converterutils.java

一个使用struts+hibernate+spring开发的完的网站源代码。

/*
 * Copyright 2004 The Apache Software Foundation.
 * 
 * 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.apache.myfaces.convert;


/**
 * TODO: Move to util package and rename to better name
 *
 * @author Manfred Geiler (latest modification by $Author: matze $)
 * @version $Revision: 1.52 $ $Date: 2004/10/13 11:51:00 $
 */
public final class ConverterUtils
{
    //private static final Log log = LogFactory.getLog(ConverterUtils.class);

    private ConverterUtils() {}


	public static int convertToInt(Object value)
	{
		if (value instanceof Number)
		{
			return ((Number)value).intValue();
		}
		else if (value instanceof String)
		{
			try
			{
				return Integer.parseInt((String)value);
			}
			catch (NumberFormatException e)
			{
				throw new IllegalArgumentException("Cannot convert " + value.toString() + " to int");
			}
		}
		else
		{
			throw new IllegalArgumentException("Cannot convert " + value.toString() + " to int");
		}
	}

	public static boolean convertToBoolean(Object value)
	{
		if (value instanceof Boolean)
		{
			return ((Boolean)value).booleanValue();
		}
		else if (value instanceof String)
		{
			try
			{
				return new Boolean((String)value).booleanValue();
			}
			catch (Exception e)
			{
				throw new IllegalArgumentException("Cannot convert " + value.toString() + " to boolean");
			}
		}
		else
		{
			throw new IllegalArgumentException("Cannot convert " + value.toString() + " to int");
		}
	}	

    public static long convertToLong(Object value)
    {
        if (value instanceof Number)
        {
            return ((Number)value).longValue();
        }
        else if (value instanceof String)
        {
            try
            {
                return Long.parseLong((String)value);
            }
            catch (NumberFormatException e)
            {
                throw new IllegalArgumentException("Cannot convert " + value.toString() + " to long");
            }
        }
        else
        {
            throw new IllegalArgumentException("Cannot convert " + value.toString() + " to long");
        }
    }

    public static double convertToDouble(Object value)
    {
        if (value instanceof Number)
        {
            return ((Number)value).doubleValue();
        }
        else if (value instanceof String)
        {
            try
            {
                return Double.parseDouble((String)value);
            }
            catch (NumberFormatException e)
            {
                throw new IllegalArgumentException("Cannot convert " + value.toString() + " to double");
            }
        }
        else
        {
            throw new IllegalArgumentException("Cannot convert " + value.toString() + " to double");
        }
    }


}