/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
 * or http://forgerock.org/license/CDDLv1.0.html.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at legal-notices/CDDLv1_0.txt.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2008 Sun Microsystems, Inc.
 */
package org.forgerock.opendj.config;

/**
 * A default behavior provider which retrieves default values from a parent
 * managed object. It should be used by properties which inherit their default
 * value(s) from properties held in an other managed object.
 *
 * @param <T>
 *            The type of values represented by this provider.
 */
public final class RelativeInheritedDefaultBehaviorProvider<T> extends DefaultBehaviorProvider<T> {

    /** The type of managed object expected at the relative offset. */
    private final AbstractManagedObjectDefinition<?, ?> d;

    /**
     * The relative offset (where 1 = parent, 2 = grandparent) of the
     * managed object containing the property.
     */
    private final int offset;

    /** The name of the property containing the inherited default values. */
    private final String propertyName;

    /**
     * Create a relative inherited default behavior provider associated with a
     * parent managed object.
     *
     * @param d
     *            The type of parent managed object expected at the relative
     *            location.
     * @param propertyName
     *            The name of the property containing the inherited default
     *            values.
     * @param offset
     *            The relative location of the parent managed object (where 0 is
     *            the managed object itself, 1 is the parent, and 2 is the
     *            grand-parent).
     * @throws IllegalArgumentException
     *             If the offset is less than 0.
     */
    public RelativeInheritedDefaultBehaviorProvider(AbstractManagedObjectDefinition<?, ?> d, String propertyName,
        int offset) {
        // We do not decode the property name now because the property
        // might not have been constructed at this point (e.g. when the
        // offset is 0).
        if (offset < 0) {
            throw new IllegalArgumentException("Negative offset");
        }
        this.d = d;
        this.propertyName = propertyName;
        this.offset = offset;
    }

    /** {@inheritDoc} */
    public <R, P> R accept(DefaultBehaviorProviderVisitor<T, R, P> v, P p) {
        return v.visitRelativeInherited(this, p);
    }

    /**
     * Get the definition of the parent managed object containing the inherited
     * default values.
     *
     * @return Returns the definition of the parent managed object containing
     *         the inherited default values.
     */
    public AbstractManagedObjectDefinition<?, ?> getManagedObjectDefinition() {
        return d;
    }

    /**
     * Get the absolute path of the managed object containing the property which
     * has the default values.
     *
     * @param path
     *            The path of the current managed object from which the relative
     *            path should be determined.
     * @return Returns the absolute path of the managed object containing the
     *         property which has the default values.
     */
    public ManagedObjectPath<?, ?> getManagedObjectPath(ManagedObjectPath<?, ?> path) {
        return path.parent(offset);
    }

    /**
     * Gets the name of the property containing the inherited default values.
     *
     * @return Returns the name of the property containing the inherited default
     *         values.
     */
    public String getPropertyName() {
        return propertyName;
    }

    /**
     * Get the relative location of the parent managed object.
     *
     * @return Returns the relative location of the parent managed object (where
     *         0 is the managed object itself, 1 is the parent, and 2 is the
     *         grand-parent).
     */
    public int getRelativeOffset() {
        return offset;
    }
}
