    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.io;
    019
    020import java.nio.ByteOrder;
    021
    022/**
    023 * Converts Strings to {@link ByteOrder} instances.
    024 *
    025 * @since 2.6
    026 */
    027public final class ByteOrderParser {
    028
    029    /**
    030     * Parses the String argument as a {@link ByteOrder}.
    031     * <p>
    032     * Returns {@code ByteOrder.LITTLE_ENDIAN} if the given value is {@code "LITTLE_ENDIAN"}.
    033     * </p>
    034     * <p>
    035     * Returns {@code ByteOrder.BIG_ENDIAN} if the given value is {@code "BIG_ENDIAN"}.
    036     * </p>
    037     * Examples:
    038     * <ul>
    039     * <li>{@code ByteOrderParser.parseByteOrder("LITTLE_ENDIAN")} returns {@code ByteOrder.LITTLE_ENDIAN}</li>
    040     * <li>{@code ByteOrderParser.parseByteOrder("BIG_ENDIAN")} returns {@code ByteOrder.BIG_ENDIAN}</li>
    041     * </ul>
    042     *
    043     * @param value
    044     *            the {@link String} containing the ByteOrder representation to be parsed
    045     * @return the ByteOrder represented by the string argument
    046     * @throws IllegalArgumentException
    047     *             if the {@link String} containing the ByteOrder representation to be parsed is unknown.
    048     */
    049    public static ByteOrder parseByteOrder(final String value) {
    050        if (ByteOrder.BIG_ENDIAN.toString().equals(value)) {
    051            return ByteOrder.BIG_ENDIAN;
    052        }
    053        if (ByteOrder.LITTLE_ENDIAN.toString().equals(value)) {
    054            return ByteOrder.LITTLE_ENDIAN;
    055        }
    056        throw new IllegalArgumentException("Unsupported byte order setting: " + value + ", expected one of " + ByteOrder.LITTLE_ENDIAN +
    057                 ", " + ByteOrder.BIG_ENDIAN);
    058    }
    059
    060    /**
    061     * ByteOrderUtils is a static utility class, so prevent construction with a private constructor.
    062     */
    063    private ByteOrderParser() {
    064    }
    065
    066}