/*************************************************************************
 *
 *  The Contents of this file are made available subject to the terms of
 *  the BSD license.
 *  
 *  Copyright 2000, 2010 Oracle and/or its affiliates.
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 *
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 *  modification, are permitted provided that the following conditions
 *  are met:
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 *     notice, this list of conditions and the following disclaimer.
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
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import com.sun.star.uno.*;
import com.sun.star.container.*;
import com.sun.star.lang.*;

/**************************************************************************/
/** an abstract interface for components doing an action on a form component
*/
interface IFormComponentAction
{
    public abstract void handle( Object aFormComponent ) throws java.lang.Exception;
};

/**************************************************************************/
/** a helper class for travelling a form component tree
*/
class ComponentTreeTraversal implements IFormComponentAction
{
    /* ------------------------------------------------------------------ */
    /** Indicator method to decide wether to step down the tree.

        <p>The default implementation checks if the container given is a grid
        control model or a <service scope="com.sun.star.form">FormComponents</service>
        instance.</p>
    */
    protected boolean shouldStepInto( XIndexContainer xContainer ) throws com.sun.star.uno.Exception
    {
        // step down the tree, if possible
        XServiceInfo xSI = UNO.queryServiceInfo( xContainer );
        if	(	null != xSI
            &&	(	xSI.supportsService( "com.sun.star.form.FormComponents" )
                ||	xSI.supportsService( "com.sun.star.form.component.GridControl" )
                )
            )
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    /* ------------------------------------------------------------------ */
    public void handle( Object aFormComponent ) throws com.sun.star.uno.Exception
    {
        XIndexContainer xCont = UNO.queryIndexContainer( aFormComponent );
        if	(	( null != xCont )
            &&	shouldStepInto( xCont )
            )
        {
            for ( int i=0; i<xCont.getCount(); ++i )
            {
                handle( xCont.getByIndex( i ) );
            }
        }
    }
}