/*
 * Copyright 2010 JBoss Inc
 *
 * Licensed 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.drools.core.util;

import java.math.BigDecimal;
import java.math.BigInteger;

/**
 * Utility methods for math classes
 */
public class MathUtils {
    
    public static BigDecimal getBigDecimal( Object value ) {
        BigDecimal ret = null;
        if( value != null ) {
            if( value instanceof BigDecimal ) {
                ret = (BigDecimal) value;
            } else if( value instanceof String ) {
                ret = new BigDecimal( (String) value );
            } else if( value instanceof BigInteger ) {
                ret = new BigDecimal( (BigInteger) value );
            } else if( value instanceof Number ) {
                ret = new BigDecimal( ((Number)value).doubleValue() );
            } else {
                throw new ClassCastException("Not possible to coerce ["+value+"] from class "+value.getClass()+" into a BigDecimal.");
            }
        }
        return ret;
    }

    public static BigInteger getBigInteger(Object value) {
        BigInteger ret = null;
        if ( value != null ) {
            if ( value instanceof BigInteger ) {
                ret = (BigInteger) value;
            } else if ( value instanceof String ) {
                ret = new BigInteger( (String) value );
            } else if ( value instanceof BigDecimal ) {
                ret = ((BigDecimal) value).toBigInteger();
            } else if ( value instanceof Number ) {
                ret = BigInteger.valueOf( ((Number) value).longValue() );
            } else {
                throw new ClassCastException( "Not possible to coerce [" + value + "] from class " + value.getClass() + " into a BigInteger." );
            }
        }
        return ret;
    }

}
