/* | |
* 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.struts2.jasper.tagplugins.jstl.core; | |
import org.apache.struts2.jasper.compiler.tagplugin.TagPlugin; | |
import org.apache.struts2.jasper.compiler.tagplugin.TagPluginContext; | |
public class Param implements TagPlugin { | |
public void doTag(TagPluginContext ctxt) { | |
//don't support the body content | |
//define names of all the temp variables | |
String nameName = ctxt.getTemporaryVariableName(); | |
String valueName = ctxt.getTemporaryVariableName(); | |
String urlName = ctxt.getTemporaryVariableName(); | |
String encName = ctxt.getTemporaryVariableName(); | |
String index = ctxt.getTemporaryVariableName(); | |
//if the param tag has no parents, throw a exception | |
TagPluginContext parent = ctxt.getParentContext(); | |
if(parent == null){ | |
ctxt.generateJavaSource(" throw new JspTagExcption" + | |
"(\"<param> outside <import> or <urlEncode>\");"); | |
return; | |
} | |
//get the url string before adding this param | |
ctxt.generateJavaSource("String " + urlName + " = " + | |
"(String)pageContext.getAttribute(\"url_without_param\");"); | |
//get the value of "name" | |
ctxt.generateJavaSource("String " + nameName + " = "); | |
ctxt.generateAttribute("name"); | |
ctxt.generateJavaSource(";"); | |
//if the "name" is null then do nothing. | |
//else add such string "name=value" to the url. | |
//and the url should be encoded | |
ctxt.generateJavaSource("if(" + nameName + " != null && !" + nameName + ".equals(\"\")){"); | |
ctxt.generateJavaSource(" String " + valueName + " = "); | |
ctxt.generateAttribute("value"); | |
ctxt.generateJavaSource(";"); | |
ctxt.generateJavaSource(" if(" + valueName + " == null) " + valueName + " = \"\";"); | |
ctxt.generateJavaSource(" String " + encName + " = pageContext.getResponse().getCharacterEncoding();"); | |
ctxt.generateJavaSource(" " + nameName + " = java.net.URLEncoder.encode(" + nameName + ", " + encName + ");"); | |
ctxt.generateJavaSource(" " + valueName + " = java.net.URLEncoder.encode(" + valueName + ", " + encName + ");"); | |
ctxt.generateJavaSource(" int " + index + ";"); | |
ctxt.generateJavaSource(" " + index + " = " + urlName + ".indexOf(\'?\');"); | |
//if the current param is the first one, add a "?" ahead of it | |
//else add a "&" ahead of it | |
ctxt.generateJavaSource(" if(" + index + " == -1){"); | |
ctxt.generateJavaSource(" " + urlName + " = " + urlName + " + \"?\" + " + nameName + " + \"=\" + " + valueName + ";"); | |
ctxt.generateJavaSource(" }else{"); | |
ctxt.generateJavaSource(" " + urlName + " = " + urlName + " + \"&\" + " + nameName + " + \"=\" + " + valueName + ";"); | |
ctxt.generateJavaSource(" }"); | |
ctxt.generateJavaSource(" pageContext.setAttribute(\"url_without_param\"," + urlName + ");"); | |
ctxt.generateJavaSource("}"); | |
} | |
} |