jeantil commented on a change in pull request #479:
URL: https://github.com/apache/james-project/pull/479#discussion_r647344522
##########
File path:
server/data/data-jmap/src/main/java/org/apache/james/jmap/api/model/Preview.java
##########
@@ -88,15 +89,30 @@ public static Preview from(String value) {
}
public static Preview compute(String textBody) {
+ int previewOffsetEstimate = estimatePreviewOffset(textBody,
MAX_LENGTH);
+ String previewPart = textBody.substring(0, previewOffsetEstimate);
return Preview.from(
truncateToMaxLength(
- StringUtils.normalizeSpace(textBody)));
+ StringUtils.normalizeSpace(previewPart)));
}
private static String truncateToMaxLength(String body) {
return StringUtils.left(body, MAX_LENGTH);
}
+ private static int estimatePreviewOffset(String body, int charCount) {
+ AtomicInteger position = new AtomicInteger(0);
+
+ body.chars()
+ .mapToObj(i -> (char) i)
Review comment:
I'm all for stream processing but this code
- auto-boxes to Character through an explicit cast
- then auto-unboxes it back to int (see isLetterOrDigit)
- forces you to use an atomic integer to work around lambda restrictions
- forces you to declare the useless forEach to trigger stream evaluation
(untested) loop version
```java
private static int estimatePreviewOffset(String body, int charCount) {
int position = 0;
int nonWhitespace = 0;
int maxPosition = Math.min(charCount, body.length() - 1);
while (nonWhitespace <= maxPosition) {
position++;
if (Character.isLetterOrDigit(body.charAt(position))) {
charCount++;
}
}
return position;
}
```
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