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See the License for the specific language governing permissions and limitations under the License. backport9-1.10/README.md000066400000000000000000000007501373155306600146230ustar00rootroot00000000000000Backport9 ========= 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.xml000066400000000000000000000040411373155306600146560ustar00rootroot00000000000000 4.0.0 com.headius backport9 1.10 org.sonatype.oss oss-parent 7 The Apache Software License, Version 2.0 http://www.apache.org/licenses/LICENSE-2.0.txt repo scm:git:https://github.com/headius/backport9.git scm:git:git@github.com:headius/backport9.git https://github.com/headius/backport9 headius Charles Nutter headius@headius.com junit junit 4.12 test maven-compiler-plugin 3.7.0 1.8 1.8 maven-javadoc-plugin 3.0.1 8 backport9-1.10/src/000077500000000000000000000000001373155306600141315ustar00rootroot00000000000000backport9-1.10/src/main/000077500000000000000000000000001373155306600150555ustar00rootroot00000000000000backport9-1.10/src/main/java/000077500000000000000000000000001373155306600157765ustar00rootroot00000000000000backport9-1.10/src/main/java/com/000077500000000000000000000000001373155306600165545ustar00rootroot00000000000000backport9-1.10/src/main/java/com/headius/000077500000000000000000000000001373155306600201765ustar00rootroot00000000000000backport9-1.10/src/main/java/com/headius/backport9/000077500000000000000000000000001373155306600220745ustar00rootroot00000000000000backport9-1.10/src/main/java/com/headius/backport9/buffer/000077500000000000000000000000001373155306600233455ustar00rootroot00000000000000backport9-1.10/src/main/java/com/headius/backport9/buffer/Buffers.java000066400000000000000000000053331373155306600256100ustar00rootroot00000000000000package 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/000077500000000000000000000000001373155306600235445ustar00rootroot00000000000000backport9-1.10/src/main/java/com/headius/backport9/modules/Module.java000066400000000000000000000005371373155306600256410ustar00rootroot00000000000000package 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.java000066400000000000000000000076141373155306600260270ustar00rootroot00000000000000package 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/000077500000000000000000000000001373155306600245055ustar00rootroot00000000000000backport9-1.10/src/main/java/com/headius/backport9/modules/impl/Module9.java000066400000000000000000000020261373155306600266660ustar00rootroot00000000000000package 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.java000066400000000000000000000013551373155306600276150ustar00rootroot00000000000000package 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/000077500000000000000000000000001373155306600237205ustar00rootroot00000000000000backport9-1.10/src/main/java/com/headius/backport9/platform/Detect.java000066400000000000000000000005021373155306600257700ustar00rootroot00000000000000package 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/000077500000000000000000000000001373155306600232015ustar00rootroot00000000000000backport9-1.10/src/main/java/com/headius/backport9/stack/StackWalker.java000066400000000000000000000020461373155306600262610ustar00rootroot00000000000000package 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/000077500000000000000000000000001373155306600241425ustar00rootroot00000000000000backport9-1.10/src/main/java/com/headius/backport9/stack/impl/StackWalker8.java000066400000000000000000000037621373155306600273200ustar00rootroot00000000000000package 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.java000066400000000000000000000032721373155306600273150ustar00rootroot00000000000000package 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/000077500000000000000000000000001373155306600151105ustar00rootroot00000000000000backport9-1.10/src/test/java/000077500000000000000000000000001373155306600160315ustar00rootroot00000000000000backport9-1.10/src/test/java/com/000077500000000000000000000000001373155306600166075ustar00rootroot00000000000000backport9-1.10/src/test/java/com/headius/000077500000000000000000000000001373155306600202315ustar00rootroot00000000000000backport9-1.10/src/test/java/com/headius/backport9/000077500000000000000000000000001373155306600221275ustar00rootroot00000000000000backport9-1.10/src/test/java/com/headius/backport9/modules/000077500000000000000000000000001373155306600235775ustar00rootroot00000000000000backport9-1.10/src/test/java/com/headius/backport9/modules/TestModules.java000066400000000000000000000011611373155306600267110ustar00rootroot00000000000000package 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)); } }