lmdbjava/src/test/java/org/lmdbjava/KeyRangeTest.java at master · lmdbjava/lmdbjava · GitHub

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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 org.lmdbjava;

import static org.assertj.core.api.Assertions.assertThat;

import static org.lmdbjava.KeyRange.all;

import static org.lmdbjava.KeyRange.allBackward;

import static org.lmdbjava.KeyRange.atLeast;

import static org.lmdbjava.KeyRange.atLeastBackward;

import static org.lmdbjava.KeyRange.atMost;

import static org.lmdbjava.KeyRange.atMostBackward;

import static org.lmdbjava.KeyRange.closed;

import static org.lmdbjava.KeyRange.closedBackward;

import static org.lmdbjava.KeyRange.closedOpen;

import static org.lmdbjava.KeyRange.closedOpenBackward;

import static org.lmdbjava.KeyRange.greaterThan;

import static org.lmdbjava.KeyRange.greaterThanBackward;

import static org.lmdbjava.KeyRange.lessThan;

import static org.lmdbjava.KeyRange.lessThanBackward;

import static org.lmdbjava.KeyRange.open;

import static org.lmdbjava.KeyRange.openBackward;

import static org.lmdbjava.KeyRange.openClosed;

import static org.lmdbjava.KeyRange.openClosedBackward;

import static org.lmdbjava.KeyRangeType.IteratorOp.TERMINATE;

import java.util.ArrayList;

import java.util.List;

import org.junit.jupiter.api.BeforeEach;

import org.junit.jupiter.api.Test;

import org.lmdbjava.KeyRangeType.CursorOp;

import org.lmdbjava.KeyRangeType.IteratorOp;

/**

* Test {@link KeyRange}.

* <p>This test case focuses on the contractual correctness detailed in {@link KeyRangeType}. It

* does this using integers as per the JavaDoc examples.

public final class KeyRangeTest {

private final FakeCursor cursor = new FakeCursor();

@BeforeEach

void beforeEach() {

cursor.reset();

}

@Test

void allBackwardTest() {

verify(allBackward(), 8, 6, 4, 2);

}

@Test

void allTest() {

verify(all(), 2, 4, 6, 8);

}

@Test

void atLeastBackwardTest() {

verify(atLeastBackward(5), 4, 2);

verify(atLeastBackward(6), 6, 4, 2);

verify(atLeastBackward(9), 8, 6, 4, 2);

}

@Test

void atLeastTest() {

verify(atLeast(5), 6, 8);

verify(atLeast(6), 6, 8);

}

@Test

void atMostBackwardTest() {

verify(atMostBackward(5), 8, 6);

verify(atMostBackward(6), 8, 6);

}

@Test

void atMostTest() {

verify(atMost(5), 2, 4);

verify(atMost(6), 2, 4, 6);

}

@Test

void closedBackwardTest() {

verify(closedBackward(7, 3), 6, 4);

verify(closedBackward(6, 2), 6, 4, 2);

verify(closedBackward(9, 3), 8, 6, 4);

}

@Test

void closedOpenBackwardTest() {

verify(closedOpenBackward(8, 3), 8, 6, 4);

verify(closedOpenBackward(7, 2), 6, 4);

verify(closedOpenBackward(9, 3), 8, 6, 4);

}

@Test

void closedOpenTest() {

verify(closedOpen(3, 8), 4, 6);

verify(closedOpen(2, 6), 2, 4);

}

@Test

void closedTest() {

verify(closed(3, 7), 4, 6);

verify(closed(2, 6), 2, 4, 6);

}

@Test

void fakeCursor() {

assertThat(cursor.first()).isEqualTo(2);

assertThat(cursor.next()).isEqualTo(4);

assertThat(cursor.next()).isEqualTo(6);

assertThat(cursor.next()).isEqualTo(8);

assertThat(cursor.next()).isNull();

assertThat(cursor.first()).isEqualTo(2);

assertThat(cursor.prev()).isNull();

assertThat(cursor.getWithSetRange(3)).isEqualTo(4);

assertThat(cursor.next()).isEqualTo(6);

assertThat(cursor.getWithSetRange(1)).isEqualTo(2);

assertThat(cursor.last()).isEqualTo(8);

assertThat(cursor.getWithSetRange(100)).isNull();

}

@Test

void greaterThanBackwardTest() {

verify(greaterThanBackward(6), 4, 2);

verify(greaterThanBackward(7), 6, 4, 2);

verify(greaterThanBackward(9), 8, 6, 4, 2);

}

@Test

void greaterThanTest() {

verify(greaterThan(4), 6, 8);

verify(greaterThan(3), 4, 6, 8);

}

@Test

void lessThanBackwardTest() {

verify(lessThanBackward(5), 8, 6);

verify(lessThanBackward(2), 8, 6, 4);

}

@Test

void lessThanTest() {

verify(lessThan(5), 2, 4);

verify(lessThan(8), 2, 4, 6);

}

@Test

void openBackwardTest() {

verify(openBackward(7, 2), 6, 4);

verify(openBackward(8, 1), 6, 4, 2);

verify(openBackward(9, 4), 8, 6);

}

@Test

void openClosedBackwardTest() {

verify(openClosedBackward(7, 2), 6, 4, 2);

verify(openClosedBackward(8, 4), 6, 4);

verify(openClosedBackward(9, 4), 8, 6, 4);

}

@Test

void openClosedTest() {

verify(openClosed(3, 8), 4, 6, 8);

verify(openClosed(2, 6), 4, 6);

}

@Test

void openTest() {

verify(open(3, 7), 4, 6);

verify(open(2, 8), 4, 6);

}

private void verify(final KeyRange<Integer> range, final int... expected) {

final List<Integer> results = new ArrayList<>();

Integer buff = cursor.apply(range.getType().initialOp(), range.getStart());

IteratorOp op;

do {

final Integer finalBuff = buff;

final RangeComparator rangeComparator =

new CursorIterable.JavaRangeComparator<>(range, Integer::compareTo, () -> finalBuff);

op = range.getType().iteratorOp(buff, rangeComparator);

switch (op) {

case CALL_NEXT_OP:

buff = cursor.apply(range.getType().nextOp(), range.getStart());

break;

case TERMINATE:

break;

case RELEASE:

results.add(buff);

buff = cursor.apply(range.getType().nextOp(), range.getStart());

break;

default:

throw new IllegalStateException("Unknown operation");

}

} while (op != TERMINATE);

for (int idx = 0; idx < results.size(); idx++) {

assertThat(results.get(idx)).withFailMessage("idx " + idx).isEqualTo(expected[idx]);

}

assertThat(results.size()).isEqualTo(expected.length);

}

/**

* Cursor that behaves like an LMDB cursor would.

* <p>We use <code>Integer</code> rather than the primitive to represent a <code>null</code>

* buffer.

private static final class FakeCursor {

private static final int[] KEYS = new int[] {2, 4, 6, 8};

private int position;

Integer apply(final CursorOp op, final Integer startKey) {

final Integer key;

switch (op) {

case FIRST:

return first();

case LAST:

return last();

case NEXT:

return next();

case PREV:

return prev();

case GET_START_KEY:

return getWithSetRange(startKey);

case GET_START_KEY_BACKWARD:

key = getWithSetRange(startKey);

if (key != null) {

return key;

}

return last();

default:

throw new IllegalStateException("Unknown operation");

}

Integer first() {

position = 0;

return KEYS[position];

}

Integer getWithSetRange(final Integer startKey) {

for (int idx = 0; idx < KEYS.length; idx++) {

final int candidate = KEYS[idx];

if (candidate == startKey || candidate > startKey) {

position = idx;

return KEYS[position];

}

return null;

}

Integer last() {

position = KEYS.length - 1;

return KEYS[position];

}

Integer next() {

position += 1;

if (position == KEYS.length) {

return null;

}

return KEYS[position];

}

Integer prev() {

position -= 1;

if (position == -1) {

return null;

}

return KEYS[position];

}

void reset() {

position = 0;

}

lmdbjava/src/test/java/org/lmdbjava/KeyRangeTest.java at master · lmdbjava/lmdbjava · GitHub

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