org.apache.cayenne.swing.components.LimitedTextField Maven / Gradle / Ivy

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 *   Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
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 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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 *
 *    https://www.apache.org/licenses/LICENSE-2.0
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package org.apache.cayenne.swing.components;

import javax.swing.JTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;

public class LimitedTextField extends JTextField {

    private static final long serialVersionUID = 5615520143950793884L;

    public LimitedTextField(int limit) {
        setDocument(new LimitedDocument(limit));
    }

    private static class LimitedDocument extends PlainDocument {

        private static final long serialVersionUID = 2371422073526259311L;
        private int limit;

        LimitedDocument(int limit) {
            super();
            this.limit = limit;
        }

        public void insertString( int offset, String  str, AttributeSet attr ) throws BadLocationException {
            if (str == null) return;

            if ((getLength() + str.length()) <= limit) {
                super.insertString(offset, str, attr);
            }
        }
    }
}