[JBoss-user] [Javassist user questions] - Re: reading java 5.0 annotations
Yes, the default value is available from AnnotationDefault attributes. Thank you for your information. I added the support of AnnotationDefault attributes to Javassist. It is available from CVS HEAD or Branch_Javassist_3_0. Chiba View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3868097#3868097 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3868097 --- SF email is sponsored by - The IT Product Guide Read honest candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595alloc_id=14396op=click ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Javassist user questions] - Re: reading java 5.0 annotations
Maybe that is because the default value is not included in each
class file. (I'm not sure)
public @interface Author {
|
| String name() default me;
|
| int age() default 999;
| }
Won't you try to read the annotations of the Author interface?
Regards,
Chiba
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[JBoss-user] [Javassist user questions] - Re: reading java 5.0 annotations
Thankyou. As soon as I stop using default values, all is well! So this presumably means that if I want all the effective annotations, I have to walk the superclasses to get inherited annotations, and access the annotation declaration to get the defaults. Perhaps the API could include some utility methods that would do this for one. There would seem to be two dimensions of generality: inherited annotations from superclasses, and 'inherited' data values from default values. Perhaps something like: anonymous wrote : | getDeclaredAnnotations // just the actual annotations with actual data | // no inherited ones, no default values | | getEffectiveAnnotations // fills in defaults, but no inherited ones | | getAllAnnotations // includes inherited annotations, no default values | | getAllEffectiveAnnotations // includes inherited annotations , | and fills in default values | | What do you think? Benedict View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3865440#3865440 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3865440 --- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag--drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Javassist user questions] - Re: reading java 5.0 annotations
Maybe that is because the default value is not included in each class file. (I'm not sure) I've just discovered in http://java.sun.com/docs/books/vmspec/2nd-edition/ClassFileFormat.pdf stuff about an AnnotationDefault attribute which sounds what I need. It says it contains default values for annottions, but if it did, each class would have the defaults bound in at compile time, whereas I had understood that recompiling the annotation led to each class getting the latest defaults. Does it really contain the default values? If so, is there any way to get at it? Many thanks, Benedict View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3865486#3865486 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3865486 --- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag--drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Javassist user questions] - Re: reading java 5.0 annotations
Can you replace AnnotationsAttribute.invisibleTag with AnnotationsAttribute.visibleTag in the above test code and try again? View the original post : http://www.jboss.org/index.html?module=bbop=viewtopicp=3865395#3865395 Reply to the post : http://www.jboss.org/index.html?module=bbop=postingmode=replyp=3865395 --- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag--drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Javassist user questions] - Re: reading java 5.0 annotations
Thanks for suggestion. I did that: I can now get as far as seeing the @Author
attribute, but cannot
retrieve the name() element. In fact, getMemberNames() always is null.
Benedict
Here's a self-contained test class that shows the problem .
Thanks
Benedict
|
| import java.lang.annotation.Retention;
| import java.lang.annotation.RetentionPolicy;
| import java.util.Arrays;
| import java.util.List;
| import java.util.Set;
|
| import javassist.ClassPool;
| import javassist.CtClass;
| import javassist.CtMethod;
| import javassist.bytecode.AnnotationsAttribute;
| import javassist.bytecode.AttributeInfo;
| import javassist.bytecode.ClassFile;
| import javassist.bytecode.MethodInfo;
| import javassist.bytecode.SourceFileAttribute;
| import javassist.bytecode.annotation.Annotation;
| import javassist.bytecode.annotation.StringMemberValue;
| import junit.framework.TestCase;
| import junit.textui.TestRunner;
|
| /**
| * This test demonstrates that when I try to access annotations using
Javassist,
| * I can get the annotation per se, but the membernames are always null, so
I
| * can't access the data within the annotation.
| * p
| * Output is:
| *
| * pre
| .
|
| -testJavassistMethodAnnotations
| raw [EMAIL PROTECTED] class ProblemTest$Thing
fields=ProblemTest$Thing.this$0:LProblemTest;, [EMAIL PROTECTED]
ProblemTest$Thing (LProblemTest;)V], [EMAIL PROTECTED] methodWithAuthor ()V],
[EMAIL PROTECTED] methodWithoutAuthor ()V], ]
|
| -CtMethod: [EMAIL PROTECTED] methodWithAuthor ()V]
| attr:@ProblemTest$Author
| Author annotation:@ProblemTest$Author
| author.getMemberNames is null
| F.
|
| -testClassAnnotations
| demoCtClass: [EMAIL PROTECTED] class ProblemTest$Thing
fields=ProblemTest$Thing.this$0:LProblemTest;, [EMAIL PROTECTED]
ProblemTest$Thing (LProblemTest;)V], [EMAIL PROTECTED] methodWithAuthor ()V],
[EMAIL PROTECTED] methodWithoutAuthor ()V], ]
| classfile: [EMAIL PROTECTED]
| interfaces: []
| attributes: [EMAIL PROTECTED], [EMAIL PROTECTED], @ProblemTest$Author]
|
| ---
| attribute:[EMAIL PROTECTED]
| an AttributeInfo is of class: class javassist.bytecode.SourceFileAttribute
- [EMAIL PROTECTED]
|
| ---
| attribute:[EMAIL PROTECTED]
| an AttributeInfo is of class: class
javassist.bytecode.InnerClassesAttribute - [EMAIL PROTECTED]
|
| ---
| attribute:@ProblemTest$Author
| annotations: [EMAIL PROTECTED]
|
| ++annotation: @ProblemTest$Author of class class
javassist.bytecode.annotation.Annotation
| interfaces: []
| typename:ProblemTest$Author
| memberNames: null
| We have found the Author annotation, but cannot look at the members!
| memberValue-name: null
| stringMemberValue: null
| F
| Time: 0.141
| There were 2 failures:
| 1)
testJavassistMethodAnnotations(ProblemTest)junit.framework.AssertionFailedError:
stringmembervalue for name() is null
| at ProblemTest.testJavassistMethodAnnotations(ProblemTest.java:166)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at ProblemTest.main(ProblemTest.java:274)
| 2) testClassAnnotations(ProblemTest)junit.framework.AssertionFailedError:
On Author annotation, memberNames is null!
| at ProblemTest.dumpAnnotation(ProblemTest.java:261)
| at ProblemTest.testClassAnnotations(ProblemTest.java:217)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at ProblemTest.main(ProblemTest.java:274)
|
| FAILURES!!!
| Tests run: 2, Failures: 2, Errors: 0
|
|
| * /pre
| *
| * @author bheal .
| */
| public class ProblemTest extends TestCase {
|
| @Retention(RetentionPolicy.RUNTIME)//
| public @interface Author {
|
| String name() default me;
|
| int age() default 999;
| }
|
| @Author//
| class Thing {
|
| @Author public void methodWithAuthor() {
| }
|
| public void methodWithoutAuthor() {
| }
| }
|
| public void setUp() {
| echo(\n\n- + getName());
| }
|
| /**
| * * Output is:
| *
| * pre
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| *
| * .classname:ProblemTest$Thing
| * .raw [EMAIL PROTECTED] class
[JBoss-user] [Javassist user questions] - Re: reading java 5.0 annotations
The current release 3.0 does not provide high-level API.
So you must use the lower-level API, but using it is not difficult.
For example,
| import javassist.*;
| import javassist.bytecode.*;
|
| CtMethod m = ... ;
| MethodInfo minfo = m.getMethodInfo();
| AnnotationsAttribute attr = (AnnotationsAttribute)
| minfo.getAttribute(AnnotationsAttribute.invisibleTag);
| if (atr != null) {
| Annotation an = attr.getAnnotation(Author);
| String s = ((StringMemberValue)a.getMemberValue(name)).getValue();
| System.out.println(@Author(name= + s + ));
| }
|
This prints the @Author annotation of the method m.
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[JBoss-user] [Javassist user questions] - Re: reading java 5.0 annotations
Many thanks for prompt reply. However when I do that, I find that 'attr' is
always null! Here's part of a test of annotating methods.
When I annotate a class, I can get the annotation for the class, but then find
memberNames() always returns null, so cannot get members from within the
annotion.
I have been using the latest .jar from the site, but I also got the CVS source
and rebuilt that, but the effect is the same.
Sorry to appear so slow.
Benedict
anonymous wrote :
|
|@Retention(RetentionPolicy.RUNTIME)//
| public @interface Author {
|
| String name() default me;
|
| int age() default 999;
| }
|
| @Author//
| class Thing {
|
| @Author public void methodWithAuthor() {
| }
|
| public void methodWithoutAuthor() {
| }
| }
|
| /**
| * * Output is:
| *
| *
| *
| *
| *
| * .classname:ProblemTest$Thing
| * .raw [EMAIL PROTECTED] class ProblemTest$Thing
fields=ProblemTest$Thing.this$0:LProblemTest;, [EMAIL PROTECTED]
ProblemTest$Thing (LProblemTest;)V], [EMAIL PROTECTED] methodWithAuthor ()V],
[EMAIL PROTECTED] methodWithoutAuthor ()V], ]
| * CtMethod: [EMAIL PROTECTED] methodWithAuthor ()V]
| * attr:null
| * CtMethod: [EMAIL PROTECTED] methodWithoutAuthor ()V]
| * attr:null
| *
| *
| *
| *
| */
| public void testJavassistMethodAnnotations() throws Exception {
|
| ClassPool pool = ClassPool.getDefault();
|
| String demoClassName = ProblemTest$Thing;
|
| CtClass demoClass = pool.get(demoClassName);
| echo(raw demoClass= + demoClass);
|
| CtMethod[] thingMethods = demoClass.getDeclaredMethods();
|
| for (CtMethod ctMethod : thingMethods) {
| echo(CtMethod: + ctMethod);
|
| MethodInfo mInfo = ctMethod.getMethodInfo();
|
| AnnotationsAttribute attr = (AnnotationsAttribute) mInfo
| .getAttribute(AnnotationsAttribute.invisibleTag);
|
| System.out.println(attr: + attr);
|
| if (attr != null) {
| // we never get here!
| Annotation author = attr.getAnnotation(Author);
| echo(Author annotation: + author);
| String s = ((StringMemberValue)
author.getMemberValue(name)).getValue();
| System.out.println(@Author(name= + s + ));
| }
| }
| }
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