jodd.typeconverter.impl.FloatConverter Maven / Gradle / Ivy

// Copyright (c) 2003-2014, Jodd Team (jodd.org). All Rights Reserved.

package jodd.typeconverter.impl;

import jodd.typeconverter.TypeConversionException;
import jodd.typeconverter.TypeConverter;
import jodd.util.StringUtil;

/**
 * Converts given object to Float.
 * Conversion rules:
 * 
 * null value is returned as null
 * object of destination type is simply casted
 * object is converted to string, trimmed, and then converted if possible.
 * 
 * Number string may start with plus and minus sign.
 */
public class FloatConverter implements TypeConverter {

	public Float convert(Object value) {
		if (value == null) {
			return null;
		}

		if (value.getClass() == Float.class) {
			return (Float) value;
		}
		if (value instanceof Number) {
			return Float.valueOf(((Number)value).floatValue());
		}
		if (value instanceof Boolean) {
			return ((Boolean) value).booleanValue() ? Float.valueOf(1) : Float.valueOf(0);
		}

		try {
			String stringValue = value.toString().trim();
			if (StringUtil.startsWithChar(stringValue, '+')) {
				stringValue = stringValue.substring(1);
			}
			return Float.valueOf(stringValue);
		} catch (NumberFormatException nfex) {
			throw new TypeConversionException(value, nfex);
		}
	}

}