source: trunk/gli/src/org/greenstone/gatherer/gems/TransformCharacterTextField.java@ 9647

/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: John Thompson, Greenstone Digital Library, University of Waikato
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */
package org.greenstone.gatherer.gems;

import java.util.*;
import javax.swing.*;
import javax.swing.text.*;


/** A JTextField that doesn't allow certain characters, either blocking or replacing them
 * @author John Thompson, Greenstone Digital Library, University of Waikato
 * @version 2.4
 */
public class TransformCharacterTextField 
    extends JTextField {
    
    private boolean block_all_except_mappings = false;
    static private HashMap mappings = new HashMap();

    static public TransformCharacterTextField createNamespaceTextField() {
    TransformCharacterTextField text = new TransformCharacterTextField();
    text.setBlockAllExceptMappings(true);
    int i = 'a';
    int j = 'A';
    for( ; i <= 'z'; i++, j++) {
        text.replaceCharacter((char)i, (char)i);
        text.replaceCharacter((char)j, (char)i);
    }
    return text;
    }

    public TransformCharacterTextField() {
    super();
    }

    public TransformCharacterTextField(String text) {
    super(text);
    }

    public void replaceCharacter(char x, char y) {
    mappings.put(new Character(x), new Character(y));
    }

    public void setBlockAllExceptMappings(boolean block_all_except_mappings) {
    this.block_all_except_mappings = block_all_except_mappings;
    setText(""); // Have to reset
    }

    protected Document createDefaultModel() {
    return new TransformCharacterTextDocument();
    }

    private class TransformCharacterTextDocument 
    extends PlainDocument {
          
    public void insertString(int offs, String str, AttributeSet a) 
        throws BadLocationException {
                
        if (str == null) {
        return;
        }
        char[] raw = str.toCharArray();
        StringBuffer result = new StringBuffer("");
        for (int i = 0; i < raw.length; i++) {
        Character key = new Character(raw[i]);
        if(mappings.containsKey(key)) {
            Character replacement = (Character) mappings.get(key);
            if(replacement != null) {
            result.append(replacement.charValue());
            replacement = null;
            }
        }
        else if(!block_all_except_mappings) {
            result.append(raw[i]);
        }
        key = null;
        }
        super.insertString(offs, result.toString(), a);
    }
    }
}