Retrieving All the Text from a JTextComponent Efficiently - Java Swing

Java examples for Swing:JTextComponent

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Description

Retrieving All the Text from a JTextComponent Efficiently

Demo Code

import java.text.CharacterIterator;

import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.Segment;

public class Main {
  public static void main(String[] argv) {
    // Create the text component
    JTextComponent textComp = new JTextPane();
    Document doc = textComp.getDocument();

    // Create a segment to hold the characters in the document
    Segment segment = new Segment();
    int pos = 0;/*w ww .  j  a  v  a2 s.  c  o m*/
    segment.setPartialReturn(true);

    try {
      // Retrieve all segments
      while (pos < doc.getLength()) {
        // Ask for the remainder of the document text
        doc.getText(pos, doc.getLength() - pos, segment);

        for (int i = 0; i < segment.count; i++) {
          int positionInDoc = pos + i;
          char charAtPos = segment.array[i + segment.offset];
        }

        // Or use the segment as a character iterator
        int i = 0;
        for (char c = segment.first(); c != CharacterIterator.DONE; c = segment
            .next(), i++) {
          int positionInDoc = pos + i;
          char charAtPos = c;
        }

        // Increment pos by the actual number of characters retrieved
        pos += segment.count;
      }
    } catch (BadLocationException e) {
    }
  }
}

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