| /* |
| * Copyright 1999,2004 The Apache Software Foundation. |
| * |
| * Licensed 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.compiler; |
| |
| import java.util.*; |
| import javax.servlet.jsp.tagext.*; |
| import org.apache.jasper.JasperException; |
| |
| /** |
| * 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)); |
| } |
| } |