/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.util;
/**
* A class that caches commonly used Integer-objects. This reduces the number of objects created when processing the
* report. JDK 1.5 provides a similiar facility, but this cheap functionality is not worth upgrading to that JDK.
*
* @author Thomas Morgner
*/
public class IntegerCache {
/**
* A cache holding the first 1000 integers.
*/
private static Integer[] cachedNumbers;
static {
cachedNumbers = new Integer[1000];
for ( int i = 0; i < cachedNumbers.length; i++ ) {
cachedNumbers[i] = new Integer( i );
}
}
/**
* Default constructor.
*/
private IntegerCache() {
}
/**
* Returns the integer-object for the given primitive integer.
*
* @param i
* the primitive integer value.
* @return the constructed integer object.
*/
public static Integer getInteger( final int i ) {
if ( i < 0 ) {
return new Integer( i );
}
if ( i > 999 ) {
return new Integer( i );
}
return cachedNumbers[i];
}
}