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package net.sf.cuf.model;

/**
 * Helper class to monitor if the index points inside a the list or not.
 * This class is used by IndexedAdapter and SelectionInList.
 */
class IndexValidHolder extends ValueHolder
{
    /**
     * Creates a new IndexValidHolder with the given index.
     * @param pIndex the initial index.
     */
    IndexValidHolder(final int pIndex)
    {
        setIndex(pIndex);
    }

    /**
     * Set the index.
     * @param pIndex index, we assume that the boundary condition (the index is
     *               inside the list) is checked by the users of this class.
     */
    void setIndex(final int pIndex)
    {
        checkDisposed();
        if (pIndex==IndexProvider.NO_SELECTION)
            super.setValue(Boolean.FALSE);
        else
            super.setValue(Boolean.TRUE);
    }

    /**
     * This value model can't be changed by setValue().
     * @param pValue not used
     * @throws UnsupportedOperationException always thrown
     */
    public void setValue(final Boolean pValue)
    {
        throw new UnsupportedOperationException("a IndexValidHolder is not mutable" +
                                                " from outside, can't set value "+pValue);
    }
}