org.nuxeo.typeDocPkg.PdfDoc.java Source code

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Here is the source code for org.nuxeo.typeDocPkg.PdfDoc.java

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/*
 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Contributors:
 *     Davide Taibi & Antonio Urso
 *     Universit dell'Insubria
 */

package org.nuxeo.typeDocPkg;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import org.apache.pdfbox.cos.COSDocument;
import org.apache.pdfbox.pdfparser.PDFParser;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.util.PDFTextStripper;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Handle a pdf documents.
 *
 * @author Antonio Urso
 */
public class PdfDoc implements GenericDoc {
    private static final Log log = LogFactory.getLog(PdfDoc.class);
    private PDFParser parser;
    private String parsedText = null;;
    private PDFTextStripper pdfStripper = null;
    private PDDocument pdDoc = null;
    private COSDocument cosDoc = null;
    private File file;
    Integer currentPage = 1;

    private boolean setMain(String FileName) throws Exception {
        file = new File(FileName);
        if (!file.isFile()) {
            System.err.println("File " + "output.pdf" + " does not exist.");
            return false;
        }
        try {
            parser = new PDFParser(new FileInputStream(file));
        } catch (IOException e) {
            log.error("Unable to open PDF Parser. ", e);
            return false;
        }

        try {
            parser.parse();
            cosDoc = parser.getDocument();
            pdfStripper = new PDFTextStripper();
            pdDoc = new PDDocument(cosDoc);
        } catch (Exception e) {
            log.error("error in setMain method ", e);
            return false;
        }

        return true;
    }

    /**
      * set the number page of document.
      *
      * @param page
      *             number of page
      *
      */
    public void setpage(Integer page) throws Exception {
        currentPage = page;
    }

    /**
    * return a number of page of document.
    *
    * @param FileName
    *             name of the file
    * @return number of pages
    */
    public Integer NrPages(String FileName) {
        try {
            setMain(FileName);
            return pdDoc.getNumberOfPages();
        } catch (Exception e) {
            log.error("Error during the NrPages method: ", e);
            return 1;
        }
    }

    /**
      * return a text of the document.
      *
      * @param fileName
      *             nome of file
      * @return text of the page
      */
    public String ExtractStrFromDoc(String fileName) throws Exception {
        try {
            setMain(fileName);
            pdfStripper.setStartPage(currentPage);
            pdfStripper.setEndPage(currentPage);
            parsedText = pdfStripper.getText(pdDoc);
        } catch (Exception e) {
            log.error("An exception occured in parsing the PDF Document. ", e);
            return "";
        } finally {
            try {
                if (cosDoc != null) {
                    cosDoc.close();
                }
                if (pdDoc != null) {
                    pdDoc.close();
                }
                return parsedText;
            } catch (Exception e) {
                log.error("Error during the setPageNr method: ", e);
            }
        }
        return parsedText;
    }

}