pax_global_header 0000666 0000000 0000000 00000000064 12156043265 0014516 g ustar 00root root 0000000 0000000 52 comment=3ff406525c09f66889508060e7dc81e86a70da73
bridge-method-injector-bridge-method-injector-parent-1.8/ 0000775 0000000 0000000 00000000000 12156043265 0023525 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/.gitignore 0000664 0000000 0000000 00000000031 12156043265 0025507 0 ustar 00root root 0000000 0000000 target
*.iml
*.ipr
*.iws
bridge-method-injector-bridge-method-injector-parent-1.8/annotation/ 0000775 0000000 0000000 00000000000 12156043265 0025677 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/annotation/pom.xml 0000664 0000000 0000000 00000001344 12156043265 0027216 0 ustar 00root root 0000000 0000000 4.0.0com.infradna.toolbridge-method-injector-parent1.8../pom.xmlbridge-method-annotationBridge method injection annotationsorg.jenkins-ciannotation-indexer1.4
bridge-method-injector-bridge-method-injector-parent-1.8/annotation/src/ 0000775 0000000 0000000 00000000000 12156043265 0026466 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/annotation/src/main/ 0000775 0000000 0000000 00000000000 12156043265 0027412 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/annotation/src/main/java/ 0000775 0000000 0000000 00000000000 12156043265 0030333 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/annotation/src/main/java/com/ 0000775 0000000 0000000 00000000000 12156043265 0031111 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/annotation/src/main/java/com/infradna/ 0000775 0000000 0000000 00000000000 12156043265 0032673 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/annotation/src/main/java/com/infradna/tool/0000775 0000000 0000000 00000000000 12156043265 0033650 5 ustar 00root root 0000000 0000000 0000775 0000000 0000000 00000000000 12156043265 0040262 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/annotation/src/main/java/com/infradna/tool/bridge_method_injector BridgeMethodsAdded.java 0000664 0000000 0000000 00000003253 12156043265 0044572 0 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/annotation/src/main/java/com/infradna/tool/bridge_method_injector /*
* The MIT License
*
* Copyright (c) 2010, InfraDNA, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.infradna.tool.bridge_method_injector;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
/**
* This annotation is added after the class transformation to indicate that
* the class has already been processed by {@link MethodInjector}.
*
*
* Used for up-to-date check to avoid unnecessary transformations.
*
* @author Kohsuke Kawaguchi
*/
@Retention(CLASS)
@Target(TYPE)
public @interface BridgeMethodsAdded {
}
WithBridgeMethods.java 0000664 0000000 0000000 00000006672 12156043265 0044514 0 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/annotation/src/main/java/com/infradna/tool/bridge_method_injector /*
* The MIT License
*
* Copyright (c) 2010, InfraDNA, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.infradna.tool.bridge_method_injector;
import org.jvnet.hudson.annotation_indexer.Indexed;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.CLASS;
/**
* Request that bridge methods of the same name and same arguments be generated
* with each specified type as the return type. This helps you maintain binary compatibility
* as you evolve your classes.
*
*
* For example, if you have the following code:
*
*
* @WithBridgeMethods(Foo.class)
* public FooSubType getFoo() { ... }
*
*
*
* The Maven mojo will insert the following bridge method:
*
*
* public Foo getFoo() {
* return getFoo(); // invokevirtual to getFoo() that returns FooSubType
* }
*
*
*
*
* In some cases, it's necessary to widen the return type of a method, but in a way that legacy
* calls would still return instances of the original type. In this case, add
* {@link #castRequired() castRequired=true} to the annotation. For example, if you have the
* following code:
*
* The Maven mojo will insert the following bridge method:
*
*
* public FooSubType createFoo(Class clazz) {
* return (FooSubType) createFoo(clazz); // invokeVirtual to createFoo that returns Foo
* }
*
* @author Kohsuke Kawaguchi
*/
@Retention(CLASS)
@Target(METHOD)
@Documented
@Indexed
public @interface WithBridgeMethods {
/**
* Specifies the return types. These types must be assignable to the actual
* method return type, or {@link #castRequired()} should be set to true.
*/
Class[] value();
/**
* Specifies whether the injected bridge methods should perform a cast prior to returning. Only
* set this to true when it is known that calls to the bridge methods will in fact return
* types assignable to the actual method return type, even though declared return types are
* not assignable to the actual method return type.
*
* @since 1.4
*/
boolean castRequired() default false;
}
bridge-method-injector-bridge-method-injector-parent-1.8/injector/ 0000775 0000000 0000000 00000000000 12156043265 0025342 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/pom.xml 0000664 0000000 0000000 00000013654 12156043265 0026670 0 ustar 00root root 0000000 0000000 4.0.0com.infradna.toolbridge-method-injector-parent1.8../pom.xmlbridge-method-injectormaven-pluginbridge-method-injectorEvolve your classes without breaking compatibilitymaven-compiler-plugin1.51.5org.apache.maven.pluginsmaven-release-plugin2.0org.apache.maven.scmmaven-scm-provider-gitexe1.2maven-antrun-pluginruntestcom.suntools1.6system${java.home}/../lib/tools.jarorg.jvnet.wagon-svnwagon-svn1.9scm:git:git@github.com:infradna/bridge-method-injector.gitkohsukeKohsuke KawaguchiMIT Licenserepositoryhttp://www.opensource.org/licenses/mit-license.php${project.groupId}bridge-method-annotation${project.version}asmasm-debug-all3.2junitjunit3.8.1testorg.apache.mavenmaven-plugin-api2.0.1
bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/ 0000775 0000000 0000000 00000000000 12156043265 0026131 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/main/ 0000775 0000000 0000000 00000000000 12156043265 0027055 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/main/java/ 0000775 0000000 0000000 00000000000 12156043265 0027776 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/main/java/com/ 0000775 0000000 0000000 00000000000 12156043265 0030554 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/main/java/com/infradna/ 0000775 0000000 0000000 00000000000 12156043265 0032336 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/main/java/com/infradna/tool/ 0000775 0000000 0000000 00000000000 12156043265 0033313 5 ustar 00root root 0000000 0000000 0000775 0000000 0000000 00000000000 12156043265 0037725 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/main/java/com/infradna/tool/bridge_method_injector ClassAnnotationInjector.java 0000664 0000000 0000000 00000004711 12156043265 0045371 0 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/main/java/com/infradna/tool/bridge_method_injector /*
* The MIT License
*
* Copyright (c) 2010, InfraDNA, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.infradna.tool.bridge_method_injector;
import org.objectweb.asm.ClassAdapter;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
/**
* Adds class annotations.
*
* @author Kohsuke Kawaguchi
*/
abstract class ClassAnnotationInjector extends ClassAdapter {
ClassAnnotationInjector(ClassVisitor cv) {
super(cv);
}
private boolean emitted = false;
private void maybeEmit() {
if (!emitted) {
emitted = true;
emit();
}
}
protected abstract void emit();
@Override
public void visitInnerClass(String name, String outerName, String innerName, int access) {
maybeEmit();
super.visitInnerClass(name, outerName, innerName, access);
}
@Override
public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
maybeEmit();
return super.visitField(access, name, desc, signature, value);
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
maybeEmit();
return super.visitMethod(access, name, desc, signature, exceptions);
}
@Override
public void visitEnd() {
maybeEmit();
super.visitEnd();
}
}
MethodInjector.java 0000664 0000000 0000000 00000024526 12156043265 0043517 0 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/main/java/com/infradna/tool/bridge_method_injector /*
* The MIT License
*
* Copyright (c) 2010, InfraDNA, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.infradna.tool.bridge_method_injector;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassAdapter;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodAdapter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.EmptyVisitor;
import org.objectweb.asm.tree.AnnotationNode;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import static org.objectweb.asm.ClassWriter.*;
import static org.objectweb.asm.Opcodes.*;
/**
* Injects bridge methods as per {@link WithBridgeMethods}.
*
* @author Kohsuke Kawaguchi
*/
public class MethodInjector {
public void handleRecursively(File f) throws IOException {
if (f.isDirectory()) {
for (File c : f.listFiles())
handleRecursively(c);
} else if (f.getName().endsWith(".class"))
handle(f);
}
public void handle(File classFile) throws IOException {
FileInputStream in = new FileInputStream(classFile);
byte[] image;
try {
ClassReader cr = new ClassReader(new BufferedInputStream(in));
ClassWriter cw = new ClassWriter(cr, COMPUTE_MAXS);
cr.accept(new Transformer(new ClassAnnotationInjectorImpl(cw)),0);
image = cw.toByteArray();
} catch (AlreadyUpToDate _) {
// no need to process this class. it's already up-to-date.
return;
} catch (IOException e) {
throw (IOException)new IOException("Failed to process "+classFile).initCause(e);
} catch (RuntimeException e) {
throw (IOException)new IOException("Failed to process "+classFile).initCause(e);
} finally {
in.close();
}
// write it back
FileOutputStream out = new FileOutputStream(classFile);
out.write(image);
out.close();
}
/**
* Thrown to indicate that there's no need to re-process this class file.
*/
class AlreadyUpToDate extends RuntimeException {
private static final long serialVersionUID = 1L;
}
static class ClassAnnotationInjectorImpl extends ClassAnnotationInjector {
ClassAnnotationInjectorImpl(ClassVisitor cv) {
super(cv);
}
@Override
protected void emit() {
AnnotationVisitor av = cv.visitAnnotation(SYNTHETIC_METHODS_ADDED, false);
av.visitEnd();
}
}
private static class WithBridgeMethodsAnnotationVisitor extends EmptyVisitor {
private boolean castRequired = false;
private List types = new ArrayList();
@Override
public void visit(String name, Object value) {
if ("castRequired".equals(name) && value instanceof Boolean) {
castRequired = (Boolean) value;
}
if (value instanceof Type) {
// assume this is a member of the array of classes named "value" in WithBridgeMethods
types.add((Type) value);
}
}
}
class Transformer extends ClassAdapter {
private String internalClassName;
/**
* Synthetic methods to be generated.
*/
private final List syntheticMethods = new ArrayList();
class SyntheticMethod {
final int access;
final String name;
final String desc;
final String originalSignature;
final String[] exceptions;
final boolean castRequired;
final Type returnType;
SyntheticMethod(int access, String name, String desc, String originalSignature, String[] exceptions, Type returnType, boolean castRequired) {
this.access = access;
this.name = name;
this.desc = desc;
this.originalSignature = originalSignature;
this.exceptions = exceptions;
this.returnType = returnType;
this.castRequired = castRequired;
}
/**
* Injects a synthetic method and send it to cv.
*/
public void inject(ClassVisitor cv) {
Type[] paramTypes = Type.getArgumentTypes(desc);
Type originalReturnType = Type.getReturnType(desc);
MethodVisitor mv = cv.visitMethod(access | ACC_SYNTHETIC | ACC_BRIDGE, name,
Type.getMethodDescriptor(returnType, paramTypes), null/*TODO:is this really correct?*/, exceptions);
if ((access&ACC_ABSTRACT)==0) {
mv.visitCode();
int sz = 0;
boolean isStatic = (access & ACC_STATIC) != 0;
if (!isStatic) {
mv.visitVarInsn(ALOAD,0);
sz++;
}
for (Type p : paramTypes) {
mv.visitVarInsn(p.getOpcode(ILOAD), sz);
sz += p.getSize();
}
mv.visitMethodInsn(
isStatic ? INVOKESTATIC : INVOKEVIRTUAL,internalClassName,name,desc);
if (castRequired) {
mv.visitTypeInsn(CHECKCAST, returnType.getInternalName());
}
if (returnType.equals(Type.VOID_TYPE) || returnType.getClassName().equals("java.lang.Void")) {
// bridge to void, which means disregard the return value from the original method
switch (originalReturnType.getSize()) {
case 1:
mv.visitInsn(originalReturnType.getOpcode(POP));
break;
case 2:
mv.visitInsn(originalReturnType.getOpcode(POP2));
break;
default:
throw new AssertionError("Unexpected operand size: "+originalReturnType);
}
}
mv.visitInsn(returnType.getOpcode(IRETURN));
mv.visitMaxs(sz,0);
}
mv.visitEnd();
}
}
Transformer(ClassVisitor cv) {
super(cv);
}
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
this.internalClassName = name;
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
if (desc.equals(SYNTHETIC_METHODS_ADDED))
throw new AlreadyUpToDate(); // no need to process this class
return super.visitAnnotation(desc, visible);
}
/**
* Look for methods annotated with {@link WithBridgeMethods}.
*/
@Override
public MethodVisitor visitMethod(final int access, final String name, final String mdesc, final String signature, final String[] exceptions) {
MethodVisitor mv = super.visitMethod(access, name, mdesc, signature, exceptions);
return new MethodAdapter(mv) {
@Override
public AnnotationVisitor visitAnnotation(String adesc, boolean visible) {
final AnnotationVisitor av = super.visitAnnotation(adesc, visible);
if (adesc.equals(WITH_SYNTHETIC_METHODS))
return new AnnotationNode(adesc) {
@Override
public void visitEnd() {
super.visitEnd();
// forward this annotation to the receiver
accept(av);
WithBridgeMethodsAnnotationVisitor annotationVisitor =
new WithBridgeMethodsAnnotationVisitor();
accept(annotationVisitor);
for (Type type : annotationVisitor.types)
syntheticMethods.add(new SyntheticMethod(
access,name,mdesc,signature,exceptions,type, annotationVisitor.castRequired
));
}
};
return av;
}
};
}
/**
* Inject methods at the end.
*/
@Override
public void visitEnd() {
for (SyntheticMethod m : syntheticMethods)
m.inject(cv);
super.visitEnd();
}
}
public static void main(String[] args) throws IOException {
MethodInjector mi = new MethodInjector();
for (String a : args) {
mi.handleRecursively(new File(a));
}
}
private static final String SYNTHETIC_METHODS_ADDED = Type.getDescriptor(BridgeMethodsAdded.class);
private static final String WITH_SYNTHETIC_METHODS = Type.getDescriptor(WithBridgeMethods.class);
}
ProcessMojo.java 0000664 0000000 0000000 00000005472 12156043265 0043043 0 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/main/java/com/infradna/tool/bridge_method_injector /*
* The MIT License
*
* Copyright (c) 2010, InfraDNA, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.infradna.tool.bridge_method_injector;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
/**
* @author Kohsuke Kawaguchi
* @goal process
* @phase process-classes
* @requiresDependencyResolution runtime
*/
public class ProcessMojo extends AbstractMojo {
/**
* The directory containing generated classes.
*
* @parameter expression="${project.build.outputDirectory}"
* @required
*/
private File classesDirectory;
public void execute() throws MojoExecutionException, MojoFailureException {
File index = new File(classesDirectory, "META-INF/annotations/" + WithBridgeMethods.class.getName());
if (!index.exists()) {
getLog().debug("Skipping because there's no "+index);
return;
}
BufferedReader r = null;
try {
r = new BufferedReader(new InputStreamReader(new FileInputStream(index),"UTF-8"));
String line;
while ((line=r.readLine())!=null) {
File classFile = new File(classesDirectory,line.replace('.','/')+".class");
getLog().debug("Processing "+line);
new MethodInjector().handle(classFile);
}
} catch (IOException e) {
throw new MojoExecutionException("Failed to process @WithBridgeMethods",e);
} finally {
try {
if (r!=null) r.close();
} catch (IOException _) {
}
}
}
}
bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/ 0000775 0000000 0000000 00000000000 12156043265 0027110 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/client/ 0000775 0000000 0000000 00000000000 12156043265 0030366 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/client/Main.java 0000664 0000000 0000000 00000002463 12156043265 0032122 0 ustar 00root root 0000000 0000000 public class Main {
public static void main(String[] args) throws Exception {
// invocation of void method. verify that it runs without error
Foo.hello();
Object o = new Foo().getMessage();
assertEquals(args[0],o);
String n = new Foo().getString();
assertEquals(args[0],n);
Object s = Foo.getStaticMessage();
assertEquals(args[0],s);
Object w = Foo.methodToWiden(String.class);
assertEquals(args[0],w);
// using reflection to ensure that JIT isn't doing inlining
check((Foo)Foo.class.newInstance(),args[0]);
// still a work in progress
// check((Bar)Bar.class.newInstance(),args[0]);
}
private static void assertEquals(Object expected, Object actual) {
System.out.println("We got "+actual+", expecting "+expected);
if (!actual.equals(expected))
System.exit(1);
}
private static void check(IFoo f, String expected) {
Object o = f.getMessage();
assertEquals(expected,o);
String n = f.getString();
assertEquals(expected,n);
}
private static void check(IBar f, String expected) {
Object o = f.narrow();
assertEquals(expected,o);
String n = f.widen();
assertEquals(expected,n);
}
}
bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v1/ 0000775 0000000 0000000 00000000000 12156043265 0027436 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v1/Bar.java 0000664 0000000 0000000 00000000176 12156043265 0031011 0 ustar 00root root 0000000 0000000 public class Bar implements IBar {
public String widen() { return "foo"; }
public Object narrow() { return "foo"; }
} bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v1/Foo.java 0000664 0000000 0000000 00000001122 12156043265 0031020 0 ustar 00root root 0000000 0000000 public class Foo implements IFoo {
/**
* Testing narrowing. In v2, we'll narrow this to return the String type. This is type safe.
*/
public Object getMessage() {
return "foo";
}
/**
* Testing widening. In v2, we'll widen this to Object. Potentially type unsafe.
*/
public String getString() {
return "foo";
}
public static Object getStaticMessage() {
return "foo";
}
public static T methodToWiden(Class clazz) {
return clazz.cast("foo");
}
public static void hello() {}
} bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v1/IBar.java 0000664 0000000 0000000 00000000102 12156043265 0031107 0 ustar 00root root 0000000 0000000 public interface IBar {
String widen();
Object narrow();
} bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v1/IFoo.java 0000664 0000000 0000000 00000000130 12156043265 0031127 0 ustar 00root root 0000000 0000000 public interface IFoo {
public Object getMessage();
public String getString();
} bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v2/ 0000775 0000000 0000000 00000000000 12156043265 0027437 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v2/Bar.java 0000664 0000000 0000000 00000000176 12156043265 0031012 0 ustar 00root root 0000000 0000000 public class Bar implements IBar {
public Object widen() { return "bar"; }
public String narrow() { return "bar"; }
} bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v2/Foo.java 0000664 0000000 0000000 00000001344 12156043265 0031027 0 ustar 00root root 0000000 0000000 import com.infradna.tool.bridge_method_injector.WithBridgeMethods;
public class Foo implements IFoo {
@WithBridgeMethods(Object.class)
public String getMessage() {
return "bar";
}
/**
* Widening String to Object.
*/
@WithBridgeMethods(value=String.class,castRequired=true)
public Object getString() {
return "bar";
}
@WithBridgeMethods(Object.class)
public static String getStaticMessage() {
return "bar";
}
@WithBridgeMethods(value=String.class, castRequired=true)
public static T methodToWiden(Class clazz) {
return clazz.cast("bar");
}
@WithBridgeMethods(void.class)
public static boolean hello() {
return true;
}
} bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v2/IBar.java 0000664 0000000 0000000 00000000350 12156043265 0031115 0 ustar 00root root 0000000 0000000 import com.infradna.tool.bridge_method_injector.WithBridgeMethods;
public interface IBar {
@WithBridgeMethods(value=String.class,castRequired=true)
Object widen();
@WithBridgeMethods(Object.class)
String narrow();
} bridge-method-injector-bridge-method-injector-parent-1.8/injector/src/test/v2/IFoo.java 0000664 0000000 0000000 00000000377 12156043265 0031145 0 ustar 00root root 0000000 0000000 import com.infradna.tool.bridge_method_injector.WithBridgeMethods;
public interface IFoo {
@WithBridgeMethods(Object.class)
public String getMessage();
@WithBridgeMethods(value=String.class,castRequired=true)
public Object getString();
} bridge-method-injector-bridge-method-injector-parent-1.8/pom.xml 0000664 0000000 0000000 00000005026 12156043265 0025045 0 ustar 00root root 0000000 0000000 4.0.0com.infradna.toolbridge-method-injector-parent1.8pomBridge Method Injection Parent POMEvolve your classes without breaking compatibilityannotationinjectormaven-compiler-plugin1.51.5org.apache.maven.pluginsmaven-release-plugin2.0org.apache.maven.scmmaven-scm-provider-gitexe1.2org.jvnet.wagon-svnwagon-svn1.9scm:git:git@github.com:infradna/bridge-method-injector.gitkohsukeKohsuke KawaguchiMIT Licenserepositoryhttp://www.opensource.org/licenses/mit-license.phpmaven.jenkins-ci.orghttp://maven.jenkins-ci.org:8081/content/repositories/releasesorg.apache.maven.pluginsmaven-javadoc-plugintrue
bridge-method-injector-bridge-method-injector-parent-1.8/src/ 0000775 0000000 0000000 00000000000 12156043265 0024314 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/src/site/ 0000775 0000000 0000000 00000000000 12156043265 0025260 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/src/site/apt/ 0000775 0000000 0000000 00000000000 12156043265 0026044 5 ustar 00root root 0000000 0000000 bridge-method-injector-bridge-method-injector-parent-1.8/src/site/apt/index.apt.vm 0000664 0000000 0000000 00000011257 12156043265 0030310 0 ustar 00root root 0000000 0000000 What's this?
When you are writing a library, there are various restrictions about the kind of changes you can make, in order to maintain binary compatibility.
One such restriction is an inability to restrict the return type. Say in v1 of your library you had the following code:
------------------------
public Foo getFoo() {
return new Foo();
}
------------------------
In v2, say if you introduce a subtype of <<>> called <<>>, and you want to change the getFoo method to return <<>>.
------------------------
public FooSubType getFoo() {
return new FooSubType();
}
------------------------
But if you do this, you break the binary compatibility. The clients need to be recompiled to be able to work with the new signature. This is where this bridge method injector can help. By adding an annotation like the following:
------------------------
@WithBridgeMethods(Foo.class)
public FooSubType getFoo() {
return new FooSubType();
}
------------------------
... and running the bytecode post processor, your class file will get the additional "bridge methods." In pseudo-code, it'll look like this:
------------------------
// your original definition
@WithBridgeMethods(Foo.class)
public FooSubType getFoo() {
return new FooSubType();
}
// added bridge method
public Foo getFoo() {
invokevirtual this.getFoo()LFooSubType;
areturn
}
------------------------
Such code isn't allowed in Java source files, but class files allow that. With this addition, existing clients will continue to function.
In this way, you can evolve your classes more easily without breaking backward compatibility.
Widening the return type
In some cases, it's convenient to widen the return type of a method. As this is potentially a type-unsafe change
(as the callee can return a type that's not assignable to what the caller expects), so
you as a programmer explicitly need to tell us that you know what you are doing by adding
<<>> to the annotation. For example, suppose that v1 had a method:
------------------------
public createFoo(Class clazz) {
return clazz.newInstance();
}
------------------------
and in v2 you wanted to widen this method to. Note that you can prove that this is still type-safe, while
your compile cannot:
------------------------
public createFoo(Class clazz) {
return clazz.newInstance();
}
------------------------
The annotation to provide backwards compatibility would be:
------------------------
@WithBridgeMethods(value=FooSubType.class, castRequired=true)
public createFoo(Class clazz) {
return clazz.newInstance();
}
------------------------
Running the bytecode post processor, the resulting class file will look like the following pseudo-code:
------------------------
// your original definition
@WithBridgeMethods(value=FooSubType.class, castRequired=true)
public createFoo(Class clazz) {
return clazz.newInstance();
}
// added bridge method
public FooSubType createFoo(Class clazz) {
invokevirtual this.createFoo(java/lang/Class)LFoo
checkcast FooSubType
areturn
}
------------------------
Bridge Methods and Interfaces
You can use <<<@WithBridgeMethods>>> with interfaces, too. However, making this work correctly is tricky,
as you have to ensure that bridge methods are implemented on all the classes that implement the interface,
for example by adding <<<@WithBridgeMethods>>> on every implementation of the method in question,
or by introducing a base class that provides a bridge method.
Integration into Your Build
Add the following dependency in your POM. This dependency is only necessary during the compile time and not runtime, so an optional dependency is suffice.
------------------------
com.infradna.toolbridge-method-annotation1.4true
------------------------
Then put the following fragment in your build to have the byte-code post processor kick in to inject the necessary bridge methods.
------------------------
com.infradna.toolbridge-method-injector1.4process
------------------------
The artifacts are deployed to {{{http://maven.dyndns.org/2/com/infradna/tool/bridge-method-injector/}java.net Maven2 repository}}.
bridge-method-injector-bridge-method-injector-parent-1.8/src/site/site.xml 0000664 0000000 0000000 00000001556 12156043265 0026755 0 ustar 00root root 0000000 0000000
Bridge Method Injectorhttp://bridge-method-injector.infradna.com/org.kohsukemaven-skin1.1