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     */
016    package com.github.gwtbootstrap.client.ui.base;
017    
018    import com.google.gwt.dom.client.Element;
019    import com.google.gwt.text.shared.testing.PassthroughParser;
020    import 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     */
029    public 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    }