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Fix SpEL collection selection/projection examples in reference manual

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This commit also updates and polishes the documentation tests.
This commit is contained in:
Sam Brannen
2024-02-07 18:40:07 +01:00
parent 43bbe8f3e8
commit 78c96b6d78
3 changed files with 59 additions and 44 deletions
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10
framework-docs/modules/ROOT/pages/core/expressions/language-ref/collection-projection.adoc
View File

@@ -13,16 +13,18 @@ Java::
+
[source,java,indent=0,subs="verbatim,quotes",role="primary"]
----
// returns ['Smiljan', 'Idvor' ]
List placesOfBirth = (List)parser.parseExpression("members.![placeOfBirth.city]");
// evaluates to ["SmilJan", "Idvor"]
List placesOfBirth = parser.parseExpression("members.![placeOfBirth.city]")
.getValue(societyContext, List.class);
----
Kotlin::
+
[source,kotlin,indent=0,subs="verbatim,quotes",role="secondary"]
----
// returns ['Smiljan', 'Idvor' ]
val placesOfBirth = parser.parseExpression("members.![placeOfBirth.city]") as List<*>
// evaluates to ["SmilJan", "Idvor"]
val placesOfBirth = parser.parseExpression("members.![placeOfBirth.city]")
.getValue(societyContext) as List<*>
----
======

23
framework-docs/modules/ROOT/pages/core/expressions/language-ref/collection-selection.adoc
View File

@@ -28,13 +28,14 @@ Kotlin::
======
Selection is supported for arrays and anything that implements `java.lang.Iterable` or
`java.util.Map`. For a list or array, the selection criteria is evaluated against each
individual element. Against a map, the selection criteria is evaluated against each map
entry (objects of the Java type `Map.Entry`). Each map entry has its `key` and `value`
accessible as properties for use in the selection.
`java.util.Map`. For an array or `Iterable`, the selection expression is evaluated
against each individual element. Against a map, the selection expression is evaluated
against each map entry (objects of the Java type `Map.Entry`). Each map entry has its
`key` and `value` accessible as properties for use in the selection.
The following expression returns a new map that consists of those elements of the
original map where the entry's value is less than 27:
Given a `Map` stored in a variable named `#map`, the following expression returns a new
map that consists of those elements of the original map where the entry's value is less
than 27:
[tabs]
======
@@ -42,21 +43,21 @@ Java::
+
[source,java,indent=0,subs="verbatim,quotes",role="primary"]
----
Map newMap = parser.parseExpression("map.?[value<27]").getValue();
Map newMap = parser.parseExpression("#map.?[value < 27]").getValue(Map.class);
----
Kotlin::
+
[source,kotlin,indent=0,subs="verbatim,quotes",role="secondary"]
----
val newMap = parser.parseExpression("map.?[value<27]").getValue()
val newMap = parser.parseExpression("#map.?[value < 27]").getValue() as Map
----
======
In addition to returning all the selected elements, you can retrieve only the first or
the last element. To obtain the first element matching the selection, the syntax is
`.^[selectionExpression]`. To obtain the last matching selection, the syntax is
`.$[selectionExpression]`.
the last element. To obtain the first element matching the selection expression, the
syntax is `.^[selectionExpression]`. To obtain the last element matching the selection
expression, the syntax is `.$[selectionExpression]`.