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Tomcat example source code file (

This example Tomcat source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

class, class, classnotfoundexception, externalizable, io, ioexception, ioexception, object, object, string, valueexpression, valueexpressionliteral, valueexpressionliteral

The Tomcat source code

 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.el;

import javax.el.ELContext;
import javax.el.PropertyNotWritableException;


import javax.el.ValueExpression;

import org.apache.el.lang.ELSupport;
import org.apache.el.util.MessageFactory;
import org.apache.el.util.ReflectionUtil;

public final class ValueExpressionLiteral extends ValueExpression implements
        Externalizable {

    private static final long serialVersionUID = 1L;

    private Object value;

    private Class expectedType;

    public ValueExpressionLiteral() {
    public ValueExpressionLiteral(Object value, Class expectedType) {
        this.value = value;
        this.expectedType = expectedType;

    public Object getValue(ELContext context) {
        if (this.expectedType != null) {
            return ELSupport.coerceToType(this.value, this.expectedType);
        return this.value;

    public void setValue(ELContext context, Object value) {
        throw new PropertyNotWritableException(MessageFactory.get(
                "error.value.literal.write", this.value));

    public boolean isReadOnly(ELContext context) {
        return true;

    public Class getType(ELContext context) {
        return (this.value != null) ? this.value.getClass() : null;

    public Class getExpectedType() {
        return this.expectedType;

    public String getExpressionString() {
        return (this.value != null) ? this.value.toString() : null;

    public boolean equals(Object obj) {
        return (obj instanceof ValueExpressionLiteral && this
                .equals((ValueExpressionLiteral) obj));

    public boolean equals(ValueExpressionLiteral ve) {
        return (ve != null && (this.value != null && ve.value != null && (this.value == ve.value || this.value

    public int hashCode() {
        return (this.value != null) ? this.value.hashCode() : 0;

    public boolean isLiteralText() {
        return true;

    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeUTF((this.expectedType != null) ? this.expectedType.getName()
                : "");

    public void readExternal(ObjectInput in) throws IOException,
            ClassNotFoundException {
        this.value = in.readObject();
        String type = in.readUTF();
        if (!"".equals(type)) {
            this.expectedType = ReflectionUtil.forName(type);

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat source code file:

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