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package javax.faces.component.visit;

import java.util.Collection;
import java.util.Set;

import javax.faces.FacesWrapper;
import javax.faces.context.FacesContext;

/**
 * Provide for separation of interface and
 * implementation for the {@link VisitContext} contract.
 *
 * Usage: extend this class and push the implementation being wrapped to the
 * constructor and use {@link #getWrapped} to access the instance being wrapped.
 *
 * @since 2.0
 */
public abstract class VisitContextFactory implements FacesWrapper {

    private VisitContextFactory wrapped;

    /**
     * @deprecated Use the other constructor taking the implementation being wrapped.
     */
    @Deprecated
    public VisitContextFactory() {

    }

    /**
     * If this factory has been decorated,
     * the implementation doing the decorating should push the implementation being wrapped to this constructor.
     * The {@link #getWrapped()} will then return the implementation being wrapped.
     *
     * @param wrapped The implementation being wrapped.
     */
    public VisitContextFactory(VisitContextFactory wrapped) {
        this.wrapped = wrapped;
    }

    /**
     * If this factory has been decorated, the
     * implementation doing the decorating may override this method to provide
     * access to the implementation being wrapped.
     */
    @Override
    public VisitContextFactory getWrapped() {
        return wrapped;
    }


    /**
     * Return a new {@link VisitContext}
     * instance.
     * @param context the FacesContext for this request.
     * @param ids a Collection of clientIds to visit.  If
     * null all components will be visited.
     * @param hints the VisitHints that apply to this
     * visit.
     *
     *  @return the instance of VisitContext.
     *
     * @since 2.0
     */
    public abstract VisitContext getVisitContext(FacesContext context,
            Collection ids, Set hints);

}