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}