at.knowcenter.wag.egov.egiz.pdfbox2.pdf.PDFPage.java Source code

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/*******************************************************************************
 * <copyright> Copyright 2014 by E-Government Innovation Center EGIZ, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/
/**
 * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *
 * $Id: PDFPage.java,v 1.5 2006/10/31 08:09:33 wprinz Exp $
 */
package at.knowcenter.wag.egov.egiz.pdfbox2.pdf;

import java.awt.Rectangle;
import java.awt.geom.GeneralPath;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.math.NumberUtils;
import org.apache.pdfbox.contentstream.operator.Operator;
import org.apache.pdfbox.contentstream.operator.OperatorProcessor;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.common.PDStream;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.graphics.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotation;
import org.apache.pdfbox.text.PDFTextStripper;
import org.apache.pdfbox.text.TextPosition;
import org.apache.pdfbox.util.Matrix;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.knowcenter.wag.egov.egiz.pdf.Pos;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.construction.ClosePath;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.construction.CurveTo;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.construction.CurveToReplicateFinalPoint;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.construction.CurveToReplicateInitialPoint;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.construction.LineTo;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.construction.MoveTo;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.painting.CloseAndStrokePath;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.painting.CloseFillEvenOddAndStrokePath;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.painting.CloseFillNonZeroAndStrokePath;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.painting.EndPath;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.painting.FillEvenOddAndStrokePath;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.painting.FillNonZeroAndStrokePath;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.painting.FillPathEvenOddRule;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.painting.FillPathNonZeroWindingNumberRule;
import at.knowcenter.wag.egov.egiz.pdfbox2.pdf.operator.path.painting.StrokePath;

/**
 * PDFPage is an inner class that is used to calculate the page length of a PDF
 * Document page. It extends the PDFTextStripper class and implement one
 * interested method:
 * {@link at.knowcenter.wag.egov.egiz.pdfbox2.pdf.PDFPage#showCharacter(TextPosition)}<br>
 * This method is called when processing the FileStream. By calling the method
 * {@link org.apache.pdfbox.util.PDFStreamEngine#processStream(org.apache.pdfbox.pdmodel.PDPage, org.apache.pdfbox.pdmodel.PDResources, org.pdfbox.cos.COSStream)}
 * the implemented method showCharacter is called.
 * 
 * @author wlackner
 * @see PDFTextStripper
 */
public class PDFPage extends PDFTextStripper {
    /**
     * The logger definition.
     */
    private static final Logger logger = LoggerFactory.getLogger(PDFPage.class);

    /**
     * The maximum (lowest) y position of a character.
     */
    protected float max_character_ypos = Float.NEGATIVE_INFINITY;

    /**
     * The maximum (lowest y position of an image.
     */
    protected float max_image_ypos = Float.NEGATIVE_INFINITY;

    /**
     * The effective page height.
     */
    protected float effectivePageHeight;

    /**
     * The path currently being constructed.
     */
    private GeneralPath currentPath = new GeneralPath();

    private boolean legacy40;

    /**
     * The lowest position of a drawn path (originating from top).
     */
    private float maxPathRelatedYPositionFromTop = Float.NEGATIVE_INFINITY;

    /**
     * Constructor.
     * 
     * @param effectivePageHeight
     *            The height of the page to be evaluated. PDF elements outside
     *            this height will not be considered.
     * 
     * @throws java.io.IOException
     */
    public PDFPage(float effectivePageHeight, boolean legacy32, boolean legacy40) throws IOException {
        super();

        this.legacy40 = legacy40;

        this.effectivePageHeight = effectivePageHeight;

        OperatorProcessor newInvoke = new MyInvoke(this);
        newInvoke.setContext(this);
        this.registerOperatorProcessor("Do", newInvoke);

        if (!legacy32) {
            registerCustomPathOperators();
        }
    }

    /**
     * Registers operators responsible for path construction and painting in
     * order to fix auto positioning on pages with path elements.
     * 
     * @author Datentechnik Innovation GmbH
     */
    private void registerCustomPathOperators() {

        // *** path construction
        this.registerOperatorProcessor("m", new MoveTo(this));
        this.registerOperatorProcessor("l", new LineTo(this));
        this.registerOperatorProcessor("c", new CurveTo(this));
        this.registerOperatorProcessor("y", new CurveToReplicateFinalPoint(this));
        this.registerOperatorProcessor("v", new CurveToReplicateInitialPoint(this));
        this.registerOperatorProcessor("h", new ClosePath(this));

        // *** path painting

        // "S": stroke path
        this.registerOperatorProcessor("S", new StrokePath(this));
        this.registerOperatorProcessor("s", new CloseAndStrokePath(this));
        this.registerOperatorProcessor("f", new FillPathNonZeroWindingNumberRule(this));
        this.registerOperatorProcessor("F", new FillPathNonZeroWindingNumberRule(this));
        this.registerOperatorProcessor("f*", new FillPathEvenOddRule(this));
        this.registerOperatorProcessor("b", new CloseFillNonZeroAndStrokePath(this));
        this.registerOperatorProcessor("B", new FillNonZeroAndStrokePath(this));
        this.registerOperatorProcessor("b*", new CloseFillEvenOddAndStrokePath(this));
        this.registerOperatorProcessor("B*", new FillEvenOddAndStrokePath(this));
        this.registerOperatorProcessor("n", new EndPath(this));

        // Note: The graphic context
        // (org.pdfbox.pdmodel.graphics.PDGraphicsState) of the underlying
        // pdfbox library does
        // not yet support clipping. This prevents feasible usage of clipping
        // operators (W, W*).
        // operators.put("W", new ...(this));
        // operators.put("W*", new ...(this));

    }

    /**
     * Returns the path currently being constructed.
     * 
     * @return The path currently being constructed.
     */
    public GeneralPath getCurrentPath() {
        return currentPath;
    }

    /**
     * Sets the current path.
     * 
     * @param currentPath
     *            The new current path.
     */
    public void setCurrentPath(GeneralPath currentPath) {
        this.currentPath = currentPath;
    }

    /**
     * Registers a rectangle that bounds the path currently being drawn.
     * 
     * @param bounds
     *            A rectangle depicting the bounds (coordinates originating from
     *            bottom left).
     * @author Datentechnik Innovation GmbH
     */
    public void registerPathBounds(Rectangle bounds) {
        if (!bounds.isEmpty()) {
            logger.debug("Registering path bounds: " + bounds);

            // vertical start of rectangle (counting from top of page)
            float upperBoundYPositionFromTop;

            // vertical end of rectangle (counting from top of page)
            // this depicts the current end of path-related page content
            float lowerBoundYPositionFromTop;

            PDRectangle boundaryBox = this.getCurrentPage().getCropBox();

            if (boundaryBox == null) {
                boundaryBox = this.getCurrentPage().getMediaBox();
            }

            float pageHeight;

            switch (this.getCurrentPage().getRotation()) {
            case 90: // CW
                pageHeight = boundaryBox.getWidth();
                upperBoundYPositionFromTop = (float) bounds.getMinX();
                lowerBoundYPositionFromTop = (float) bounds.getMaxX();
                break;
            case 180:
                pageHeight = boundaryBox.getHeight();
                upperBoundYPositionFromTop = (float) bounds.getMinY();
                lowerBoundYPositionFromTop = (float) bounds.getMaxY();
                break;
            case 270: // CCW
                pageHeight = boundaryBox.getWidth();
                upperBoundYPositionFromTop = pageHeight - (float) bounds.getMaxX();
                lowerBoundYPositionFromTop = pageHeight - (float) bounds.getMinX();
                break;
            default:
                pageHeight = boundaryBox.getHeight();
                upperBoundYPositionFromTop = pageHeight - (float) bounds.getMaxY();
                lowerBoundYPositionFromTop = pageHeight - (float) bounds.getMinY();
                break;
            }

            // new maximum ?
            if (lowerBoundYPositionFromTop > maxPathRelatedYPositionFromTop) {
                // Is the rectangle (at least partly) located above the footer
                // line?
                // (effective page height := page height - footer line)
                if (upperBoundYPositionFromTop <= effectivePageHeight) {
                    // yes: update current end of path-related page content
                    maxPathRelatedYPositionFromTop = lowerBoundYPositionFromTop;
                    logger.trace("New max path related y position (from top): " + maxPathRelatedYPositionFromTop);
                } else {
                    // no: rectangle is fully located below the footer line ->
                    // ignore
                    logger.trace("Ignoring path bound below the footer line.");
                }
            }
        }
    }

    protected void processOperator(Operator operator, List<COSBase> arguments) throws IOException {
        logger.trace("operator = " + operator);
        super.processOperator(operator, arguments);
    }

    @Override
    protected void processTextPosition(TextPosition text) {
        showCharacter(text);
    }

    // exthex
    /**
     * A method provided as an event interface to allow a subclass to perform
     * some specific functionality when a character needs to be displayed. This
     * method is used to calculate the latest position of a text in the page.
     * Sorry for this missinterpretation of the method, but it is the only way
     * to do this (provided by PDFBox)!!!
     * 
     * @param text
     *            the character to be displayed -> calculate there y position.
     */
    protected void showCharacter(TextPosition text) {
        float current_y = text.getY();
        final String character = text.toString();

        if (at.gv.egiz.pdfas.common.utils.StringUtils.whiteSpaceTrim(character).isEmpty()) {
            return;
        }

        int pageRotation = this.getCurrentPage().getRotation();
        // logger_.debug("PageRotation = " + pageRotation);
        /*if (pageRotation == 0) {
           current_y = text.getY();
        }
        if (pageRotation == 90) {
           current_y = text.getY();
        }
        if (pageRotation == 180) {
           current_y = text.getY();
        }
        if (pageRotation == 270) {
           current_y = text.getY();
        }
            
        if (current_y > this.effectivePageHeight) {
           this.max_character_ypos = this.effectivePageHeight;
           return;
        }
            
        // store ypos of the char if it is not empty
        if (current_y > this.max_character_ypos) {
           this.max_character_ypos = current_y;
        }*/

        if (pageRotation == 0) {
            current_y = text.getY();
        }
        if (pageRotation == 90) {
            current_y = text.getX();
        }
        if (pageRotation == 180) {
            float page_height = this.getCurrentPage().getMediaBox().getHeight();
            current_y = page_height - text.getY();
        }
        if (pageRotation == 270) {
            float page_height = this.getCurrentPage().getMediaBox().getHeight();
            current_y = page_height - text.getX();
        }

        if (current_y > this.effectivePageHeight) {
            // logger_.debug("character is below footer_line. footer_line = " +
            // this.footer_line + ", text.character=" + character + ", y=" +
            // current_y);
            return;
        }

        // store ypos of the char if it is not empty
        if (current_y > this.max_character_ypos) {
            this.max_character_ypos = current_y;
        }
    }

    // use this funtion getting an unsorted text output
    // public void showString(byte[] string) {
    // logger_.debug(new String(string));
    // }

    /**
     * Returns the calculated page length.
     * 
     * @return the max page length value
     */
    public float getMaxPageLength() {
        if (logger.isDebugEnabled()) {
            logger.debug("Determining page content length: text=" + max_character_ypos + ", image=" + max_image_ypos
                    + ", path=" + maxPathRelatedYPositionFromTop);
        }
        return NumberUtils.max(max_character_ypos, max_image_ypos, maxPathRelatedYPositionFromTop);
    }

    //   public Map<String, PDFont> getFonts() { //TODO: pdfbox2 - was @override
    //
    //      COSBase fontObj = null;
    //
    //      if (getCurrentPage().getResources() != null
    //            && getCurrentPage().getResources().getCOSObject() != null
    //            && getCurrentPage().getResources().getCOSObject()
    //                  .getDictionaryObject(COSName.FONT) != null) {
    //         fontObj = getCurrentPage().getResources().getCOSObject()
    //               .getDictionaryObject(COSName.FONT);
    //      }
    //      
    //      Map<String, PDFont> fontMap = new HashMap<String, PDFont>();
    //      
    //      Iterable<COSName> fontNames = getCurrentPage().getResources().getFontNames();
    //      for(COSName fn : fontNames){
    //         fontMap.put(fn.getName(), getCurrentPage().getResources().getFont(fn));
    //      }
    //      
    //      if (fontObj != null) {
    //         getCurrentPage().getResources().getCOSObject()
    //               .setItem(COSName.FONT, fontObj);
    //      }
    //      
    //      return fontMap;
    //   }

    public class MyInvoke extends OperatorProcessor {

        private PDFPage mypage;

        public MyInvoke(PDFPage page) {
            this.mypage = page;
        }

        public void process(Operator operator, List<COSBase> arguments) throws IOException {
            COSName name = (COSName) arguments.get(0);

            // PDResources res = context.getResources();

            PDXObject xobject = context.getResources().getXObject(name);

            PDStream stream = xobject.getPDStream();
            COSStream cos_stream = stream.getStream();

            COSName subtype = (COSName) cos_stream.getDictionaryObject(COSName.SUBTYPE);
            if (subtype.equals(COSName.IMAGE)) {
                logger.debug("XObject Image");

                Matrix ctm = context.getGraphicsState().getCurrentTransformationMatrix();
                logger.debug("ctm = " + ctm);

                Pos[] coordinates = new Pos[] { new Pos(0, 0, 1), new Pos(1, 0, 1), new Pos(0, 1, 1),
                        new Pos(1, 1, 1) };

                Pos[] transformed_coordinates = transtormCoordinates(coordinates, ctm);

                /**********************************************************
                 * pdf-as fix: calculating min and max point of an image to look
                 * where the signature should be placed fix solves problems with
                 * footer and images and placement of the signature in an image
                 * only pdf document
                 **********************************************************/

                float actual_lowest_point = Float.NaN;
                float actual_starting_point = Float.NaN;

                int pageRotation = this.mypage.getCurrentPage().getRotation();
                logger.debug("PageRotation = " + pageRotation);
                if (pageRotation == 0) {
                    float min_y = findMinY(transformed_coordinates);
                    logger.debug("min_y = " + min_y);
                    float page_height = this.mypage.getCurrentPage().getMediaBox().getHeight();
                    logger.debug("page_height = " + page_height);

                    actual_lowest_point = page_height - min_y;
                    actual_starting_point = page_height - findMaxY(transformed_coordinates);
                }
                if (pageRotation == 90) {
                    float max_x = findMaxX(transformed_coordinates);
                    logger.debug("max_x = " + max_x);
                    float page_width = this.mypage.getCurrentPage().getMediaBox().getWidth();
                    logger.debug("page_width = " + page_width);

                    actual_lowest_point = max_x;
                    actual_starting_point = findMinX(transformed_coordinates);
                }
                if (pageRotation == 180) {
                    float min_y = findMinY(transformed_coordinates);
                    logger.debug("min_y = " + min_y);
                    actual_lowest_point = findMaxY(transformed_coordinates);
                    actual_starting_point = actual_lowest_point + min_y;
                }
                if (pageRotation == 270) {
                    float min_x = findMinX(transformed_coordinates);
                    logger.debug("min_x = " + min_x);

                    float page_width = this.mypage.getCurrentPage().getMediaBox().getWidth();
                    logger.debug("page_width = " + page_width);

                    actual_lowest_point = page_width - min_x;
                    actual_starting_point = page_width - findMaxX(transformed_coordinates);
                }

                logger.debug("actual_lowest_point = " + actual_lowest_point);

                if (actual_lowest_point > PDFPage.this.effectivePageHeight
                        && actual_starting_point > PDFPage.this.effectivePageHeight) {
                    logger.debug("image is below footer_line");
                    return;
                }

                if (actual_lowest_point > PDFPage.this.max_image_ypos) {
                    PDFPage.this.max_image_ypos = actual_lowest_point;
                }

                return;
            }

            if (xobject instanceof PDFormXObject) {
                PDFormXObject form = (PDFormXObject) xobject;
                COSStream invoke = (COSStream) form.getCOSObject();
                PDResources pdResources = form.getResources();
                PDPage page = context.getCurrentPage();
                if (pdResources == null) {
                    pdResources = page.getResources();
                }

                //getContext().processSubStream(page, pdResources, invoke);//TODO: pdfbox2 - correct?
                getContext().processPage(page);

            }
        }

        @Override
        public String getName() {
            // TODO Auto-generated method stub
            return null;
        }
    }

    public static Pos[] transtormCoordinates(Pos[] coordinates, Matrix m) {
        Pos[] transformed = new Pos[coordinates.length];
        for (int i = 0; i < coordinates.length; i++) {
            transformed[i] = transtormCoordinate(coordinates[i], m);
        }
        return transformed;
    }

    public static Pos transtormCoordinate(Pos pos, Matrix m) {
        Pos transformed = new Pos();
        transformed.x = pos.x * m.getValue(0, 0) + pos.y * m.getValue(1, 0) + pos.z * m.getValue(2, 0);
        transformed.y = pos.x * m.getValue(0, 1) + pos.y * m.getValue(1, 1) + pos.z * m.getValue(2, 1);
        transformed.z = pos.x * m.getValue(0, 2) + pos.y * m.getValue(1, 2) + pos.z * m.getValue(2, 2);

        logger.debug(" transformed " + pos + " --> " + transformed);
        return transformed;
    }

    public static float findMinY(Pos[] coordinates) {
        float min = Float.POSITIVE_INFINITY;
        for (int i = 0; i < coordinates.length; i++) {
            if (coordinates[i].y < min) {
                min = coordinates[i].y;
            }
        }
        return min;
    }

    public static float findMaxY(Pos[] coordinates) {
        float max = 0;
        for (int i = 0; i < coordinates.length; i++) {
            if (coordinates[i].y > max) {
                max = coordinates[i].y;
            }
        }
        return max;
    }

    public static float findMaxX(Pos[] coordinates) {
        float max = Float.NEGATIVE_INFINITY;
        for (int i = 0; i < coordinates.length; i++) {
            if (coordinates[i].x > max) {
                max = coordinates[i].x;
            }
        }
        return max;
    }

    public static float findMinX(Pos[] coordinates) {
        float min = Float.POSITIVE_INFINITY;
        for (int i = 0; i < coordinates.length; i++) {
            if (coordinates[i].x < min) {
                min = coordinates[i].x;
            }
        }
        return min;
    }

    public void processAnnotation(PDAnnotation anno) {
        float current_y = anno.getRectangle().getLowerLeftY();
        float upper_y = 0;
        PDPage page = anno.getPage();

        if (page == null) {
            page = getCurrentPage();
        }

        if (page == null) {
            logger.warn("Annotation without page! The position might not be correct!");
            return;
        }

        int pageRotation = page.getRotation();
        // logger_.debug("PageRotation = " + pageRotation);
        if (pageRotation == 0) {
            float page_height = page.getMediaBox().getHeight();
            current_y = page_height - anno.getRectangle().getLowerLeftY();
            upper_y = page_height - anno.getRectangle().getUpperRightY();
        }
        if (pageRotation == 90) {
            current_y = anno.getRectangle().getUpperRightX();
            upper_y = anno.getRectangle().getLowerLeftX();
        }
        if (pageRotation == 180) {
            current_y = anno.getRectangle().getUpperRightY();
            upper_y = anno.getRectangle().getLowerLeftY();
        }
        if (pageRotation == 270) {
            float page_width = page.getMediaBox().getWidth();
            current_y = page_width - anno.getRectangle().getLowerLeftX();
            upper_y = page_width - anno.getRectangle().getUpperRightX();
        }

        if (current_y > this.effectivePageHeight) {
            if (!this.legacy40 && upper_y < this.effectivePageHeight) {
                // Bottom of annotation is below footer line, 
                // but top of annotation is above footer line!
                // so no place left on this page!
                this.max_character_ypos = this.effectivePageHeight;
            }
            return;
        }

        // store ypos of the char if it is not empty
        if (current_y > this.max_character_ypos) {
            this.max_character_ypos = current_y;
        }
    }

}