/*
* Copyright 2017 by Eduard Weissmann (edi.weissmann@gmail.com).
* This file is part of Sejda.
*
* Sejda 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.
*
* Sejda 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 Sejda. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sejda.impl.sambox;
import static org.sejda.common.ComponentsUtility.nullSafeCloseQuietly;
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 java.util.ArrayList;
import java.util.Collection;
import org.sejda.core.support.io.MultipleOutputWriter;
import org.sejda.core.support.io.OutputWriters;
import org.sejda.impl.sambox.component.DefaultPdfSourceOpener;
import org.sejda.impl.sambox.component.PDDocumentHandler;
import org.sejda.impl.sambox.component.PdfScaler;
import org.sejda.model.exception.TaskException;
import org.sejda.model.input.PdfSource;
import org.sejda.model.input.PdfSourceOpener;
import org.sejda.model.parameter.ResizePagesParameters;
import org.sejda.model.pdf.encryption.PdfAccessPermission;
import org.sejda.model.scale.ScaleType;
import org.sejda.model.task.BaseTask;
import org.sejda.model.task.TaskExecutionContext;
import org.sejda.sambox.pdmodel.PDPage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* SAMBox implementation of a task that can resize pages or add page margins
*
* @author Eduard Weissmann
*
*/
public class ResizePagesTask extends BaseTask<ResizePagesParameters> {
private static final Logger LOG = LoggerFactory.getLogger(ResizePagesTask.class);
private int totalSteps;
private PDDocumentHandler documentHandler = null;
private MultipleOutputWriter outputWriter;
private PdfSourceOpener<PDDocumentHandler> documentLoader;
@Override
public void before(ResizePagesParameters parameters, TaskExecutionContext executionContext) throws TaskException {
super.before(parameters, executionContext);
totalSteps = parameters.getSourceList().size();
documentLoader = new DefaultPdfSourceOpener();
outputWriter = OutputWriters.newMultipleOutputWriter(parameters.getExistingOutputPolicy(), executionContext);
}
@Override
public void execute(ResizePagesParameters parameters) throws TaskException {
int currentStep = 0;
for (PdfSource<?> source : parameters.getSourceList()) {
executionContext().assertTaskNotCancelled();
currentStep++;
LOG.debug("Opening {}", source);
try {
documentHandler = source.open(documentLoader);
documentHandler.getPermissions().ensurePermission(PdfAccessPermission.MODIFY);
documentHandler.setCreatorOnPDDocument();
File tmpFile = createTemporaryBuffer(parameters.getOutput());
LOG.debug("Created output on temporary buffer {}", tmpFile);
Collection<PDPage> pages = new ArrayList<>();
if(parameters.getPageSelection().isEmpty()) {
// all pages
for(PDPage p : documentHandler.getPages()) {
pages.add(p);
}
} else {
// specific pages
for(int pageNumber: parameters.getPages(documentHandler.getNumberOfPages())){
pages.add(documentHandler.getPage(pageNumber));
}
}
if(parameters.getMargin() != 0){
LOG.debug("Adding margins of {} inch to {} pages", parameters.getMargin(), pages.size());
for(PDPage page: pages) {
float currentWidth = page.getCropBox().getWidth();
double marginWidth = parameters.getMargin() * 72 /* to points */;
double targetWidth = currentWidth - marginWidth;
double scale = targetWidth / currentWidth;
PdfScaler scaler = new PdfScaler(ScaleType.CONTENT);
scaler.scale(documentHandler.getUnderlyingPDDocument(), page, scale);
}
}
if(parameters.getPageSizeWidth() != 0) {
float targetWidth = (float) (parameters.getPageSizeWidth() * 72) /* to points */;
LOG.debug("Resizing {} pages to match width of {} inch", pages.size(), targetWidth);
PdfScaler scaler = new PdfScaler(ScaleType.PAGE);
scaler.resizePages(documentHandler.getUnderlyingPDDocument(), pages, targetWidth);
}
documentHandler.setVersionOnPDDocument(parameters.getVersion());
documentHandler.setCompress(parameters.isCompress());
documentHandler.savePDDocument(tmpFile);
String outName = nameGenerator(parameters.getOutputPrefix())
.generate(nameRequest().originalName(source.getName()).fileNumber(currentStep));
outputWriter.addOutput(file(tmpFile).name(outName));
} finally {
nullSafeCloseQuietly(documentHandler);
}
notifyEvent(executionContext().notifiableTaskMetadata()).stepsCompleted(currentStep).outOf(totalSteps);
}
parameters.getOutput().accept(outputWriter);
LOG.debug("Input documents scaled and written to {}", parameters.getOutput());
}
@Override
public void after() {
nullSafeCloseQuietly(documentHandler);
}
}