IntervalTreeTest.java example

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package org.apache.cassandra.utils;
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 * to you under the Apache License, Version 2.0 (the
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import org.junit.Test;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.io.*;

import static org.junit.Assert.*;

import org.apache.cassandra.db.TypeSizes;
import org.apache.cassandra.io.ISerializer;
import org.apache.cassandra.io.IVersionedSerializer;

public class IntervalTreeTest
{
    @Test
    public void testSearch() throws Exception
    {
        List<Interval<Integer, Void>> intervals = new ArrayList<Interval<Integer, Void>>();

        intervals.add(Interval.<Integer, Void>create(-300, -200));
        intervals.add(Interval.<Integer, Void>create(-3, -2));
        intervals.add(Interval.<Integer, Void>create(1,2));
        intervals.add(Interval.<Integer, Void>create(3,6));
        intervals.add(Interval.<Integer, Void>create(2,4));
        intervals.add(Interval.<Integer, Void>create(5,7));
        intervals.add(Interval.<Integer, Void>create(1,3));
        intervals.add(Interval.<Integer, Void>create(4,6));
        intervals.add(Interval.<Integer, Void>create(8,9));
        intervals.add(Interval.<Integer, Void>create(15,20));
        intervals.add(Interval.<Integer, Void>create(40,50));
        intervals.add(Interval.<Integer, Void>create(49,60));


        IntervalTree<Integer, Void, Interval<Integer, Void>> it = IntervalTree.build(intervals);

        assertEquals(3, it.search(Interval.<Integer, Void>create(4,4)).size());
        assertEquals(4, it.search(Interval.<Integer, Void>create(4, 5)).size());
        assertEquals(7, it.search(Interval.<Integer, Void>create(-1,10)).size());
        assertEquals(0, it.search(Interval.<Integer, Void>create(-1,-1)).size());
        assertEquals(5, it.search(Interval.<Integer, Void>create(1,4)).size());
        assertEquals(2, it.search(Interval.<Integer, Void>create(0,1)).size());
        assertEquals(0, it.search(Interval.<Integer, Void>create(10,12)).size());

        List<Interval<Integer, Void>> intervals2 = new ArrayList<Interval<Integer, Void>>();

        //stravinsky 1880-1971
        intervals2.add(Interval.<Integer, Void>create(1880, 1971));
        //Schoenberg
        intervals2.add(Interval.<Integer, Void>create(1874, 1951));
        //Grieg
        intervals2.add(Interval.<Integer, Void>create(1843, 1907));
        //Schubert
        intervals2.add(Interval.<Integer, Void>create(1779, 1828));
        //Mozart
        intervals2.add(Interval.<Integer, Void>create(1756, 1828));
        //Schuetz
        intervals2.add(Interval.<Integer, Void>create(1585, 1672));

        IntervalTree<Integer, Void, Interval<Integer, Void>> it2 = IntervalTree.build(intervals2);

        assertEquals(0, it2.search(Interval.<Integer, Void>create(1829, 1842)).size());

        List<Void> intersection1 = it2.search(Interval.<Integer, Void>create(1907, 1907));
        assertEquals(3, intersection1.size());

        intersection1 = it2.search(Interval.<Integer, Void>create(1780, 1790));
        assertEquals(2, intersection1.size());

    }

    @Test
    public void testIteration()
    {
        List<Interval<Integer, Void>> intervals = new ArrayList<Interval<Integer, Void>>();

        intervals.add(Interval.<Integer, Void>create(-300, -200));
        intervals.add(Interval.<Integer, Void>create(-3, -2));
        intervals.add(Interval.<Integer, Void>create(1,2));
        intervals.add(Interval.<Integer, Void>create(3,6));
        intervals.add(Interval.<Integer, Void>create(2,4));
        intervals.add(Interval.<Integer, Void>create(5,7));
        intervals.add(Interval.<Integer, Void>create(1,3));
        intervals.add(Interval.<Integer, Void>create(4,6));
        intervals.add(Interval.<Integer, Void>create(8,9));
        intervals.add(Interval.<Integer, Void>create(15,20));
        intervals.add(Interval.<Integer, Void>create(40,50));
        intervals.add(Interval.<Integer, Void>create(49,60));

        IntervalTree<Integer, Void, Interval<Integer, Void>> it = IntervalTree.build(intervals);

        Collections.sort(intervals, it.minOrdering);

        List<Interval<Integer, Void>> l = new ArrayList<Interval<Integer, Void>>();
        for (Interval<Integer, Void> i : it)
            l.add(i);

        assertEquals(intervals, l);
    }

    @Test
    public void testSerialization() throws Exception
    {
        List<Interval<Integer, String>> intervals = new ArrayList<Interval<Integer, String>>();

        intervals.add(Interval.<Integer, String>create(-300, -200, "a"));
        intervals.add(Interval.<Integer, String>create(-3, -2, "b"));
        intervals.add(Interval.<Integer, String>create(1,2, "c"));
        intervals.add(Interval.<Integer, String>create(1,3, "d"));
        intervals.add(Interval.<Integer, String>create(2,4, "e"));
        intervals.add(Interval.<Integer, String>create(3,6, "f"));
        intervals.add(Interval.<Integer, String>create(4,6, "g"));
        intervals.add(Interval.<Integer, String>create(5,7, "h"));
        intervals.add(Interval.<Integer, String>create(8,9, "i"));
        intervals.add(Interval.<Integer, String>create(15,20, "j"));
        intervals.add(Interval.<Integer, String>create(40,50, "k"));
        intervals.add(Interval.<Integer, String>create(49,60, "l"));

        IntervalTree<Integer, String, Interval<Integer, String>> it = IntervalTree.build(intervals);

        IVersionedSerializer<IntervalTree<Integer, String, Interval<Integer, String>>> serializer = IntervalTree.serializer(
            new ISerializer<Integer>()
            {
                public void serialize(Integer i, DataOutput out) throws IOException { out.writeInt(i); }
                public Integer deserialize(DataInput in) throws IOException { return in.readInt(); }
                public long serializedSize(Integer i, TypeSizes ts) { return 4; }
            },
            new ISerializer<String>()
            {
                public void serialize(String v, DataOutput out) throws IOException { out.writeUTF(v); }
                public String deserialize(DataInput in) throws IOException { return in.readUTF(); }
                public long serializedSize(String v, TypeSizes ts) { return v.length(); }
            },
            Interval.class.getConstructor(Object.class, Object.class, Object.class)
        );

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream out = new DataOutputStream(baos);

        serializer.serialize(it, out, 0);

        DataInputStream in = new DataInputStream(new ByteArrayInputStream(baos.toByteArray()));

        IntervalTree<Integer, String, Interval<Integer, String>> it2 = serializer.deserialize(in, 0);
        List<Interval<Integer, String>> intervals2 = new ArrayList<Interval<Integer, String>>();
        for (Interval<Integer, String> i : it2)
            intervals2.add(i);

        assertEquals(intervals, intervals2);
    }
}