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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.slime;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class DecodeIndexTest {
@Test
public void testSimpleUsage() {
DecodeIndex index = new DecodeIndex();
int val1 = index.reserve(1);
int val2 = index.reserve(3);
int val3 = index.reserve(2);
assertEquals(0, val1);
assertEquals(1, val2);
assertEquals(4, val3);
assertEquals(6, index.size());
index.set(val1 + 0, 0, val2, 0);
index.set(val2 + 0, 100, 0, 1);
index.set(val2 + 1, 200, val3, 2);
index.set(val2 + 2, 300, 0, 3);
index.set(val3 + 0, 400, 0, 0);
index.set(val3 + 1, 500, 0, 0);
for (int i = 0; i < 6; i++) {
assertEquals(i * 100, index.getByteOffset(i));
if (i == 0) {
assertEquals(1, index.getFirstChild(i));
} else if (i == 2) {
assertEquals(4, index.getFirstChild(i));
} else {
assertEquals(0, index.getFirstChild(i));
}
if (i < 4) {
assertEquals(i, index.getExtBits(i));
} else {
assertEquals(0, index.getExtBits(i));
}
}
}
@Test
public void testManyValues() {
DecodeIndex index = new DecodeIndex();
int outer = 47;
int inner = 73;
int expectOffset = 0;
for (int i = 0; i < outer; i++) {
int offset = index.reserve(inner);
assertEquals(expectOffset, offset);
expectOffset += inner;
for (int j = 0; j < inner; j++) {
index.set(offset + j, (i * j), (i + j), (j & 3));
}
}
assertEquals(inner * outer, expectOffset);
assertEquals(inner * outer, index.size());
for (int i = 0; i < outer; i++) {
for (int j = 0; j < inner; j++) {
int offset = i * inner + j;
assertEquals(i * j, index.getByteOffset(offset));
assertEquals(i + j, index.getFirstChild(offset));
assertEquals(j & 3, index.getExtBits(offset));
}
}
}
@Test
public void testOverflowNoBleed() {
DecodeIndex index = new DecodeIndex();
index.reserve(3);
index.set(0, 0xffff_ffff, 0, 0);
index.set(1, 0, 0xffff_ffff, 0);
index.set(2, 0, 0, 0xffff_ffff);
assertEquals(0x7fff_ffff, index.getByteOffset(0));
assertEquals(0, index.getByteOffset(1));
assertEquals(0, index.getByteOffset(2));
assertEquals(0, index.getFirstChild(0));
assertEquals(0x7fff_ffff, index.getFirstChild(1));
assertEquals(0, index.getFirstChild(2));
assertEquals(0, index.getExtBits(0));
assertEquals(0, index.getExtBits(1));
assertEquals(3, index.getExtBits(2));
}
}
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