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/* Copyright (c) 2014, Effektif GmbH.
*
* 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.effektif.workflow.api.model;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import com.effektif.workflow.api.json.GenericType;
/**
* @author Tom Baeyens
*/
public class ValueConverter {
static Map> converters = new LinkedHashMap<>();
public interface Converter {
TARGET convert(SOURCE o);
}
static {
addConverter(Number.class, new Converter() {
public Integer convert(Number number) {
return number.intValue();
}
}, Integer.class, int.class);
addConverter(Number.class, new Converter() {
public Long convert(Number number) {
return number.longValue();
}
}, Long.class, long.class);
addConverter(Number.class, new Converter() {
public Double convert(Number number) {
return number.doubleValue();
}
}, Double.class, double.class);
addConverter(Number.class, new Converter() {
public Float convert(Number number) {
return number.floatValue();
}
}, Float.class, float.class);
addConverter(Number.class, new Converter() {
public Short convert(Number number) {
return number.shortValue();
}
}, Short.class, short.class);
addConverter(Number.class, new Converter() {
public Byte convert(Number number) {
return number.byteValue();
}
}, Byte.class, byte.class);
}
public static void addConverter(Class sourceClass, Converter converter, Class... targetClasses) {
Map sourceConverters = converters.get(sourceClass);
if (sourceConverters==null) {
sourceConverters = new HashMap<>();
converters.put(sourceClass, sourceConverters);
}
for (Class clazz: targetClasses) {
sourceConverters.put(clazz, converter);
}
}
public static T shoehorn(S foot, Class shoe) {
if (foot==null) {
return null;
}
if (foot.getClass()==shoe) {
return (T) foot;
}
Converter converter = (Converter) findConverter(foot.getClass(), shoe);
return converter.convert(foot);
}
public static T shoehorn(S foot, Type shoe) {
if (shoe instanceof Class) {
return shoehorn(foot, (Class)shoe);
}
if (shoe instanceof GenericType) {
GenericType genericType = (GenericType) shoe;
if (genericType.getRawClass().isAssignableFrom(ArrayList.class)
&& foot instanceof Collection) {
return (T) shoehorn((Collection)foot, (Class)genericType.getTypeArgs()[0]);
}
}
throw new RuntimeException("don't know how to shoehorn "+foot+" into "+shoe);
}
public static List shoehorn(Collection feet, Class shoe) {
if (feet==null) {
return null;
}
ArrayList shoehornedFeet = new ArrayList<>();
for (S foot: feet) {
shoehornedFeet.add(shoehorn(foot, shoe));
}
return shoehornedFeet;
}
public static Converter findConverter(Class sourceClass, Class targetClass) {
for (Class candidateSourceClass: converters.keySet()) {
if (candidateSourceClass==sourceClass) {
Converter converter = converters.get(candidateSourceClass).get(targetClass);
if (converter!=null) {
return converter;
}
}
}
Class superclass = sourceClass.getSuperclass();
if (superclass!=null) {
return findConverter(superclass, targetClass);
}
return null;
}
}
