calendar - many formats

[marx3]

Is it possible to support two different formats of data at once in rich:calendar?

My users is used to two different formats (dd:mm:yyyy and dd/mm/yyyy) and I don't want to force them to use only one. I imagine there should be primary format and one that automatically will change into primary on blur.

[daniel.soneira]

I wrote a converter, that can handle several formats at once. Please consider that our projects build upon myfaces.

My code below shows a converter that is able to convert different inputs:
(Today is 14.01.2008)

"03" => "03.01.2008"
"0104" => "01.04.2008"
"9.5" => "09.05.2005"

Just change it to fit your needs.

By registering it as "standard" datetimeconverter you can use the f:convertDateTime tag.

 <converter>
 <converter-id>javax.faces.DateTime</converter-id>
 <converter-class>
 com.joynit.jsf.converter.DateTimeConverter
 </converter-class>
 </converter>

To "trigger" this converter after the input I use the following jsp-fragment (facelets tag, so please change accordingly). The important parts are f:convertDateTime and a4j:support.

<rich:calendar id="${id}"
 value="${value}"
 enableManualInput="true"
 popup="true"
 disabled="${disabled}"
 datePattern="dd.MM.yyyy"
 inputSize="10">
 <f:convertDateTime pattern="dd.MM.yyyy" timeZone="CET"/>
 <a4j:support event="oninputchange"
 reRender="${id}"
 ajaxSingle="true"/>
 </rich:calendar>

public class DateTimeConverter
 extends javax.faces.convert.DateTimeConverter
 implements DateConverter {

 @Override
 public String getAsString(
 FacesContext context,
 UIComponent component,
 Object value)
 throws ConverterException {
 if (value instanceof Calendar) {
 value = ((Calendar)value).getTime();
 }
 final String result = super.getAsString(
 context,
 component,
 value);
 return result;
 }

 @Override
 public Object getAsObject(
 FacesContext context,
 UIComponent component,
 String value)
 throws ConverterException {
 Object asObject = null;
 final Class componentType = this.getComponentType(
 context,
 component);
 if (componentType != null) {
 try {
 // insert zeroes [3.4.07 => 03.04.07]
 String[] tokens = value.split("\\.");
 String edited = "";
 for (int index=0; index < tokens.length; index++) {
 String token = tokens[index];
 if (token.length()==1) token = "0".concat(token);
 edited = edited.concat(token);
 }
 asObject = super.getAsObject(
 context,
 component,
 edited);
 if (Calendar.class.isAssignableFrom(componentType) && asObject instanceof Date) {
 final Calendar calendar = Calendar.getInstance();
 calendar.setTime((Date)asObject);
 asObject = calendar;
 }
 } catch (ConverterException ex) {
 asObject = fallbackParse(value, componentType, ex);
 }
 }
 return asObject;
 }

 private Object fallbackParse(String value, final Class componentType, ConverterException ex) {
 Object asObject = null;
 ArrayList<SimpleDateFormat> formats = new ArrayList<SimpleDateFormat>();
 formats.add(new SimpleDateFormat("ddMMyy"));
 formats.add(new SimpleDateFormat("ddMMyyyy"));
 formats.add(new SimpleDateFormat("dd.MM.yy"));
 formats.add(new SimpleDateFormat("dd.MM.yyyy"));

 String[] tokens = value.split("\\.");
 String edited = "";
 for (int index=0; index < tokens.length; index++) {
 String token = tokens[index];
 if (token.length()==1) token = "0".concat(token);
 if (index>0) edited = edited.concat(".");
 edited = edited.concat(token);
 }

 String currYear = String.valueOf(Calendar.getInstance().get(Calendar.YEAR));
 String currMonth = String.valueOf(Calendar.getInstance().get(Calendar.MONTH)+1);
 if (currMonth.length()==1) {
 currMonth = "0".concat(currMonth);
 }

 tokens = edited.split("\\.");

 // ONE dot [dd.MM]
 if (tokens.length == 2) {
 edited = tokens[0].concat(".").concat(tokens[1]).concat(".").concat(currYear);
 } else if (tokens.length == 1 && value.length()<4) {
 // no dots [dd]
 edited = edited.concat(currMonth).concat(currYear);
 } else if (tokens.length == 1 && value.length()<6) {
 // no dots [dd.MM]
 edited = edited.concat(currYear);
 }

 Date parsed = null;
 Iterator<SimpleDateFormat> it = formats.iterator();
 SimpleDateFormat format;

 while (parsed == null && it.hasNext()) {
 try {
 format = it.next();
 if (getTimeZone() != null) {
 format.setTimeZone(getTimeZone());
 }
 format.setLenient(false); // format cannot be lenient
 parsed = format.parse(edited);
 } catch (ParseException parseEx) {
 // no action necessary - just try next format
 }
 }

 // none of the fallback formats was recognized
 if (parsed == null) {
 throw ex; // rethrow original exception
 }

 if (Calendar.class.isAssignableFrom(componentType)) {
 final Calendar calendar = Calendar.getInstance();
 calendar.setTime(parsed);
 asObject = calendar;
 } else {
 asObject = parsed;
 }
 return asObject;
 }
 /**
 * Gets the component type for the given <code>component</code>.
 * @param context the current faces context.
 * @param component the component from which to retrieve the type.
 * @return true/false
 */
 private Class getComponentType(
 final FacesContext context,
 final UIComponent component) {
 Class type = null;
 final ValueBinding binding = component.getValueBinding("value");
 if (binding != null) {
 type = binding.getType(context);
 }
 return type;
 }

 /**
 * Gets the component Value for the given <code>component</code>.
 * @param context the current faces context.
 * @param component the component from which to retrieve the value.
 * @return true/false
 */
 private Object getComponentValue(
 final FacesContext context,
 final UIComponent component) {
 Object value = null;
 final ValueBinding binding = component.getValueBinding("value");
 if (binding != null) {
 value = binding.getValue(context);
 }
 return value;
 }

 public static final String CONVERTER_ID = "javax.faces.DateTime";

 /**
 * @see org.apache.myfaces.custom.calendar.HtmlCalendarRenderer.DateConverter#getAsDate(javax.faces.context.FacesContext, javax.faces.component.UIComponent)
 */
 public Date getAsDate(
 FacesContext context,
 UIComponent component) {
 Object value = this.getComponentValue(
 context,
 component);
 if (value instanceof Calendar) {
 value = ((Calendar)value).getTime();
 }
 return (Date)value;
 }
}

[marx3]

implements DateConverter - I can't find such interface

[marx3]

It seems this interface isn't needed - thank you! It works ok!

[daniel.soneira]

"Marx3" wrote:
It seems this interface isn't needed - thank you! It works ok!

DateConverter is an interface of MyFaces with only one method: "getAsDate".

Glad it worked for you - you're welcome :)