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StringConverters.java
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StringConverters.java
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/*
* Copyright 2013 Gordon Burgett and individual contributors
*
* 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.xflatdb.xflat.convert.converters;
import java.text.ParseException;
import java.util.Date;
import org.xflatdb.xflat.convert.ConversionException;
import org.xflatdb.xflat.convert.ConversionService;
import org.xflatdb.xflat.convert.Converter;
/**
* Contains a number of converters to and from strings
* @author gordon
*/
public class StringConverters {
/**
* Registers all the string converters to the given ConversionService.
* @param service
*/
public static void registerTo(ConversionService service){
service.addConverter(String.class, Integer.class, StringToIntegerConverter);
service.addConverter(String.class, Boolean.class, StringToBooleanConverter);
service.addConverter(String.class, Double.class, StringToDoubleConverter);
service.addConverter(String.class, Float.class, StringToFloatConverter);
service.addConverter(String.class, Long.class, StringToLongConverter);
service.addConverter(String.class, Date.class, StringToDateConverter);
service.addConverter(Integer.class, String.class, ObjectToStringConverter);
service.addConverter(Boolean.class, String.class, ObjectToStringConverter);
service.addConverter(Double.class, String.class, ObjectToStringConverter);
service.addConverter(Float.class, String.class, ObjectToStringConverter);
service.addConverter(Long.class, String.class, ObjectToStringConverter);
service.addConverter(null, String.class, ObjectToStringConverter);
service.addConverter(Date.class, String.class, DateToStringConverter);
}
public static final Converter<String, Integer> StringToIntegerConverter = new Converter<String, Integer>(){
@Override
public Integer convert(String source) throws ConversionException {
try{
return Integer.valueOf(source);
}catch(NumberFormatException ex){
throw new ConversionException("Error parsing Integer", ex);
}
}
};
public static final Converter<String, Boolean> StringToBooleanConverter = new Converter<String, Boolean>(){
@Override
public Boolean convert(String source) {
return Boolean.valueOf(source);
}
};
public static final Converter<String, Long> StringToLongConverter = new Converter<String, Long>() {
@Override
public Long convert(String source) throws ConversionException {
//is it all numbers? Longs can also represent dates.
for(int i = 0; i < source.length(); i++){
if(!Character.isDigit(source.codePointAt(i))){
//it's a date format string or nothing
try{
return format.get().parse(source).getTime();
}catch(ParseException ex){
//could also be represented as a long
throw new ConversionException("error parsing date", ex);
}
}
}
try{
return Long.valueOf(source);
}catch(NumberFormatException ex){
throw new ConversionException("Error parsing Long", ex);
}
}
};
public static final Converter<String, Float> StringToFloatConverter = new Converter<String, Float>(){
@Override
public Float convert(String source) throws ConversionException {
try{
return Float.valueOf(source);
}catch(NumberFormatException ex){
throw new ConversionException("Error parsing float", ex);
}
}
};
public static final Converter<String, Double> StringToDoubleConverter = new Converter<String, Double>(){
@Override
public Double convert(String source) throws ConversionException {
try{
return Double.valueOf(source);
}catch(NumberFormatException ex){
throw new ConversionException("Error parsing double", ex);
}
}
};
public static final Converter<Object, String> ObjectToStringConverter = new Converter<Object, String>(){
@Override
public String convert(Object source) {
if(source == null)
return null;
return source.toString();
}
};
static final ThreadLocal<java.text.DateFormat> format =
new ThreadLocal<java.text.DateFormat>(){
@Override
public java.text.DateFormat initialValue(){
//SimpleDateFormat is not thread-safe
return new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSX");
}
};
public static final Converter<String, Date> StringToDateConverter = new Converter<String, Date>(){
@Override
public Date convert(String source) throws ConversionException {
//first, is it all digits? Dates can be represented as longs.
for(int i = 0; i < source.length(); i++){
if(!Character.isDigit(source.codePointAt(i))){
//it's a date format string or nothing
try{
return format.get().parse(source);
}catch(ParseException ex){
//could also be represented as a long
throw new ConversionException("error parsing date", ex);
}
}
}
//it's all digits - it's a long or nothing
try{
return new Date(Long.parseLong(source));
}
catch(NumberFormatException ex2){
throw new ConversionException("error parsing date", ex2);
}
}
};
public static final Converter<Date, String> DateToStringConverter = new Converter<Date, String>() {
@Override
public String convert(Date source) {
return format.get().format(source);
}
};
}