List of usage examples for org.apache.pdfbox.cos COSArray iterator
@Override
public Iterator<COSBase> iterator()
From source file:com.aaasec.sigserv.csspsupport.pdfbox.modifications.CsCOSWriter.java
License:Apache License
/** * visitFromArray method comment.//w w w. j ava 2s . c o m * * @param obj The object that is being visited. * * @throws COSVisitorException If there is an exception while visiting this * object. * * @return null */ public Object visitFromArray(COSArray obj) throws COSVisitorException { try { int count = 0; getStandardOutput().write(ARRAY_OPEN); for (Iterator<COSBase> i = obj.iterator(); i.hasNext();) { COSBase current = i.next(); if (current instanceof COSDictionary) { addObjectToWrite(current); writeReference(current); } else if (current instanceof COSObject) { COSBase subValue = ((COSObject) current).getObject(); if (subValue instanceof COSDictionary || subValue == null) { addObjectToWrite(current); writeReference(current); } else { subValue.accept(this); } } else if (current == null) { COSNull.NULL.accept(this); } else if (current instanceof COSString) { COSString copy = new COSString(((COSString) current).getString()); copy.accept(this); } else { current.accept(this); } count++; if (i.hasNext()) { if (count % 10 == 0) { getStandardOutput().writeEOL(); } else { getStandardOutput().write(SPACE); } } } getStandardOutput().write(ARRAY_CLOSE); getStandardOutput().writeEOL(); return null; } catch (IOException e) { throw new COSVisitorException(e); } }
From source file:com.esri.geoportal.commons.pdf.PdfUtils.java
License:Apache License
/** * Extracts the geospatial metadata from a GeoPDF * // w w w. ja v a 2s . c om * @param page the PDF page to read geospatial metadata from * @param geometryServiceUrl url of a <a href="https://developers.arcgis.com/rest/services-reference/geometry-service.htm">geometry service</a> for reprojecting coordinates. * * @see <a href="https://www.loc.gov/preservation/digital/formats/fdd/fdd000312.shtml">Library of Congress information on GeoPDF</a> * @see <a href="https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf">The PDF specification</a>, section 8, for instructions for translating coordinates. * * @returns the bounding box of the GeoPDF as "yMin xMin, yMax xMax" */ private static String extractGeoPDFProps(PDPage page, String geometryServiceUrl) { // The LGI dictionary is an array, we'll loop through all entries and pull the first one for a bounding box COSArray lgi = (COSArray) page.getCOSObject().getDictionaryObject("LGIDict"); List<String> bBoxes = new ArrayList<>(); lgi.iterator().forEachRemaining(item -> { String currentBbox = null; // Set up the Coordinate Transformation Matrix (used to translate PDF coords to geo coords) Double[][] ctmValues = null; COSDictionary dictionary = (COSDictionary) item; if (dictionary.containsKey("CTM")) { ctmValues = new Double[3][3]; // The last column in the matrix is always constant ctmValues[0][2] = 0.0; ctmValues[1][2] = 0.0; ctmValues[2][2] = 1.0; COSArray ctm = (COSArray) dictionary.getDictionaryObject("CTM"); for (int i = 0; i < ctm.toList().size(); i += 2) { int ctmRow = i / 2; ctmValues[ctmRow][0] = Double.parseDouble(((COSString) ctm.get(i)).getString()); ctmValues[ctmRow][1] = Double.parseDouble(((COSString) ctm.get(i + 1)).getString()); } } // Get the neatline (i.e. the bounding box in *PDF* coordinates) Double[][] neatLineValues = null; int neatLineLength = 0; if (dictionary.containsKey("Neatline")) { COSArray neatline = (COSArray) dictionary.getDictionaryObject("Neatline"); neatLineLength = neatline.toList().size(); neatLineValues = new Double[neatLineLength / 2][3]; for (int i = 0; i < neatline.toList().size(); i += 2) { int neatLineRow = i / 2; neatLineValues[neatLineRow][0] = Double.parseDouble(((COSString) neatline.get(i)).getString()); neatLineValues[neatLineRow][1] = Double .parseDouble(((COSString) neatline.get(i + 1)).getString()); neatLineValues[neatLineRow][2] = 1.0; } } // Translate the PDF coordinates to Geospatial coordintates by multiplying the two matricies MultiPoint mp = new MultiPoint(); if (ctmValues != null && neatLineValues != null) { Double[][] resultCoords = new Double[neatLineLength / 2][3]; for (int z = 0; z < neatLineLength / 2; z++) { for (int i = 0; i < 3; i++) { resultCoords[z][i] = neatLineValues[z][0] * ctmValues[0][i] + neatLineValues[z][1] * ctmValues[1][i] + neatLineValues[z][2] * ctmValues[2][i]; } mp.add(resultCoords[z][0], resultCoords[z][1]); } } // Project the geospatial coordinates to WGS84 for the Dublin-Core metadata if (dictionary.containsKey("Projection")) { COSDictionary projectionDictionary = (COSDictionary) dictionary.getDictionaryObject("Projection"); String projectionType = projectionDictionary.getString("ProjectionType"); try (GeometryService svc = new GeometryService(HttpClients.custom().useSystemProperties().build(), new URL(geometryServiceUrl));) { // UTM projections require slightly different processing if ("UT".equals(projectionType)) { String zone = Integer.toString(projectionDictionary.getInt("Zone")); String hemisphere = projectionDictionary.getString("Hemisphere"); // Get the wkt for the geospatial coordinate system String wkt = datumTranslation(projectionDictionary.getItem("Datum")); if (zone != null && hemisphere != null && wkt != null) { // Generate a list of UTM strings List<String> utmCoords = new ArrayList<>(); for (Point2D pt : mp.getCoordinates2D()) { String coord = String.format("%s%s %s %s", zone, hemisphere, Math.round(pt.x), Math.round(pt.y)); utmCoords.add(coord); } MultiPoint reproj = svc.fromGeoCoordinateString(utmCoords, WGS84_WKID); currentBbox = generateBbox(reproj); } else { LOG.warn("Missing UTM argument: zone: {}, hemisphere: {}, datum: {}", zone, hemisphere, wkt); LOG.debug("Projection dictionary {}", projectionDictionary); } } else { // Generate Well Known Text for projection and re-projects the points to WGS 84 String wkt = getProjectionWKT(projectionDictionary, projectionType); if (wkt != null) { MultiPoint reproj = svc.project(mp, wkt, WGS84_WKID); currentBbox = generateBbox(reproj); } else if (LOG.isDebugEnabled()) { // Print out translated coordinates for debugging purposes LOG.debug("Translated Coordinates"); for (Point2D pt : mp.getCoordinates2D()) { LOG.debug(String.format("\t%s, %s", pt.x, pt.y)); } } } } catch (Exception e) { // If something goes wrong, just try the next set of coordinates LOG.error("Exception reprojecting geometry, skipping this geopdf dictionary instance...", e); } } if (currentBbox != null) { bBoxes.add(currentBbox); } }); return bBoxes.get(0); }