/* | |
* 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.compiler; | |
import org.apache.struts2.jasper.JasperException; | |
import javax.servlet.jsp.tagext.TagVariableInfo; | |
import javax.servlet.jsp.tagext.VariableInfo; | |
import java.util.Hashtable; | |
import java.util.Vector; | |
/** | |
* Class responsible for determining the scripting variables that every | |
* custom action needs to declare. | |
* | |
* @author Jan Luehe | |
*/ | |
class ScriptingVariabler { | |
private static final Integer MAX_SCOPE = new Integer(Integer.MAX_VALUE); | |
/* | |
* Assigns an identifier (of type integer) to every custom tag, in order | |
* to help identify, for every custom tag, the scripting variables that it | |
* needs to declare. | |
*/ | |
static class CustomTagCounter extends Node.Visitor { | |
private int count; | |
private Node.CustomTag parent; | |
public void visit(Node.CustomTag n) throws JasperException { | |
n.setCustomTagParent(parent); | |
Node.CustomTag tmpParent = parent; | |
parent = n; | |
visitBody(n); | |
parent = tmpParent; | |
n.setNumCount(new Integer(count++)); | |
} | |
} | |
/* | |
* For every custom tag, determines the scripting variables it needs to | |
* declare. | |
*/ | |
static class ScriptingVariableVisitor extends Node.Visitor { | |
private ErrorDispatcher err; | |
private Hashtable scriptVars; | |
public ScriptingVariableVisitor(ErrorDispatcher err) { | |
this.err = err; | |
scriptVars = new Hashtable(); | |
} | |
public void visit(Node.CustomTag n) throws JasperException { | |
setScriptingVars(n, VariableInfo.AT_BEGIN); | |
setScriptingVars(n, VariableInfo.NESTED); | |
visitBody(n); | |
setScriptingVars(n, VariableInfo.AT_END); | |
} | |
private void setScriptingVars(Node.CustomTag n, int scope) | |
throws JasperException { | |
TagVariableInfo[] tagVarInfos = n.getTagVariableInfos(); | |
VariableInfo[] varInfos = n.getVariableInfos(); | |
if (tagVarInfos.length == 0 && varInfos.length == 0) { | |
return; | |
} | |
Vector vec = new Vector(); | |
Integer ownRange = null; | |
if (scope == VariableInfo.AT_BEGIN | |
|| scope == VariableInfo.AT_END) { | |
Node.CustomTag parent = n.getCustomTagParent(); | |
if (parent == null) | |
ownRange = MAX_SCOPE; | |
else | |
ownRange = parent.getNumCount(); | |
} else { | |
// NESTED | |
ownRange = n.getNumCount(); | |
} | |
if (varInfos.length > 0) { | |
for (int i=0; i<varInfos.length; i++) { | |
if (varInfos[i].getScope() != scope | |
|| !varInfos[i].getDeclare()) { | |
continue; | |
} | |
String varName = varInfos[i].getVarName(); | |
Integer currentRange = (Integer) scriptVars.get(varName); | |
if (currentRange == null | |
|| ownRange.compareTo(currentRange) > 0) { | |
scriptVars.put(varName, ownRange); | |
vec.add(varInfos[i]); | |
} | |
} | |
} else { | |
for (int i=0; i<tagVarInfos.length; i++) { | |
if (tagVarInfos[i].getScope() != scope | |
|| !tagVarInfos[i].getDeclare()) { | |
continue; | |
} | |
String varName = tagVarInfos[i].getNameGiven(); | |
if (varName == null) { | |
varName = n.getTagData().getAttributeString( | |
tagVarInfos[i].getNameFromAttribute()); | |
if (varName == null) { | |
err.jspError(n, "jsp.error.scripting.variable.missing_name", | |
tagVarInfos[i].getNameFromAttribute()); | |
} | |
} | |
Integer currentRange = (Integer) scriptVars.get(varName); | |
if (currentRange == null | |
|| ownRange.compareTo(currentRange) > 0) { | |
scriptVars.put(varName, ownRange); | |
vec.add(tagVarInfos[i]); | |
} | |
} | |
} | |
n.setScriptingVars(vec, scope); | |
} | |
} | |
public static void set(Node.Nodes page, ErrorDispatcher err) | |
throws JasperException { | |
page.visit(new CustomTagCounter()); | |
page.visit(new ScriptingVariableVisitor(err)); | |
} | |
} |