001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package examples; 018 019 import java.io.IOException; 020 021 import javax.servlet.jsp.JspException; 022 import javax.servlet.jsp.JspTagException; 023 024 /** 025 * Example1: the simplest tag 026 * Collect attributes and call into some actions 027 * <p/> 028 * <foo att1="..." att2="...." att3="...." /> 029 */ 030 031 public class FooTag 032 extends ExampleTagBase { 033 private String atts[] = new String[3]; 034 int i = 0; 035 036 private final void setAtt(int index, String value) { 037 atts[index] = value; 038 } 039 040 public void setAtt1(String value) { 041 setAtt(0, value); 042 } 043 044 public void setAtt2(String value) { 045 setAtt(1, value); 046 } 047 048 public void setAtt3(String value) { 049 setAtt(2, value); 050 } 051 052 /** 053 * Process start tag 054 * 055 * @return EVAL_BODY_INCLUDE 056 */ 057 public int doStartTag() throws JspException { 058 i = 0; 059 return EVAL_BODY_TAG; 060 } 061 062 public void doInitBody() throws JspException { 063 pageContext.setAttribute("member", atts[i]); 064 i++; 065 } 066 067 public int doAfterBody() throws JspException { 068 try { 069 if (i == 3) { 070 bodyOut.writeOut(bodyOut.getEnclosingWriter()); 071 return SKIP_BODY; 072 } else 073 pageContext.setAttribute("member", atts[i]); 074 i++; 075 return EVAL_BODY_TAG; 076 } catch (IOException ex) { 077 throw new JspTagException(ex.toString()); 078 } 079 } 080 } 081