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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * 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.directwebremoting.convert;

import java.lang.reflect.Method;

import org.directwebremoting.extend.MarshallException;
import org.directwebremoting.extend.Property;
import org.directwebremoting.util.Logger;

/**
 * An implementation of {@link Property} that simply uses stored values.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class PlainProperty implements Property
{
    /**
     * @param name The property name
     * @param value The property value irrespective of the object that we read it on
     */
    public PlainProperty(String name, Object value)
    {
        this.name = name;
        this.value = value;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getName()
     */
    public String getName()
    {
        return name;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getPropertyType()
     */
    public Class getPropertyType()
    {
        return value.getClass();
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getSetter()
     */
    public Method getSetter()
    {
        return null;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getValue(java.lang.Object)
     */
    public Object getValue(Object bean) throws MarshallException
    {
        return value;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#setValue(java.lang.Object, java.lang.Object)
     */
    public void setValue(Object bean, Object value) throws MarshallException
    {
        log.warn("Attempt to setValue() on plain property.");
    }

    /**
     * The name of this property
     */
    private String name;

    /**
     * The property value irrespective of the object that we read it on
     */
    private Object value;

    /**
     * The log stream
     */
    private static final Logger log = Logger.getLogger(PlainProperty.class);
}