io.netty.util.internal.ThrowableUtil Maven / Gradle / Ivy
/*
* 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 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 suppressed) {
addSuppressed(target, suppressed);
suppressed.clear();
}
public static void addSuppressed(Throwable target, List suppressed) {
for (Throwable t : suppressed) {
addSuppressed(target, t);
}
}
}