io.prestosql.plugin.example.ExampleRecordSet.java Source code

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Here is the source code for io.prestosql.plugin.example.ExampleRecordSet.java

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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 io.prestosql.plugin.example;

import com.google.common.collect.ImmutableList;
import com.google.common.io.ByteSource;
import com.google.common.io.Resources;
import io.prestosql.spi.connector.RecordCursor;
import io.prestosql.spi.connector.RecordSet;
import io.prestosql.spi.type.Type;

import java.net.MalformedURLException;
import java.util.List;

import static java.util.Objects.requireNonNull;

public class ExampleRecordSet implements RecordSet {
    private final List<ExampleColumnHandle> columnHandles;
    private final List<Type> columnTypes;
    private final ByteSource byteSource;

    public ExampleRecordSet(ExampleSplit split, List<ExampleColumnHandle> columnHandles) {
        requireNonNull(split, "split is null");

        this.columnHandles = requireNonNull(columnHandles, "column handles is null");
        ImmutableList.Builder<Type> types = ImmutableList.builder();
        for (ExampleColumnHandle column : columnHandles) {
            types.add(column.getColumnType());
        }
        this.columnTypes = types.build();

        try {
            byteSource = Resources.asByteSource(split.getUri().toURL());
        } catch (MalformedURLException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public List<Type> getColumnTypes() {
        return columnTypes;
    }

    @Override
    public RecordCursor cursor() {
        return new ExampleRecordCursor(columnHandles, byteSource);
    }
}