Alloy Showcase - Liferay Faces

FacesContextHelperUtil

f:viewParam

f:viewParam lets JSF developer to process a parameter in the current view. As it behaves like f:param, it supports other interesting features like using Converter or Validator.

General Usage

Click on the link to see how the viewParam populates the backing bean value converted through CountryConverter.

Source Code

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<ui:composition xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://xmlns.jcp.org/jsf/html"
    xmlns:f="http://xmlns.jcp.org/jsf/core" xmlns:ui="http://xmlns.jcp.org/jsf/facelets">
    <f:metadata>
        <f:viewParam name="countryId" value="#{viewMetadataBackingBean.viewCountry}">
            <f:converter converterId="com.liferay.faces.showcase.converter.CountryConverter" />
        </f:viewParam>
    </f:metadata>
    <h:form>
        <h:messages/>
        <h:link includeViewParams="true" value="#{i18n['link']}">
            <f:param name="countryId" value="1" />
        </h:link>
        <h:outputText value="#{viewMetadataBackingBean.viewCountry.countryName}" />
    </h:form>
</ui:composition>
 
 
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@ManagedBean
@RequestScoped
public class ViewMetadataBackingBean {
    private String viewActionText;
    private Country viewCountry;
    public String getViewActionText() {
        return viewActionText;
    }
    public Country getViewCountry() {
        return viewCountry;
    }
    public void setViewActionText(String viewActionText) {
        this.viewActionText = viewActionText;
    }
    public void setViewCountry(Country viewCountry) {
        this.viewCountry = viewCountry;
    }
    public String viewAction() {
        PhaseId phaseId = FacesContext.getCurrentInstance().getCurrentPhaseId();
        String phaseName = phaseId.toString();
        this.viewActionText = "View action was executed in phase " + phaseName;
        return null;
    }
}
 
 
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@FacesConverter(value = "com.liferay.faces.showcase.converter.CountryConverter")
public class CountryConverter implements Converter {
    // Static field must be declared volatile in order for the double-check idiom to work (requires JRE 1.5+)
    private static volatile Map<Long, Country> countryMap;
    @Override
    public Object getAsObject(FacesContext facesContext, UIComponent uiComponent, String value) {
        Object countryObject = null;
        if ((value != null) && !"".equals(value)) {
            Long countryId = Long.parseLong(value);
            countryObject = getCountryMap(facesContext).get(countryId);
        }
        return countryObject;
    }
    @Override
    public String getAsString(FacesContext facesContext, UIComponent uiComponent, Object value) {
        String strValue = "";
        if (value != null) {
            Country country = (Country) value;
            strValue = Long.toString(country.getCountryId());
        }
        return strValue;
    }
    protected Map<Long, Country> getCountryMap(FacesContext facesContext) {
        Map<Long, Country> countryMap = CountryConverter.countryMap;
        // First check without locking (not yet thread-safe)
        if (countryMap == null) {
            synchronized (CountryConverter.class) {
                countryMap = CountryConverter.countryMap;
                // Second check with locking (thread-safe)
                if (countryMap == null) {
                    ELResolver elResolver = facesContext.getApplication().getELResolver();
                    ELContext elContext = facesContext.getELContext();
                    CountryService countryService = (CountryService) elResolver.getValue(elContext, null,
                            "countryService");
                    countryMap = CountryConverter.countryMap = countryService.getCountryMap();
                }
            }
        }
        return countryMap;
    }
}
 
 
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Liferay Faces Alloy 4.1.1 + Liferay Faces Bridge Implementation 5.0.0 + Showcase Common 4.0.0 + Liferay Faces Util 3.4.1 + Mojarra 2.2.20

Knoten: liferay-75cdbc7df5-zpxx7:8080: