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.IOException;
020import java.math.BigInteger;
021
022public final class IOExceptionSupport {
023
024    private IOExceptionSupport() {
025    }
026
027    public static IOException create(String msg, Throwable cause) {
028        IOException exception = new IOException(msg);
029        exception.initCause(cause);
030        return exception;
031    }
032
033    public static IOException create(String msg, Exception cause) {
034        IOException exception = new IOException(msg);
035        exception.initCause(cause);
036        return exception;
037    }
038
039    public static IOException create(Throwable cause) {
040        IOException exception = new IOException(cause.getMessage());
041        exception.initCause(cause);
042        return exception;
043    }
044
045    public static IOException create(Exception cause) {
046        IOException exception = new IOException(cause.getMessage());
047        exception.initCause(cause);
048        return exception;
049    }
050
051    public static IOException createFrameSizeException(int size, long maxSize) {
052        return new IOException("Frame size of " + toHumanReadableSizeString(size) +
053            " larger than max allowed " + toHumanReadableSizeString(maxSize));
054    }
055
056    private static String toHumanReadableSizeString(final int size) {
057        return toHumanReadableSizeString(BigInteger.valueOf(size));
058    }
059
060    private static String toHumanReadableSizeString(final long size) {
061        return toHumanReadableSizeString(BigInteger.valueOf(size));
062    }
063
064    private static String toHumanReadableSizeString(final BigInteger size) {
065        String displaySize;
066
067        final BigInteger ONE_KB_BI = BigInteger.valueOf(1024);
068        final BigInteger ONE_MB_BI = ONE_KB_BI.multiply(ONE_KB_BI);
069        final BigInteger ONE_GB_BI = ONE_KB_BI.multiply(ONE_MB_BI);
070
071        if (size.divide(ONE_GB_BI).compareTo(BigInteger.ZERO) > 0) {
072            displaySize = String.valueOf(size.divide(ONE_GB_BI)) + " GB";
073        } else if (size.divide(ONE_MB_BI).compareTo(BigInteger.ZERO) > 0) {
074            displaySize = String.valueOf(size.divide(ONE_MB_BI)) + " MB";
075        } else if (size.divide(ONE_KB_BI).compareTo(BigInteger.ZERO) > 0) {
076            displaySize = String.valueOf(size.divide(ONE_KB_BI)) + " KB";
077        } else {
078            displaySize = String.valueOf(size) + " bytes";
079        }
080
081        return displaySize;
082    }
083}