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package org.openide.util;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.WeakHashMap;
import java.util.concurrent.Callable;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
/** Useful utility and methods to work with exceptions as
* described in detail in the NetBeans logging guide.
* Allows to annotate exceptions with messages, extract such messages
* and provides a common utility method to report an exception.
*
*
* @since 7.2
*/
public final class Exceptions extends Object {
private Exceptions() {
}
static final Logger LOG = Logger.getLogger(Exceptions.class.getName());
private static final String LOC_MSG_PLACEHOLDER = "msg"; // NOI18N
/** Attaches additional message to given exception. This message will
* be visible when one does e.printStackTrace().
*
* @param e exception to annotate
* @param msg the message to add to the exception
* @return the exception e
*/
public static E attachMessage(E e, String msg) {
AnnException ae = AnnException.findOrCreate(e, true);
LogRecord rec = new LogRecord(Level.ALL, msg);
ae.addRecord(rec);
return e;
}
/** Attaches additional localized message to given exception. This message
* can be extracted later by using {@link #findLocalizedMessage}.
*
* @param e exception to annotate
* @param localizedMessage the localized message to add to the exception
* @return the exception e
*/
public static E attachLocalizedMessage(E e, final String localizedMessage) {
AnnException ae = AnnException.findOrCreate(e, true);
LogRecord rec = new LogRecord(Level.ALL, LOC_MSG_PLACEHOLDER);
ResourceBundle rb = new ResourceBundle() {
public Object handleGetObject(String key) {
if (LOC_MSG_PLACEHOLDER.equals(key)) {
return localizedMessage;
} else {
return null;
}
}
public Enumeration getKeys() {
return Enumerations.singleton(LOC_MSG_PLACEHOLDER);
}
};
rec.setResourceBundle(rb);
ae.addRecord(rec);
return e;
}
/**
* Attaches a given severity to the exception. When the exception is
* later passed to {@link #printStackTrace} method, the level is
* then used as a level for reported {@link LogRecord}. This allows
* those who report exceptions to annotate them as unimportant,
* expected.
*
* @param e exception to assign severity to
* @param severity the severity
* @since 8.8
*/
public static E attachSeverity(E e, Level severity) {
AnnException ae = AnnException.findOrCreate(e, true);
ae.addRecord(new LogRecord(severity, null));
return e;
}
/** Extracts previously attached localized message for a given throwable.
* Complements {@link #attachLocalizedMessage}.
*
* @param t the exception to search for a message in
* @return localized message attached to provided exception or null
* if no such message has been attached
*/
public static String findLocalizedMessage(Throwable t) {
while (t != null) {
String msg;
AnnException extra = AnnException.extras.get(t);
if (extra != null) {
msg = extractLocalizedMessage(extra);
} else {
msg = extractLocalizedMessage(t);
}
if (msg != null) {
return msg;
}
t = t.getCause();
}
return null;
}
private static String extractLocalizedMessage(final Throwable t) {
String msg = null;
if (t instanceof Callable) {
Object res = null;
try {
res = ((Callable) t).call();
} catch (Exception ex) {
LOG.log(Level.WARNING, null, t); // NOI18N
}
if (res instanceof LogRecord[]) {
for (LogRecord r : (LogRecord[])res) {
ResourceBundle b = r.getResourceBundle();
if (b != null) {
msg = b.getString(r.getMessage());
break;
}
}
}
}
return msg;
}
/** Notifies an exception with a severe level. Such exception is going
* to be printed to log file and possibly also notified to alarm the
* user somehow.
*
* @param t the exception to notify
*/
public static void printStackTrace(Throwable t) {
AnnException ae = AnnException.findOrCreate(t, false);
Level level = null;
if (ae != null) {
for (LogRecord r : ae.records) {
if (r.getLevel() != Level.ALL) {
level = r.getLevel();
break;
}
}
}
if (level == null) {
level = OwnLevel.UNKNOWN;
}
AnnException extra = AnnException.extras.get(t);
if (extra != null) {
assert t == extra.getCause();
t = extra;
}
LOG.log(level, null, t);
}
/** An exception that has a log record associated with itself, so
* the NbErrorManager can extract info about the annotation.
*/
private static final class AnnException extends Exception implements Callable {
private List records;
private AnnException() {
super();
}
private AnnException(String msg) {
super(msg);
}
@Override
public String getMessage() {
StringBuilder sb = new StringBuilder();
String sep = "";
for (LogRecord r : records) {
String m = r.getMessage();
if (m != null && !m.equals(LOC_MSG_PLACEHOLDER)) {
sb.append(sep);
sb.append(m);
sep = "\n";
}
}
return sb.toString();
}
/** additional mapping from throwables that refuse initCause call */
private static Map extras = new WeakHashMap();
static AnnException findOrCreate(Throwable t, boolean create) {
AnnException ann;
try {
ann = findOrCreate0(t, create);
if (ann != null) {
return ann;
}
} catch (IllegalStateException ex) {
assert create;
ann = extras.get(t);
if (ann == null) {
ann = new AnnException(t.getMessage());
ann.initCause(t);
LOG.log(Level.FINE, "getCause was null yet initCause failed for " + t, ex);
extras.put(t, ann);
}
}
return ann;
}
private static AnnException findOrCreate0(Throwable t, boolean create) {
if (t instanceof AnnException) {
return (AnnException) t;
}
if (t.getCause() == null) {
if (create) {
final AnnException ae = new AnnException();
t.initCause(ae);
if (ae != t.getCause()) {
throw new IllegalStateException();
}
}
return (AnnException) t.getCause();
}
return findOrCreate0(t.getCause(), create);
}
public synchronized void addRecord(LogRecord rec) {
if (records == null) {
records = new ArrayList();
}
records.add(rec);
}
public LogRecord[] call() {
List r = records;
LogRecord[] empty = new LogRecord[0];
return r == null ? empty : r.toArray(empty);
}
@Override
public void printStackTrace(PrintStream s) {
super.printStackTrace(s);
logRecords(s);
}
@Override
public void printStackTrace(PrintWriter s) {
super.printStackTrace(s);
logRecords(s);
}
@Override
public Throwable fillInStackTrace() {
return this;
}
@Override
public String toString() {
return getMessage();
}
private void logRecords(Appendable a) {
List r = records;
if (r == null) {
return;
}
try {
for (LogRecord log : r) {
if (log.getMessage() != null) {
a.append(log.getMessage()).append("\n");;
}
if (log.getThrown() != null) {
StringWriter w = new StringWriter();
log.getThrown().printStackTrace(new PrintWriter(w));
a.append(w.toString()).append("\n");
}
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
} // end AnnException
private static final class OwnLevel extends Level {
public static final Level UNKNOWN = new OwnLevel("SEVERE", Level.SEVERE.intValue() + 1); // NOI18N
private OwnLevel(String s, int i) {
super(s, i);
}
} // end of OwnLevel
}
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