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/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.app;
import java.lang.StackWalker.StackFrame;
import java.lang.module.ModuleDescriptor;
import java.util.Objects;
public class Utils {
public static void verify(Class<?> caller, String loaderName,
String methodname, String filename) {
StackTraceElement[] stes = Thread.currentThread().getStackTrace();
StackWalker.StackFrame[] frames = new StackFrame[] {
makeStackFrame(Utils.class, "verify", "Utils.java"),
makeStackFrame(caller, methodname, filename)
};
checkFrame("app", frames[0], stes[1]);
checkFrame(loaderName, frames[1], stes[2]);
}
public static StackFrame makeStackFrame(Class<?> c, String methodname, String filename) {
return new StackFrame() {
@Override
public String getClassName() {
return c.getName();
}
@Override
public String getMethodName() {
return methodname;
}
@Override
public Class<?> getDeclaringClass() {
return c;
}
@Override
public int getByteCodeIndex() {
return 0;
}
@Override
public String getFileName() {
return filename;
}
@Override
public int getLineNumber() {
return 0;
}
@Override
public boolean isNativeMethod() {
return false;
}
@Override
public StackTraceElement toStackTraceElement() {
return null;
}
private String getClassLoaderName(Class<?> c) {
ClassLoader loader = c.getClassLoader();
String name = "";
if (loader == null) {
name = "boot";
} else if (loader.getName() != null) {
name = loader.getName();
}
return name;
}
@Override
public String toString() {
String mid = getClassLoaderName(c);
Module module = c.getModule();
if (module.isNamed()) {
ModuleDescriptor md = module.getDescriptor();
mid = md.name();
if (md.version().isPresent())
mid += "@" + md.version().get().toString();
mid += "/";
}
String fileName = getFileName();
int lineNumber = getLineNumber();
String sourceinfo = "Unknown Source";
if (isNativeMethod()) {
sourceinfo = "Native Method";
} else if (fileName != null && lineNumber >= 0) {
sourceinfo = fileName + ":" + lineNumber;
}
return String.format("%s/%s.%s(%s)", mid, getClassName(), getMethodName(),
sourceinfo);
}
};
}
public static void checkFrame(String loaderName, StackFrame frame,
StackTraceElement ste) {
System.err.println("checking " + ste.toString() + " expected: " + frame.toString());
Class<?> c = frame.getDeclaringClass();
Module module = c.getModule();
assertEquals(ste.getModuleName(), module.getName(), "module name");
assertEquals(ste.getClassLoaderName(), loaderName, "class loader name");
assertEquals(ste.getClassLoaderName(), c.getClassLoader().getName(),
"class loader name");
assertEquals(ste.getClassName(), c.getName(), "class name");
assertEquals(ste.getMethodName(), frame.getMethodName(), "method name");
assertEquals(ste.getFileName(), frame.getFileName(), "file name");
}
private static void assertEquals(String actual, String expected, String msg) {
if (!Objects.equals(actual, expected))
throw new AssertionError("Actual: " + actual + " Excepted: " +
expected + " mismatched " + msg);
}
}
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