/*
 * Copyright 2012-2014 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */


package com.redhat.thermostat.storage.core;

import com.redhat.thermostat.storage.model.Pojo;
import com.redhat.thermostat.storage.query.Expression;

/**
 * Write operation which should be used if any existing record should get
 * updated with new values. It can be thought of as {@link Update} for
 * <strong>all</strong> properties of a record.
 * <p>
 * The only distinction to a regular {@link Update} is that if Replace is used
 * and the associated {@code where} expression yields no result, a
 * <strong>new</strong> record will be insterted into Storage.
 * <p>
 * The result of this operation is undefined if the {@code where} expression
 * matches more than one record in storage.
 *
 * @see Add
 * @see Remove
 * @see Update
 */
public interface Replace<T extends Pojo> extends DataModifyingStatement<T> {

    /**
     * Sets a field in a found record to the specified value. If the same key is
     * set more than once, the latest value overrides the former value for that
     * key.
     * 
     * @param key
     *            the name of the field to update.
     * @param value
     *            the value with which to update the field.
     */
    void set(String key, Object value);

    /**
     * Specifies what criteria to use to find the record to replace
     */
    void where(Expression expression);

    /**
     * Applies this {@code Replace} operation to the storage.
     *
     * @throws StorageException If the operation fails
     */
    int apply();

}

