codeconsole commented on code in PR #15732:
URL: https://github.com/apache/grails-core/pull/15732#discussion_r3417021921
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grails-web-core/src/main/groovy/org/grails/web/servlet/HttpServletRequestExtension.groovy:
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@@ -251,4 +252,26 @@ class HttpServletRequestExtension {
static Date date(HttpServletRequest request, String name,
Collection<String> formats) {
TypeConverters.toDate(request.getAttribute(name), formats)
}
+ /**
+ * Null-safe, typed read of an attribute. Returns the attribute when it is
an
+ * instance of {@code type}; otherwise {@code null}. No coercion is
attempted —
+ * use the named converters ({@code string}, {@code int}, ...) for type
conversion.
+ */
+ static <T> T getAttribute(HttpServletRequest request, String name,
Class<T> type) {
+ if (type == null) {
+ throw new IllegalArgumentException('type must not be null - use
getAttribute(name) for an untyped read')
+ }
+ Object value = request.getAttribute(name)
+ Class<T> resolvedType = (Class<T>)
ClassUtils.resolvePrimitiveIfNecessary(type)
+ resolvedType.isInstance(value) ? resolvedType.cast(value) : null
Review Comment:
@jdaugherty I added a test example
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