Enthuware

Hi,

In this link of java doc http://docs.oracle.com/javase/7/docs/ap ... .String%29
I don't understand why "*" has to be escaped in this line:
C:\\* Matches C:\foo and C:\bar on the Windows platform (note that the backslash is escaped; as a string literal in the Java Language the pattern would be "C:\\\\*")

why shouldn't it be C:\* and in java string "C:\\*"?

Thank you

You are not trying to escape *. You are trying to escape two backslashes i.e. \\.

Thank you for your answer.

OK now why we need two backslashes in this case?

Because you are trying to match c:\foo not c:/foo. So you need to escape \ in the path matcher expression itself. So you get two \ in the expression. When you put it in java code, you need to escape each of them.
This explains more: http://www.jedit.org/users-guide/globs.html
http://mywiki.wooledge.org/glob

Why isn't this discussion about the related question?

I don't understand the explanation: "Path objects that we are checking contain the complete path including directories (such as c:\works\pathtest\a.java and not just a.java). Therefore, nothing will match."

Why doesn't it match a.java
*.java would match everything that ends with .java, right?

EelcoD wrote:Why isn't this discussion about the related question?

What do you mean? The question is about matching paths.

I don't understand the explanation: "Path objects that we are checking contain the complete path including directories (such as c:\works\pathtest\a.java and not just a.java). Therefore, nothing will match."

Why doesn't it match a.java
*.java would match everything that ends with .java, right?

Wrong. The * character matches zero or more characters of a name component without crossing directory boundaries.
Please go through this for complete details : http://docs.oracle.com/javase/7/docs/ap ... ng.String)

HTH,
Paul.

But a.java resides in the pathtest directory, so you're not crossing any boundaries.
What am I missing?

If you run the program and print each Path given to MyFileChecker by walkFileTree, you will see that the Paths are not relative paths. They all start with c:\works\pathtest. So it doesn't get a.java. It gets c:\works\pathtest\a.java. That is why the match fails.

HTH,
Paul.

So, the *.java will try to match it with c:\ or with works\ ?

EelcoD wrote:So, the *.java will try to match it with c:\ or with works\ ?

Not sure what you mean. I would suggest you to run the program and print the value of Path in the check method. Basically, *.java doesn't match c:\works\pathtest\a.java. *.java will only match a.java (which you are not getting in the check method.)

It's hard for me to explain aparently..

The * doesnt cross boundaries meaning it doesnt check past the first backslash?

I guess you can say that.

Would "glob:*{.java}" and "glob:*.{java}" match all the java files just as "glob:**.java" would?

Thanks

What happened when you tried it out?

yeah, they don't...we have to always match against the name of the file, not the whole path if we want one asterisk to work