CODEWITHSUNDEEP
javaproperties
Harshad Ranganathan
Harshad Ranganathan

Reputation: 1828

Conditionals in String - Java Properties File

Have a java property like below

sample.properties

query={name} in {address:-}

Currently using StrSubstitutor to replace the values 

 valuesMap.put("name", "Har");
 valuesMap.put("address", "Park Street");
 String queryString= properties.get("query");
 StrSubstitutor sub = new StrSubstitutor(valuesMap);
 String resolvedString = sub.replace(queryString);

resolvedString = Har in Park Street

What I need is that if the "address" isn't available, the resolved string should be as :

resolvedString = Har instead of resolvedString = Har in

Is it possible to achieve this using StrSubstitutor or by anyother means like using template engine?

Do not want any Java code dependency as the query pattern can change.

Upvotes: 0

Views: 1307

Answers (1)

Cristiano Zambon
Cristiano Zambon

Reputation: 466

This could be a way not to loose generality:

query1={name} in {address}
query2={name}
...
String queryString;
if (valueMap.get("address") == "") {
    queryString= properties.get("query2");
} else {
    queryString= properties.get("query1");
}
StrSubstitutor sub = new StrSubstitutor(valuesMap);
String resolvedString = sub.replace(queryString);

in this way even if in the future queries have to change, you'll be able to manage the difference between the two cases.

EDIT: if in the future you want to add new properties such in your comment: {name} as {alias} in {address}

I think a way to proceed could be to put even "as" and "in" into the query: query = {name} {as} {alias} {in} {address}

and the populate the database or the valueMap (don't know where the data come from in your application)) in the right way (so {as}="" when no "alias" and {in}="" when no address). Would that be feasible for you?

Upvotes: 1

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