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    
015    package org.apache.tapestry.contrib.form.checkboxes;
016    
017    import org.apache.hivemind.ApplicationRuntimeException;
018    import org.apache.tapestry.BaseComponent;
019    import org.apache.tapestry.IForm;
020    import org.apache.tapestry.IMarkupWriter;
021    import org.apache.tapestry.IRequestCycle;
022    import org.apache.tapestry.form.Checkbox;
023    
024    /**
025     * @author mb
026     * @since 4.0
027     */
028    public abstract class ControlledCheckbox extends BaseComponent
029    {
030        public abstract CheckboxGroup getGroup();
031        
032        public String getCheckboxName()
033        {
034            Checkbox checkbox = (Checkbox) getComponent("checkbox");
035            String name = checkbox.getName();
036            return name;
037        }
038        
039        public IForm getForm()
040        {
041            Checkbox checkbox = (Checkbox) getComponent("checkbox");
042            IForm form = checkbox.getForm();
043            return form;
044        }
045        
046        /**
047         * @see org.apache.tapestry.BaseComponent#renderComponent(org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle)
048         */
049        protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
050        {
051            super.renderComponent(writer, cycle);
052            
053            registerCheckbox();
054        }
055    
056        protected void registerCheckbox()
057        {
058            getCheckboxGroup().registerControlledCheckbox(this);
059        }
060        
061        public CheckboxGroup getCheckboxGroup()
062        {
063            CheckboxGroup group = getGroup();
064            if (group == null) {
065                IRequestCycle cycle = getPage().getRequestCycle();
066                group = (CheckboxGroup) cycle.getAttribute(CheckboxGroup.CHECKBOX_GROUP_ATTRIBUTE);
067            }
068            if (group == null)
069                throw new ApplicationRuntimeException("The component " + getExtendedId() + " must be wrapped by a CheckboxGroup or the 'group' parameter must be set.");
070    
071            return group;
072        }
073    
074    }