/*
 * #%L
 * BroadleafCommerce CMS Module
 * %%
 * Copyright (C) 2009 - 2013 Broadleaf Commerce
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *       http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License 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.
 * #L%
 */
package org.broadleafcommerce.cms.page.domain;

import org.broadleafcommerce.common.copy.MultiTenantCloneable;
import org.broadleafcommerce.common.rule.SimpleRule;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * Implementations hold the values for a rule used to determine if a <code>Page</code>
 * should be displayed.
 * <br>
 * The rule is represented as a valid MVEL string.    The Content Management System by default
 * is able to process rules based on the current customer, product,
 * {@link org.broadleafcommerce.common.TimeDTO time}, or {@link org.broadleafcommerce.common.RequestDTO request}
 *
 * @see org.broadleafcommerce.cms.web.structure.DisplayContentTag
 * @see org.broadleafcommerce.cms.structure.service.PageServiceImpl#evaluateAndPriortizePages(java.util.List, int, java.util.Map)
 * @author bpolster
 *
 */
public interface PageRule extends SimpleRule,MultiTenantCloneable<PageRule> {

    /**
     * Gets the primary key.
     *
     * @return the primary key
     */
    @Nullable
    public Long getId();

    /**
     * Sets the primary key.
     *
     * @param id the new primary key
     */
    public void setId(@Nullable Long id);

    /**
     * Builds a copy of this content rule.   Used by the content management system when an
     * item is edited.
     *
     * @return a copy of this rule
     */
    @Nonnull
    public PageRule cloneEntity();

}