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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.yolean;
/**
* Helper methods for handling exceptions
*
* @author bratseth
*/
public class Exceptions {
/**
* <p>Returns a user friendly error message string which includes information from all nested exceptions.</p>
*
* <p>The form of this string is
* <code>e.getMessage(): e.getCause().getMessage(): e.getCause().getCause().getMessage()...</code>
* In addition, some heuristics are used to clean up common cases where exception nesting causes bad messages.
*/
public static String toMessageString(Throwable t) {
StringBuilder b = new StringBuilder();
String lastMessage = null;
String message;
for (; t != null; t = t.getCause()) {
message = getMessage(t);
if (message == null) continue;
if (message.equals(lastMessage)) continue;
if (b.length() > 0) {
b.append(": ");
}
b.append(message);
lastMessage = message;
}
return b.toString();
}
/** Returns a useful message from *this* exception, or null if there is nothing useful to return */
private static String getMessage(Throwable t) {
String message = t.getMessage();
if (t.getCause() == null) {
if (message == null) return t.getClass().getSimpleName();
} else {
if (message == null) return null;
if (message.equals(t.getCause().getClass().getName() + ": " + t.getCause().getMessage())) return null;
}
return message;
}
}
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