Nomad changes

docs/snippets/java/plugins/pdf_metadata_extractor.md

@@ -0,0 +1,50 @@
+```java title="Java"
+import dev.kreuzberg.Kreuzberg;
+import dev.kreuzberg.ExtractionResult;
+import dev.kreuzberg.PostProcessor;
+import dev.kreuzberg.KreuzbergException;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Logger;
+
+public class PdfMetadataExtractorExample {
+    private static final Logger logger = Logger.getLogger(
+        PdfMetadataExtractorExample.class.getName()
+    );
+
+    public static void main(String[] args) {
+        AtomicInteger processedCount = new AtomicInteger(0);
+
+        PostProcessor pdfMetadata = result -> {
+            if (!result.getMimeType().equals("application/pdf")) {
+                return result;
+            }
+
+            processedCount.incrementAndGet();
+
+            Map<String, Object> metadata = new HashMap<>(result.getMetadata());
+            metadata.put("pdf_processed", true);
+            metadata.put("processing_timestamp", System.currentTimeMillis());
+
+            logger.info("Processed PDF: " + processedCount.get());
+
+            return result;
+        };
+
+        try {
+            Kreuzberg.registerPostProcessor("pdf-metadata-extractor", pdfMetadata, 50);
+
+            logger.info("PDF metadata extractor initialized");
+
+            ExtractionResult result = Kreuzberg.extractFile("document.pdf");
+            System.out.println("PDF processed: " + result.getMetadata().get("pdf_processed"));
+
+            logger.info("Processed " + processedCount.get() + " PDFs");
+        } catch (IOException | KreuzbergException e) {
+            e.printStackTrace();
+        }
+    }
+}
+```