private static String collapseText(
Throwable t, boolean includeAllCausalMessages, Set<Throwable> visited) {
if (t == null) return null;
if (visited.contains(t)) {
// IllegalStateException sometimes refers to itself; guard against stack overflows
if (Strings.isNonBlank(t.getMessage())) return t.getMessage();
else return "(" + t.getClass().getName() + ", recursive cause)";
}
Throwable t2 = collapse(t, true, includeAllCausalMessages, visited);
visited = MutableSet.copyOf(visited);
visited.add(t);
visited.add(t2);
if (t2 instanceof PropagatedRuntimeException) {
if (((PropagatedRuntimeException) t2).isCauseEmbeddedInMessage())
// normally
return t2.getMessage();
else if (t2.getCause() != null)
return collapseText(t2.getCause(), includeAllCausalMessages, ImmutableSet.copyOf(visited));
return "" + t2.getClass();
}
String result = t2.toString();
if (!includeAllCausalMessages) {
return result;
}
Throwable cause = t2.getCause();
if (cause != null) {
String causeResult = collapseText(new PropagatedRuntimeException(cause));
if (result.indexOf(causeResult) >= 0) return result;
return result + "; caused by " + causeResult;
}
return result;
}
private static Throwable collapse(
Throwable source,
boolean collapseCausalChain,
boolean includeAllCausalMessages,
Set<Throwable> visited) {
visited = MutableSet.copyOf(visited);
String message = "";
Throwable collapsed = source;
int collapseCount = 0;
boolean messageIsFinal = false;
// remove boring stack traces at the head
while (isBoring(collapsed) && !messageIsFinal) {
collapseCount++;
Throwable cause = collapsed.getCause();
if (cause == null) {
// everything in the tree is boring...
return source;
}
if (visited.add(collapsed)) {
// there is a recursive loop
break;
}
String collapsedS = collapsed.getMessage();
if (collapsed instanceof PropagatedRuntimeException
&& ((PropagatedRuntimeException) collapsed).isCauseEmbeddedInMessage()) {
message = collapsed.getMessage();
messageIsFinal = true;
} else if (Strings.isNonBlank(collapsedS)) {
collapsedS =
Strings.removeAllFromEnd(
collapsedS,
cause.toString(),
stripBoringPrefixes(cause.toString()),
cause.getMessage());
collapsedS = stripBoringPrefixes(collapsedS);
if (Strings.isNonBlank(collapsedS)) message = appendSeparator(message, collapsedS);
}
collapsed = cause;
}
// if no messages so far (ie we will be the toString) then remove boring prefixes from the
// message
Throwable messagesCause = collapsed;
while (messagesCause != null && isPrefixBoring(messagesCause) && Strings.isBlank(message)) {
collapseCount++;
if (Strings.isNonBlank(messagesCause.getMessage())) {
message = messagesCause.getMessage();
messagesCause = messagesCause.getCause();
break;
}
visited.add(messagesCause);
messagesCause = messagesCause.getCause();
}
if (collapseCount == 0 && !includeAllCausalMessages) return source;
if (collapseCount == 0 && messagesCause != null) {
message = messagesCause.toString();
messagesCause = messagesCause.getCause();
}
if (messagesCause != null && !messageIsFinal) {
String extraMessage =
collapseText(messagesCause, includeAllCausalMessages, ImmutableSet.copyOf(visited));
message = appendSeparator(message, extraMessage);
}
if (message == null) message = "";
return new PropagatedRuntimeException(message, collapseCausalChain ? collapsed : source, true);
}
private void assertEqualsIgnoringOrder(
Iterable<? extends Object> col1, Iterable<? extends Object> col2) {
assertEquals(Iterables.size(col1), Iterables.size(col2), "col2=" + col1 + "; col2=" + col2);
assertEquals(
MutableSet.copyOf(col1), MutableSet.copyOf(col2), "col1=" + col1 + "; col2=" + col2);
}
