public PrefixedObjectValueSource(String prefix, Object root) {
            super(new PrefixedValueSourceWrapper(new ObjectBasedValueSource(root), prefix));
        }

        /**
         * Wrap the specified root object, allowing the specified list of expression
         * prefixes and setting whether the {@link PrefixedValueSourceWrapper} allows
         * unprefixed expressions.

import org.codehaus.plexus.interpolation.PrefixAwareRecursionInterceptor;
import org.codehaus.plexus.interpolation.PrefixedObjectValueSource;
import org.codehaus.plexus.interpolation.PrefixedValueSourceWrapper;
import org.codehaus.plexus.interpolation.RecursionInterceptor;
import org.codehaus.plexus.interpolation.ValueSource;
import org.codehaus.plexus.logging.AbstractLogEnabled;
import org.codehaus.plexus.logging.Logger;