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/*-
 * Copyright (C) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * This file was distributed by Oracle as part of a version of Oracle Berkeley
 * DB Java Edition made available at:
 *
 * http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html
 *
 * Please see the LICENSE file included in the top-level directory of the
 * appropriate version of Oracle Berkeley DB Java Edition for a copy of the
 * license and additional information.
 */

package com.sleepycat.je.utilint;

import com.sleepycat.je.DatabaseEntry;

/**
 * Utils for use in the db package.
 */
public class DatabaseUtil {

    /*
     * The global JE test mode flag.  When true, certain instrumentation is
     * turned on.  This flag is always true during unit testing.
     */
    public static final boolean TEST = Boolean.getBoolean("JE_TEST");

    /**
     * Throw an exception if the parameter is null.
     *
     * @throws IllegalArgumentException via any API method
     */
    public static void checkForNullParam(final Object param,
                                         final String name) {
        if (param == null) {
            throw new IllegalArgumentException(name + " cannot be null");
        }
    }

    /**
     * Throw an exception if the parameter is a null or 0-length array.
     *
     * @throws IllegalArgumentException via any API method
     */
    public static void checkForZeroLengthArrayParam(final Object[] param,
                                                    final String name) {
        checkForNullParam(param, name);

        if (param.length == 0) {
            throw new IllegalArgumentException(
                "'" + name + "' param cannot be zero length");
        }
    }

    /**
     * Throw an exception if the entry is null or the data field is not set.
     *
     * @throws IllegalArgumentException via any API method that takes a
     * required DatabaseEntry param
     */
    public static void checkForNullDbt(final DatabaseEntry entry,
                                       final String name,
                                       final boolean checkData) {
        if (entry == null) {
            throw new IllegalArgumentException(
                "'" + name + "' param cannot be null");
        }

        if (checkData) {
            if (entry.getData() == null) {
                throw new IllegalArgumentException(
                    "Data field for '" + name + "' param cannot be null");
            }
        }
    }

    /**
     * Throw an exception if the entry has the partial flag set.
     */
    public static void checkForPartial(final DatabaseEntry entry,
                                       final String name) {
        if (entry.getPartial()) {
            throw new IllegalArgumentException(
                "'" + name + "' param may not be partial");
        }
    }
}