root
/
spring-framework
mirror of https://github.com/spring-projects/spring-framework.git
1
0
Fork 0
Code Issues Actions 6 Packages Projects Releases Wiki Activity

Polish documentation for SpEL Elvis operator

This commit is contained in:
Sam Brannen 2025-03-12 14:48:34 +01:00
parent c7b0550e43
commit 1780e30a43
1 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
framework-docs/modules/ROOT/pages/core/expressions/language-ref/operator-elvis.adoc
View File

@ -1,10 +1,10 @@
[[expressions-operator-elvis]]
= The Elvis Operator
The Elvis operator is a shortening of the ternary operator syntax and is used in the
https://www.groovy-lang.org/operators.html#_elvis_operator[Groovy] language. With the
ternary operator syntax, you often have to repeat a variable twice, as the following
Java example shows:
The Elvis operator (`?:`) is a shortening of the ternary operator syntax and is used in
the https://www.groovy-lang.org/operators.html#_elvis_operator[Groovy] language. With the
ternary operator syntax, you often have to repeat a variable twice, as the following Java
example shows:
[source,java,indent=0,subs="verbatim,quotes"]
----
@ -23,7 +23,7 @@ Java::
----
ExpressionParser parser = new SpelExpressionParser();
String name = parser.parseExpression("name?:'Unknown'").getValue(new Inventor(), String.class);
String name = parser.parseExpression("name ?: 'Unknown'").getValue(new Inventor(), String.class);
System.out.println(name); // 'Unknown'
----
@ -33,7 +33,7 @@ Kotlin::
----
val parser = SpelExpressionParser()
val name = parser.parseExpression("name?:'Unknown'").getValue(Inventor(), String::class.java)
val name = parser.parseExpression("name ?: 'Unknown'").getValue(Inventor(), String::class.java)
println(name) // 'Unknown'
----
======
@ -58,11 +58,11 @@ Java::
EvaluationContext context = SimpleEvaluationContext.forReadOnlyDataBinding().build();
Inventor tesla = new Inventor("Nikola Tesla", "Serbian");
String name = parser.parseExpression("name?:'Elvis Presley'").getValue(context, tesla, String.class);
String name = parser.parseExpression("name ?: 'Elvis Presley'").getValue(context, tesla, String.class);
System.out.println(name); // Nikola Tesla
tesla.setName("");
name = parser.parseExpression("name?:'Elvis Presley'").getValue(context, tesla, String.class);
name = parser.parseExpression("name ?: 'Elvis Presley'").getValue(context, tesla, String.class);
System.out.println(name); // Elvis Presley
----
@ -74,11 +74,11 @@ Kotlin::
val context = SimpleEvaluationContext.forReadOnlyDataBinding().build()
val tesla = Inventor("Nikola Tesla", "Serbian")
var name = parser.parseExpression("name?:'Elvis Presley'").getValue(context, tesla, String::class.java)
var name = parser.parseExpression("name ?: 'Elvis Presley'").getValue(context, tesla, String::class.java)
println(name) // Nikola Tesla
tesla.setName("")
name = parser.parseExpression("name?:'Elvis Presley'").getValue(context, tesla, String::class.java)
name = parser.parseExpression("name ?: 'Elvis Presley'").getValue(context, tesla, String::class.java)
println(name) // Elvis Presley
----
======