/*
* Copyright 2016 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.util.internal;
import java.io.
ByteArrayOutputStream;
import java.io.
IOException;
import java.io.
PrintStream;
import java.util.
List;
public final class
ThrowableUtil {
private
ThrowableUtil() { }
/**
* Set the {@link StackTraceElement} for the given {@link Throwable}, using the {@link Class} and method name.
*/
public static <T extends
Throwable> 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
PlatformDependent.
javaVersion() >= 7;
}
@
SuppressJava6Requirement(reason = "Throwable addSuppressed is only available for >= 7. Has check for < 7.")
public static void
addSuppressed(
Throwable target,
Throwable suppressed) {
if (!
haveSuppressed()) {
return;
}
target.
addSuppressed(
suppressed);
}
public static void
addSuppressedAndClear(
Throwable target,
List<
Throwable>
suppressed) {
addSuppressed(
target,
suppressed);
suppressed.
clear();
}
public static void
addSuppressed(
Throwable target,
List<
Throwable>
suppressed) {
for (
Throwable t :
suppressed) {
addSuppressed(
target,
t);
}
}
}