you have to implement stateholder interface: http://myfaces.apache.org/core12/myfaces-api/apidocs/javax/faces/component/StateHolder.html
like here, for instance: http://svn.apache.org/viewvc/myfaces/core/trunk_1.2.x/api/src/main/java/javax/faces/convert/DateTimeConverter.java?view=markup http://svn.apache.org/viewvc/myfaces/core/trunk_1.2.x/api/src/main/java/javax/faces/convert/NumberConverter.java?view=markup -Matthias On Sat, Mar 21, 2009 at 12:41 PM, Bart Kummel <[email protected]> wrote: > Hi, > > I'm trying to write a custom converter that converts the casing of text. > Therefor I want a "type" attribute that let's me choose if I want to convert > to lower case, UPPER CASE or Title Case. This is what I've done so far: > > Created converter class > I've created a class, CaseConverter.java: > package my.company.conversion; > > import javax.faces.component.UIComponent; > import javax.faces.context.FacesContext; > import javax.faces.convert.Converter; > > public class CaseConverter implements Converter { > private String type = "lower"; > > public Object getAsObject(FacesContext context, UIComponent component, > String string) { > String result = ""; > if ("upper".equals(getType())){ > return string.toUpperCase(); > } else if ("title".equals(getType())) { > return toTitleCase(string); > } else { > return string.toLowerCase(); > } > return result; > } > > private String toTitleCase(String string){ > // left out for brevity > } > > public synchronized String getAsString(FacesContext context, UIComponent > component, Object object) { > return object.toString(); > } > > public void setType(String type) { > if (type != null) { > this.type = type.toLowerCase(); > } > } > > public String getType() { > return type; > } > } > > Registered converter in faces-config.xml > As follows: > <converter> > <description>Case converter for text values</description> > <converter-id>convertCase</converter-id> > <converter-class>my.company.conversion.CaseConverter</converter-class> > </converter> > > Added to Facelets taglib > I already had a my.taglib.xml file for some composition components, so I > added my converter there: > <tag> > <tag-name>convertCase</tag-name> > <converter> > <converter-id>convertCase</converter-id> > </converter> > </tag> > > Used the converter in a page > I added the converter to a page, like this: > <my:field id="jobTitle" bean="#{pageFlowScope.selectedEmployee}" > > <my:convertCase type="title"/> > </my:field> > The <my:field> component is a Facelets Composition Component, defined as > follows: > <ui:composition> > <c:if test="#{empty autoComplete}"> > <c:set var="autoComplete" value="on" /> > </c:if> > > <c:if test="#{empty simple}"> > <c:set var="simple" value="false" /> > </c:if> > > <!-- This is a work around for bug TRINIDAD-1390. --> > <c:if test="#{empty maximumLength}"> > <c:if test="#{columns gt 1}"> > <c:set var="maximumLength" value="2147483647" /> > </c:if> > </c:if> > > <!-- This is a work around for bug TRINIDAD-1417. --> > <c:if test="#{not empty partialTriggers}"> > <c:set var="partialTriggers" > value="#{my:getStringArray(partialTriggers)}" /> > </c:if> > > <tr:inputText value="#{bean[id]}" id="#{id}" required="#{required}" > readOnly="#{readOnly}" > label="#{msg[id]}:" secret="#{secret}" > maximumLength="#{maximumLength}" columns="#{columns}" > rows="#{rows}" wrap="#{wrap}" autoComplete="#{autoComplete}" > simple="#{simple}" > partialTriggers="#{partialTriggers}" > > <ui:insert/> > </tr:inputText> > </ui:composition> > > Versions used: > Apache MyFaces 1.2.4 > Apache MyFaces Trinidad 1.2.10 > Facelets 1.1.14 > > Problem description: > Everything works fine, except that the method setType() is only called > before a call to getAsString(). I figured out that: > > Everytime the converter is needed, a new instance of the class is > constructed. > Before every call to getAsString() the setType() is called with the value > set in the tag attribute ("title" in this case). > Before a call to getAsObject() the setType() method is not called. This > causes the strings to always be converted to lower case, which is de > default. > > Is this normal behaviour? What should I do to get it right? I hope someine > can help... > > Best regards, > Bart Kummel > -- Matthias Wessendorf blog: http://matthiaswessendorf.wordpress.com/ sessions: http://www.slideshare.net/mwessendorf twitter: http://twitter.com/mwessendorf
