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TextStripper.java
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82 lines (67 loc) · 2.78 KB
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package technology.tabula;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.text.PDFTextStripper;
import org.apache.pdfbox.text.TextPosition;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class TextStripper extends PDFTextStripper {
private static final String NBSP = "\u00A0";
private PDDocument document;
public ArrayList<TextElement> textElements;
public RectangleSpatialIndex<TextElement> spatialIndex;
public float minCharWidth = Float.MAX_VALUE;
public float minCharHeight = Float.MAX_VALUE;
public TextStripper(PDDocument document, int pageNumber) throws IOException {
super();
this.document = document;
this.setStartPage(pageNumber);
this.setEndPage(pageNumber);
this.textElements = new ArrayList<>();
this.spatialIndex = new RectangleSpatialIndex<>();
}
public void process() throws IOException {
this.getText(this.document);
}
@Override
protected void writeString(String string, List<TextPosition> textPositions) throws IOException
{
for (TextPosition textPosition: textPositions)
{
if (textPosition == null) {
continue;
}
String c = textPosition.getUnicode();
// if c not printable, return
if (!isPrintable(c)) {
continue;
}
Float h = textPosition.getHeightDir();
if (c.equals(NBSP)) { // replace non-breaking space for space
c = " ";
}
float wos = textPosition.getWidthOfSpace();
TextElement te = new TextElement(Utils.round(textPosition.getYDirAdj() - h, 2),
Utils.round(textPosition.getXDirAdj(), 2), Utils.round(textPosition.getWidthDirAdj(), 2),
Utils.round(textPosition.getHeightDir(), 2), textPosition.getFont(), textPosition.getFontSize(), c,
// workaround a possible bug in PDFBox:
// https://issues.apache.org/jira/browse/PDFBOX-1755
wos, textPosition.getDir());
this.minCharWidth = (float) Math.min(this.minCharWidth, te.getWidth());
this.minCharHeight = (float) Math.min(this.minCharHeight, te.getHeight());
this.spatialIndex.add(te);
this.textElements.add(te);
}
}
private boolean isPrintable(String s) {
Character c;
Character.UnicodeBlock block;
boolean printable = false;
for (int i = 0; i < s.length(); i++) {
c = s.charAt(i);
block = Character.UnicodeBlock.of(c);
printable |= !Character.isISOControl(c) && block != null && block != Character.UnicodeBlock.SPECIALS;
}
return printable;
}
}