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.components; 016 017import org.apache.hivemind.HiveMind; 018import org.apache.tapestry.AbstractComponent; 019import org.apache.tapestry.IMarkupWriter; 020import org.apache.tapestry.IRequestCycle; 021 022/** 023 * @author mb 024 */ 025public abstract class ElseBean extends AbstractComponent 026{ 027 public abstract String getElement(); 028 029 protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) 030 { 031 Object conditionObject = cycle.getAttribute(IfBean.IF_VALUE_ATTRIBUTE); 032 033 if (conditionObject instanceof Boolean && !((Boolean) conditionObject).booleanValue()) 034 { 035 String element = getElement(); 036 037 boolean render = !cycle.isRewinding() && HiveMind.isNonBlank(element); 038 039 if (render) 040 { 041 writer.begin(element); 042 renderInformalParameters(writer, cycle); 043 } 044 045 renderBody(writer, cycle); 046 047 if (render) 048 writer.end(element); 049 } 050 } 051}