private boolean findNextItem()

in commons-fileupload2-core/src/main/java/org/apache/commons/fileupload2/core/FileItemInputIteratorImpl.java [122:184]
59 lines of code
12 McCabe index (conditional complexity)

    private boolean findNextItem() throws FileUploadException, IOException {
        if (eof) {
            return false;
        }
        if (currentItem != null) {
            currentItem.close();
            currentItem = null;
        }
        final var multi = getMultiPartInput();
        for (;;) {
            final boolean nextPart;
            if (skipPreamble) {
                nextPart = multi.skipPreamble();
            } else {
                nextPart = multi.readBoundary();
            }
            if (!nextPart) {
                if (currentFieldName == null) {
                    // Outer multipart terminated -> No more data
                    eof = true;
                    return false;
                }
                // Inner multipart terminated -> Return to parsing the outer
                multi.setBoundary(multiPartBoundary);
                currentFieldName = null;
                continue;
            }
            final var headers = fileUpload.getParsedHeaders(multi.readHeaders());
            if (currentFieldName == null) {
                // We're parsing the outer multipart
                final var fieldName = fileUpload.getFieldName(headers);
                if (fieldName != null) {
                    final var subContentType = headers.getHeader(AbstractFileUpload.CONTENT_TYPE);
                    if (subContentType != null && subContentType.toLowerCase(Locale.ENGLISH).startsWith(AbstractFileUpload.MULTIPART_MIXED)) {
                        currentFieldName = fieldName;
                        // Multiple files associated with this field name
                        final var subBoundary = fileUpload.getBoundary(subContentType);
                        multi.setBoundary(subBoundary);
                        skipPreamble = true;
                        continue;
                    }
                    final var fileName = fileUpload.getFileName(headers);
                    currentItem = new FileItemInputImpl(this, fileName, fieldName, headers.getHeader(AbstractFileUpload.CONTENT_TYPE), fileName == null,
                            getContentLength(headers));
                    currentItem.setHeaders(headers);
                    progressNotifier.noteItem();
                    itemValid = true;
                    return true;
                }
            } else {
                final var fileName = fileUpload.getFileName(headers);
                if (fileName != null) {
                    currentItem = new FileItemInputImpl(this, fileName, currentFieldName, headers.getHeader(AbstractFileUpload.CONTENT_TYPE), false,
                            getContentLength(headers));
                    currentItem.setHeaders(headers);
                    progressNotifier.noteItem();
                    itemValid = true;
                    return true;
                }
            }
            multi.discardBodyData();
        }
    }