diff options
Diffstat (limited to 'pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFPage.java')
| -rw-r--r-- | pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFPage.java | 377 |
1 files changed, 377 insertions, 0 deletions
diff --git a/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFPage.java b/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFPage.java new file mode 100644 index 0000000..a0311da --- /dev/null +++ b/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFPage.java @@ -0,0 +1,377 @@ +/**
+ * <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.pdf;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.log4j.Logger;
+import org.pdfbox.cos.COSName;
+import org.pdfbox.cos.COSStream;
+import org.pdfbox.pdmodel.PDPage;
+import org.pdfbox.pdmodel.PDResources;
+import org.pdfbox.pdmodel.common.PDStream;
+import org.pdfbox.pdmodel.graphics.xobject.PDXObject;
+import org.pdfbox.pdmodel.graphics.xobject.PDXObjectForm;
+import org.pdfbox.util.Matrix;
+import org.pdfbox.util.PDFOperator;
+import org.pdfbox.util.PDFTextStripper;
+import org.pdfbox.util.TextPosition;
+import org.pdfbox.util.operator.OperatorProcessor;
+
+import at.knowcenter.wag.egov.egiz.cfg.ConfigLogger;
+
+/**
+ * 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 PDFPage#showCharacter(TextPosition)}<br>
+ * This method is called when processing the FileStream. By calling the method
+ * {@link org.pdfbox.util.PDFStreamEngine#processStream(org.pdfbox.pdmodel.PDPage, org.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_ = ConfigLogger.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 y coordinate of the footer line. PDF elements below this footer line will not be regarded.
+ */
+ protected float footer_line = 0.0f;
+
+ /**
+ * Constructor.
+ *
+ * @param footer_line The y coordinate of the footer line. PDF elements below this footer line will not be regarded.
+ *
+ * @throws IOException
+ */
+ public PDFPage(float footer_line) throws IOException
+ {
+ super();
+
+ this.footer_line = footer_line;
+
+ OperatorProcessor newInvoke = new MyInvoke();
+ newInvoke.setContext(this);
+ operators.put("Do", newInvoke);
+ }
+
+
+ protected void processOperator(PDFOperator operator, List arguments) throws IOException
+ {
+ //logger_.debug("operator = " + operator);
+
+ super.processOperator(operator, arguments);
+ }
+
+ // 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.getCharacter();
+
+ int pageRotation = page.findRotation();
+ //logger_.debug("PageRotation = " + pageRotation);
+ if (pageRotation == 0)
+ {
+ current_y = text.getY();
+ }
+ if (pageRotation == 90)
+ {
+ current_y = text.getX();
+ }
+ if (pageRotation == 180)
+ {
+ float page_height = page.findMediaBox().getHeight();
+ current_y = page_height - text.getY();
+ }
+ if (pageRotation == 270)
+ {
+ float page_height = page.findMediaBox().getHeight();
+ current_y = page_height - text.getX();
+ }
+
+
+ if (current_y > this.footer_line)
+ {
+ //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 (!character.equals(" ") && current_y > this.max_character_ypos)
+ {
+ this.max_character_ypos = current_y;
+ //logger_.debug("text.character=" + character + ", y=" + current_y);
+ // System.err.println(character + "|" + current_y);
+ }
+
+ //logger_.error("text.character=" + character + ", y=" + current_y + " max_c=" + this.max_character_ypos);
+ // System.err.println(character + "|" + 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()
+ {
+ float max_ypos = Float.NEGATIVE_INFINITY;
+
+ if (this.max_character_ypos > this.max_image_ypos)
+ {
+ max_ypos = this.max_character_ypos;
+ }
+ else
+ {
+ max_ypos = this.max_image_ypos;
+ }
+ //logger_.error("max len=" + max_ypos);
+ return max_ypos;
+ }
+
+ public class MyInvoke extends OperatorProcessor
+ {
+
+ public void process(PDFOperator operator, List arguments) throws IOException
+ {
+ COSName name = (COSName) arguments.get(0);
+ //logger_.error("<Do name=\"" + name.getName() + "\">");
+
+ // PDResources res = context.getResources();
+
+ Map xobjects = context.getXObjects();
+ PDXObject xobject = (PDXObject) xobjects.get(name.getName());
+
+ PDStream stream = xobject.getPDStream();
+ COSStream cos_stream = stream.getStream();
+
+ COSName subtype = (COSName) cos_stream.getDictionaryObject(COSName.SUBTYPE);
+ //logger_.error("<Do subtype name=\"" + subtype.getName() + "\">");
+ if (subtype.equals(COSName.IMAGE))
+ {
+ //logger_.error("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 = page.findRotation();
+ logger_.debug("PageRotation = " + pageRotation);
+ if (pageRotation == 0)
+ {
+ float min_y = findMinY(transformed_coordinates);
+ logger_.debug("min_y = " + min_y);
+ float page_height = page.findMediaBox().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 = page.findMediaBox().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);
+ float page_height = page.findMediaBox().getHeight();
+ actual_lowest_point = page_height - findMaxY(transformed_coordinates);
+ actual_starting_point = page_height - min_y;
+ }
+ if (pageRotation == 270)
+ {
+ float min_x = findMinX(transformed_coordinates);
+ logger_.debug("min_x = " + min_x);
+
+ float page_width = page.findMediaBox().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.footer_line && actual_starting_point > PDFPage.this.footer_line)
+ {
+ logger_.debug("image is below footer_line. footer_line = " + PDFPage.this.footer_line);
+ return;
+ }
+
+ if (actual_lowest_point > PDFPage.this.max_image_ypos)
+ {
+ PDFPage.this.max_image_ypos = actual_lowest_point;
+ }
+
+ return;
+ }
+
+ if (xobject instanceof PDXObjectForm)
+ {
+ PDXObjectForm form = (PDXObjectForm) xobject;
+ COSStream invoke = (COSStream) form.getCOSObject();
+ PDResources pdResources = form.getResources();
+ PDPage page = context.getCurrentPage();
+ if (pdResources == null)
+ {
+ pdResources = page.findResources();
+ }
+
+ getContext().processSubStream(page, pdResources, invoke);
+ }
+ }
+ }
+
+ 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;
+ }
+
+}
\ No newline at end of file |