iText kernel.jar Source Code

kernel.jar is a component in iText Java library to provide low-level functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided together with the JAR file in the binary packge like iText7-Core-7.1.4.zip. You can download it at iText 7 Core Download site.

You can compile it to generate your JAR file, using kernel.pom as the build configuration file.

The source code of kernel-7.1.4.jar is provided below:

✍: FYIcenter.com

com/itextpdf/kernel/pdf/canvas/parser/listener/SimpleTextExtractionStrategy.java

/*

    This file is part of the iText (R) project.
    Copyright (c) 1998-2018 iText Group NV
    Authors: Bruno Lowagie, Paulo Soares, et al.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License version 3
    as published by the Free Software Foundation with the addition of the
    following permission added to Section 15 as permitted in Section 7(a):
    FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
    ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
    OF THIRD PARTY RIGHTS

    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 or write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA, 02110-1301 USA, or download the license from the following URL:
    http://itextpdf.com/terms-of-use/

    The interactive user interfaces in modified source and object code versions
    of this program must display Appropriate Legal Notices, as required under
    Section 5 of the GNU Affero General Public License.

    In accordance with Section 7(b) of the GNU Affero General Public License,
    a covered work must retain the producer line in every PDF that is created
    or manipulated using iText.

    You can be released from the requirements of the license by purchasing
    a commercial license. Buying such a license is mandatory as soon as you
    develop commercial activities involving the iText software without
    disclosing the source code of your own applications.
    These activities include: offering paid services to customers as an ASP,
    serving PDFs on the fly in a web application, shipping iText with a closed
    source product.

    For more information, please contact iText Software Corp. at this
    address: sales@itextpdf.com
 */
package com.itextpdf.kernel.pdf.canvas.parser.listener;

import com.itextpdf.kernel.geom.LineSegment;
import com.itextpdf.kernel.geom.Vector;
import com.itextpdf.kernel.pdf.canvas.parser.data.IEventData;
import com.itextpdf.kernel.pdf.canvas.parser.EventType;
import com.itextpdf.kernel.pdf.canvas.parser.data.TextRenderInfo;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

public class SimpleTextExtractionStrategy implements ITextExtractionStrategy {

    private Vector lastStart;
    private Vector lastEnd;

    /** used to store the resulting String. */
    private final StringBuilder result = new StringBuilder();

    @Override
    public void eventOccurred(IEventData data, EventType type) {
        if (type.equals(EventType.RENDER_TEXT)) {
            TextRenderInfo renderInfo = (TextRenderInfo)data;
            boolean firstRender = result.length() == 0;
            boolean hardReturn = false;

            LineSegment segment = renderInfo.getBaseline();
            Vector start = segment.getStartPoint();
            Vector end = segment.getEndPoint();

            if (!firstRender){
                Vector x1 = lastStart;
                Vector x2 = lastEnd;

                // see http://mathworld.wolfram.com/Point-LineDistance2-Dimensional.html
                float dist = (x2.subtract(x1)).cross((x1.subtract(start))).lengthSquared() / x2.subtract(x1).lengthSquared();

                float sameLineThreshold = 1f; // we should probably base this on the current font metrics, but 1 pt seems to be sufficient for the time being
                if (dist > sameLineThreshold)
                    hardReturn = true;

                // Note:  Technically, we should check both the start and end positions, in case the angle of the text changed without any displacement
                // but this sort of thing probably doesn't happen much in reality, so we'll leave it alone for now
            }

            if (hardReturn){
                //System.out.println("<< Hard Return >>");
                appendTextChunk("\n");
            } else if (!firstRender){
                if (result.charAt(result.length()-1) != ' ' && renderInfo.getText().length() > 0 && renderInfo.getText().charAt(0) != ' '){ // we only insert a blank space if the trailing character of the previous string wasn't a space, and the leading character of the current string isn't a space
                    float spacing = lastEnd.subtract(start).length();
                    if (spacing > renderInfo.getSingleSpaceWidth()/2f){
                        appendTextChunk(" ");
                        //System.out.println("Inserting implied space before '" + renderInfo.getText() + "'");
                    }
                }
            } else {
                //System.out.println("Displaying first string of content '" + text + "' :: x1 = " + x1);
            }

            //System.out.println("[" + renderInfo.getStartPoint() + "]->[" + renderInfo.getEndPoint() + "] " + renderInfo.getText());
            appendTextChunk(renderInfo.getText());

            lastStart = start;
            lastEnd = end;
        }
    }

    @Override
    public Set<EventType> getSupportedEvents() {
        return Collections.unmodifiableSet(new LinkedHashSet<>(Collections.singletonList(EventType.RENDER_TEXT)));
    }

    /**
     * Returns the result so far.
     * @return	a String with the resulting text.
     */
    @Override
    public String getResultantText() {
        return result.toString();
    }

    /**
     * Used to actually append text to the text results.  Subclasses can use this to insert
     * text that wouldn't normally be included in text parsing (e.g. result of OCR performed against
     * image content)
     * @param text the text to append to the text results accumulated so far
     */
    protected final void appendTextChunk(CharSequence text){
        result.append(text);
    }

}

com/itextpdf/kernel/pdf/canvas/parser/listener/SimpleTextExtractionStrategy.java

 

Or download all of them as a single archive file:

File name: kernel-7.1.4-sources.jar
File size: 1201221 bytes
Release date: 2018-10-09
Download 

 

iText io.jar Source Code

Download and Install iText7-Core-7.1.4.zip

Download and Install iText Java Library

⇑⇑ iText for PDF Generation

2010-02-18, 83708👍, 0💬