Java/CoreJava/v2ch06/textFormat/IntFilter.java at master · mthli/Java · GitHub

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package textFormat;

import javax.swing.text.*;

/**

* A filter that restricts input to digits and a '-' sign.

public class IntFilter extends DocumentFilter

{

public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr)

throws BadLocationException

{

StringBuilder builder = new StringBuilder(string);

for (int i = builder.length() - 1; i >= 0; i--)

{

int cp = builder.codePointAt(i);

if (!Character.isDigit(cp) && cp != '-')

{

builder.deleteCharAt(i);

if (Character.isSupplementaryCodePoint(cp))

{

i--;

builder.deleteCharAt(i);

}

super.insertString(fb, offset, builder.toString(), attr);

}

public void replace(FilterBypass fb, int offset, int length, String string, AttributeSet attr)

throws BadLocationException

{

if (string != null)

{

StringBuilder builder = new StringBuilder(string);

for (int i = builder.length() - 1; i >= 0; i--)

{

int cp = builder.codePointAt(i);

if (!Character.isDigit(cp) && cp != '-')

{

builder.deleteCharAt(i);

if (Character.isSupplementaryCodePoint(cp))

{

i--;

builder.deleteCharAt(i);

}

string = builder.toString();

}

super.replace(fb, offset, length, string, attr);

}

Java/CoreJava/v2ch06/textFormat/IntFilter.java at master · mthli/Java · GitHub

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