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 */
017package org.apache.activemq.util;
018
019import java.io.File;
020import java.util.regex.Matcher;
021import java.util.regex.Pattern;
022
023/**
024 * Converts string values like "20 Mb", "1024kb", and "1g" to long or int values in bytes.
025 */
026public final class XBeanByteConverterUtil {
027
028    private static final Pattern[] BYTE_MATCHERS = new Pattern[] {
029            Pattern.compile("^\\s*(\\d+)\\s*(b)?\\s*$", Pattern.CASE_INSENSITIVE),
030            Pattern.compile("^\\s*(\\d+)\\s*k(b)?\\s*$", Pattern.CASE_INSENSITIVE),
031            Pattern.compile("^\\s*(\\d+)\\s*m(b)?\\s*$", Pattern.CASE_INSENSITIVE),
032            Pattern.compile("^\\s*(\\d+)\\s*g(b)?\\s*$", Pattern.CASE_INSENSITIVE)};
033
034    private XBeanByteConverterUtil() {
035        // complete
036    }
037
038    public static Long convertToLongBytes(String str) throws IllegalArgumentException {
039        for (int i = 0; i < BYTE_MATCHERS.length; i++) {
040            Matcher matcher = BYTE_MATCHERS[i].matcher(str);
041            if (matcher.matches()) {
042                long value = Long.parseLong(matcher.group(1));
043                for (int j = 1; j <= i; j++) {
044                    value *= 1024;
045                }
046                return Long.valueOf(value);
047            }
048        }
049        throw new IllegalArgumentException("Could not convert to a memory size: " + str);
050    }
051
052    public static Integer convertToIntegerBytes(String str) throws IllegalArgumentException {
053        for (int i = 0; i < BYTE_MATCHERS.length; i++) {
054            Matcher matcher = BYTE_MATCHERS[i].matcher(str);
055            if (matcher.matches()) {
056                int value = Integer.parseInt(matcher.group(1));
057                for (int j = 1; j <= i; j++) {
058                    value *= 1024;
059                }
060                return Integer.valueOf(value);
061            }
062        }
063        throw new IllegalArgumentException("Could not convert to a memory size: " + str);
064    }
065    
066}