com.firefly.net.tcp.secure.openssl.nativelib.ThrowableUtil Maven / Gradle / Ivy
package com.firefly.net.tcp.secure.openssl.nativelib;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
public final class ThrowableUtil {
private static final Method addSupressedMethod = getAddSuppressed();
private static Method getAddSuppressed() {
if (PlatformDependent.javaVersion() < 7) {
return null;
}
try {
// addSuppressed is final, so we only need to look it up on Throwable.
return Throwable.class.getDeclaredMethod("addSuppressed", Throwable.class);
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
private ThrowableUtil() { }
/**
* Set the {@link StackTraceElement} for the given {@link Throwable}, using the {@link Class} and method name.
*/
public static T unknownStackTrace(T cause, Class clazz, String method) {
cause.setStackTrace(new StackTraceElement[] { new StackTraceElement(clazz.getName(), method, null, -1)});
return cause;
}
/**
* Gets the stack trace from a Throwable as a String.
*
* @param cause the {@link Throwable} to be examined
* @return the stack trace as generated by {@link Throwable#printStackTrace(java.io.PrintWriter)} method.
*/
public static String stackTraceToString(Throwable cause) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
PrintStream pout = new PrintStream(out);
cause.printStackTrace(pout);
pout.flush();
try {
return new String(out.toByteArray());
} finally {
try {
out.close();
} catch (IOException ignore) {
// ignore as should never happen
}
}
}
public static boolean haveSuppressed() {
return addSupressedMethod != null;
}
public static void addSuppressed(Throwable target, Throwable suppressed) {
if (!haveSuppressed()) {
return;
}
try {
addSupressedMethod.invoke(target, suppressed);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
public static void addSuppressedAndClear(Throwable target, List suppressed) {
addSuppressed(target, suppressed);
suppressed.clear();
}
public static void addSuppressed(Throwable target, List suppressed) {
for (Throwable t : suppressed) {
addSuppressed(target, t);
}
}
}