Java Reflection Primitive getRank(Class aNumberClass)

Description

Gets the ordinal type rank of the given Number Class.

License

Open Source License

Parameter

Parameter	Description
aNumberClass	a Class derived from Number, or Number.class itself.

Return

the rank of the Number type. Zero is the lowest rank, positive numbers indicate higher rank.

Declaration

public static int getRank(Class aNumberClass) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2000, 2006 Visual Systems Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License version 2
 * which accompanies this distribution in a file named "COPYING".
 * /*  w w w.  ja  v a 2 s  .  co m*/
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *      
 * 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 General Public License for more details.
 *      
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *******************************************************************************/

import java.util.HashMap;

import java.util.Map;

public class Main {
    /** Key is a Number Class, Value is an Integer indicating rank. */
    private static final Map<Class<?>, Integer> NUMBER_RANK_MAP = new HashMap<Class<?>, Integer>();

    /**
     * Gets the ordinal type rank of the given Number Class. The rank can be used to determine type promotion.
     * The following Number types are supported:
     * BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, Short, Number. Number is supported as an
     * abstract type. It has the highest rank.
     * 
     * @param aNumberClass a Class derived from Number, or Number.class itself.  
     * 
     * @return the rank of the Number type. Zero is the lowest rank, positive numbers indicate
     *  higher rank. 
     */
    public static int getRank(Class aNumberClass) {
        Integer rank = (Integer) NUMBER_RANK_MAP.get(aNumberClass);
        assert rank != null;
        return rank.intValue();
    }
}

Related

1. getPrimitivePromotionCost(final Class srcClass, final Class destClass)
2. getPrimitiveSize(Class type)
3. getPrimitiveType(Class clazz)
4. getPrimitiveType(String javaClassName)
5. getPrimitiveWrapper(Class primitiveType)
6. getWrapper(Class clazz)
7. getWrapper(Class type)
8. getWrapper(final Class beanClass)
9. getWrapperClass(Class clazz)