001 /*
002 * Databinder: a simple bridge from Wicket to Hibernate
003 * Copyright (C) 2006 Nathan Hamblen nathan@technically.us
004
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either
008 * version 2.1 of the License, or (at your option) any later version.
009 *
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
013 * Lesser General Public License for more details.
014 *
015 * You should have received a copy of the GNU Lesser General Public
016 * License along with this library; if not, write to the Free Software
017 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
018 */
019 package net.databinder.components;
020
021 import java.util.Arrays;
022 import java.util.Collection;
023 import java.util.HashSet;
024
025 import org.apache.wicket.markup.html.form.TextArea;
026 import org.apache.wicket.markup.html.form.TextField;
027 import org.apache.wicket.markup.html.panel.Panel;
028 import org.apache.wicket.model.IModel;
029 import org.apache.wicket.util.string.Strings;
030
031 /**
032 * Panel for a comma-separated list of tag strings displayed in a text field or text area. The
033 * backing model for this component must be a Set of String tags. Tags are converted to
034 * lower case before insertion to the set.
035 */
036 public class TagField extends Panel {
037
038 /** Generates text field */
039 public TagField(String id) {
040 this(id, null);
041 }
042 /** Generates text field */
043 public TagField(String id, IModel model) {
044 this(id, model, false);
045 }
046 /** @param textarea true to generate a text area */
047 public TagField(String id, boolean textarea) {
048 this(id, null, textarea);
049 }
050 /** @param textarea true to generate a text area */
051 public TagField(String id, IModel model, boolean textarea) {
052 super(id, model);
053 IModel tagModel = new IModel() {
054 public void detach() {}
055 @SuppressWarnings("unchecked")
056 public Object getObject() {
057 Collection<String> tags = (Collection<String>) TagField.this.getModelObject();
058 if (tags == null) return null;
059 return Strings.join(", ", tags.toArray(new String[tags.size()]));
060 }
061 public void setObject(Object object) {
062 if (object == null)
063 TagField.this.setModelObject(new HashSet<String>());
064 else {
065 String value = ((String) object).toLowerCase();
066 String[] tagstrs = value.split(" *, *,* *"); // also consumes empty ' , ,' tags
067 TagField.this.setModelObject(new HashSet<String>(Arrays.asList(tagstrs)));
068 }
069 }
070 };
071 add(new TextField("field", tagModel).setVisible(!textarea));
072 add(new TextArea("area", tagModel).setVisible(textarea));
073 }
074 }