net.customware.license.support.restriction.TimestampRestriction Maven / Gradle / Ivy

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package net.customware.license.support.restriction;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import net.customware.license.support.simple.SimpleLicenseContent;
import net.customware.license.support.simple.SimpleRestriction;
import net.customware.license.support.simple.SimpleRestrictionException;

/**
 * This validates that the license has a timestamp which is after the
 * timestamp for the validator. This ensures that the license is more recent
 * than the licensee.
 * 
 * @author David Peterson
 */
public class TimestampRestriction extends SimpleRestriction {
    private long timestamp;

    public TimestampRestriction( String timestamp, String format ) {
        SimpleDateFormat df = new SimpleDateFormat( format );
        try {
            this.timestamp = df.parse( timestamp ).getTime();
        } catch ( ParseException e ) {
            throw new IllegalArgumentException( "Invalid timestamp for the specified format: " + timestamp );
        }
    }

    public TimestampRestriction( Date timestamp ) {
        this.timestamp = timestamp.getTime();
    }

    public TimestampRestriction( long timestamp ) {
        this.timestamp = timestamp;
    }

    @Override protected void checkRestriction( Object context, SimpleLicenseContent content, Object attributeValue )
            throws SimpleRestrictionException {
        // If we don't have a specific timestamp to check, just pass it through.
        if ( timestamp <= 0 )
            return;
        
        // If no timestamp was set to check, continue on.
        if ( attributeValue == null )
            return;

        long cTimestamp = getTimestamp( attributeValue );
        if ( cTimestamp <= 0 )
            throw new SimpleRestrictionException( "The license does not provide a timestamp." );

        if ( cTimestamp < timestamp )
            throw new SimpleRestrictionException( "The license timestamp is too old." );
    }

    public static boolean setTimestamp( SimpleLicenseContent content, long timestamp ) {
        return content.setAttribute( TimestampRestriction.class, new Long( timestamp ) );
    }

    public static long getTimestamp( Object attributeValue ) {
        Long timestamp = ( Long ) attributeValue;
        return timestamp == null ? -1L : timestamp.longValue();
    }

}