001// Copyright 2004, 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry.contrib.form.checkboxes;
016
017import org.apache.hivemind.ApplicationRuntimeException;
018import org.apache.tapestry.BaseComponent;
019import org.apache.tapestry.IRequestCycle;
020
021/**
022 * @author mb
023 * @since 4.0
024*/
025public abstract class ControlCheckbox extends BaseComponent
026{
027    public abstract CheckboxGroup getGroup();
028    
029    public CheckboxGroup getCheckboxGroup()
030    {
031        CheckboxGroup group = getGroup();
032        if (group == null) {
033            IRequestCycle cycle = getPage().getRequestCycle();
034            group = (CheckboxGroup) cycle.getAttribute(CheckboxGroup.CHECKBOX_GROUP_ATTRIBUTE);
035        }
036        if (group == null)
037            throw new ApplicationRuntimeException("The component " + getExtendedId() + " must be wrapped by a CheckboxGroup or the 'group' parameter must be set.");
038
039        return group;
040    }
041
042}