org.springframework.tuple.JsonStringToTupleConverter.java Source code

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Here is the source code for org.springframework.tuple.JsonStringToTupleConverter.java

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/*
 * Copyright 2002-2015 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.tuple;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import org.springframework.core.convert.converter.Converter;

/**
 * @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;
    }

}