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 [EMAIL PROTECTED]
*
* 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;
}
}
