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.wml; 016 017import org.apache.hivemind.HiveMind; 018import org.apache.tapestry.AbstractComponent; 019import org.apache.tapestry.IMarkupWriter; 020import org.apache.tapestry.IRequestCycle; 021 022/** 023 * The Timer element declares a card timer, which exposes a means of processing inactivity or idle 024 * time. The timer is initialised and started at card entry and is stopped when the card is exited. 025 * 026 * @author David Solis 027 * @since 3.0 028 */ 029 030public abstract class Timer extends AbstractComponent 031{ 032 /** 033 * @see AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle) 034 */ 035 036 protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) 037 { 038 boolean render = !cycle.isRewinding(); 039 040 if (render) 041 { 042 writer.beginEmpty("timer"); 043 044 writer.attribute("name", getName()); 045 046 String value = getValue(); 047 if (HiveMind.isNonBlank(value)) 048 writer.attribute("value", value); 049 else 050 writer.attribute("value", "0"); 051 052 renderInformalParameters(writer, cycle); 053 054 writer.closeTag(); 055 } 056 } 057 058 public abstract String getName(); 059 060 /** @since 4.0 */ 061 062 public abstract String getValue(); 063}