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 * 
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 * 
 * Copyright 2002 - 2007 Adobe Systems Incorporated All Rights Reserved.
 * 
 * NOTICE: All information contained herein is, and remains the property of Adobe Systems Incorporated and its suppliers, if any. The intellectual and technical concepts contained herein are
 * proprietary to Adobe Systems Incorporated and its suppliers and may be covered by U.S. and Foreign Patents, patents in process, and are protected by trade secret or copyright law. Dissemination of
 * this information or reproduction of this material is strictly forbidden unless prior written permission is obtained from Adobe Systems Incorporated.
 **************************************************************************/
package flex.messaging.util;

import java.io.File;
import java.io.FileNotFoundException;

/**
 * Used by redeployment manager to monitor for changes to the files.
 * 
 * @exclude
 */
public class WatchedObject
{
    private String filename;
    private long modified;

    /**
     * Creates a watched object for the specified file.
     * 
     * @param filename
     *            file to watch
     * @throws FileNotFoundException
     *             when specified file could not be found
     */
    public WatchedObject(String filename) throws FileNotFoundException
    {
        this.filename = filename;
        File file = new File(filename);

        if (!file.isFile() && !file.isDirectory())
        {
            throw new FileNotFoundException();
        }
        this.modified = file.lastModified();
    }

    /**
     * Returns true if the watched file has been modified since creation of this watched object or since the last call to this method.
     * 
     * @return true if the watched file has been modified since creation of this watched object or since the last call to this method
     */
    public boolean isUptodate()
    {
        boolean uptodate = true;

        long current = new File(filename).lastModified();

        if (Math.abs(current - modified) > 1000)
        {
            uptodate = false;
        }

        modified = current;

        return uptodate;
    }
}