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OmniFaces is an utility library for JSF, including PrimeFaces, RichFaces, ICEfaces ...

[OmniFaces Utilities] - Find the right JSF OmniFaces 2 utilities methods/functions

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luni, 7 noiembrie 2016

JSF 2.3 comes with @ManagedProperty compatible with CDI

The JSF managed bean annotations will be deprecated in JSF 2.3. This includes @ManagedProperty as well. But, compared to other annotations, this one has got an implementation that can be used with CDI managed beans. So, in CDI managed beans we can use the new, javax.faces.annotation.ManagedProperty. Let's see an example of injecting an instance of SourceBean into TargetBean, and a property of SourceBean into TargetBean:

@Named
@RequestScoped
public class SourceBean {

 private String source;
   
 @PostConstruct
 public void init(){
  source = "SourceBean";
 }

 public String getSource() {
  return source;
 }

 public void setSource(String source) {
  this.source = source;
 }       
}

import javax.faces.annotation.ManagedProperty;
...
@Named
@RequestScoped
public class TargetBean {

 @Inject @ManagedProperty("#{sourceBean}")
 private SourceBean sourceBean;
   
 @Inject @ManagedProperty("#{sourceBean.source}")
 private String source;
   
 public void targetAction(){
  System.out.println("Injected bean: " + sourceBean);
  System.out.println("Injected property (via injected bean): " + sourceBean.getSource());
  System.out.println("Injected property: " + source);
 }
}

The complete example is available here.

duminică, 6 noiembrie 2016

duminică, 31 iulie 2016

[OmniFaces utilities (2.4)] Format the given number to nearest 10^n (rounded to thousands)


[OmniFaces utilities] The formatThousands() formats the given number to nearest 10n (rounded to thousands), immediately suffixed (without space) with metric unit (k, M, G, T, P or E), rounding half up with a precision of 3 digits, whereafter trailing zeroes in fraction part are stripped. Numbers lower than thousand are not affected. The format locale will be set to the one as obtained by Faces#getLocale(). If the value is null, NaN or infinity, then this will return null.

This function is available from OmniFaces 2.3, but in OmniFaces 2.4, the incorrectly trimmed trailing zeroes from non-fractional integer numbers was fixed and now also supports cutting down fractions of values lower than thousand.

Function:

Usage:

// 9.99 k
#{of:formatThousandsUnit(9994)}
      
// 10 M
#{of:formatThousandsUnit(9995000)}

// 532 k
#{of:formatThousandsUnit(532230.6483)}

sâmbătă, 23 iulie 2016

[OmniFaces utilities (2.4)] Format the given number to nearest 10^n, suffixed with a space, the metric unit prefix and the given unit


[OmniFaces utilities] The formatThousandsUnit() formats the given number to nearest 10n (rounded to thousands), suffixed with a space, the metric unit prefix (k, M, G, T, P or E) and the given unit, rounding half up with a precision of 3 digits, whereafter trailing zeroes in fraction part are stripped. The format locale will be set to the one as obtained by Faces#getLocale(). If the value is null, NaN or infinity, then this will return null.The given unit used in the format is of type B for Bytes, W for Watt, etc. If the unit is null, then this method will behave exactly as described in #formatThousands(Number).

This function is available from OmniFaces 2.3, but in OmniFaces 2.4, the incorrectly trimmed trailing zeroes from non-fractional integer numbers was fixed and now also supports cutting down fractions of values lower than thousand.

Function:

Usage:

// 9.99 kB
#{of:formatThousandsUnit(9994  , "B")}
      
// 10 MW
#{of:formatThousandsUnit(9995000 , "W")}
 
// 532 kFOO
#{of:formatThousandsUnit(532230.6483 , "FOO")}

duminică, 17 iulie 2016

[OmniFaces utilities (2.4)] Get all request query string or view parameters appended with all child UIParameter components of the given parent component


[OmniFaces utilities] The getParams() returns an unmodifiable map with all request query string or view parameters, appended with all child UIParameter components (<f|o:param>) of the given parent component. Those with disabled=true or an empty name or an empty value are skipped. The <f|o:param> will override any included view or request parameters on the same name.

Method:
Usage:

Let's suppose that we have the following page:

<f:metadata>
 <f:viewParam name="playernameparam" value="#{playersBean.playerName}"/>           
 <f:viewParam name="playersurnameparam" value="#{playersBean.playerSurname}"/>
</f:metadata>
<h:head>
 <title></title>
</h:head>  
<h:body>    
 <h:panelGrid columns="2">
  <h:form id="form">
   <h:commandButton id="submit" value="Get all params" action="#{playersBean.allParams()}">   
    <f:param name="ageParam" value="29"/>
    <o:param name="playParam" value="left"/>
   </h:commandButton>
  </h:form>                 
 </h:panelGrid>
</h:body>

Further, we can use the Components#getParams() utility to programmatically collect the UIParameters  (<f|o:param/>) nested in the above <h:commandButton/> and the view parameters. This can be accomplish in different JSF artifacts; for example, in a bean (obviously, there are several ways to identify the parent UIComponent of the UIParameters that we want to collect - the UIComponent that should be passed to the #getParams() should be obtained in a convenient manner depending on your circumstances; below, we simply used the Components#findComponent() utility):

import org.omnifaces.util.Components;
...
public void allParams() {
              
 UIComponent uc = Components.findComponent("form:submit");
 Map<String, List<String>> paramsMap = Components.getParams(uc, false, true);

 for (Map.Entry<String, List<String>> entry : paramsMap.entrySet()) {
      System.out.println("Param: "+ entry.getKey() + "/" + entry.getValue());
 }
}

Let's suppose that we start the application with an URL like this:

http://myapp/?playernameparam=rafael&playersurnameparam=nadal

After we press the Get all params button the server log will reveal the following output:

Param: playernameparam/[rafael]
Param: playersurnameparam/[nadal]
Param: ageParam/[29]
Param: playParam/[left]

sâmbătă, 9 iulie 2016

[OmniFaces utilities (2.4)] Get the HTTP request URL with query string, regardless of any forward


[OmniFaces utilities] The getRequestURL() method returns the HTTP request URL with query string, regardless of any forward. This is the full request URL without query string as the enduser sees in browser address bar.

Method:

Usage:

import org.omnifaces.util.Servlets;
...
@WebServlet("/MyServlet")
public class MyServlet extends HttpServlet {
 protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // e.g. http://localhost:8080/MyApp/MyServlet
  String req = Servlets.getRequestURL(request);
 }
 ...
}

miercuri, 6 iulie 2016

[OmniFaces utilities (2.4)] Get the HTTP request query string, regardless of any forward


[OmniFaces utilities] The getRequestQueryString() method returns the HTTP request query string, regardless of any forward.

Method:
Use this one outside JSF context
(Servlets#getRequestQueryString())
See also: Utils.coalesce()
Use this one in JSF context
(Faces#getRequestQueryString())
See also:  Faces.getRequest() | Faces.getContext()
Usage:

Some use cases are available right in OmniFaces source code. For example, OmniFaces uses getRequestQueryString() to get the HTTP request URI with query string, regardless of any forward:

public static String getRequestURIWithQueryString(HttpServletRequest request) {
 String requestURI = getRequestURI(request);
 String queryString = getRequestQueryString(request);
 return (queryString == null) ? requestURI : (requestURI + "?" + queryString);
}

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