java - Filtering sources before compilation in NetBeans & Ant -

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i need filter java files before compilation, leaving original sources unchanged , compiling filtered ones (basically, need set build date , such). i'm using netbeans great ant build-files.

so, 1 day discovered need pre-process source files before compilation, , ran big problem. no, did not run @ once, did research, failed. so, here comes sad story...

i found "filter" option of "copy" task, overrided macrodef "j2seproject3:javac" in build-impl.xml file , added filter in middle of it. got desired result, yes, tests not working, since use macrodef too.

next, tired overriding "-do-compile" target, copying&filtering files directory build/temp-src, , passing argument of new source directory "j2seproject3:javac":

<target depends="init,deps-jar,-pre-pre-compile,-pre-compile, -copy-persistence-xml,         -compile-depend,-prepare-sources"         if="have.sources" name="-do-compile">     <j2seproject3:javac gensrcdir="${build.generated.sources.dir}" srcdir="build/temp-src"/>     <copy todir="${build.classes.dir}">         <fileset dir="${src.dir}" excludes="${build.classes.excludes},${excludes}" includes="${includes}"/>     </copy> </target>

and ant says me, macrodef in question not exist!

the prefix "j2seproject3" element "j2seproject3:javac" not bound.

that's strange, since build-impl.xml contains macrodef, , build-impl.xml imported main build file.

and, way, cannot edit build-impl.xml directly, since netbeans rewrites on every other build.

so, question is: how can automatically filter sources before compiling in netbeans, , not break build process?

looking @ default build.xml, contains comment reads (in part):

there exist several targets default empty , can  used execution of tasks. these targets executed  before , after main targets. are:     -pre-init:                 called before initialization of project properties   -post-init:                called after initialization of project properties   -pre-compile:              called before javac compilation   -post-compile:             called after javac compilation   -pre-compile-single:       called before javac compilation of single file   -post-compile-single:      called after javac compilation of single file   -pre-compile-test:         called before javac compilation of junit tests   -post-compile-test:        called after javac compilation of junit tests   -pre-compile-test-single:  called before javac compilation of single junit test   -post-compile-test-single: called after javac compilation of single juunit test   -pre-jar:                  called before jar building   -post-jar:                 called after jar building   -post-clean:               called after cleaning build products

so, inject pre-compile processing, provide definition -pre-compile.

fwiw, error got because j2seprojectx prefix defined on project tag of build-impl.xml, , code in build.xml outside of tag.


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