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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.impl;

import org.directwebremoting.extend.FileGenerator;

/**
 * A helper to aid implementing {@link FileGenerator} that takes care of the
 * filename and mimeType fields
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public abstract class AbstractFileGenerator implements FileGenerator
{
    /**
     * Setup the filename and mimeType
     */
    public AbstractFileGenerator(String filename, String mimeType)
    {
        this.filename = filename;
        this.mimeType = mimeType;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.FileGenerator#getFilename()
     */
    public String getFilename()
    {
        return filename;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.FileGenerator#getMimeType()
     */
    public String getMimeType()
    {
        return mimeType;
    }

    /**
     * Sometimes the filename is user visible when downloading
     */
    private String filename;

    /**
     * The mime type in case the browser needs to do something with the file
     */
    private String mimeType;
}