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Improve documentation for SpEL property reference syntax 

See gh-25538
This commit is contained in:
Sam Brannen 2020-10-27 11:48:03 +01:00
parent 9c11887fe8
commit b01adadf60
1 changed files with 15 additions and 7 deletions
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22
src/docs/asciidoc/core/core-expressions.adoc
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@ -803,22 +803,30 @@ expressions:
.Java
----
// evals to 1856
int year = (Integer) parser.parseExpression("Birthdate.Year + 1900").getValue(context);
int year = (Integer) parser.parseExpression("birthdate.year + 1900").getValue(context);
String city = (String) parser.parseExpression("placeOfBirth.City").getValue(context);
String city = (String) parser.parseExpression("placeOfBirth.city").getValue(context);
----
[source,kotlin,indent=0,subs="verbatim,quotes",role="secondary"]
.Kotlin
----
// evals to 1856
val year = parser.parseExpression("Birthdate.Year + 1900").getValue(context) as Int
val year = parser.parseExpression("birthdate.year + 1900").getValue(context) as Int
val city = parser.parseExpression("placeOfBirth.City").getValue(context) as String
val city = parser.parseExpression("placeOfBirth.city").getValue(context) as String
----
Case insensitivity is allowed for the first letter of property names. The contents of
arrays and lists are obtained by using square bracket notation, as the following example
shows:
[NOTE]
====
Case insensitivity is allowed for the first letter of property names. Thus, the
expressions in the above example may be written as `Birthdate.Year + 1900` and
`PlaceOfBirth.City`, respectively. In addition, properties may optionally be accessed via
method invocations -- for example, `getPlaceOfBirth().getCity()` instead of
`placeOfBirth.city`.
====
The contents of arrays and lists are obtained by using square bracket notation, as the
following example shows:
[source,java,indent=0,subs="verbatim,quotes",role="primary"]
.Java