com.twelvemonkeys.util.convert.ConverterImpl Maven / Gradle / Ivy
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/*
* Copyright (c) 2008, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name "TwelveMonkeys" nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.twelvemonkeys.util.convert;
/**
* The converter (singleton). Converts strings to objects and back.
* This is the entrypoint to the converter framework.
*
* @see #registerConverter(Class, PropertyConverter)
*
* @author Harald Kuhr
* @author last modified by $Author: haku $
* @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/util/convert/ConverterImpl.java#1 $
*/
class ConverterImpl extends Converter {
/**
* Creates a Converter.
*/
ConverterImpl() {
}
/**
* Gets the registered converter for the given type.
*
* @param pType the type to convert to
* @return an instance of a {@code PropertyConverter} or {@code null}
*/
private PropertyConverter getConverterForType(Class pType) {
Object converter;
Class cl = pType;
// Loop until we find a suitable converter
do {
// Have a match, return converter
if ((converter = getInstance().mConverters.get(cl)) != null) {
return (PropertyConverter) converter;
}
}
while ((cl = cl.getSuperclass()) != null);
// No converter found, return null
return null;
}
/**
* Converts the string to an object of the given type, parsing after the
* given format.
*
* @param pString the string to convert
* @param pType the type to convert to
* @param pFormat the vonversion format
*
* @return the object created from the given string.
*
* @throws ConversionException if the string cannot be converted for any
* reason.
*/
public Object toObject(String pString, Class pType, String pFormat)
throws ConversionException {
if (pString == null) {
return null;
}
if (pType == null) {
throw new MissingTypeException();
}
// Get converter
PropertyConverter converter = getConverterForType(pType);
if (converter == null) {
throw new NoAvailableConverterException("Cannot convert to object, no converter available for type \"" + pType.getName() + "\"");
}
// Convert and return
return converter.toObject(pString, pType, pFormat);
}
/**
* Converts the object to a string, using {@code object.toString()}
*
* @param pBean the object to convert
* @param pFormat the conversion format
*
* @return the string representation of the object, on the correct format.
*
* @throws ConversionException if the object cannot be converted to a
* string for any reason.
*/
public String toString(Object pBean, String pFormat)
throws ConversionException {
if (pBean == null) {
return null;
}
// Get converter
PropertyConverter converter = getConverterForType(pBean.getClass());
if (converter == null) {
throw new NoAvailableConverterException("Cannot object to string, no converter available for type \"" + pBean.getClass().getName() + "\"");
}
// Convert and return string
return converter.toString(pBean, pFormat);
}
}