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java/org/apache/jasper/compiler/ELNode.java
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270
java/org/apache/jasper/compiler/ELNode.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.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import javax.servlet.jsp.tagext.FunctionInfo;
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import org.apache.jasper.JasperException;
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/**
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* This class defines internal representation for an EL Expression
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*
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* It currently only defines functions. It can be expanded to define
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* all the components of an EL expression, if need to.
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*
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* @author Kin-man Chung
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*/
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abstract class ELNode {
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public abstract void accept(Visitor v) throws JasperException;
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/**
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* Represents an EL expression: anything in ${ and }.
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*/
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public static class Root extends ELNode {
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private final ELNode.Nodes expr;
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private final char type;
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Root(ELNode.Nodes expr, char type) {
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this.expr = expr;
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this.type = type;
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}
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@Override
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public void accept(Visitor v) throws JasperException {
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v.visit(this);
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}
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public ELNode.Nodes getExpression() {
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return expr;
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}
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public char getType() {
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return type;
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}
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}
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/**
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* Represents text outside of EL expression.
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*/
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public static class Text extends ELNode {
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private final String text;
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Text(String text) {
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this.text = text;
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}
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@Override
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public void accept(Visitor v) throws JasperException {
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v.visit(this);
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}
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public String getText() {
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return text;
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}
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}
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/**
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* Represents anything in EL expression, other than functions, including
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* function arguments etc
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*/
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public static class ELText extends ELNode {
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private final String text;
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ELText(String text) {
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this.text = text;
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}
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@Override
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public void accept(Visitor v) throws JasperException {
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v.visit(this);
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}
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public String getText() {
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return text;
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}
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}
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/**
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* Represents a function
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* Currently only include the prefix and function name, but not its
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* arguments.
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*/
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public static class Function extends ELNode {
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private final String prefix;
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private final String name;
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private final String originalText;
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private String uri;
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private FunctionInfo functionInfo;
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private String methodName;
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private String[] parameters;
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Function(String prefix, String name, String originalText) {
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this.prefix = prefix;
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this.name = name;
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this.originalText = originalText;
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}
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@Override
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public void accept(Visitor v) throws JasperException {
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v.visit(this);
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}
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public String getPrefix() {
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return prefix;
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}
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public String getName() {
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return name;
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}
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public String getOriginalText() {
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return originalText;
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}
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public void setUri(String uri) {
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this.uri = uri;
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}
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public String getUri() {
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return uri;
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}
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public void setFunctionInfo(FunctionInfo f) {
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this.functionInfo = f;
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}
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public FunctionInfo getFunctionInfo() {
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return functionInfo;
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}
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public void setMethodName(String methodName) {
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this.methodName = methodName;
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}
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public String getMethodName() {
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return methodName;
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}
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public void setParameters(String[] parameters) {
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this.parameters = parameters;
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}
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public String[] getParameters() {
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return parameters;
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}
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}
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/**
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* An ordered list of ELNode.
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*/
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public static class Nodes {
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/* Name used for creating a map for the functions in this
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EL expression, for communication to Generator.
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*/
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private String mapName = null; // The function map associated this EL
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private final List<ELNode> list;
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public Nodes() {
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list = new ArrayList<>();
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}
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public void add(ELNode en) {
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list.add(en);
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}
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/**
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* Visit the nodes in the list with the supplied visitor.
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*
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* @param v The visitor used
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*
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* @throws JasperException if an error occurs while visiting a node
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*/
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public void visit(Visitor v) throws JasperException {
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for (ELNode n : list) {
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n.accept(v);
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}
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}
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public Iterator<ELNode> iterator() {
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return list.iterator();
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}
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public boolean isEmpty() {
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return list.size() == 0;
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}
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/**
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* @return true if the expression contains a ${...}
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*/
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public boolean containsEL() {
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for (ELNode n : list) {
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if (n instanceof Root) {
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return true;
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}
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}
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return false;
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}
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public void setMapName(String name) {
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this.mapName = name;
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}
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public String getMapName() {
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return mapName;
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}
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}
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/*
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* A visitor class for traversing ELNodes
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*/
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public static class Visitor {
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public void visit(Root n) throws JasperException {
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n.getExpression().visit(this);
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}
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@SuppressWarnings("unused")
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public void visit(Function n) throws JasperException {
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// NOOP by default
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}
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@SuppressWarnings("unused")
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public void visit(Text n) throws JasperException {
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// NOOP by default
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}
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@SuppressWarnings("unused")
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public void visit(ELText n) throws JasperException {
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// NOOP by default
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}
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}
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}
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