/*
* Copyright 2012 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.manning.siia.kitchen.domain;
import com.manning.siia.kitchen.domain.Amount;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import static com.manning.siia.kitchen.domain.Amount.Unit;
/**
* @author Iwein Fuld
*/
public class AmountConverter implements Converter {
public void marshal(final Object source, final HierarchicalStreamWriter writer, final MarshallingContext context) {
Amount amount = (Amount) source;
StringBuilder builder = new StringBuilder();
builder.append(amount.getAmount());
if (amount.getUnit() == Unit.GRAMS) {
builder.append(" gr");
}
writer.setValue(builder.toString());
}
public Object unmarshal(final HierarchicalStreamReader reader, final UnmarshallingContext context) {
final String value = reader.getValue();
final String[] strings = value.split(" ");
if (strings.length == 1) {
return new Amount(Integer.parseInt(strings[0]), Unit.PIECES);
} else if (strings[1].trim().equalsIgnoreCase("gr")) {
return new Amount(Integer.parseInt(strings[0]), Unit.GRAMS);
} else {
throw new IllegalArgumentException("Could not parse Amount: " + value);
}
}
public boolean canConvert(final Class type) {
return type.equals(Amount.class);
}
}