39 lines
1.3 KiB
Markdown
39 lines
1.3 KiB
Markdown
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```kotlin title="Kotlin"
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import dev.kreuzberg.*
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import java.util.concurrent.atomic.AtomicInteger
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class PdfMetadataExtractor : IPostProcessor {
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private val processed = AtomicInteger(0)
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override fun name(): String = "pdf-metadata-extractor"
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override fun version(): String = "1.0.0"
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override fun process(result: ExtractionResult, config: ExtractionConfig) {
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if (result.mimeType() != "application/pdf") return
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val count = processed.incrementAndGet()
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val metadata: Metadata = result.metadata()
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// Metadata is an immutable record — read PDF metadata fields rather
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// than mutate. Reporting via stdout/log keeps the snippet honest.
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println(
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"[pdf-metadata] #$count title=${metadata.title()} authors=${metadata.authors()}",
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)
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}
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override fun processing_stage(): ProcessingStage = ProcessingStage.Late
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override fun should_process(
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_result: ExtractionResult,
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_config: ExtractionConfig,
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): Boolean = _result.mimeType() == "application/pdf"
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override fun estimated_duration_ms(_result: ExtractionResult): Long = 2L
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override fun priority(): Int = 25
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}
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fun registerPdfMetadataExtractor() {
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PostProcessorBridge.registerPostProcessor(PdfMetadataExtractor())
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}
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```
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