com.github.jcustenborder.kafka.connect.spooldir.JsonSchemaGenerator.java Source code

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Here is the source code for com.github.jcustenborder.kafka.connect.spooldir.JsonSchemaGenerator.java

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/**
 * Copyright  2016 Jeremy Custenborder (jcustenborder@gmail.com)
 *
 * 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.github.jcustenborder.kafka.connect.spooldir;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.JsonNode;
import com.github.jcustenborder.kafka.connect.utils.jackson.ObjectMapperFactory;
import org.apache.kafka.connect.data.Schema;

import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

public class JsonSchemaGenerator extends SchemaGenerator<SpoolDirJsonSourceConnectorConfig> {
    public JsonSchemaGenerator(Map<String, ?> settings) {
        super(settings);
    }

    @Override
    protected SpoolDirJsonSourceConnectorConfig config(Map<String, ?> settings) {
        return new SpoolDirJsonSourceConnectorConfig(false, settings);
    }

    @Override
    protected Map<String, Schema.Type> determineFieldTypes(InputStream inputStream) throws IOException {
        Map<String, Schema.Type> typeMap = new LinkedHashMap<>();

        JsonFactory factory = new JsonFactory();
        try (JsonParser parser = factory.createParser(inputStream)) {
            Iterator<JsonNode> iterator = ObjectMapperFactory.INSTANCE.readValues(parser, JsonNode.class);
            while (iterator.hasNext()) {
                JsonNode node = iterator.next();
                if (node.isObject()) {
                    Iterator<String> fieldNames = node.fieldNames();
                    while (fieldNames.hasNext()) {
                        typeMap.put(fieldNames.next(), Schema.Type.STRING);
                    }
                    break;
                }
            }
        }

        return typeMap;
    }
}