/*
 * Copyright 2010 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Portions copyright 2006-2009 James Murty. Please see LICENSE.txt
 * for applicable license terms and NOTICE.txt for applicable notices.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.amazonaws.services.s3.model;

/**
 * Specifies a grant, consisting of one grantee and one permission.
 * 
 * @see Grant#Grant(Grantee, Permission)
 */
public class Grant {
    private Grantee grantee = null;
    private Permission permission = null;

    /**
     * Constructs a new {@link Grant} object using the specified grantee and permission
     * objects.
     *
     * @param grantee
     *            The grantee being granted a permission by this grant.
     * @param permission
     *            The permission being granted to the grantee by this grant.
     */
    public Grant(Grantee grantee, Permission permission) {
        this.grantee = grantee;
        this.permission = permission;
    }

    /**
     * Gets the grantee being granted a permission by this grant.
     *
     * @return The grantee being granted a permission by this grant.
     * 
     * @see Grant#getPermission()
     */
    public Grantee getGrantee() {
        return grantee;
    }

    /**
     * Gets the permission being granted to the grantee by this grant.
     *
     * @return The permission being granted to the grantee by this grant.
     * 
     * @see Grant#getGrantee()
     */
    public Permission getPermission() {
        return permission;
    }

    public int hashCode() {
        return (grantee + ":" + permission.toString()).hashCode();
    }

    public boolean equals(Object obj) {
        return (obj instanceof Grant
            && this.getGrantee().getIdentifier().equals(((Grant)obj).getGrantee().getIdentifier())
            && this.getPermission().equals(((Grant)obj).getPermission())
            );
    }

}