content: /*****************************************************************
   *   Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  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
   *  with the License.  You may obtain a copy of the License at
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   ****************************************************************/
  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);
              }
          }
      }
  }
  