/*
* This file is part of the Sejda source code
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sejda.impl.sambox.component.split;
import static org.sejda.core.notification.dsl.ApplicationEventsNotifier.notifyEvent;
import static org.sejda.core.support.io.IOUtils.createTemporaryBuffer;
import static org.sejda.core.support.io.model.FileOutput.file;
import static org.sejda.core.support.prefix.NameGenerator.nameGenerator;
import static org.sejda.core.support.prefix.model.NameGenerationRequest.nameRequest;
import java.io.File;
import org.sejda.core.support.io.MultipleOutputWriter;
import org.sejda.core.support.io.OutputWriters;
import org.sejda.impl.sambox.component.PagesExtractor;
import org.sejda.impl.sambox.component.optimization.OptimizationRuler;
import org.sejda.model.exception.TaskException;
import org.sejda.model.exception.TaskExecutionException;
import org.sejda.model.input.PdfSource;
import org.sejda.model.outline.OutlineExtractPageDestinations;
import org.sejda.model.parameter.ExtractByOutlineParameters;
import org.sejda.model.task.TaskExecutionContext;
import org.sejda.sambox.pdmodel.PDDocument;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Extracts separate docs based on selected outline page sections
*/
public class PageDestinationsLevelPdfExtractor {
private static final Logger LOG = LoggerFactory.getLogger(PageDestinationsLevelPdfExtractor.class);
private final OutlineExtractPageDestinations outlineDestinations;
private final ExtractByOutlineParameters parameters;
private final PDDocument document;
private MultipleOutputWriter outputWriter;
private final PdfSource<?> source;
public PageDestinationsLevelPdfExtractor(PDDocument document, ExtractByOutlineParameters parameters,
OutlineExtractPageDestinations outlineDestinations, PdfSource<?> source) {
this.outlineDestinations = outlineDestinations;
this.parameters = parameters;
this.document = document;
this.source = source;
}
public void extract(TaskExecutionContext executionContext) throws TaskException {
int outputDocumentsCounter = 0;
this.outputWriter = OutputWriters.newMultipleOutputWriter(parameters.getExistingOutputPolicy(),
executionContext);
try (PagesExtractor extractor = new PagesExtractor(document)) {
int totalExtractions = outlineDestinations.sections.size();
if (totalExtractions == 0) {
throw new TaskExecutionException("No page has been selected for extraction.");
}
boolean optimize = new OptimizationRuler(parameters.getOptimizationPolicy()).apply(document);
for (int s = 0; s < totalExtractions; s++) {
executionContext.assertTaskNotCancelled();
OutlineExtractPageDestinations.OutlineItemBoundaries section = outlineDestinations.sections.get(s);
// open
int page = section.startPage;
LOG.debug("Starting extracting {} pages {} {}", section.title, section.startPage, section.endPage);
outputDocumentsCounter++;
File tmpFile = createTemporaryBuffer(parameters.getOutput());
LOG.debug("Created output temporary buffer {}", tmpFile);
String outName = nameGenerator(parameters.getOutputPrefix())
.generate(nameRequest().page(page).originalName(source.getName())
.fileNumber(outputDocumentsCounter).bookmark(section.title));
outputWriter.addOutput(file(tmpFile).name(outName));
for (; page <= section.endPage; page++) {
executionContext.assertTaskNotCancelled();
// retain
LOG.trace("Retaining page {} of the original document", page);
extractor.retain(page, executionContext);
}
// close
extractor.setVersion(parameters.getVersion());
extractor.setCompress(parameters.isCompress());
if (optimize) {
extractor.optimize();
}
extractor.save(tmpFile, parameters.discardOutline());
extractor.reset();
LOG.debug("Ending extracting {}", section.title);
notifyEvent(executionContext.notifiableTaskMetadata()).stepsCompleted(s).outOf(totalExtractions);
}
}
parameters.getOutput().accept(outputWriter);
}
}