| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| |
| package org.apache.jasper.tagplugins.jstl.core; |
| |
| import org.apache.jasper.compiler.tagplugin.TagPlugin; |
| import org.apache.jasper.compiler.tagplugin.TagPluginContext; |
| |
| public class Redirect implements TagPlugin { |
| |
| public void doTag(TagPluginContext ctxt) { |
| |
| //flag for the existence of the "context" |
| boolean hasContext = ctxt.isAttributeSpecified("context"); |
| |
| //names of the temp variables |
| String urlName = ctxt.getTemporaryVariableName(); |
| String contextName = ctxt.getTemporaryVariableName(); |
| String baseUrlName = ctxt.getTemporaryVariableName(); |
| String resultName = ctxt.getTemporaryVariableName(); |
| String responseName = ctxt.getTemporaryVariableName(); |
| |
| //get context |
| ctxt.generateJavaSource("String " + contextName + " = null;"); |
| if(hasContext){ |
| ctxt.generateJavaSource(contextName + " = "); |
| ctxt.generateAttribute("context"); |
| ctxt.generateJavaSource(";"); |
| } |
| |
| //get the url |
| ctxt.generateJavaSource("String " + urlName + " = "); |
| ctxt.generateAttribute("url"); |
| ctxt.generateJavaSource(";"); |
| |
| //get the raw url according to "url" and "context" |
| ctxt.generateJavaSource("String " + baseUrlName + " = " + |
| "org.apache.jasper.tagplugins.jstl.Util.resolveUrl(" + urlName + ", " + contextName + ", pageContext);"); |
| ctxt.generateJavaSource("pageContext.setAttribute" + |
| "(\"url_without_param\", " + baseUrlName + ");"); |
| |
| //add params |
| ctxt.generateBody(); |
| |
| ctxt.generateJavaSource("String " + resultName + " = " + |
| "(String)pageContext.getAttribute(\"url_without_param\");"); |
| ctxt.generateJavaSource("pageContext.removeAttribute" + |
| "(\"url_without_param\");"); |
| |
| //get the response object |
| ctxt.generateJavaSource("HttpServletResponse " + responseName + " = " + |
| "((HttpServletResponse) pageContext.getResponse());"); |
| |
| //if the url is relative, encode it |
| ctxt.generateJavaSource("if(!org.apache.jasper.tagplugins.jstl.Util.isAbsoluteUrl(" + resultName + ")){"); |
| ctxt.generateJavaSource(" " + resultName + " = " |
| + responseName + ".encodeRedirectURL(" + resultName + ");"); |
| ctxt.generateJavaSource("}"); |
| |
| //do redirect |
| ctxt.generateJavaSource("try{"); |
| ctxt.generateJavaSource(" " + responseName + ".sendRedirect(" + resultName + ");"); |
| ctxt.generateJavaSource("}catch(java.io.IOException ex){"); |
| ctxt.generateJavaSource(" throw new JspTagException(ex.toString(), ex);"); |
| ctxt.generateJavaSource("}"); |
| } |
| |
| } |