org.pdfsam.console.utils.PdfUtility.java Source code

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Here is the source code for org.pdfsam.console.utils.PdfUtility.java

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/*
 * Created on 24-DEC-2008
 * Copyright (C) 2008 by Andrea Vacondio.
 *
 *
 * This library is provided under dual licenses.
 * You may choose the terms of the Lesser General Public License version 2.1 or the General Public License version 2
 * License at your discretion.
 * 
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * 
 * 
 * This program is free software; you can redistribute it and/or modify it under the terms of the 
 * GNU General Public License as published by the Free Software Foundation; 
 * either version 2 of the License.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 * See the GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License along with this program; 
 * if not, write to the Free Software Foundation, Inc., 
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package org.pdfsam.console.utils;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.util.List;

import org.dom4j.io.SAXReader;
import org.pdfsam.console.business.dto.PdfFile;

import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.RandomAccessFileOrArray;

/**
 * Utility class for pdf documents
 * 
 * @author Andrea Vacondio
 * 
 */
public final class PdfUtility {

    private PdfUtility() {
        // no contructor
    }

    /**
     * @param bookmarks
     *            the stream to read the xml. Stream is not closed.
     * @return the max depth of the bookmarks tree. 0 if no bookmark.
     */
    public static int getMaxBookmarksDepth(InputStream bookmarks) throws Exception {
        int retVal = 0;
        if (bookmarks != null) {
            SAXReader reader = new SAXReader();
            org.dom4j.Document document = reader.read(bookmarks);
            StringBuffer buffer = new StringBuffer("/Bookmark/Title[@Action=\"GoTo\"]");
            List nodes = document.selectNodes(buffer.toString());
            while ((nodes != null && nodes.size() > 0)) {
                retVal++;
                buffer.append("/Title[@Action=\"GoTo\"]");
                nodes = document.selectNodes(buffer.toString());
            }

        }
        return retVal;
    }

    public static PdfReader readerFor(PdfFile file)
            throws IOException, NoSuchFieldException, IllegalAccessException {
        PdfReader reader = new PdfReader(new RandomAccessFileOrArray(file.getFile().getAbsolutePath()),
                file.getPasswordBytes());
        unethical(reader);
        return reader;
    }

    public static PdfReader fullReaderFor(PdfFile file)
            throws IOException, NoSuchFieldException, IllegalAccessException {
        PdfReader reader = new PdfReader(new FileInputStream(file.getFile()), file.getPasswordBytes());
        unethical(reader);
        return reader;
    }

    private static void unethical(PdfReader reader) throws NoSuchFieldException, IllegalAccessException {
        if (!reader.isOpenedWithFullPermissions()) {
            Field field = reader.getClass().getDeclaredField("encrypted");
            field.setAccessible(true);
            field.setBoolean(reader, false);
        }
    }
}