at.laborg.briss.utils.ClusterCreator.java Source code

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Here is the source code for at.laborg.briss.utils.ClusterCreator.java

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// $Id: SingleCluster.java 55 2011-02-22 21:45:59Z laborg $
/**
 * Copyright 2010 Gerhard Aigner
 * 
 * This file is part of BRISS.
 * 
 * BRISS 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 3 of the License, or (at your option) any later
 * version.
 * 
 * BRISS 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
 * BRISS. If not, see http://www.gnu.org/licenses/.
 */
package at.laborg.briss.utils;

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

import at.laborg.briss.model.ClusterDefinition;
import at.laborg.briss.model.PageCluster;
import at.laborg.briss.model.PageExcludes;

import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfReader;

public final class ClusterCreator {
    private ClusterCreator() {
    };

    public static ClusterDefinition clusterPages(final File source, final PageExcludes pageExcludes)
            throws IOException {
        PdfReader reader = new PdfReader(source.getAbsolutePath());

        ClusterDefinition clusters = new ClusterDefinition();

        for (int page = 1; page <= reader.getNumberOfPages(); page++) {

            Rectangle layoutBox = getLayoutBox(reader, page);

            // create Cluster
            // if the pagenumber should be excluded then use it as a
            // discriminating parameter, else use default value

            boolean excluded = checkExclusionAndGetPageNumber(pageExcludes, page);

            PageCluster tmpCluster = new PageCluster(page % 2 == 0, (int) layoutBox.getWidth(),
                    (int) layoutBox.getHeight(), excluded, page);

            clusters.addOrMergeCluster(tmpCluster);
        }
        reader.close();
        clusters.selectAndSetPagesForMerging();
        return clusters;
    }

    private static Rectangle getLayoutBox(final PdfReader reader, final int page) {
        Rectangle layoutBox = reader.getBoxSize(page, "crop");

        if (layoutBox == null) {
            layoutBox = reader.getBoxSize(page, "media");
        }
        return layoutBox;
    }

    private static boolean checkExclusionAndGetPageNumber(final PageExcludes pageExcludes, final int page) {
        return (pageExcludes != null && pageExcludes.containsPage(page));
    }
}