darkma773r commented on code in PR #181:
URL:
https://github.com/apache/commons-configuration/pull/181#discussion_r874327321
##########
src/main/java/org/apache/commons/configuration2/interpol/ConfigurationInterpolator.java:
##########
@@ -281,13 +301,34 @@ public ConfigurationInterpolator getParentInterpolator() {
* @return the {@code StringSubstitutor} used by this object
*/
private StringSubstitutor initSubstitutor() {
- return new StringSubstitutor(key -> Objects.toString(resolve(key),
null));
+ return new StringSubstitutor(key -> {
+ final Object value = resolve(key);
+ return value != null
+ ? stringConverter.apply(value)
+ : null;
+ });
}
/**
- * Performs interpolation of the passed in value. If the value is of type
String, this method checks whether it contains
- * variables. If so, all variables are replaced by their current values
(if possible). For non string arguments, the
- * value is returned without changes.
+ * Performs interpolation of the passed in value. If the value is of type
{@code String}, this method checks
+ * whether it contains variables. If so, all variables are replaced by
their current values (if possible). For
+ * non string arguments, the value is returned without changes. In the
special case where the value is a string
+ * consisting of a single variable reference, the interpolated variable
value is <em>not</em> converted to a
+ * string before returning, so that callers can access the raw value.
However, if the variable is part of a larger
+ * interpolated string, then the variable value is converted to a string
using the configured
+ * {@link #getStringConverter() string converter}. (See the discussion on
string conversion in the class
+ * documentation for more details.)
+ *
+ * <p><strong>Examples</strong></p>
+ * <p>
+ * For the following examples, assume that the default string conversion
function is in place and that the
+ * variable {@code i} maps to the integer value {@code 42}.
+ * <pre>
+ * interpolator.interpolate(1) -> 1// non-string argument returned
unchanged
Review Comment:
Ha! That is awesome and the exact thing I need here. Thanks!
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