alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Struts example source code file (ValueExpressionLiteral.java)

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

Java - Struts tags/keywords

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

The Struts ValueExpressionLiteral.java 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
 * 
 *      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.struts2.el;

import java.io.Externalizable;
import java.io.IOException;
import javax.el.ELContext;
import javax.el.PropertyNotWritableException;

import java.io.ObjectInput;
import java.io.ObjectOutput;

import javax.el.ValueExpression;

import org.apache.struts2.el.lang.ELSupport;
import org.apache.struts2.el.util.MessageFactory;
import org.apache.struts2.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() {
        super();
    }

    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
                .equals(ve.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.writeObject(this.value);
        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 Struts examples (source code examples)

Here is a short list of links related to this Struts ValueExpressionLiteral.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.