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package net.customware.license.support.util;

import java.util.prefs.AbstractPreferences;
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;

/**
 * This is an incomplete implementation of the Preferences API, with only enough
 * completed to allow license key storage. This is useful if you wish to store
 * the license key somewhere, but don't want to implement the full Preferences
 * API.
 * 
 * @author David Peterson
 */
public abstract class AbstractLicensePreferences extends AbstractPreferences {
    protected AbstractLicensePreferences() {
        super( null, "" );
    }

    protected AbstractLicensePreferences( AbstractLicensePreferences parent, String name ) {
        super( parent, name );
    }

    public Preferences nodeForPackage( Class clazz ) {
        StringBuffer path = new StringBuffer( "/" );

        String classname = clazz.getName();
        int lastDot = classname.lastIndexOf( '.' );
        if ( lastDot == -1 )
            path.append( "" );
        else
            path.append( classname.substring( 0, lastDot ).replaceAll( "\\.", "/" ) );

        return node( path.toString() );
    }

    /**
     * @return null.
     */
    @Override protected String[] childrenNamesSpi() throws BackingStoreException {
        return null;
    }

    /**
     * Does nothing.
     */
    @Override protected void flushSpi() throws BackingStoreException {
        // Does nothing.
    }

    /**
     * @return null.
     */
    @Override protected String[] keysSpi() throws BackingStoreException {
        return null;
    }

    /**
     * Does nothing.
     */
    @Override protected void removeNodeSpi() throws BackingStoreException {
        // Do nothing
    }

    /**
     * Does nothing.
     */
    @Override protected void syncSpi() throws BackingStoreException {
        // Do nothing
    }
}