question: protected boolean computeChildren ( OpenableElementInfo info , File underlyingResource ) throws JavaModelException { HashtableOfArrayToObject rawPackageInfo = new HashtableOfArrayToObject ( ) ; IJavaElement [ ] children ; ZipFile jar = null ; try { String compliance = CompilerOptions . VERSION_1_8 ; jar = getJar ( ) ; rawPackageInfo . put ( CharOperation . NO_STRINGS , new ArrayList [ ] { EMPTY_LIST , EMPTY_LIST } ) ; for ( Enumeration e = jar . entries ( ) ; e . hasMoreElements ( ) ; ) { ZipEntry member = ( ZipEntry ) e . nextElement ( ) ; initRawPackageInfo ( rawPackageInfo , member . getName ( ) , member . isDirectory ( ) , compliance ) ; } children = new IJavaElement [ rawPackageInfo . size ( ) ] ; int index = 0 ; for ( int i = 0 , length = rawPackageInfo . keyTable . length ; i < length ; i ++ ) { String [ ] pkgName = ( String [ ] ) rawPackageInfo . keyTable [ i ] ; if ( pkgName == null ) continue ; children [ index ++ ] = getPackageFragment ( pkgName ) ; } } catch ( CoreException e ) { if ( e . getCause ( ) instanceof ZipException ) { Util . log ( IStatus . ERROR , "Invalid ZIP archive: " + toStringWithAncestors ( ) ) ; children = NO_ELEMENTS ; } else if ( e instanceof JavaModelException ) { throw ( JavaModelException ) e ; } else { throw new JavaModelException ( e ) ; } } finally { manager . closeZipFile ( jar ) ; } info . setChildren ( children ) ; ( ( JarPackageFragmentRootInfo ) info ) . rawPackageInfo = rawPackageInfo ; return true ; }
target:  Compute the package fragment children of this package fragment root. These are all of the directory zip entries, and any directories implied by the path of class files contained in the jar of this package fragment root.