/*
* 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 java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import org.springframework.core.convert.converter.Converter;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* @author David Turanski
*
*/
public class JsonStringToTupleConverter implements Converter<String, Tuple> {
private final ObjectMapper mapper = new ObjectMapper();
public JsonStringToTupleConverter() {
mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
}
@Override
public Tuple convert(String source) {
TupleBuilder builder = TupleBuilder.tuple();
try {
JsonNode root = mapper.readTree(source);
for (Iterator<Entry<String, JsonNode>> it = root.fields(); it.hasNext();) {
Entry<String, JsonNode> entry = it.next();
String name = entry.getKey();
JsonNode node = entry.getValue();
if (node.isObject()) {
// tuple
builder.addEntry(name, convert(node.toString()));
}
else if (node.isArray()) {
builder.addEntry(name, nodeToList(node));
}
else if (node.isNull()) {
builder.addEntry(name, null);
}
else if (node.isBoolean()) {
builder.addEntry(name, node.booleanValue());
}
else if (node.isNumber()) {
builder.addEntry(name, node.numberValue());
}
else {
builder.addEntry(name, mapper.treeToValue(node, Object.class));
}
}
}
catch (Exception e) {
throw new RuntimeException(e);
}
return builder.build();
}
private List<Object> nodeToList(JsonNode node) throws JsonProcessingException {
List<Object> list = new ArrayList<Object>(node.size());
for (int i = 0; i < node.size(); i++) {
JsonNode item = node.get(i);
if (item.isObject()) {
list.add(convert(item.toString()));
}
else if (item.isArray()) {
list.add(nodeToList(item));
}
else if (item.isNull()) {
list.add(null);
}
else if (item.isBoolean()) {
list.add(item.booleanValue());
}
else if (item.isNumber()) {
list.add(item.numberValue());
}
else {
list.add(mapper.treeToValue(item, Object.class));
}
}
return list;
}
}