[9079] | 1 | /**
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| 2 | *#########################################################################
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| 3 | *
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| 4 | * A component of the Gatherer application, part of the Greenstone digital
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| 5 | * library suite from the New Zealand Digital Library Project at the
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| 6 | * University of Waikato, New Zealand.
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| 7 | *
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| 8 | * Author: John Thompson, Greenstone Digital Library, University of Waikato
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| 9 | *
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| 10 | * Copyright (C) 1999 New Zealand Digital Library Project
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or modify
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| 13 | * it under the terms of the GNU General Public License as published by
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| 14 | * the Free Software Foundation; either version 2 of the License, or
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| 15 | * (at your option) any later version.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful,
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| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 20 | * GNU General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, write to the Free Software
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| 24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 25 | *########################################################################
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| 26 | */
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| 27 | package org.greenstone.gatherer.gems;
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| 28 |
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| 29 | import java.util.*;
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| 30 | import javax.swing.*;
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| 31 | import javax.swing.text.*;
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[9170] | 32 |
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| 33 |
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[9079] | 34 | /** A JTextField that doesn't allow certain characters, either blocking or replacing them
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| 35 | * @author John Thompson, Greenstone Digital Library, University of Waikato
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| 36 | * @version 2.4
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| 37 | */
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| 38 | public class TransformCharacterTextField
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| 39 | extends JTextField {
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| 40 |
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| 41 | private boolean block_all_except_mappings = false;
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| 42 | static private HashMap mappings = new HashMap();
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| 43 |
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| 44 | static public TransformCharacterTextField createNamespaceTextField() {
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| 45 | TransformCharacterTextField text = new TransformCharacterTextField();
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| 46 | text.setBlockAllExceptMappings(true);
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| 47 | int i = 'a';
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| 48 | int j = 'A';
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| 49 | for( ; i <= 'z'; i++, j++) {
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| 50 | text.replaceCharacter((char)i, (char)i);
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| 51 | text.replaceCharacter((char)j, (char)i);
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| 52 | }
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| 53 | return text;
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| 54 | }
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| 55 |
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| 56 | public TransformCharacterTextField() {
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| 57 | super();
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| 58 | }
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| 59 |
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| 60 | public TransformCharacterTextField(String text) {
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| 61 | super(text);
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| 62 | }
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| 63 |
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| 64 | public void replaceCharacter(char x, char y) {
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| 65 | mappings.put(new Character(x), new Character(y));
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| 66 | }
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| 67 |
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| 68 | public void setBlockAllExceptMappings(boolean block_all_except_mappings) {
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| 69 | this.block_all_except_mappings = block_all_except_mappings;
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| 70 | setText(""); // Have to reset
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| 71 | }
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| 72 |
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| 73 | protected Document createDefaultModel() {
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| 74 | return new TransformCharacterTextDocument();
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| 75 | }
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| 76 |
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| 77 | private class TransformCharacterTextDocument
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| 78 | extends PlainDocument {
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| 79 |
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| 80 | public void insertString(int offs, String str, AttributeSet a)
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| 81 | throws BadLocationException {
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| 82 |
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| 83 | if (str == null) {
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| 84 | return;
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| 85 | }
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| 86 | char[] raw = str.toCharArray();
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| 87 | StringBuffer result = new StringBuffer("");
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| 88 | for (int i = 0; i < raw.length; i++) {
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| 89 | Character key = new Character(raw[i]);
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| 90 | if(mappings.containsKey(key)) {
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| 91 | Character replacement = (Character) mappings.get(key);
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| 92 | if(replacement != null) {
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| 93 | result.append(replacement.charValue());
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| 94 | replacement = null;
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| 95 | }
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| 96 | }
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| 97 | else if(!block_all_except_mappings) {
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| 98 | result.append(raw[i]);
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| 99 | }
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| 100 | key = null;
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| 101 | }
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| 102 | super.insertString(offs, result.toString(), a);
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| 103 | }
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| 104 | }
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| 105 | }
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