/*
* 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));
}
}
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