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package com.sun.faces.component.visit;

import javax.faces.component.visit.*;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Set;

import javax.faces.component.NamingContainer;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;

/**
 *
 * A VisitContext implementation that is 
 * used when performing a full component tree visit.
 *
 * RELEASE_PENDING
 *
 * @since 2.0
 */
public class FullVisitContext extends VisitContext {

    /**
     * Creates a FullVisitorContext instance.
     * @param facesContext the FacesContext for the current request
     * @throws NullPointerException  if {@code facesContext}
     *                               is {@code null}
     */    
    public FullVisitContext(FacesContext facesContext) {
        this(facesContext, null);
    }

    /**
     * Creates a FullVisitorContext instance with the specified
     * hints.
     *
     * @param facesContext the FacesContext for the current request
     * @param hints a the VisitHints for this visit
     * @throws NullPointerException  if {@code facesContext}
     *                               is {@code null}
     */    
    public FullVisitContext(FacesContext facesContext,
                            Set hints) {

        if (facesContext == null) {
            throw new NullPointerException();
        }

        this.facesContext = facesContext;

        // Copy and store hints - ensure unmodifiable and non-empty
        EnumSet hintsEnumSet = ((hints == null) || (hints.isEmpty()))
                                          ? EnumSet.noneOf(VisitHint.class)
                                          : EnumSet.copyOf(hints);

        this.hints = Collections.unmodifiableSet(hintsEnumSet);
    }

    /**
     * @see VisitContext#getFacesContext VisitContext.getFacesContext()
     */
    @Override
    public FacesContext getFacesContext() {
        return facesContext;
    }

    /**
     * @see VisitContext#getIdsToVisit VisitContext.getIdsToVisit()
     */
    @Override
    public Collection getIdsToVisit() {

        // We always visits all ids
        return ALL_IDS;
    }

    /**
     * @see VisitContext#getSubtreeIdsToVisit VisitContext.getSubtreeIdsToVisit()
     */
    @Override
    public Collection getSubtreeIdsToVisit(UIComponent component) {

        // Make sure component is a NamingContainer
        if (!(component instanceof NamingContainer)) {
            throw new IllegalArgumentException("Component is not a NamingContainer: " + component);
        }

        // We always visits all ids
        return ALL_IDS;
    }

    /**
     * @see VisitContext#getHints VisitContext.getHints
     */
    @Override
    public Set getHints() {
        return hints;
    }

    /**
     * @see VisitContext#invokeVisitCallback VisitContext.invokeVisitCallback()
     */
    @Override
    public VisitResult invokeVisitCallback(UIComponent component, 
                                           VisitCallback callback) {

        // Nothing interesting here - just invoke the callback.
        // (PartialVisitContext.invokeVisitCallback() does all of the 
        // interesting work.)
        return callback.visit(this, component);
    }

    // The FacesContext for this request
    private FacesContext facesContext;

    // Our visit hints
    private Set hints;
}