/*
* Copyright 2002-2013 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 org.springframework.xd.tuple;
import org.springframework.core.convert.converter.Converter;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
/**
* @author David Turanski
*
*/
public class TupleToJsonStringConverter implements Converter<Tuple, String> {
private final ObjectMapper mapper = new ObjectMapper();
@Override
public String convert(Tuple source) {
ObjectNode root = toObjectNode(source);
String json = null;
try {
json = mapper.writeValueAsString(root);
}
catch (Exception e) {
throw new IllegalArgumentException("Tuple to string conversion failed", e);
}
return json;
}
private ObjectNode toObjectNode(Tuple source) {
ObjectNode root = mapper.createObjectNode();
root.put("id", source.getId().toString());
root.put("timestamp", source.getTimestamp());
for (int i = 0; i < source.size(); i++) {
Object value = source.getValues().get(i);
String name = source.getFieldNames().get(i);
if (value != null) {
// System.out.print("parsing " + name + " as ");
if (value instanceof Tuple) {
// System.out.println("tuple");
root.put(name, toObjectNode((Tuple) value));
}
else if (!value.getClass().isPrimitive()) {
// System.out.println("pojo " + value.getClass().getName());
root.put(name, root.pojoNode(value));
}
else {
// System.out.println("primitive");
root.put(name, value.toString());
}
}
}
return root;
}
}