001/*
002 *  Copyright 2012 GWT-Bootstrap
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package com.github.gwtbootstrap.client.ui.base;
017
018import com.google.gwt.dom.client.Element;
019import com.google.gwt.text.shared.testing.PassthroughParser;
020import com.google.gwt.text.shared.testing.PassthroughRenderer;
021
022/**
023 * Abstract base class for most text entry widgets. and Support boostrap style.
024 * 
025 * @since 2.0.4.0
026 * @author ohashi keisuke
027 * @see com.google.gwt.user.client.ui.TextBoxBase
028 */
029public class TextBoxBase extends ValueBoxBase<String> {
030
031        /**
032         * Creates a text box that wraps the given browser element handle. This is
033         * only used by subclasses.
034         * 
035         * @param elem
036         *            the browser element to wrap
037         */
038        protected TextBoxBase(Element elem) {
039                super(elem, PassthroughRenderer.instance(), PassthroughParser.instance());
040        }
041
042        /**
043         * Overridden to return "" from an empty text box.
044         */
045        @Override
046        public String getValue() {
047                String raw = super.getValue();
048                return raw == null
049                                                        ? ""
050                                                        : raw;
051        }
052
053}