pax_global_header 0000666 0000000 0000000 00000000064 13731553066 0014523 g ustar 00root root 0000000 0000000 52 comment=a7d96a20d34ec42900d741d0f1187ffdd3c90958
backport9-1.10/ 0000775 0000000 0000000 00000000000 13731553066 0013342 5 ustar 00root root 0000000 0000000 backport9-1.10/LICENSE 0000664 0000000 0000000 00000026136 13731553066 0014357 0 ustar 00root root 0000000 0000000
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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backport9-1.10/README.md 0000664 0000000 0000000 00000000750 13731553066 0014623 0 ustar 00root root 0000000 0000000 Backport9
=========
A collection of backports and utilities to support libraries and apps that
want to use Java 9 features but still function on Java 8.
Modules
-------
A light shim library that wraps Java 9 and previous reflection APIs to allow a
uniform API into "module"-like behaviors on all recent JDKs.
Buffers
-------
Binary-compatible calling shims for java.nio.Buffer and subclasses.
Stack
-----
A look-alike wrapper around the Java 9 StackWalker API with Java 8 support.
backport9-1.10/pom.xml 0000664 0000000 0000000 00000004041 13731553066 0014656 0 ustar 00root root 0000000 0000000
4.0.0com.headiusbackport91.10org.sonatype.ossoss-parent7The Apache Software License, Version 2.0http://www.apache.org/licenses/LICENSE-2.0.txtreposcm:git:https://github.com/headius/backport9.gitscm:git:git@github.com:headius/backport9.githttps://github.com/headius/backport9headiusCharles Nutterheadius@headius.comjunitjunit4.12testmaven-compiler-plugin3.7.01.81.8maven-javadoc-plugin3.0.18
backport9-1.10/src/ 0000775 0000000 0000000 00000000000 13731553066 0014131 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/ 0000775 0000000 0000000 00000000000 13731553066 0015055 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/ 0000775 0000000 0000000 00000000000 13731553066 0015776 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/ 0000775 0000000 0000000 00000000000 13731553066 0016554 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/headius/ 0000775 0000000 0000000 00000000000 13731553066 0020176 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/headius/backport9/ 0000775 0000000 0000000 00000000000 13731553066 0022074 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/headius/backport9/buffer/ 0000775 0000000 0000000 00000000000 13731553066 0023345 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/headius/backport9/buffer/Buffers.java 0000664 0000000 0000000 00000005333 13731553066 0025610 0 ustar 00root root 0000000 0000000 package com.headius.backport9.buffer;
import java.nio.Buffer;
/**
* Utility functions to help avoid binary incompatibility due to variadic return types on Java 9.
*
* Java 9 introduced new overloads of several Buffer methods on its subclasses. Because those methods
* return the actual type of the subclass, they are incompatible with Java 8 where no such overloads
* exist. This utility casts all buffers to Buffer and makes the call from there, avoiding binding
* directly to the overloads that don't exist on Java 8.
*/
public class Buffers {
/**
* Invoke Buffer.clear always using Buffer as the target, to avoid binary incompatibility on Java 8.
*
* @param buf the buffer
* @param any java.nio.Buffer type
* @return the buffer
* @see Buffer#clear()
*/
public static T clearBuffer(T buf) {
return (T) buf.clear();
}
/**
* Invoke Buffer.flip always using Buffer as the target, to avoid binary incompatibility on Java 8.
*
* @param buf the buffer
* @param any java.nio.Buffer type
* @return the buffer
* @see Buffer#flip()
*/
public static T flipBuffer(T buf) {
return (T) buf.flip();
}
/**
* Invoke Buffer.limit always using Buffer as the target, to avoid binary incompatibility on Java 8.
*
* @param buf the buffer
* @param limit the new limit
* @param any java.nio.Buffer type
* @return the buffer
* @see Buffer#limit(int)
*/
public static T limitBuffer(T buf, int limit) {
return (T) buf.limit(limit);
}
/**
* Invoke Buffer.position always using Buffer as the target, to avoid binary incompatibility on Java 8.
*
* @param buf the buffer
* @param limit the new limit
* @param any java.nio.Buffer type
* @return the buffer
* @see Buffer#position()
*/
public static T positionBuffer(T buf, int limit) {
return (T) buf.position(limit);
}
/**
* Invoke Buffer.mark always using Buffer as the target, to avoid binary incompatibility on Java 8.
*
* @param buf the buffer
* @param any java.nio.Buffer type
* @return the buffer
* @see Buffer#mark()
*/
public static T markBuffer(T buf) {
return (T) buf.mark();
}
/**
* Invoke Buffer.rewind always using Buffer as the target, to avoid binary incompatibility on Java 8.
*
* @param buf the buffer
* @param any java.nio.Buffer type
* @return the buffer
* @see Buffer#rewind()
*/
public static T rewindBuffer(T buf) {
return (T) buf.rewind();
}
}
backport9-1.10/src/main/java/com/headius/backport9/modules/ 0000775 0000000 0000000 00000000000 13731553066 0023544 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/headius/backport9/modules/Module.java 0000664 0000000 0000000 00000000537 13731553066 0025641 0 ustar 00root root 0000000 0000000 package com.headius.backport9.modules;
import java.lang.reflect.Method;
public interface Module {
boolean isOpen(String pn);
boolean isOpen(String pn, Module other);
boolean isExported(String pn);
boolean isExported(String pn, Module other);
boolean isNamed();
void addOpens(String pn, Module other);
String getName();
}
backport9-1.10/src/main/java/com/headius/backport9/modules/Modules.java 0000664 0000000 0000000 00000007614 13731553066 0026027 0 ustar 00root root 0000000 0000000 package com.headius.backport9.modules;
import com.headius.backport9.modules.impl.Module9;
import com.headius.backport9.modules.impl.ModuleDummy;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Member;
/**
* Created by headius on 10/18/17.
*/
public class Modules {
public static Module getModule(Class cls) {
if (JAVA_NINE) {
return new Module9(cls.getModule());
}
return new ModuleDummy();
}
public static void addOpens​(Class ownerClass, String pn, Class otherClass) {
getModule(ownerClass).addOpens(pn, getModule(otherClass));
}
public static boolean trySetAccessible(T accessibleMember) {
return trySetAccessible(accessibleMember.getDeclaringClass(), accessibleMember, null);
}
public static boolean trySetAccessible(T accessibleMember, Class modClass) {
return trySetAccessible(accessibleMember.getDeclaringClass(), accessibleMember, modClass);
}
public static boolean isOpen(Class target, Class caller) {
return getModule(target).isOpen(getPackageName(target), getModule(caller));
}
public static boolean isExported(Class target, Class caller) {
return getModule(target).isExported(getPackageName(target), getModule(caller));
}
public static boolean isAccessible(M member, Class modClass) {
return isAccessible0(member, modClass);
}
private static boolean isAccessible0(M member, Class modClass) {
if (!JAVA_NINE) {
return member.isAccessible();
}
return isOpen(member.getDeclaringClass(), modClass);
}
private static boolean trySetAccessible(Class declaringClass, AccessibleObject accessibleObject, Class modClass) {
if (!JAVA_NINE) {
accessibleObject.setAccessible(true);
return true;
}
java.lang.Module module = declaringClass.getModule();
return modClass == null ?
trySetAccessible(module, declaringClass, accessibleObject) :
trySetAccessible(module, declaringClass, accessibleObject, modClass.getModule());
}
private static boolean trySetAccessible(final java.lang.Module module, Class declaringClass, AccessibleObject accessibleObject) {
try {
String packageName = getPackageName(declaringClass);
if (module.isOpen(packageName)) {
accessibleObject.setAccessible(true);
return true;
}
return false;
} catch (Exception e) {
return false;
}
}
private static boolean trySetAccessible(final java.lang.Module module, Class declaringClass, AccessibleObject accessibleObject, final java.lang.Module other) {
try {
String packageName = getPackageName(declaringClass);
if (module.isOpen(packageName, other)) {
if (!other.isNamed()) {
// JDK internals always appear open to unnamed, so we must make it explicit
module.addOpens(packageName, other);
}
accessibleObject.setAccessible(true);
return true;
}
return false;
} catch (Exception e) {
return false;
}
}
private static String getPackageName(final Class klass) {
Package pkg = klass.getPackage(); // default package is null on Java 8, returns (unnamed) package object on 11
return pkg == null ? "" : pkg.getName();
}
private static final boolean JAVA_NINE;
static {
boolean j9;
try {
Class.forName("java.lang.Module");
j9 = true;
} catch (Exception e) {
j9 = false;
}
JAVA_NINE = j9;
}
}
backport9-1.10/src/main/java/com/headius/backport9/modules/impl/ 0000775 0000000 0000000 00000000000 13731553066 0024505 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/headius/backport9/modules/impl/Module9.java 0000664 0000000 0000000 00000002026 13731553066 0026666 0 ustar 00root root 0000000 0000000 package com.headius.backport9.modules.impl;
import com.headius.backport9.modules.Module;
/**
* Created by headius on 10/18/17.
*/
public class Module9 implements Module {
private final java.lang.Module module;
public Module9(java.lang.Module module) {
this.module = module;
}
public boolean isOpen(String pn) {
return module.isOpen(pn);
}
public boolean isOpen(String pn, Module other) {
return module.isOpen(pn, ((Module9) other).module);
}
public boolean isExported(String pn) {
return module.isExported(pn);
}
public boolean isExported(String pn, Module other) {
return module.isExported(pn, ((Module9) other).module);
}
public void addOpens(String pn, Module other) {
module.addOpens(pn, ((Module9) other).module);
}
public boolean isNamed() {
return module.isNamed();
}
public String toString() {
return module.toString();
}
public String getName() {
return module.getName();
}
}
backport9-1.10/src/main/java/com/headius/backport9/modules/impl/ModuleDummy.java 0000664 0000000 0000000 00000001355 13731553066 0027615 0 ustar 00root root 0000000 0000000 package com.headius.backport9.modules.impl;
import com.headius.backport9.modules.Module;
/**
* Created by headius on 10/18/17.
*/
public class ModuleDummy implements Module {
public boolean isOpen(String pn) {
return true;
}
public boolean isOpen(String pn, Module other) {
return isOpen(pn);
}
public boolean isExported(String pn) {
return true;
}
public boolean isExported(String pn, Module other) {
return true;
}
public void addOpens(String pn, Module other) {
return;
}
public boolean isNamed() {
return false;
}
public String toString() {
return "no module";
}
public String getName() {
return null;
}
}
backport9-1.10/src/main/java/com/headius/backport9/platform/ 0000775 0000000 0000000 00000000000 13731553066 0023720 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/headius/backport9/platform/Detect.java 0000664 0000000 0000000 00000000502 13731553066 0025770 0 ustar 00root root 0000000 0000000 package com.headius.backport9.platform;
public class Detect {
public static final boolean JAVA_NINE;
static {
boolean j9;
try {
Class.forName("java.lang.Module");
j9 = true;
} catch (Exception e) {
j9 = false;
}
JAVA_NINE = j9;
}
}
backport9-1.10/src/main/java/com/headius/backport9/stack/ 0000775 0000000 0000000 00000000000 13731553066 0023201 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/headius/backport9/stack/StackWalker.java 0000664 0000000 0000000 00000002046 13731553066 0026261 0 ustar 00root root 0000000 0000000 package com.headius.backport9.stack;
import com.headius.backport9.platform.Detect;
import com.headius.backport9.stack.impl.StackWalker8;
import com.headius.backport9.stack.impl.StackWalker9;
import java.util.function.Function;
import java.util.stream.Stream;
public interface StackWalker {
static StackWalker getInstance() {
if (Detect.JAVA_NINE) {
return new StackWalker9();
} else {
return new StackWalker8();
}
}
T walk(Function, ? extends T> function);
default T walk(StackTraceElement[] trace, Function, ? extends T> function) {
return StackWalker8.walkElements(trace, 0, trace.length, function);
}
interface StackFrame {
String getClassName();
String getMethodName();
Class getDeclaringClass();
int getByteCodeIndex();
String getFileName();
int getLineNumber();
boolean isNativeMethod();
StackTraceElement toStackTraceElement();
}
}
backport9-1.10/src/main/java/com/headius/backport9/stack/impl/ 0000775 0000000 0000000 00000000000 13731553066 0024142 5 ustar 00root root 0000000 0000000 backport9-1.10/src/main/java/com/headius/backport9/stack/impl/StackWalker8.java 0000664 0000000 0000000 00000003762 13731553066 0027320 0 ustar 00root root 0000000 0000000 package com.headius.backport9.stack.impl;
import com.headius.backport9.stack.StackWalker;
import java.util.Arrays;
import java.util.function.Function;
import java.util.stream.Stream;
public class StackWalker8 implements StackWalker {
public StackWalker8() {
}
@Override
public T walk(Function, ? extends T> function) {
StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
// start at 1 to remove this frame from the walk
return walkElements(stackTrace, Math.min(1, stackTrace.length), stackTrace.length, function);
}
public static T walkElements(StackTraceElement[] trace, int startInclusive, int endExclusive, Function, ? extends T> function) {
Stream stream = Arrays.stream(trace, startInclusive, endExclusive).map(element -> new StackFrame8(element));
return function.apply(stream);
}
public static class StackFrame8 implements StackFrame {
final StackTraceElement element;
public StackFrame8(StackTraceElement element) {
this.element = element;
}
@Override
public String getClassName() {
return element.getClassName();
}
@Override
public String getMethodName() {
return element.getMethodName();
}
@Override
public Class getDeclaringClass() {
return null;
}
@Override
public int getByteCodeIndex() {
return -1;
}
@Override
public String getFileName() {
return element.getFileName();
}
@Override
public int getLineNumber() {
return element.getLineNumber();
}
@Override
public boolean isNativeMethod() {
return element.isNativeMethod();
}
@Override
public StackTraceElement toStackTraceElement() {
return element;
}
}
}
backport9-1.10/src/main/java/com/headius/backport9/stack/impl/StackWalker9.java 0000664 0000000 0000000 00000003272 13731553066 0027315 0 ustar 00root root 0000000 0000000 package com.headius.backport9.stack.impl;
import com.headius.backport9.stack.StackWalker;
import java.util.function.Function;
import java.util.stream.Stream;
public class StackWalker9 implements StackWalker {
private final java.lang.StackWalker walker;
public StackWalker9() {
walker = java.lang.StackWalker.getInstance();
}
@Override
public T walk(Function, ? extends T> function) {
// start at 1 to remove this frame from the walk
return walker.walk(stream -> function.apply(stream.skip(1).map(frame -> new StackFrame9(frame))));
}
private static class StackFrame9 implements StackFrame {
final java.lang.StackWalker.StackFrame frame;
StackFrame9(java.lang.StackWalker.StackFrame frame) {
this.frame = frame;
}
@Override
public String getClassName() {
return frame.getClassName();
}
@Override
public String getMethodName() {
return frame.getMethodName();
}
@Override
public Class getDeclaringClass() {
return null;
}
@Override
public int getByteCodeIndex() {
return -1;
}
@Override
public String getFileName() {
return frame.getFileName();
}
@Override
public int getLineNumber() {
return frame.getLineNumber();
}
@Override
public boolean isNativeMethod() {
return frame.isNativeMethod();
}
@Override
public StackTraceElement toStackTraceElement() {
return frame.toStackTraceElement();
}
}
}
backport9-1.10/src/test/ 0000775 0000000 0000000 00000000000 13731553066 0015110 5 ustar 00root root 0000000 0000000 backport9-1.10/src/test/java/ 0000775 0000000 0000000 00000000000 13731553066 0016031 5 ustar 00root root 0000000 0000000 backport9-1.10/src/test/java/com/ 0000775 0000000 0000000 00000000000 13731553066 0016607 5 ustar 00root root 0000000 0000000 backport9-1.10/src/test/java/com/headius/ 0000775 0000000 0000000 00000000000 13731553066 0020231 5 ustar 00root root 0000000 0000000 backport9-1.10/src/test/java/com/headius/backport9/ 0000775 0000000 0000000 00000000000 13731553066 0022127 5 ustar 00root root 0000000 0000000 backport9-1.10/src/test/java/com/headius/backport9/modules/ 0000775 0000000 0000000 00000000000 13731553066 0023577 5 ustar 00root root 0000000 0000000 backport9-1.10/src/test/java/com/headius/backport9/modules/TestModules.java 0000664 0000000 0000000 00000001161 13731553066 0026711 0 ustar 00root root 0000000 0000000 package com.headius.backport9.modules;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
public class TestModules {
@Test
public void testModulesIsOpen() {
// This class
assertTrue(Modules.isOpen(TestModules.class, TestModules.class));
}
@Test
public void testModuleGetName() {
assertEquals(System.class.getModule().getName(), Modules.getModule(System.class).getName());
}
@Test
public void testModulesIsExported() {
assertTrue(Modules.isExported(TestModules.class, TestModules.class));
}
}