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 org.apache.logging.log4j.taglib; 018 019 import javax.servlet.jsp.JspException; 020 import javax.servlet.jsp.PageContext; 021 import javax.servlet.jsp.tagext.Tag; 022 import javax.servlet.jsp.tagext.TagSupport; 023 import java.io.IOException; 024 import java.util.Enumeration; 025 026 /** 027 * This class implements the {@code <log:dump>} tag. 028 * 029 * @since 2.0 030 */ 031 public class DumpTag extends TagSupport { 032 private static final long serialVersionUID = 1L; 033 034 private int scope; 035 036 public DumpTag() { 037 super(); 038 init(); 039 } 040 041 @Override 042 public void release() { 043 super.release(); 044 this.init(); 045 } 046 047 private void init() { 048 this.scope = PageContext.PAGE_SCOPE; 049 } 050 051 public void setScope(String scope) { 052 this.scope = TagUtils.getScope(scope); 053 } 054 055 @Override 056 public int doEndTag() throws JspException { 057 try { 058 Enumeration<String> names = this.pageContext.getAttributeNamesInScope(this.scope); 059 this.pageContext.getOut().write("<dl>"); 060 while (names != null && names.hasMoreElements()) { 061 String name = names.nextElement(); 062 Object value = this.pageContext.getAttribute(name, this.scope); 063 064 this.pageContext.getOut().write("<dt><code>" + name + "</code></dt>"); 065 this.pageContext.getOut().write("<dd><code>" + value + "</code></dd>"); 066 } 067 this.pageContext.getOut().write("</dl>"); 068 } catch (IOException e) { 069 throw new JspException("Could not write scope contents. Cause: " + e.toString(), e); 070 } 071 072 return Tag.EVAL_PAGE; 073 } 074 }