Re: ConstantNameAndType...how do get the type?

Thu, 13 Jan 2005 14:29:38 -0800

Yes, i bleieve CONSTANT_NameAndType can signify fields or methods.
I'm not sure at this level (getTag), you can differentiate, but could be wrong.


----- Original Message ----- From: "Dean Hiller" <[EMAIL PROTECTED]>
To: "BCEL Users List" <[email protected]>
Sent: Thursday, January 13, 2005 2:55 PM
Subject: Re: ConstantNameAndType...how do get the type?


Actually after the -g option is added, it works great, but I am confused now
and this is more just for my knowledge.

The one thing I don't get is I have a case statement for all the Constants
in the ConstantPool

Notice this one case statement....(My question is in the comments in the
below code...)

byte tag = c.getTag();
switch(tag) {
case Constants.CONSTANT_Class:
///some stuff....
break;
case Constants.CONSTANT_Fieldref:
//some stuff
break;
case Constants.CONSTANT_NameAndType:
//Here I seem to be getting field signatures and method signatures
//ie. I can use getReturnTypes but it will throw an exception on
some and on others I can use the code you gave me previously.
// How do I tell if it is a field signature or method signature???
break;

thanks,
dean


----- Original Message ----- From: "Dave Brosius" <[EMAIL PROTECTED]>
To: "BCEL Users List" <[email protected]>
Sent: Thursday, January 13, 2005 8:50 AM
Subject: Re: ConstantNameAndType...how do get the type?


Oh, ()V is a method signature.

Use

Type getReturnType(String signature)
or
Type[] getArgumentTypes(String signature)


----- Original Message ----- From: "Dean Hiller" <[EMAIL PROTECTED]>
To: "BCEL Users List" <[email protected]>
Sent: Thursday, January 13, 2005 9:53 AM
Subject: Re: ConstantNameAndType...how do get the type?


> thanks much for the hint, though that didn't seem to work as other
> constants
> then caused what looks like the same exception even though the code is
> different.
>
> Here is the code with line numbers...
>
> 193      String sig5 = ((ConstantNameAndType)c).getSignature(pool);
> 194      log("type="+Type.getType(sig5));
>
> Here is the exception...notice the exception coming out of line
194....(Is
> there some way to prevent this? This looks like the same exception I
got 
> with my previous code)
>
> 1)
>
testLocalVarDepend(net.sf.antcontrib.design.VerifyDesignTest)C:\ROOT\views\s 
> fviews\ant-contrib2\test\resources\design\verifydesign.xml:102:
> org.apache.bcel.classfile.ClassFormatException: Invalid method
signature: 
> ()V
>
> at org.apache.tools.ant.Task.perform(Task.java:373)
>
> at org.apache.tools.ant.Target.execute(Target.java:341)
>
> at org.apache.tools.ant.Target.performTasks(Target.java:369)
>
> at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
>
> at
> org.apache.tools.ant.BuildFileTest.executeTarget(BuildFileTest.java:232)
>
> at
>
net.sf.antcontrib.design.VerifyDesignTest.testLocalVarDepend(VerifyDesignTes 
> t.java:116)
>
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>
> at
>
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39 
> )
>
> at
>
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl 
> .java:25)
>
> at
>
net.sf.antcontrib.design.VerifyDesignTest.main(VerifyDesignTest.java:205) 
>
> Caused by: org.apache.bcel.classfile.ClassFormatException: Invalid
method 
> signature: ()V
>
> at org.apache.bcel.classfile.Utility.typeOfSignature(Utility.java:1024)
>
> at org.apache.bcel.generic.Type.getType(Type.java:158)
>
> at
>
net.sf.antcontrib.design.VerifyDesign.processConstant(VerifyDesign.java:194) 
>
> at
>
net.sf.antcontrib.design.VerifyDesign.processConstantPool(VerifyDesign.java: 
> 152)
>
> at
>
net.sf.antcontrib.design.VerifyDesign.verifyClassAdheresToDesign(VerifyDesig 
> n.java:136)
>
> at net.sf.antcontrib.design.VerifyDesign.execute(VerifyDesign.java:94)
>
> at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
>
> at org.apache.tools.ant.Task.perform(Task.java:364)
>
> ... 21 more
>
> --- Nested Exception ---
>
> org.apache.bcel.classfile.ClassFormatException: Invalid method
signature: 
> ()V
>
> at org.apache.bcel.classfile.Utility.typeOfSignature(Utility.java:1024)
>
> at org.apache.bcel.generic.Type.getType(Type.java:158)
>
> at
>
net.sf.antcontrib.design.VerifyDesign.processConstant(VerifyDesign.java:194) 
>
> at
>
net.sf.antcontrib.design.VerifyDesign.processConstantPool(VerifyDesign.java: 
> 152)
>
> at
>
net.sf.antcontrib.design.VerifyDesign.verifyClassAdheresToDesign(VerifyDesig 
> n.java:136)
>
> at net.sf.antcontrib.design.VerifyDesign.execute(VerifyDesign.java:94)
>
> at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
>
> at org.apache.tools.ant.Task.perform(Task.java:364)
>
> at org.apache.tools.ant.Target.execute(Target.java:341)
>
> at org.apache.tools.ant.Target.performTasks(Target.java:369)
>
> at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
>
> at
> org.apache.tools.ant.BuildFileTest.executeTarget(BuildFileTest.java:232)
>
> at
>
net.sf.antcontrib.design.VerifyDesignTest.testLocalVarDepend(VerifyDesignTes 
> t.java:116)
>
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>
> at
>
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39 
> )
>
> at
>
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl 
> .java:25)
>
> at
>
net.sf.antcontrib.design.VerifyDesignTest.main(VerifyDesignTest.java:205)
>
>
> ----- Original Message ----- > From: "Dave Brosius" <[EMAIL PROTECTED]>
> To: "BCEL Users List" <[email protected]>
> Sent: Wednesday, January 12, 2005 11:03 PM
> Subject: Re: ConstantNameAndType...how do get the type?
>
>
>> Can't you use
>> ConstantNameAndType.getSignature(pool), and then
>> Type getType(String signature)
>>
>>
>>
>>
>> I am trying to get the type information out of of a
>> ConstantNameAndType...
>>
>> here is my code so far
>> String temp =
>> pool.constantToString(((ConstantNameAndType)c).getNameIndex(),
>> Constants.CONSTANT_Utf8)
>> + " "
>> +
>> pool.constantToString(((ConstantNameAndType)c).getSignatureIndex(),
>> Constants.CONSTANT_Utf8);
>> log("temp="+temp);
>> String temp2 =
>> pool.constantToString(((ConstantNameAndType)c).getSignatureIndex(),
>> Constants.CONSTANT_Utf8);
>> log("temp2="+temp2);
>> //log("temp2a="+Utility.typeOfSignature(temp2));
>> log("temp3="+Utility.compactClassName(temp2));
>>
>> which prints the following.....
>> const[18]=c Lmod/dummy/DummyClass;
>> inst=org.apache.bcel.classfile.ConstantNameAndType
>>
>> temp=c Lmod/dummy/DummyClass;
>>
>> temp2=Lmod/dummy/DummyClass;
>>
>> temp3=Lmod.dummy.DummyClass;
>>
>> I am just trying to get the mod.dummy.DummyClass string. how do I do
so?
>> If I uncomment the temp2a above it breaks because of other
>> ConstantNameAndTypes like the following message when I uncomment >> temp2a
>> above.....
>>
>> const[18]=<init> ()V >> inst=org.apache.bcel.classfile.ConstantNameAndType
>>
>> temp=<init> ()V
>>
>> temp2=()V
>>
>> E
>>
>> Time: 2.244
>>
>> There was 1 error:
>>
>> 1)
>>
>
testLocalVarDepend(net.sf.antcontrib.design.VerifyDesignTest)C:\ROOT\views\s 
> fviews\ant-contrib2\test\resources\design\verifydesign.xml:102:
>> org.apache.bcel.classfile.ClassFormatException: Invalid method
signature: 
>> ()V
>>
>> at org.apache.tools.ant.Task.perform(Task.java:373)
>>
>> at org.apache.tools.ant.Target.execute(Target.java:341)
>>
>> at org.apache.tools.ant.Target.performTasks(Target.java:369)
>>
>> at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
>>
>> at
> org.apache.tools.ant.BuildFileTest.executeTarget(BuildFileTest.java:232)
>>
>> at
>>
>
net.sf.antcontrib.design.VerifyDesignTest.testLocalVarDepend(VerifyDesignTes 
> t.java:116)
>>
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>
>> at
>>
>
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39 
> )
>>
>> at
>>
>
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl 
> .java:25)
>>
>> at
>
net.sf.antcontrib.design.VerifyDesignTest.main(VerifyDesignTest.java:205) 
>>
>> Caused by: org.apache.bcel.classfile.ClassFormatException: Invalid
method
>> signature: ()V
>>
>> at >> org.apache.bcel.classfile.Utility.typeOfSignature(Utility.java:1024)
>>
>> at
>>
>
net.sf.antcontrib.design.VerifyDesign.processConstant(VerifyDesign.java:189) 
>>
>> at
>>
>
net.sf.antcontrib.design.VerifyDesign.processConstantPool(VerifyDesign.java: 
> 151)
>>
>> at
>>
>
net.sf.antcontrib.design.VerifyDesign.verifyClassAdheresToDesign(VerifyDesig
> n.java:135)
>>
>> at net.sf.antcontrib.design.VerifyDesign.execute(VerifyDesign.java:93)
>>
>> at >> org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
>>
>> at org.apache.tools.ant.Task.perform(Task.java:364)
>>
>> ... 21 more
>>
>> --- Nested Exception ---
>>
>> org.apache.bcel.classfile.ClassFormatException: Invalid method
signature:
>> ()V
>>
>> at >> org.apache.bcel.classfile.Utility.typeOfSignature(Utility.java:1024)
>>
>> at
>>
>
net.sf.antcontrib.design.VerifyDesign.processConstant(VerifyDesign.java:189) 
>>
>> at
>>
>
net.sf.antcontrib.design.VerifyDesign.processConstantPool(VerifyDesign.java: 
> 151)
>>
>> at
>>
>
net.sf.antcontrib.design.VerifyDesign.verifyClassAdheresToDesign(VerifyDesig
> n.java:135)
>>
>> at net.sf.antcontrib.design.VerifyDesign.execute(VerifyDesign.java:93)
>>
>> at >> org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
>>
>> at org.apache.tools.ant.Task.perform(Task.java:364)
>>
>> at org.apache.tools.ant.Target.execute(Target.java:341)
>>
>> at org.apache.tools.ant.Target.performTasks(Target.java:369)
>>
>> at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
>>
>> at
> org.apache.tools.ant.BuildFileTest.executeTarget(BuildFileTest.java:232)
>>
>> at
>>
>
net.sf.antcontrib.design.VerifyDesignTest.testLocalVarDepend(VerifyDesignTes 
> t.java:116)
>>
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>
>> at
>>
>
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39 
> )
>>
>> at
>>
>
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl 
> .java:25)
>>
>> at
>
net.sf.antcontrib.design.VerifyDesignTest.main(VerifyDesignTest.java:205) 
>>
>> thanks for any help,
>>
>> dean
>>
>>
>>
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>
>
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