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331
java/org/apache/jasper/compiler/ELFunctionMapper.java
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331
java/org/apache/jasper/compiler/ELFunctionMapper.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.jasper.compiler;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import javax.servlet.jsp.tagext.FunctionInfo;
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import org.apache.jasper.Constants;
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import org.apache.jasper.JasperException;
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import org.apache.tomcat.util.security.PrivilegedGetTccl;
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/**
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* This class generates functions mappers for the EL expressions in the page.
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* Instead of a global mapper, a mapper is used for each call to EL
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* evaluator, thus avoiding the prefix overlapping and redefinition
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* issues.
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*
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* @author Kin-man Chung
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*/
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public class ELFunctionMapper {
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private int currFunc = 0;
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private StringBuilder ds; // Contains codes to initialize the functions mappers.
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private StringBuilder ss; // Contains declarations of the functions mappers.
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/**
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* Creates the functions mappers for all EL expressions in the JSP page.
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*
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* @param page The current compilation unit.
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* @throws JasperException EL error
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*/
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public static void map(Node.Nodes page)
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throws JasperException {
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ELFunctionMapper map = new ELFunctionMapper();
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map.ds = new StringBuilder();
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map.ss = new StringBuilder();
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page.visit(map.new ELFunctionVisitor());
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// Append the declarations to the root node
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String ds = map.ds.toString();
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if (ds.length() > 0) {
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Node root = page.getRoot();
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@SuppressWarnings("unused")
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Node unused = new Node.Declaration(map.ss.toString(), null, root);
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unused = new Node.Declaration(
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"static {\n" + ds + "}\n", null, root);
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}
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}
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/**
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* A visitor for the page. The places where EL is allowed are scanned
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* for functions, and if found functions mappers are created.
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*/
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private class ELFunctionVisitor extends Node.Visitor {
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/**
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* Use a global name map to facilitate reuse of function maps.
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* The key used is prefix:function:uri.
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*/
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private final HashMap<String, String> gMap = new HashMap<>();
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@Override
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public void visit(Node.ParamAction n) throws JasperException {
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doMap(n.getValue());
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visitBody(n);
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}
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@Override
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public void visit(Node.IncludeAction n) throws JasperException {
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doMap(n.getPage());
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visitBody(n);
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}
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@Override
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public void visit(Node.ForwardAction n) throws JasperException {
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doMap(n.getPage());
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visitBody(n);
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}
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@Override
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public void visit(Node.SetProperty n) throws JasperException {
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doMap(n.getValue());
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visitBody(n);
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}
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@Override
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public void visit(Node.UseBean n) throws JasperException {
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doMap(n.getBeanName());
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visitBody(n);
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}
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@Override
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public void visit(Node.PlugIn n) throws JasperException {
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doMap(n.getHeight());
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doMap(n.getWidth());
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visitBody(n);
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}
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@Override
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public void visit(Node.JspElement n) throws JasperException {
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Node.JspAttribute[] attrs = n.getJspAttributes();
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for (int i = 0; attrs != null && i < attrs.length; i++) {
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doMap(attrs[i]);
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}
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doMap(n.getNameAttribute());
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visitBody(n);
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}
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@Override
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public void visit(Node.UninterpretedTag n) throws JasperException {
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Node.JspAttribute[] attrs = n.getJspAttributes();
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for (int i = 0; attrs != null && i < attrs.length; i++) {
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doMap(attrs[i]);
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}
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visitBody(n);
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}
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@Override
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public void visit(Node.CustomTag n) throws JasperException {
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Node.JspAttribute[] attrs = n.getJspAttributes();
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for (int i = 0; attrs != null && i < attrs.length; i++) {
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doMap(attrs[i]);
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}
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visitBody(n);
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}
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@Override
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public void visit(Node.ELExpression n) throws JasperException {
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doMap(n.getEL());
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}
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private void doMap(Node.JspAttribute attr)
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throws JasperException {
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if (attr != null) {
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doMap(attr.getEL());
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}
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}
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/**
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* Creates function mappers, if needed, from ELNodes
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*/
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private void doMap(ELNode.Nodes el)
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throws JasperException {
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// Only care about functions in ELNode's
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class Fvisitor extends ELNode.Visitor {
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private final List<ELNode.Function> funcs = new ArrayList<>();
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private final Set<String> keySet = new HashSet<>();
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@Override
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public void visit(ELNode.Function n) throws JasperException {
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String key = n.getPrefix() + ":" + n.getName();
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if (keySet.add(key)) {
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funcs.add(n);
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}
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}
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}
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if (el == null) {
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return;
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}
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// First locate all unique functions in this EL
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Fvisitor fv = new Fvisitor();
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el.visit(fv);
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List<ELNode.Function> functions = fv.funcs;
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if (functions.size() == 0) {
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return;
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}
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// Reuse a previous map if possible
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String decName = matchMap(functions);
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if (decName != null) {
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el.setMapName(decName);
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return;
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}
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// Generate declaration for the map statically
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decName = getMapName();
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ss.append("private static org.apache.jasper.runtime.ProtectedFunctionMapper " + decName + ";\n");
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ds.append(" " + decName + "= ");
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ds.append("org.apache.jasper.runtime.ProtectedFunctionMapper");
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// Special case if there is only one function in the map
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String funcMethod = null;
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if (functions.size() == 1) {
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funcMethod = ".getMapForFunction";
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} else {
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ds.append(".getInstance();\n");
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funcMethod = " " + decName + ".mapFunction";
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}
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// Setup arguments for either getMapForFunction or mapFunction
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for (ELNode.Function f : functions) {
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FunctionInfo funcInfo = f.getFunctionInfo();
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String fnQName = f.getPrefix() + ":" + f.getName();
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if (funcInfo == null) {
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// Added via Lambda or ImportHandler. EL will expect a
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// function mapper even if one isn't used so just pass null
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ds.append(funcMethod + "(null, null, null, null);\n");
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} else {
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ds.append(funcMethod + "(\"" + fnQName + "\", " +
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getCanonicalName(funcInfo.getFunctionClass()) +
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".class, " + '\"' + f.getMethodName() + "\", " +
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"new Class[] {");
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String params[] = f.getParameters();
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for (int k = 0; k < params.length; k++) {
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if (k != 0) {
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ds.append(", ");
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}
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int iArray = params[k].indexOf('[');
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if (iArray < 0) {
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ds.append(params[k] + ".class");
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}
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else {
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String baseType = params[k].substring(0, iArray);
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ds.append("java.lang.reflect.Array.newInstance(");
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ds.append(baseType);
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ds.append(".class,");
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// Count the number of array dimension
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int aCount = 0;
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for (int jj = iArray; jj < params[k].length(); jj++ ) {
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if (params[k].charAt(jj) == '[') {
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aCount++;
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}
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}
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if (aCount == 1) {
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ds.append("0).getClass()");
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} else {
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ds.append("new int[" + aCount + "]).getClass()");
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}
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}
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}
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ds.append("});\n");
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}
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// Put the current name in the global function map
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gMap.put(fnQName + ':' + f.getUri(), decName);
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}
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el.setMapName(decName);
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}
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/**
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* Find the name of the function mapper for an EL. Reuse a
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* previously generated one if possible.
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* @param functions A List of ELNode.Function instances that
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* represents the functions in an EL
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* @return A previous generated function mapper name that can be used
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* by this EL; null if none found.
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*/
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private String matchMap(List<ELNode.Function> functions) {
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String mapName = null;
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for (ELNode.Function f : functions) {
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String temName = gMap.get(f.getPrefix() + ':' + f.getName() +
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':' + f.getUri());
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if (temName == null) {
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return null;
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}
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if (mapName == null) {
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mapName = temName;
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} else if (!temName.equals(mapName)) {
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// If not all in the previous match, then no match.
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return null;
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}
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}
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return mapName;
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}
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/*
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* @return A unique name for a function mapper.
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*/
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private String getMapName() {
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return "_jspx_fnmap_" + currFunc++;
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}
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/**
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* Convert a binary class name into a canonical one that can be used
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* when generating Java source code.
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*
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* @param className Binary class name
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* @return Canonical equivalent
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*/
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private String getCanonicalName(String className) throws JasperException {
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Class<?> clazz;
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ClassLoader tccl;
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if (Constants.IS_SECURITY_ENABLED) {
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PrivilegedAction<ClassLoader> pa = new PrivilegedGetTccl();
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tccl = AccessController.doPrivileged(pa);
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} else {
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tccl = Thread.currentThread().getContextClassLoader();
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}
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try {
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clazz = Class.forName(className, false, tccl);
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} catch (ClassNotFoundException e) {
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throw new JasperException(e);
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}
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return clazz.getCanonicalName();
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}
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}
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}
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