com.databend.client.ParseJsonDataUtils Maven / Gradle / Ivy

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/*
 * 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.databend.client;

import com.databend.client.data.ColumnTypeHandler;
import com.databend.client.data.ColumnTypeHandlerFactory;
import com.google.common.collect.ImmutableList;

import java.util.ArrayList;
import java.util.List;

import static java.util.Collections.unmodifiableList;


final class ParseJsonDataUtils
{
    private ParseJsonDataUtils() {}
    /**
     * parseRawData is used to convert json data an immutable list of data
     * input QuerySchema: contains column names and types
     * input List> : a list of rows parsed from QueryResponse
     * output Iterable> : convert the input rows into DatabendType and return an immutable list
     */
    public static Iterable> parseRawData(List schema, List> data)
    {
        if (data == null || schema == null ) {
            return null;
        }
        ColumnTypeHandler[] typeHandlers = createTypeHandlers(schema);
        // ensure parsed data is thread safe
        ImmutableList.Builder> rows = ImmutableList.builderWithExpectedSize(data.size());
        for (List