java - Using primitive types with ClassLoader -

-

i've got piece of code used turn string representations delivered class.getcanonicalname() corresponding instances of class. can done using classloader.loadclass("classname"). however, fails on primitive types throwing classnotfoundexception. solution came across this:

private class<?> stringtoclass(string classname) throws classnotfoundexception {     if("int".equals(classname)) {         return int.class;     } else if("short".equals(classname)) {         return short.class;     } else if("long".equals(classname)) {         return long.class;     } else if("float".equals(classname)) {         return float.class;     } else if("double".equals(classname)) {         return double.class;     } else if("boolean".equals(classname)) {         return boolean.class;     }     return classloader.getsystemclassloader().loadclass(classname); }

that seems very nasty me, there clean approach this?

since have exception this: class.forname(int.class.getname()), way go.

checking spring framework code http://static.springsource.org/spring/docs/3.1.x/javadoc-api/org/springframework/util/classutils.html class, method resolveprimitiveclassname , see same thing, map ;). source code: http://grepcode.com/file/repository.springsource.com/org.springframework/org.springframework.core/3.1.0/org/springframework/util/classutils.java#classutils.resolveprimitiveclassname%28java.lang.string%29

something this:

private static final map primitivetypenamemap = new hashmap(16); // , populate primitivetypenames.addall(arrays.aslist(new class[] {         boolean[].class, byte[].class, char[].class, double[].class,         float[].class, int[].class, long[].class, short[].class})); (iterator = primitivetypenames.iterator(); it.hasnext();) {     class primitiveclass = (class) it.next();     primitivetypenamemap.put(primitiveclass.getname(), primitiveclass); }

Comments

Post a Comment

Popular posts from this blog

c# - SVN Error : "svnadmin: E205000: Too many arguments" -

-
i trying reposotries using c# code process svncommand = null; var psi = new processstartinfo("svnadmin"); psi.redirectstandardoutput = true; psi.redirectstandarderror = true; psi.useshellexecute = false; psi.arguments= @"dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump"; using (svncommand = process.start(psi)) { var myoutput = svncommand.standardoutput; var myerror = svncommand.standarderror; debug.write("output :" + environment.newline + environment.newline + myoutput.readtoend() + environment.newline + "error :" + environment.newline + environment.newline + myerror.readtoend()); svncommand.close(); } when use dump command commandline svnadmin dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump it works fine when try ...
Read more

c# - Copy ObservableCollection to another ObservableCollection -

-
how copy observablecollection item observablecollection without reference of first collection? here observablecollection item value changes affecting both collections. code private observablecollection<ratemodel> _allmetalrate = new observablecollection<ratemodel>(); private observablecollection<ratemodel> _metalrateondate = new observablecollection<ratemodel>(); public observablecollection<ratemodel> allmetalrate { { return this._allmetalrate; } set { this._allmetalrate = value; notifypropertychanged("metalrate"); } } public observablecollection<ratemodel> metalrateondate { { return this._metalrateondate; } set { this._metalrateondate = value; notifypropertychanged("metalrateondate"); } } foreach (var item in metalrateondate) allmetalrate.add(item); what causing , how can solve it? you need clone object referenced item before it's a...
Read more

All overlapping substrings matching a java regex -

-
is there api method returns (possibly overlapping) substrings match regular expression? for example, have text string: string t = 04/31 412-555-1235; , , have pattern: pattern p = new pattern("\\d\\d+"); matches strings of 2 or more characters. the matches are: 04, 31, 412, 555, 1235. how overlapping matches? i want code return: 04, 31, 41, 412, 12, 55, 555, 55, 12, 123, 1235, 23, 235, 35. theoretically should possible -- there obvious o(n^2) algorithm enumerates , checks substrings against pattern. edit rather enumerating substrings, safer use region(int start, int end) method in matcher . checking pattern against separate, extracted substring might change result of match (e.g. if there non-capturing group or word boundary check @ start/end of pattern). edit 2 actually, it's unclear whether region() expect zero-width matches. specification vague, , experiments yield disappointing results. for example: string line = "xx90xx"; strin...
Read more