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.wml; 016 017 import org.apache.hivemind.HiveMind; 018 import org.apache.tapestry.AbstractComponent; 019 import org.apache.tapestry.IMarkupWriter; 020 import org.apache.tapestry.IRequestCycle; 021 022 /** 023 * The setvar element specifies the variable to set in the current browser context as a side effect 024 * of executing a task. 025 * 026 * @author David Solis 027 * @since 3.0 028 */ 029 030 public abstract class Setvar extends AbstractComponent 031 { 032 /** 033 * @see AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle) 034 */ 035 036 protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) 037 { 038 if (cycle.isRewinding()) 039 return; 040 041 writer.beginEmpty("setvar"); 042 043 writer.attribute("name", getName()); 044 045 renderInformalParameters(writer, cycle); 046 047 String value = getValue(); 048 049 if (HiveMind.isNonBlank(value)) 050 writer.attribute("value", value); 051 else 052 writer.attribute("value", ""); 053 054 writer.closeTag(); 055 } 056 057 public abstract String getName(); 058 059 public abstract String getValue(); 060 }