io.druid.segment.EmptyIndexTest.java Source code

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Here is the source code for io.druid.segment.EmptyIndexTest.java

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets licenses this file
 * to you 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.druid.segment;

import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import io.druid.collections.bitmap.ConciseBitmapFactory;
import io.druid.java.util.common.Intervals;
import io.druid.query.aggregation.AggregatorFactory;
import io.druid.segment.column.Column;
import io.druid.segment.incremental.IncrementalIndex;
import io.druid.segment.incremental.IncrementalIndexAdapter;
import org.apache.commons.io.FileUtils;
import org.junit.Assert;
import org.junit.Test;

import java.io.File;

public class EmptyIndexTest {
    @Test
    public void testEmptyIndex() throws Exception {
        File tmpDir = File.createTempFile("emptyIndex", "");
        if (!tmpDir.delete()) {
            throw new IllegalStateException("tmp delete failed");
        }
        if (!tmpDir.mkdir()) {
            throw new IllegalStateException("tmp mkdir failed");
        }

        try {
            IncrementalIndex emptyIndex = new IncrementalIndex.Builder().setSimpleTestingIndexSchema(/* empty */)
                    .setMaxRowCount(1000).buildOnheap();

            IncrementalIndexAdapter emptyIndexAdapter = new IncrementalIndexAdapter(Intervals.of("2012-08-01/P3D"),
                    emptyIndex, new ConciseBitmapFactory());
            TestHelper.getTestIndexMergerV9().merge(Lists.<IndexableAdapter>newArrayList(emptyIndexAdapter), true,
                    new AggregatorFactory[0], tmpDir, new IndexSpec());

            QueryableIndex emptyQueryableIndex = TestHelper.getTestIndexIO().loadIndex(tmpDir);

            Assert.assertEquals("getDimensionNames", 0,
                    Iterables.size(emptyQueryableIndex.getAvailableDimensions()));
            Assert.assertEquals("getMetricNames", 0, Iterables.size(emptyQueryableIndex.getColumnNames()));
            Assert.assertEquals("getDataInterval", Intervals.of("2012-08-01/P3D"),
                    emptyQueryableIndex.getDataInterval());
            Assert.assertEquals("getReadOnlyTimestamps", 0,
                    emptyQueryableIndex.getColumn(Column.TIME_COLUMN_NAME).getLength());
        } finally {
            FileUtils.deleteDirectory(tmpDir);
        }
    }
}