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From jdil...@apache.org
Subject cvs commit: incubator-geronimo/modules/common/src/java/org/apache/geronimo/common Primitives.java
Date Sun, 24 Aug 2003 20:55:07 GMT
jdillon     2003/08/24 13:55:07

  Added:       modules/common/src/java/org/apache/geronimo/common
                        Primitives.java
  Log:
   o Required by mutable wrappers
  
  Revision  Changes    Path
  1.1                  incubator-geronimo/modules/common/src/java/org/apache/geronimo/common/Primitives.java
  
  Index: Primitives.java
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache Geronimo" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache Geronimo", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * ====================================================================
   */
  
  package org.apache.geronimo.common;
  
  /**
   * Primitive utilities.
   *
   * @version $Revision: 1.1 $ $Date: 2003/08/24 20:55:07 $
   */
  public final class Primitives
  {
      /**
       * Test the equality of two doubles by converting their values into
       * IEEE 754 floating-point "double format" long values.
       *
       * @param a    Double to check equality with.
       * @param b    Double to check equality with.
       * @return     True if a equals b.
       */
      public static boolean equals(final double a, final double b) {
          return Double.doubleToLongBits(a) == Double.doubleToLongBits(b);
      }
      
      /**
       * Test the equality of two doubles by converting their values into
       * IEEE 754 floating-point "single precision" bit layouts.
       *
       * @param a    Float to check equality with.
       * @param b    Float to check equality with.
       * @return     True if a equals b.
       */
      public static boolean equals(final float a, final float b) {
          return Float.floatToIntBits(a) == Float.floatToIntBits(b);
      }
      
      /**
       * Test the equality of a given sub-section of two byte arrays.
       *
       * @param a       The first byte array.
       * @param abegin  The begining index of the first byte array.
       * @param b       The second byte array.
       * @param bbegin  The begining index of the second byte array.
       * @param length  The length of the sub-section.
       * @return        True if sub-sections are equal.
       */
      public static boolean equals(final byte a[], final int abegin,
                                   final byte b[], final int bbegin,
                                   final int length)
      {
          try {
              int i=length;
              while (--i >= 0) {
                  if (a[abegin + i] != b[bbegin + i]) {
                      return false;
                  }
              }
          }
          catch (ArrayIndexOutOfBoundsException e) {
              return false;
          }
          
          return true;
      }
      
      /**
       * Test the equality of two byte arrays.
       *
       * @param a    The first byte array.
       * @param b    The second byte array.
       * @return     True if the byte arrays are equal.
       */
      public static boolean equals(final byte a[], final byte b[]) {
          if (a == b) return true;
          if (a == null || b == null) return false;
          if (a.length != b.length) return false;
          
          try {
              for (int i=0; i<a.length; i++) {
                  if (a[i] != b[i]) {
                      return false;
                  }
              }
          }
          catch (ArrayIndexOutOfBoundsException e) {
              return false;
          }
          
          return true;
      }
      
      /**
       * Safely convert a <tt>long</tt> into a <tt>int</tt> value.
       *
       * <p>If value is > Integer.MAX_VALUE or < Integer.MIN_VALUE
       *    then an exception will be thrown, else the value is cast
       *    down to an <tt>int</tt>.
       *
       * @param value   The <tt>long</tt> value to convert.
       * @return        The converted value.
       *
       * @throws DataConversionException  Could not safely convert the value.
       */
      public static int toInt(final long value)
          throws DataConversionException
      {
          if (value > Integer.MAX_VALUE || value < Integer.MIN_VALUE) {
              throw new DataConversionException
                  ("can not safly convert to int: " + value);
          }
          
          return (int)value;
      }
  }
  
  
  

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