the NSL remains the canonical license and must be accepted * before using The Software. Any use of The Software indicates agreement with the NSL. * * 1. Each copy or derived work of The Software must preserve the copyright notice and this notice unmodified. * * 2. Redistribution of The Software is allowed in object code form only (as Java .class files or a .jar file * containing the .class files) and only as part of an application that uses The Software as part of its primary * functionality. No distribution of the package is allowed as part of a software development kit, other library, * or development tool without written consent of Netspective. Any modified form of The Software is bound by these * same restrictions. * * 3. Redistributions of The Software in any form must include an unmodified copy of The License, normally in a plain * ASCII text file unless otherwise agreed to, in writing, by Netspective. * * 4. The names "Netspective", "Axiom", "Commons", "Junxion", and "Sparx" are trademarks of Netspective and may not be * used to endorse or appear in products derived from The Software without written consent of Netspective. * * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED REPRESENTATIONS AND * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, * ARE HEREBY DISCLAIMED. * * NETSPECTIVE AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE OR ANY THIRD PARTY AS A * RESULT OF USING OR DISTRIBUTING THE SOFTWARE. IN NO EVENT WILL NETSPECTIVE OR ITS LICENSORS BE LIABLE FOR ANY LOST * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THE SOFTWARE, EVEN * IF IT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. */ package com.netspective.commons.validate.rule; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.netspective.commons.validate.ValidationContext; import com.netspective.commons.value.Value; import com.netspective.commons.value.ValueSource; import com.netspective.commons.value.source.StaticValueSource; public class DateValueValidationRule extends BasicValidationRule { private static final Log log = LogFactory.getLog(DateValueValidationRule.class); private String invalidNamedDateMessage = "{0} contains an invalid {1} date: {2} (pattern is {3})."; private String futureOnlyDateMessage = "{0} may only contain future dates (after {1})."; private String pastOnlyDateMessage = "{0} may only contain past dates (before {1})."; private String preMinDateDateMessage = "{0} may only contain dates after {1}."; private String postMaxDateMessage = "{0} may only contain dates before {1}."; private SimpleDateFormat format; private Date minDate; private Date maxDate; private ValueSource maxDateSource; private ValueSource minDateSource; private boolean futureOnly; private boolean pastOnly; /** * Translates a reserved date word such as "today" or "now" into the actual time * * @param str reserved string * * @return String actual time string */ public String translateTimeString(String str) { String xlatedDate = str; if (str != null && (str.startsWith("today") || str.startsWith("now"))) { Date dt = new Date(); xlatedDate = format(dt); } return xlatedDate; } /** * Translates a reserved date word such as "today" or "now" into the actual date * * @param str reserved string * * @return String actual date string */ public String translateDateString(String str) { String xlatedDate = str; if (str != null && (str.startsWith("today") || str.startsWith("now"))) { int strLength = 0; if (str.startsWith("today")) strLength = "today".length(); else strLength = "now".length(); Date dt = null; if (str.length() > strLength) { try { String opValueStr = null; if (str.charAt(strLength) == '+') opValueStr = str.substring(strLength + 1); else opValueStr = str.substring(strLength); int opValue = Integer.parseInt(opValueStr); Calendar calendar = new GregorianCalendar(); calendar.add(Calendar.DAY_OF_MONTH, opValue); dt = calendar.getTime(); xlatedDate = format(dt); } catch (Exception e) { log.error("Unable to translate date string " + str, e); } } else { dt = new Date(); xlatedDate = format(dt); } } return xlatedDate; } public SimpleDateFormat getFormat() { return format; } public void setFormat(SimpleDateFormat format) { this.format = format; } public String format(Date date) { synchronized (format) { return format.format(date); } } public Date parse(String text) throws ParseException { synchronized (format) { return format.parse(text); } } public String toPattern() { synchronized (format) { return format.toPattern(); } } public Date getMaxDate() { return maxDate; } public void setMaxDate(Date maxDate) { this.maxDate = maxDate; } public Date getMinDate() { return minDate; } public void setMinDate(Date minDate) { this.minDate = minDate; } public ValueSource getMaxDateSource() { return maxDateSource; } public void setMaxDateSource(ValueSource maxDate) throws ParseException { if (maxDate instanceof StaticValueSource) this.maxDate = parse(translateDateString(maxDate.getTextValue(null))); else maxDateSource = maxDate; } public ValueSource getMinDateSource() { return minDateSource; } public void setMinDateSource(ValueSource minDate) throws ParseException { if (minDate instanceof StaticValueSource) this.minDate = parse(translateDateString(minDate.getTextValue(null))); else minDateSource = minDate; } public boolean isFutureOnly() { return futureOnly; } public void setFutureOnly(boolean futureOnly) { this.futureOnly = futureOnly; } public boolean isPastOnly() { return pastOnly; } public void setPastOnly(boolean pastOnly) { this.pastOnly = pastOnly; } public String getInvalidNamedDateMessage() { return invalidNamedDateMessage; } public void setInvalidNamedDateMessage(String invalidNamedDateMessage) { this.invalidNamedDateMessage = invalidNamedDateMessage; } public String getFutureOnlyDateMessage() { return futureOnlyDateMessage; } public void setFutureOnlyDateMessage(String futureOnlyDateMessage) { this.futureOnlyDateMessage = futureOnlyDateMessage; } public String getPastOnlyDateMessage() { return pastOnlyDateMessage; } public void setPastOnlyDateMessage(String pastOnlyDateMessage) { this.pastOnlyDateMessage = pastOnlyDateMessage; } public String getPostMaxDateMessage() { return postMaxDateMessage; } public void setPostMaxDateMessage(String postMaxDateMessage) { this.postMaxDateMessage = postMaxDateMessage; } public String getPreMinDateDateMessage() { return preMinDateDateMessage; } public void setPreMinDateDateMessage(String preMinDateDateMessage) { this.preMinDateDateMessage = preMinDateDateMessage; } public Date getValueSourceOrDate(String name, Value value, ValueSource vs, ValidationContext vc, Date date) { if (vs == null) return date; String dateText = vs.getTextValue(vc.getValidationValueContext()); if (dateText == null) return date; try { return parse(dateText); } catch (ParseException e) { vc.addValidationError(value, getInvalidNamedDateMessage(), new Object[] { getValueCaption(vc), name, dateText, toPattern() }); return date; } } public boolean isValid(ValidationContext vc, Value value) { if (!isValidType(vc, value, Date.class)) return false; Date dateValue = (Date) value.getValue(); if (dateValue == null) return true; if (pastOnly || futureOnly) { Date now = new Date(); if (pastOnly && dateValue.after(now)) { vc.addValidationError(value, getPastOnlyDateMessage(), new Object[] { getValueCaption(vc), format(now) }); return false; } if (futureOnly && dateValue.before(now)) { vc.addValidationError(value, getFutureOnlyDateMessage(), new Object[] { getValueCaption(vc), format(now) }); return false; } } Date minimumDate = getValueSourceOrDate("Minimum", value, minDateSource, vc, minDate); if (minimumDate != null && dateValue.before(minimumDate)) { vc.addValidationError(value, getPreMinDateDateMessage(), new Object[] { getValueCaption(vc), format(minimumDate) }); return false; } Date maximumDate = getValueSourceOrDate("Maximum", value, maxDateSource, vc, maxDate); if (maximumDate != null && dateValue.after(maximumDate)) { vc.addValidationError(value, getPostMaxDateMessage(), new Object[] { getValueCaption(vc), format(maximumDate) }); return false; } return true; } }