content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.activemq.util;
  
  import java.io.IOException;
  import java.math.BigInteger;
  
  import org.apache.activemq.MaxFrameSizeExceededException;
  
  public final class IOExceptionSupport {
  
      private IOExceptionSupport() {
      }
  
      public static IOException create(String msg, Throwable cause) {
          IOException exception = new IOException(msg);
          exception.initCause(cause);
          return exception;
      }
  
      public static IOException create(String msg, Exception cause) {
          IOException exception = new IOException(msg);
          exception.initCause(cause);
          return exception;
      }
  
      public static IOException create(Throwable cause) {
          IOException exception = new IOException(cause.getMessage());
          exception.initCause(cause);
          return exception;
      }
  
      public static IOException create(Exception cause) {
          IOException exception = new IOException(cause.getMessage());
          exception.initCause(cause);
          return exception;
      }
  
      public static IOException createFrameSizeException(int size, long maxSize) {
          return new MaxFrameSizeExceededException("Frame size of " + toHumanReadableSizeString(size) +
              " is larger than max allowed " + toHumanReadableSizeString(maxSize));
      }
  
      public static IOException createFrameSizeBufferException(int bufferSize, long frameSize) {
          return new IOException("Estimated allocated buffer size of "
            + toHumanReadableSizeString(bufferSize) + " is larger than frame size of "
            + toHumanReadableSizeString(frameSize));
      }
  
      private static String toHumanReadableSizeString(final int size) {
          return toHumanReadableSizeString(BigInteger.valueOf(size));
      }
  
      private static String toHumanReadableSizeString(final long size) {
          return toHumanReadableSizeString(BigInteger.valueOf(size));
      }
  
      private static String toHumanReadableSizeString(final BigInteger size) {
          String displaySize;
  
          final BigInteger ONE_KB_BI = BigInteger.valueOf(1024);
          final BigInteger ONE_MB_BI = ONE_KB_BI.multiply(ONE_KB_BI);
          final BigInteger ONE_GB_BI = ONE_KB_BI.multiply(ONE_MB_BI);
  
          if (size.divide(ONE_GB_BI).compareTo(BigInteger.ZERO) > 0) {
              displaySize = String.valueOf(size.divide(ONE_GB_BI)) + " GB";
          } else if (size.divide(ONE_MB_BI).compareTo(BigInteger.ZERO) > 0) {
              displaySize = String.valueOf(size.divide(ONE_MB_BI)) + " MB";
          } else if (size.divide(ONE_KB_BI).compareTo(BigInteger.ZERO) > 0) {
              displaySize = String.valueOf(size.divide(ONE_KB_BI)) + " KB";
          } else {
              displaySize = String.valueOf(size) + " bytes";
          }
  
          return displaySize;
      }
  }
  