private void checkIncludePatterns()

in src/main/org/apache/tools/ant/DirectoryScanner.java [931:1034]
89 lines of code
36 McCabe index (conditional complexity)

    private void checkIncludePatterns() {
        ensureNonPatternSetsReady();
        final Map<TokenizedPath, String> newroots = new HashMap<>();

        // put in the newroots map the include patterns without
        // wildcard tokens
        for (TokenizedPattern includePattern : includePatterns) {
            final String pattern = includePattern.toString();
            if (!shouldSkipPattern(pattern)) {
                newroots.put(includePattern.rtrimWildcardTokens(), pattern);
            }
        }
        for (final Map.Entry<String, TokenizedPath> entry : includeNonPatterns
            .entrySet()) {
            final String pattern = entry.getKey();
            if (!shouldSkipPattern(pattern)) {
                newroots.put(entry.getValue(), pattern);
            }
        }

        if (newroots.containsKey(TokenizedPath.EMPTY_PATH)
            && basedir != null) {
            // we are going to scan everything anyway
            scandir(basedir, "", true);
        } else {
            File canonBase = null;
            if (basedir != null) {
                try {
                    canonBase = basedir.getCanonicalFile();
                } catch (final IOException ex) {
                    throw new BuildException(ex);
                }
            }
            // only scan directories that can include matched files or
            // directories
            for (final Map.Entry<TokenizedPath, String> entry : newroots.entrySet()) {
                TokenizedPath currentPath = entry.getKey();
                String currentelement = currentPath.toString();
                if (basedir == null && !FileUtils.isAbsolutePath(currentelement)) {
                    continue;
                }
                File myfile = new File(basedir, currentelement);

                if (myfile.exists()) {
                    // may be on a case insensitive file system.  We want
                    // the results to show what's really on the disk, so
                    // we need to double check.
                    try {
                        final String path = (basedir == null)
                            ? myfile.getCanonicalPath()
                            : FILE_UTILS.removeLeadingPath(canonBase,
                                         myfile.getCanonicalFile());
                        if (!path.equals(currentelement) || ON_VMS) {
                            myfile = currentPath.findFile(basedir, true);
                            if (myfile != null && basedir != null) {
                                currentelement = FILE_UTILS.removeLeadingPath(
                                    basedir, myfile);
                                if (!currentPath.toString().equals(currentelement)) {
                                    currentPath = new TokenizedPath(currentelement);
                                }
                            }
                        }
                    } catch (final IOException ex) {
                        throw new BuildException(ex);
                    }
                }

                if ((myfile == null || !myfile.exists()) && !isCaseSensitive()) {
                    final File f = currentPath.findFile(basedir, false);
                    if (f != null && f.exists()) {
                        // adapt currentelement to the case we've
                        // actually found
                        currentelement = (basedir == null)
                            ? f.getAbsolutePath()
                            : FILE_UTILS.removeLeadingPath(basedir, f);
                        myfile = f;
                        currentPath = new TokenizedPath(currentelement);
                    }
                }

                if (myfile != null && myfile.exists()) {
                    if (!followSymlinks && currentPath.isSymlink(basedir)) {
                        accountForNotFollowedSymlink(currentPath, myfile);
                        continue;
                    }
                    if (myfile.isDirectory()) {
                        if (isIncluded(currentPath) && !currentelement.isEmpty()) {
                            accountForIncludedDir(currentPath, myfile, true);
                        }  else {
                            scandir(myfile, currentPath, true);
                        }
                    } else if (myfile.isFile()) {
                        final String originalpattern = entry.getValue();
                        final boolean included = isCaseSensitive()
                            ? originalpattern.equals(currentelement)
                            : originalpattern.equalsIgnoreCase(currentelement);
                        if (included) {
                            accountForIncludedFile(currentPath, myfile);
                        }
                    }
                }
            }
        }
    }