001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.markup.html.form;
018
019import org.apache.wicket.markup.ComponentTag;
020import org.apache.wicket.markup.MarkupStream;
021
022/**
023 * A form component label that replaces its body with the contents of
024 * {@link LabeledWebMarkupContainer#getLabel() labelProvider's label}
025 * 
026 * @author Igor Vaynberg (ivaynberg)
027 */
028public class SimpleFormComponentLabel extends FormComponentLabel
029{
030        private static final long serialVersionUID = 1L;
031
032        /**
033         * Construct.
034         * 
035         * @param id
036         *            component id
037         * @param labelProvider
038         *            label provider (e.g. FormComponent, Radio, Check)
039         */
040        public SimpleFormComponentLabel(String id, LabeledWebMarkupContainer labelProvider)
041        {
042                super(id, labelProvider);
043                if (labelProvider.getLabel() == null)
044                {
045                        throw new IllegalStateException("Provided form component does not have a label set. "
046                                + "Use FormComponent.setLabel(IModel) to set the model "
047                                + "that will feed this label");
048                }
049                setDefaultModel(labelProvider.getLabel());
050        }
051
052        /**
053         * @see org.apache.wicket.Component#onComponentTagBody(org.apache.wicket.markup.MarkupStream,
054         *      org.apache.wicket.markup.ComponentTag)
055         */
056        @Override
057        public void onComponentTagBody(final MarkupStream markupStream, final ComponentTag openTag)
058        {
059                replaceComponentTagBody(markupStream, openTag, getDefaultModelObjectAsString());
060        }
061
062}