/*
* Copyright 2004 the original author or authors.
*
* 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 com.ancientprogramming.fixedformat4j.format.impl;
import com.ancientprogramming.fixedformat4j.exception.FixedFormatException;
import com.ancientprogramming.fixedformat4j.format.FixedFormatter;
import com.ancientprogramming.fixedformat4j.format.FormatContext;
import com.ancientprogramming.fixedformat4j.format.FormatInstructions;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* Formatter capable of formatting a bunch of known java standard library classes. So far:
* {@link String}, {@link Integer}, {@link Long}, {@link Date},
* {@link Character}, {@link Boolean}, {@link Double}, {@link Float} and {@link BigDecimal}
*
*
* @author Jacob von Eyben www.ancientprogramming.com
* @since 1.0.0
*/
public class ByTypeFormatter implements FixedFormatter {
private FormatContext context;
private static final Map<Class<? extends Serializable>, Class<? extends FixedFormatter>> KNOWN_FORMATTERS = new HashMap<Class<? extends Serializable>, Class<? extends FixedFormatter>>();
static {
KNOWN_FORMATTERS.put(String.class, StringFormatter.class);
KNOWN_FORMATTERS.put(Integer.class, IntegerFormatter.class);
KNOWN_FORMATTERS.put(Long.class, LongFormatter.class);
KNOWN_FORMATTERS.put(Date.class, DateFormatter.class);
KNOWN_FORMATTERS.put(Character.class, CharacterFormatter.class);
KNOWN_FORMATTERS.put(Boolean.class, BooleanFormatter.class);
KNOWN_FORMATTERS.put(Double.class, DoubleFormatter.class);
KNOWN_FORMATTERS.put(Float.class, FloatFormatter.class);
KNOWN_FORMATTERS.put(BigDecimal.class, BigDecimalFormatter.class);
}
public ByTypeFormatter(FormatContext context) {
this.context = context;
}
public Object parse(String value, FormatInstructions instructions) {
FixedFormatter formatter = actualFormatter(context.getDataType());
return formatter.parse(value, instructions);
}
public String format(Object value, FormatInstructions instructions) {
FixedFormatter formatter = actualFormatter(context.getDataType());
return formatter.format(value, instructions);
}
public FixedFormatter actualFormatter(final Class<? extends Object> dataType) {
Class<? extends FixedFormatter> formatterClass = KNOWN_FORMATTERS.get(dataType);
if (formatterClass != null) {
try {
return formatterClass.getConstructor().newInstance();
} catch (NoSuchMethodException e) {
throw new FixedFormatException("Could not create instance of[" + formatterClass.getName() + "] because no default constructor exists");
} catch (Exception e) {
throw new FixedFormatException("Could not create instance of[" + formatterClass.getName() + "]", e);
}
} else {
throw new FixedFormatException(ByTypeFormatter.class.getName() + " cannot handle datatype[" + dataType.getName() + "]. Provide your own custom FixedFormatter for this datatype.");
}
}
}