| 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.cdm;
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| 28 |
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| 29 | /**************************************************************************************
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| 30 | * Written: 08/05/02
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| 31 | * Revised: 17/11/02 - Commented
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| 32 | * 07/07/03 - DOM support
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| 33 | **************************************************************************************/
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| 34 | import java.awt.*;
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| 35 | import java.awt.event.*;
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| 36 | import java.io.*;
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| 37 | import java.util.*;
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| 38 | import javax.swing.*;
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| 39 | import javax.swing.event.*;
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| 40 | import org.greenstone.gatherer.Configuration;
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| 41 | import org.greenstone.gatherer.DebugStream;
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| 42 | import org.greenstone.gatherer.Dictionary;
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| 43 | import org.greenstone.gatherer.Gatherer;
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| 44 | import org.greenstone.gatherer.gui.GLIButton;
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| 45 | import org.greenstone.gatherer.util.Utility;
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| 46 | import org.w3c.dom.*;
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| 47 |
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| 48 | /** This class manages the language commands, remembering both a list of languages to build indexes in, plus the default language.
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| 49 | * @author John Thompson, Greenstone Digital Library, University of Waikato
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| 50 | * @version 2.3
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| 51 | */
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| 52 | public class LanguageManager
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| 53 | extends DOMProxyListModel {
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| 54 |
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| 55 | static public Document LANGUAGES_DOCUMENT = Utility.parse("xml/languages.xml", true);
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| 56 |
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| 57 | static final private Dimension COMPONENT_SIZE = new Dimension(125,25);
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| 58 |
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| 59 | /** The visual controls for this manager. */
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| 60 | private Control controls = null;
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| 61 | /** A reference to this class as a model, for the inner controls class. */
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| 62 | private DOMProxyListModel model = null;
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| 63 | /** A hashtable of code->name mappings of known languages. */
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| 64 | private LinkedHashMap known_languages = null;
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| 65 | /** The default language object. */
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| 66 | private Language default_language = null;
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| 67 |
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| 68 | /** Constructor. */
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| 69 | public LanguageManager(Element languages_element) {
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| 70 | super(languages_element, CollectionConfiguration.LANGUAGE_ELEMENT, new Language());
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| 71 |
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| 72 | DebugStream.println("LanguageManager: " + getSize() + " languages parsed.");
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| 73 |
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| 74 | this.model = this;
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| 75 | // Retrieve the default language
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| 76 | NodeList default_language_elements = CollectionDesignManager.collect_config.getDocumentElement().getElementsByTagName(CollectionConfiguration.LANGUAGE_DEFAULT_ELEMENT);
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| 77 | if(default_language_elements.getLength() > 0) {
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| 78 | default_language = new Language((Element)default_language_elements.item(0));
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| 79 | }
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| 80 | // Load a series of code->language mappings into known_languages, by reading from the 'languages.xml' file, which is essentially a subset of the ISO 639 Standard.
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| 81 | known_languages = new LinkedHashMap();
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| 82 | /*
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| 83 | try {
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| 84 | File in_file = new File("languages.dat");
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| 85 | FileReader in_reader = new FileReader(in_file);
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| 86 | BufferedReader in = new BufferedReader(in_reader);
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| 87 | String entry = null;
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| 88 | while((entry = in.readLine()) != null) {
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| 89 | if(!entry.startsWith("#")) {
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| 90 | StringTokenizer tokenizer = new StringTokenizer(entry);
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| 91 | if(tokenizer.countTokens() >= 2) {
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| 92 | String name = tokenizer.nextToken();
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| 93 | String code = tokenizer.nextToken().toLowerCase();
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| 94 | known_languages.put(code, name);
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| 95 | }
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| 96 | }
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| 97 | }
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| 98 | in.close();
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| 99 | in_reader.close();
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| 100 | in = null;
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| 101 | in_reader = null;
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| 102 | in_file = null;
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| 103 | }
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| 104 | catch (Exception error) {
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| 105 | error.printStackTrace();
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| 106 | }
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| 107 | */
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| 108 | NodeList language_elements = LANGUAGES_DOCUMENT.getDocumentElement().getElementsByTagName(CollectionConfiguration.LANGUAGE_ELEMENT);
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| 109 | for(int i = 0; i < language_elements.getLength(); i++) {
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| 110 | Element language_element = (Element) language_elements.item(i);
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| 111 | String code = language_element.getAttribute(CollectionConfiguration.CODE_ATTRIBUTE);
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| 112 | String name = language_element.getAttribute(CollectionConfiguration.NAME_ATTRIBUTE);
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| 113 | known_languages.put(code.toLowerCase(), name);
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| 114 | name = null;
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| 115 | code = null;
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| 116 | language_element = null;
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| 117 | }
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| 118 | }
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| 119 |
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| 120 | /** Method to add a new language.
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| 121 | * @param language The <strong>Language</strong> to add.
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| 122 | * @see org.greenstone.gatherer.Gatherer
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| 123 | * @see org.greenstone.gatherer.collection.CollectionManager
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| 124 | */
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| 125 | private void addLanguage(Language language) {
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| 126 | if(!contains(language)) {
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| 127 | Element element = language.getElement();
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| 128 | append(language);
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| 129 | Gatherer.c_man.configurationChanged();
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| 130 | }
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| 131 | }
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| 132 |
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| 133 | public void destroy() {
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| 134 | if(controls != null) {
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| 135 | controls.destroy();
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| 136 | controls = null;
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| 137 | }
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| 138 | known_languages.clear();
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| 139 | known_languages = null;
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| 140 | }
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| 141 |
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| 142 | /** Method to retrieve the control for this manager.
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| 143 | * @return the Control for editing the language partitions
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| 144 | */
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| 145 | public Control getControls() {
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| 146 | if(controls == null) {
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| 147 | // Build controls
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| 148 | controls = new LanguageControl();
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| 149 | }
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| 150 | return controls;
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| 151 | }
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| 152 |
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| 153 | /** Method to retrieve the default language code.
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| 154 | * @return A <strong>Language</strong> containing a two letter code.
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| 155 | */
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| 156 | /* private Language getDefaultLanguage() {
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| 157 | // If no default is set...
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| 158 | if(default_language != null && default_language.isAssigned()) {
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| 159 | return default_language;
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| 160 | }
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| 161 | return null;
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| 162 | } */
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| 163 |
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| 164 | /** Method to retrieve a certain language object by its code.
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| 165 | * @param code The two letter code of a language, as a <strong>String</strong>.
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| 166 | * @return The <strong>Language</strong> that matches the given code, or <i>null</i> if no such language exists.
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| 167 | */
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| 168 | public Language getLanguage(String code) {
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| 169 | int size = getSize();
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| 170 | for(int i = 0; i < size; i++) {
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| 171 | Language language = (Language) getElementAt(i);
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| 172 | if(language.getCode().equals(code)) {
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| 173 | return language;
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| 174 | }
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| 175 | }
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| 176 | return null;
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| 177 | }
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| 178 |
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| 179 | public ArrayList getLanguages() {
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| 180 | return children();
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| 181 | }
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| 182 |
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| 183 | /** Method to return a list of the known language codes.
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| 184 | * @return an ArrayList containing the series of known language codes as per the languages.dat file
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| 185 | */
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| 186 | public ArrayList getLanguageCodes() {
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| 187 | return new ArrayList(known_languages.keySet());
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| 188 | }
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| 189 |
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| 190 | public String getLanguageName(String code) {
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| 191 | return (String) known_languages.get(code);
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| 192 | }
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| 193 |
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| 194 | /** Method to remove a certain language.
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| 195 | * @param language The <strong>Language</strong> to remove.
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| 196 | * @see org.greenstone.gatherer.Gatherer
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| 197 | * @see org.greenstone.gatherer.collection.CollectionManager
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| 198 | */
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| 199 | private void removeLanguage(Language language) {
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| 200 | remove(language);
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| 201 | if(default_language != null && default_language.equals(language)) {
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| 202 | default_language = null;
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| 203 | ((LanguageControl)controls).clearDefaultLanguage();
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| 204 | }
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| 205 | Gatherer.c_man.configurationChanged();
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| 206 | }
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| 207 |
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| 208 | /** Method to set the default language.
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| 209 | * @param language The <strong>Language</strong> to use as a default, or <i>null</i> for no default.
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| 210 | * @see org.greenstone.gatherer.Gatherer
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| 211 | * @see org.greenstone.gatherer.collection.CollectionManager
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| 212 | */
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| 213 | public void setDefault(Language language) {
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| 214 | if(language != null) {
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| 215 | if(default_language == null) {
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| 216 | // Create the default index element, and place immediately after indexes element.
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| 217 | Element default_language_element = root.getOwnerDocument().createElement(CollectionConfiguration.LANGUAGE_DEFAULT_ELEMENT);
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| 218 | default_language = new Language(default_language_element);
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| 219 | Node target_node = CollectionConfiguration.findInsertionPoint(default_language_element);
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| 220 | if(target_node != null) {
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| 221 | root.getOwnerDocument().getDocumentElement().insertBefore(default_language_element, target_node);
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| 222 | }
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| 223 | else {
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| 224 | root.getOwnerDocument().getDocumentElement().appendChild(default_language_element);
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| 225 | }
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| 226 | }
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| 227 | default_language.setAssigned(true);
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| 228 | default_language.setCode(language.getCode());
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| 229 | }
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| 230 | else {
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| 231 | if(default_language != null) {
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| 232 | default_language.setAssigned(false);
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| 233 | }
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| 234 | }
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| 235 | Gatherer.c_man.configurationChanged();
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| 236 | }
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| 237 |
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| 238 |
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| 239 | /** This class represents the visual component of the Language Manager. */
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| 240 | private class LanguageControl
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| 241 | extends JPanel
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| 242 | implements Control {
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| 243 | /** The button to add a new language support. */
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| 244 | private JButton add_button = null;
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| 245 | /** The button to clear the current default language. */
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| 246 | private JButton clear_button = null;
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| 247 | /** The button to remove a supported language. */
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| 248 | private JButton remove_button = null;
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| 249 | /** The button to set the current language as the default one. */
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| 250 | private JButton set_button = null;
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| 251 | /** A combobox listing the available supported languages. */
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| 252 | private JComboBox selector_combobox = null;
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| 253 | /** A list of currently supported languages. */
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| 254 | private JList language_list = null;
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| 255 | /** A description of the language currently selected. */
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| 256 | private JTextArea description_textarea = null;
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| 257 | /** The text field showing the currently name of the default language. Non-editable. */
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| 258 | private JTextField default_language_field = null;
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| 259 | /** Constructor.
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| 260 | * @see org.greenstone.gatherer.cdm.LanguageManager.LanguageControl.AddListener
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| 261 | * @see org.greenstone.gatherer.cdm.LanguageManager.LanguageControl.ClearDefaultListener
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| 262 | * @see org.greenstone.gatherer.cdm.LanguageManager.LanguageControl.ListListener
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| 263 | * @see org.greenstone.gatherer.cdm.LanguageManager.LanguageControl.RemoveListener
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| 264 | * @see org.greenstone.gatherer.cdm.LanguageManager.LanguageControl.SelectorListener
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| 265 | * @see org.greenstone.gatherer.cdm.LanguageManager.LanguageControl.SetDefaultListener
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| 266 | */
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| 267 | public LanguageControl() {
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| 268 | super();
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| 269 | // Creation.
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| 270 | JPanel center_panel = new JPanel();
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| 271 |
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| 272 | JLabel language_list_label = new JLabel();
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| 273 | Dictionary.registerText(language_list_label, "CDM.LanguageManager.Assigned_Languages");
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| 274 | language_list = new JList(model);
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| 275 |
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| 276 | JPanel details_panel = new JPanel();
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| 277 |
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| 278 | JPanel default_panel = new JPanel();
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| 279 |
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| 280 | JLabel default_label = new JLabel();
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| 281 | default_label.setBorder(BorderFactory.createEmptyBorder(0,0,0,5));
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| 282 | Dictionary.registerText(default_label, "CDM.LanguageManager.Default_Language");
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| 283 |
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| 284 | if(default_language == null) {
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| 285 | default_language_field = new JTextField();
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| 286 | }
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| 287 | else {
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| 288 | default_language_field = new JTextField(default_language.toString());
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| 289 | }
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| 290 | default_language_field.setPreferredSize(COMPONENT_SIZE);
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| 291 | default_language_field.setBackground(Configuration.getColor("coloring.collection_tree_background", false));
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| 292 | default_language_field.setEditable(false);
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| 293 | JPanel control_panel = new JPanel();
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| 294 |
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| 295 | JLabel selector_label = new JLabel();
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| 296 | Dictionary.registerText(selector_label, "CDM.LanguageManager.Selector");
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| 297 |
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| 298 | selector_combobox = new JComboBox(getLanguageCodes().toArray());
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| 299 | selector_combobox.setPreferredSize(COMPONENT_SIZE);
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| 300 | selector_combobox.setBackground(Configuration.getColor("coloring.collection_tree_background", false));
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| 301 | selector_combobox.setRenderer(new LanguageListCellRenderer());
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| 302 | Dictionary.registerTooltip(selector_combobox, "CDM.LanguageManager.Selector_Tooltip");
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| 303 |
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| 304 | JPanel button_panel = new JPanel();
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| 305 |
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| 306 | add_button = new GLIButton();
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| 307 | add_button.setMnemonic(KeyEvent.VK_A);
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| 308 | Dictionary.registerBoth(add_button, "CDM.LanguageManager.Add", "CDM.LanguageManager.Add_Tooltip");
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| 309 |
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| 310 | remove_button = new GLIButton();
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| 311 | remove_button.setMnemonic(KeyEvent.VK_R);
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| 312 | remove_button.setEnabled(false);
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| 313 | Dictionary.registerBoth(remove_button, "CDM.LanguageManager.Remove", "CDM.LanguageManager.Remove_Tooltip");
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| 314 |
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| 315 | clear_button = new GLIButton();
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| 316 | clear_button.setMnemonic(KeyEvent.VK_C);
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| 317 | // If there is a default language, then this is enabled
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| 318 | clear_button.setEnabled(default_language != null && default_language.isAssigned());
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| 319 | Dictionary.registerBoth(clear_button, "CDM.LanguageManager.Clear_Default", "CDM.LanguageManager.Clear_Default_Tooltip");
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| 320 |
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| 321 | set_button = new GLIButton();
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| 322 | set_button.setMnemonic(KeyEvent.VK_S);
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| 323 | set_button.setEnabled(false);
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| 324 | Dictionary.registerBoth(set_button, "CDM.LanguageManager.Set_Default", "CDM.LanguageManager.Set_Default_Tooltip");
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| 325 |
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| 326 | // Set up and connect listeners.
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| 327 | add_button.addActionListener(new AddListener());
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| 328 | clear_button.addActionListener(new ClearDefaultListener());
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| 329 | remove_button.addActionListener(new RemoveListener());
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| 330 | selector_combobox.addActionListener(new SelectorListener());
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| 331 | set_button.addActionListener(new SetDefaultListener());
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| 332 | language_list.addListSelectionListener(new ListListener());
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| 333 |
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| 334 | // Layout components
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| 335 | default_panel.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createRaisedBevelBorder(), BorderFactory.createEmptyBorder(2,0,2,2)));
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| 336 | default_panel.setLayout(new BorderLayout());
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| 337 | default_panel.add(default_label, BorderLayout.WEST);
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| 338 | default_panel.add(default_language_field, BorderLayout.CENTER);
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| 339 |
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| 340 | control_panel.setBorder(BorderFactory.createEmptyBorder(5,0,0,0));
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| 341 | control_panel.setLayout(new BorderLayout());
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| 342 | control_panel.add(selector_label, BorderLayout.WEST);
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| 343 | control_panel.add(selector_combobox, BorderLayout.CENTER);
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| 344 |
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| 345 | details_panel.setBorder(BorderFactory.createEmptyBorder(5,0,5,0));
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| 346 | details_panel.setLayout(new BorderLayout());
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| 347 | details_panel.add(default_panel, BorderLayout.CENTER);
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| 348 | details_panel.add(control_panel, BorderLayout.SOUTH);
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| 349 |
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| 350 | center_panel.setLayout(new BorderLayout());
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| 351 | center_panel.add(language_list_label, BorderLayout.NORTH);
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| 352 | center_panel.add(new JScrollPane(language_list), BorderLayout.CENTER);
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| 353 | center_panel.add(details_panel, BorderLayout.SOUTH);
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| 354 |
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| 355 | button_panel.setLayout(new GridLayout(2,2));
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| 356 | button_panel.add(add_button);
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| 357 | button_panel.add(remove_button);
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| 358 | button_panel.add(set_button);
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| 359 | button_panel.add(clear_button);
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| 360 |
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| 361 | setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
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| 362 | setLayout(new BorderLayout());
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| 363 | add(center_panel, BorderLayout.CENTER);
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| 364 | add(button_panel, BorderLayout.SOUTH);
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| 365 | }
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| 366 |
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| 367 | public void clearDefaultLanguage() {
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| 368 | clear_button.doClick();
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| 369 | }
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| 370 |
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| 371 | /** Destructor. */
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| 372 | public void destroy() {
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| 373 | }
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| 374 |
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| 375 | public void gainFocus() {
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| 376 | }
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| 377 |
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| 378 | public void loseFocus() {
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| 379 | }
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| 380 |
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| 381 | /** Listens for actions apon the 'add' button in the LanguageManager controls, and if detected calls the add method of the manager with a newly created language. */
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| 382 | private class AddListener
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| 383 | implements ActionListener {
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| 384 | /** Add a new language support.
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| 385 | * @param event an ActionEvent
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| 386 | * @see org.greenstone.gatherer.cdm.Language
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| 387 | */
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| 388 | public void actionPerformed(ActionEvent event) {
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| 389 | String language_code = (String) selector_combobox.getSelectedItem();
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| 390 | if(language_code != null) {
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| 391 | addLanguage(new Language(language_code));
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| 392 | }
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| 393 | add_button.setEnabled(false);
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| 394 | }
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| 395 | }
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| 396 |
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| 397 | /** Listens for actions apon the 'clear default' button in the LanguageManager controls, and if detected calls the setDefault method of the manager with <i>null</i>. */
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| 398 | private class ClearDefaultListener
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| 399 | implements ActionListener {
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| 400 | /** Clear the default index.
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| 401 | * @param event An <strong>ActionEvent</strong>.
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| 402 | */
|
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| 403 | public void actionPerformed(ActionEvent event) {
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| 404 | setDefault(null);
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| 405 | clear_button.setEnabled(false);
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| 406 | default_language_field.setText("");
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| 407 | }
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| 408 | }
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| 409 |
|
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| 410 | /** Listens for actions apon the 'remove' button in the LanguageManager controls, and if detected calls the remove method of the manager with the language selected for removal. */
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| 411 | private class RemoveListener
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| 412 | implements ActionListener {
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|---|
| 413 | /** Remove the currently selected language, if any.
|
|---|
| 414 | * @param event An <strong>ActionEvent</strong>.
|
|---|
| 415 | * @see org.greenstone.gatherer.cdm.Language
|
|---|
| 416 | */
|
|---|
| 417 | public void actionPerformed(ActionEvent event) {
|
|---|
| 418 | Language delete_me = (Language)language_list.getSelectedValue();
|
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| 419 | if(delete_me != null) {
|
|---|
| 420 | removeLanguage(delete_me);
|
|---|
| 421 | if(default_language != null && default_language.equals(delete_me)) {
|
|---|
| 422 | setDefault(null);
|
|---|
| 423 | clear_button.setEnabled(false);
|
|---|
| 424 | default_language_field.setText("");
|
|---|
| 425 | }
|
|---|
| 426 | }
|
|---|
| 427 | remove_button.setEnabled(false);
|
|---|
| 428 | }
|
|---|
| 429 | }
|
|---|
| 430 |
|
|---|
| 431 | /** Listens for selections within the combobox on the LanguageManager controls, and if a change is detected enables, or disables, controls appropriately. */
|
|---|
| 432 | private class SelectorListener
|
|---|
| 433 | implements ActionListener {
|
|---|
| 434 | /** Enable or disable controls depeding on selection.
|
|---|
| 435 | * @param event An <strong>ActionEvent</strong>.
|
|---|
| 436 | */
|
|---|
| 437 | public void actionPerformed(ActionEvent event) {
|
|---|
| 438 | if(selector_combobox.getSelectedItem() != null) {
|
|---|
| 439 | add_button.setEnabled(true);
|
|---|
| 440 | }
|
|---|
| 441 | else {
|
|---|
| 442 | add_button.setEnabled(false);
|
|---|
| 443 | }
|
|---|
| 444 | }
|
|---|
| 445 | }
|
|---|
| 446 |
|
|---|
| 447 | /** Listens for actions apon the 'set default' button in the LanguageManager controls, and if detected calls the <i>setDefault()</i> method of the manager with the language selected for default. */
|
|---|
| 448 | private class SetDefaultListener
|
|---|
| 449 | implements ActionListener {
|
|---|
| 450 | /** Set the default index to the one currently selected, if any.
|
|---|
| 451 | * @param event An <strong>ActionEvent</strong>.
|
|---|
| 452 | * @see org.greenstone.gatherer.cdm.Language
|
|---|
| 453 | */
|
|---|
| 454 | public void actionPerformed(ActionEvent event) {
|
|---|
| 455 | if(!language_list.isSelectionEmpty()) {
|
|---|
| 456 | setDefault((Language)language_list.getSelectedValue());
|
|---|
| 457 | clear_button.setEnabled(true);
|
|---|
| 458 | default_language_field.setText(default_language.toString());
|
|---|
| 459 | }
|
|---|
| 460 | }
|
|---|
| 461 | }
|
|---|
| 462 |
|
|---|
| 463 | /** Listens for selections within the list on the LanguageManager controls, and if a change is detected enables, or disables, controls appropriately. */
|
|---|
| 464 | private class ListListener
|
|---|
| 465 | implements ListSelectionListener {
|
|---|
| 466 | /** Enable or disable controls depending on the current list selection.
|
|---|
| 467 | * @param event A <strong>ListSelectionEvent</strong>.
|
|---|
| 468 | */
|
|---|
| 469 | public void valueChanged(ListSelectionEvent event) {
|
|---|
| 470 | if(language_list.isSelectionEmpty()) {
|
|---|
| 471 | remove_button.setEnabled(false);
|
|---|
| 472 | set_button.setEnabled(false);
|
|---|
| 473 | }
|
|---|
| 474 | else {
|
|---|
| 475 | remove_button.setEnabled(true);
|
|---|
| 476 | set_button.setEnabled(true);
|
|---|
| 477 | }
|
|---|
| 478 | }
|
|---|
| 479 | }
|
|---|
| 480 | }
|
|---|
| 481 | }
|
|---|
