world.data.jdbc.internal.transport.FieldParser Maven / Gradle / Ivy

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/*
 * dw-jdbc
 * Copyright 2017 data.world, Inc.

 * 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.
 *
 * This product includes software developed at data.world, Inc.(http://www.data.world/).
 */
package world.data.jdbc.internal.transport;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;

import java.io.IOException;

import static world.data.jdbc.internal.transport.ParserUtil.expect;

/**
 * Helper for parsing a sequence of json object field/value pairs.
 */
@FunctionalInterface
interface FieldParser {

    void parse(String field, JsonToken token) throws IOException;

    static void parseObject(JsonParser parser, FieldParser fieldParser) throws IOException {
        expect(parser, parser.getCurrentToken(), JsonToken.START_OBJECT);
        String field;
        while ((field = parser.nextFieldName()) != null) {
            fieldParser.parse(field, parser.nextToken());
            // Skip unconsumed child arrays/objects, for backwards/forwards compatibility
            parser.skipChildren();
        }
        expect(parser, parser.getCurrentToken(), JsonToken.END_OBJECT);
    }
}