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Howto use AST to declare a local variable [message #251679]

Fri, 29 February 2008 00:57

Eclipse User

Originally posted by: rahulrevo.gmail.com

Hi

I am trying to create Java source programatically using the dom.AST
classes. I was unable to get the AST code required for a local variable
declaration. Like ..

double bar = 1.1;

VariableDeclarationFragment allows me to set the name to "bar" and using
an Assignment expression I can create the rest of the expression. I was
not able to get how to set the type of double to the variable and needed
help on this to get the complete expression.

Thanks

Rahul

Re: Howto use AST to declare a local variable [message #251688 is a reply to message #251679]

Fri, 29 February 2008 02:01

Eclipse User

Originally posted by: topgun.in.gmail.com

Rahul,

> not able to get how to set the type of double to the variable and needed

Use SingleVaraibleDeclaration to create the variable.
It allows you to set the variable type through the method
setType(ast.newPrimitveType(PrimitiveType.DOUBLE));
where 'ast' is your AST.

Thanks,
Pushkar

Re: Howto use AST to declare a local variable [message #251707 is a reply to message #251679]

Fri, 29 February 2008 10:38

Eclipse User

Originally posted by: myawn.ebay.com

Rahul Revo wrote:
> Hi
>
> I am trying to create Java source programatically using the dom.AST
> classes. I was unable to get the AST code required for a local variable
> declaration. Like ..
>
> double bar = 1.1;
>
> VariableDeclarationFragment allows me to set the name to "bar" and using
> an Assignment expression I can create the rest of the expression. I was
> not able to get how to set the type of double to the variable and needed
> help on this to get the complete expression.
>
> Thanks
>
> Rahul

You can create a VariableDeclarationStatement, passing your current
fragment into the constructor. The type can then be set for the
VariableDeclarationStatement.

Remember that Java allows you to have a declaration of the form
double foo=1.1, bar=2.2;

which is the reason for the separation of the fragment -- there might be
multiple fragments within a declaration statement.

Mike

Re: Howto use AST to declare a local variable [message #251731 is a reply to message #251707]

Fri, 29 February 2008 13:54

Eclipse User

Originally posted by: rahul.gmail.com

Mike Yawn wrote:
> Rahul Revo wrote:
>> double bar = 1.1;
>>
>> VariableDeclarationFragment allows me to set the name to "bar" and
>> using an Assignment expression I can create the rest of the
>> expression. I was not able to get how to set the type of double to the
>> variable and needed help on this to get the complete expression.
>>
> You can create a VariableDeclarationStatement, passing your current
> fragment into the constructor. The type can then be set for the
> VariableDeclarationStatement.
>
> Remember that Java allows you to have a declaration of the form
> double foo=1.1, bar=2.2;
>
> which is the reason for the separation of the fragment -- there might be
> multiple fragments within a declaration statement.

Thanks. That was what I was looking for.

Rahul

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