Develop Reference

Using a String that contains operators as a variable on an if-statement

Title is self-explanatory.
Instead of using:
if (link.contains(".com") || (link.contains(".net") || (link.contains(".org") || (link.contains(".info") || ("etc there are many domain names")) {
webView.loadUrl("https://www." + link);
} else {
webView.loadUrl("https://www." + link + ".com");
}
I want to do it this way if possible by declaring the String's values globally.
if (link.contains(domainNames)) {
webView.loadUrl("https://www." + link);
} else {
webView.loadUrl("https://www." + link + ".com");
}

Build a regex with the domain names, then test it, e.g.
private static final Pattern DOMAIN_NAMES = Pattern.compile("\\.(?i:com|net|org|info)$");
if (DOMAIN_NAMES.matcher(link).find()) {
webView.loadUrl("https://www." + link);
} else {
webView.loadUrl("https://www." + link + ".com");
}

Another mannual approach could be :
Domainnamelist.contains(substring from link that contains domain ending)

Building Hibernate query depending of parameters that can be nulls

so i am working on a project right now
1st time using Hibernate
in this projet i am using Swing too
i have a form with multiple jTextFields
public List<Object[]> getoperations(String a,String c,String n,String e,String d) {
SessionDao s=new SessionDao();
session=s.getSession();
Query q;
q=session.createQuery("select idTiers,beneficiaire,emetteur,montant,numcompte,t_param_nature_operation.libelleNature,dateValidite,dateCreation where");
if (a != null && !a.isEmpty()) { q+= " and codeBanque='" + a + "'"; }
if (c != null && !c.isEmpty()) { q += " and numCompte='" + c + "'"; }
if (n != null && !n.isEmpty()) { q += " and t_param_nature_operation_.libelleNature='" + n + "'"; }
if (e != null && !e.isEmpty()) { q += " and decision='" + e + "'"; }
if (d != null && !d.isEmpty()) { q += " and dateCreation='" + d + "'"; }
q+= " order by idTiers" ;
return q.list();
}
As you see I am making a test on the values to add them in the query.
My question is there a way to add those values?
since query +="" isn't working.

Personally, I would add Guava utils to my project and use isNotBlank()
function. Anyway, you can write your own static function that would
return true if not null and not empty and false otherwise, and later
use it. It'll make your code much clearer.
The above was my comment and I decided to show you this little piece of code.
public static boolean isBlank(String s) {
if (s == null)
return true;
if (s.isEmpty())
return true;
return false;
}
Now you can simply write:
//static import your isBlank() method
//import static package.classInWhichIsBlankIsDeclared;
if (!isBlank(a) { q+= " and codeBanque='" + a + "'"; }
if (!isBlank(b) { q+= " and codeBanque='" + b + "'"; }
if (!isBlank(c) { q+= " and codeBanque='" + c + "'"; }
if (!isBlank(d) { q+= " and codeBanque='" + d + "'"; }
It's much more readable so it'll be much easier to debug in case of errors in the future.
Please, have a look at DRY principle and follow it. If your issue require checking same condition 4 or 5 times (2 times should be enough to use DRY) consider writing a function. call it the way that it'll be human-friendly instead of combination of different logical statements.
DRY. Don't Repeat Yourself.
"Every piece of knowledge must have a single, unambiguous, authoritative representation within a system"
Wikipedia article about DRY

you should consider using Criteria. it's more clean when dealing with multiple where statements.
eg
Criteria cr = session.createCriteria(YourEntityClass.class);
cr.add(Restrictions.eq("property1", value1));
cr.add(Restrictions.eq("property2", value2));
List results = cr.list();
have a look at these examples here

Java object declaration following return;?

I came across some unfamiliar Java syntax while looking at some code from jstl 1.1.2. It occurs to me the code I'm looking at was reverse compiled by Beyond Compare (or a plug-in thereof), so that might have something to do with it.
The code at the end of the method looks like this:
...
p.parse(page.getInputStream(), h);
if(failed)
return vmFromString("taglib " + prefix + " (" + uri + ") allows only the " +
"following taglibs to be imported: " + permittedTaglibs);
return null;
SaxException ex;
ex;
return vmFromString(ex.toString());
ex;
return vmFromString(ex.toString());
ex;
return vmFromString(ex.toString());
}
In jstl 1.1, before they refactored the PermittedTaglibsHandler, it looks like this:
...
saxparser.parse(pagedata.getInputStream(), permittedtaglibshandler);
if(failed)
return vmFromString("taglib " + s+ " (" + s1+ ") allows only the " +
"following taglibs to be imported: " + permittedTaglibs);
return null;
Object obj;
obj;
return vmFromString(((SaxException) (obj)).toString());
obj;
return vmFromString(((ParserConfigurationException) (obj)).toString());
obj;
return vmFromString(((IOException) (obj)).toString());
}
Is this odd syntax just an artifact of the reverse compile, or is there such a thing as meaningful code that follows a return statement?
Thanks,
Rebeccah

The code is just the exception handler loop customized to handle multiple exceptions - thus the multiple return statements. Its obviously not been translated correctly into Java.

How to disable pretty-printing in Groovy MarkupBuilder?

I have a string input in my Mule flow. It passes through my Groovy Script and outputs XML. I originaly had the script followed by an XSLT converter to remove empty nodes and set the indent to "no" in the output tag. But now I removed it as I cannot use it in conjunction with my script if I want to keep the special characters (see previous question here).
Instead I now check each value before printing the nodes. But the problem I have is my XML needs to be unindented in order to work with my InDesign project I adapt the XML for. I lost that ability when I removed the XSLT so I fixed one problem but created another.
I found the method getPrinter(), I used it with the setAutoIndent(false) but it didn't change anything to the output and created no errors. Not to sure where to use it.
Here's my script :
public Boolean isEmpty(value){
if(value.toString().trim() == "" || value.toString().trim() == '' || value == null)
return true;
}
root = new XmlSlurper(false,false).parseText(payload)
if(root.name() == 'GetActivitiesResponse')
startEach = root.children().children()
else
startEach = root.children()
def xml = new StringWriter().with { w -> new groovy.xml.MarkupBuilder(w).with {
mkp.xmlDeclaration(version: "1.0", encoding: "utf-8")
escapeAttributes = false
getPrinter().setAutoIndent(false);
"w_import_saisie_web"() {
startEach.each { p -> "w_evenement"() {
if(!isEmpty(p.PresentationDate))
"w_dates"{ mkp.yieldUnescaped (p.PresentationDate.toString() + "
") }
if(!isEmpty(p.SubTitle))
"w_contexte"{ mkp.yieldUnescaped (p.SubTitle.toString() + "
") }
//if(!isEmpty(p.SubTitle))
"w_nom_evenement"{ /*p.GEVT_Type*/ mkp.yieldUnescaped ("Nom evenement" + "
") }
if(!isEmpty(p.Name))
"w_titre"{ mkp.yieldUnescaped (p.Name.toString() + "
")}
if(!isEmpty(p.ShortDescription) || !isEmpty(p.Teaser))
"w_texte"{mkp.yieldUnescaped (p.ShortDescription.toString() + p.Teaser.toString() + "
")}
p.SubEvents.children().each { q -> "w_bloc_sous_evenement"() {
if(!isEmpty(q.PresentationDate) || !isEmpty(q.Name))
"w_sous_eve_titre"{ mkp.yieldUnescaped (q.PresentationDate.toString() + q.Name.toString() + "
")}
if(!isEmpty(q.ShortDescription) || !isEmpty(q.Teaser) || !isEmpty(q.WebDescription))
"w_sous_eve_desc"{mkp.yieldUnescaped (q.ShortDescription.toString() + q.Teaser.toString() + q.WebDescription.toString() + "
")}
}
}
if(!isEmpty(p.Site) || !isEmpty(p.PresentationHours))
"w_coordonnees"{ mkp.yieldUnescaped ("teeeessdfsdfsdfst" + p.Site.toString() + ' - ' + p.PresentationHours.toString() + "
")}
}
}
}
}
w.toString()
}

Add an IndentPrinter when you create the MarkupBuilder.
def xml = new MarkupBuilder(new IndentPrinter(new PrintWriter(writer), "", true))
See this question:
groovy.xml.MarkupBuilder disable PrettyPrint
I tried a bunch of different things to see if setAutoIndent was effective (setting it before passing the IndentPrinter to the MarkupBuilder for example) and it didn't seem to have any effect. So, like you, I'm wondering about its purpose.

Realised I was searching too hard... just added this simple line to the toString() at the end...
w.toString().replaceAll(">\\s+<", "><").trim();

Remove last element from SortedSet

for(RoomBookingDTO r : bb.getBooking().getRoomBookings()) {
if(r.getLocalId() == bb.getCurrentRoomNumber()) {
System.out.println("kom hit");
bb.getBooking().getRoomBookings().remove(r);
}
}
When I try to print the roomBookings set before and after the remove method is run, the set contains exactly the same elements. Thus, bb.getBooking().getRoomBookings().remove(r); does not work. I use java.util.SortedSet implemented as a java.util.TreeSet. Any suggestions to why this is not working?
RoomBookingDTO roomBooking = createRoomBooking(request);
System.out.println("Before: " + bb.getBooking().getRoomBookings());
bb.getBooking().getRoomBookings().add(roomBooking);
System.out.println("Add: " + bb.getBooking().getRoomBookings());
bb.getBooking().getRoomBookings().remove(roomBooking);
System.out.println("After: " + bb.getBooking().getRoomBookings());