message = (
            f"Duplicate Operation ID {operation_id} for function "
            + f"{route.endpoint.__name__}"
        )
        file_name = getattr(route.endpoint, "__globals__", {}).get("__file__")
        if file_name:
            message += f" at {file_name}"
        warnings.warn(message, stacklevel=1)
    operation_ids.add(operation_id)
    operation["operationId"] = operation_id
    if route.deprecated:

        String fileName = form.designFileName;
        if (StringUtil.isBlank(fileName)) {
            fileName = uploadedFileName;
            try {
                int pos = fileName.indexOf('/');
                if (pos >= 0) {
                    fileName = fileName.substring(pos + 1);
                }
                pos = fileName.indexOf('\\');
                if (pos >= 0) {

            "user": {"username": "johndoe", "full_name": "John Doe"},
        },
    )
    assert response.status_code == 200
    assert response.json() == {
        "item_id": 5,
        "item": {
            "name": "Foo",
            "price": 50.5,
            "description": "Some Foo",
            "tax": 0.1,
        },
        "user": {"username": "johndoe", "full_name": "John Doe"},
    }

- Special character handling
- Input stream validation (not consumption)
- Edge cases (long filenames, paths, whitespace)

**Test Count**: 10 tests

**Key Scenarios**:
- ✅ Valid filename extraction
- ✅ Null parameters handling
- ✅ Empty/missing resource name
- ✅ Special characters in filename (Japanese, paths)
- ✅ Input stream not consumed (only validated)
- ✅ Whitespace and empty string handling

---

        final int fileType;
        if (fileName.startsWith("system") && fileName.endsWith(".properties")) {
            fileType = 1;
        } else if (fileName.startsWith("gsa") && fileName.endsWith(".xml")) {
            fileType = 2;
        } else if (fileName.endsWith(".bulk")) {
            fileType = 3;
        } else if (fileName.startsWith("fess") && fileName.endsWith(".json")) {

        params.put(ExtractData.RESOURCE_NAME_KEY, "filename.txt");

        final ExtractData result = filenameExtractor.getText(in, params);

        assertNotNull(result);
        assertEquals("filename.txt", result.getContent());
        // Verify stream was not consumed
        assertEquals(testData.length, in.available());
    }

    /**
     * Test extraction with empty string filename.
     */

    }

    /**
     * Normalizes the filename by replacing special characters.
     * @param filename The filename to normalize.
     * @return The normalized filename.
     */
    protected String normalizeFilename(final String filename) {
        if (StringUtil.isBlank(filename)) {
            return filename;
        }
        final StringBuilder buf = new StringBuilder(filename.length() + 10);

/**
 * Extracts the filename from the parameters as the content.
 *
 * <p>This extractor is useful when you want to index only the filename or resource name
 * without processing the actual file content. The input stream is validated but not
 * read - only the filename from the parameters is used as the extracted content.</p>
 *
 * <p>The filename is retrieved from the {@link ExtractData#RESOURCE_NAME_KEY} parameter.

    /**
     * Creates an artifact instance from a filename.
     *
     * @param artifactType the type of the artifact
     * @param filename the filename to parse
     * @return an artifact instance
     */
    protected Artifact getArtifactFromFileName(final ArtifactType artifactType, final String filename) {
        return getArtifactFromFileName(artifactType, filename, null);
    }

    /**

                            <div class="card-body">
                                <div class="form-group row">
                                    <la:errors property="fileName"/>
                                    <la:select styleId="fileName" property="fileName" styleClass="form-control">
                                        <c:forEach var="item" varStatus="s" items="${fileNameItems}">