org.apache.james.mailbox.store.search.PDFTextExtractor.java Source code

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Here is the source code for org.apache.james.mailbox.store.search.PDFTextExtractor.java

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package org.apache.james.mailbox.store.search;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Optional;

import org.apache.commons.io.IOUtils;
import org.apache.james.mailbox.extractor.ParsedContent;
import org.apache.james.mailbox.extractor.TextExtractor;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.text.PDFTextStripper;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;

public class PDFTextExtractor implements TextExtractor {

    static final String PDF_TYPE = "application/pdf";

    @Override
    public ParsedContent extractContent(InputStream inputStream, String contentType) throws Exception {
        Preconditions.checkNotNull(inputStream);
        Preconditions.checkNotNull(contentType);

        if (isPDF(contentType)) {
            return extractTextFromPDF(inputStream);
        }
        return new ParsedContent(Optional.ofNullable(IOUtils.toString(inputStream, StandardCharsets.UTF_8)),
                ImmutableMap.of());
    }

    private boolean isPDF(String contentType) {
        return contentType.equals(PDF_TYPE);
    }

    private ParsedContent extractTextFromPDF(InputStream inputStream) throws IOException {
        return new ParsedContent(Optional.ofNullable(new PDFTextStripper().getText(PDDocument.load(inputStream))),
                ImmutableMap.of());
    }
}