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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 io.netty.buffer.PooledByteBufAllocator.DEFAULT;

import static java.nio.charset.StandardCharsets.US_ASCII;

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

import static org.lmdbjava.ByteArrayProxy.PROXY_BA;

import static org.lmdbjava.ByteBufProxy.PROXY_NETTY;

import static org.lmdbjava.ByteBufferProxy.PROXY_OPTIMAL;

import static org.lmdbjava.ComparatorResult.EQUAL_TO;

import static org.lmdbjava.ComparatorResult.GREATER_THAN;

import static org.lmdbjava.ComparatorResult.LESS_THAN;

import static org.lmdbjava.DirectBufferProxy.PROXY_DB;

import com.google.common.primitives.SignedBytes;

import com.google.common.primitives.UnsignedBytes;

import io.netty.buffer.ByteBuf;

import java.nio.ByteBuffer;

import java.util.Arrays;

import java.util.Comparator;

import java.util.stream.Stream;

import org.agrona.DirectBuffer;

import org.agrona.concurrent.UnsafeBuffer;

import org.junit.jupiter.api.extension.ExtensionContext;

import org.junit.jupiter.params.ParameterizedTest;

import org.junit.jupiter.params.provider.Arguments;

import org.junit.jupiter.params.provider.ArgumentsProvider;

import org.junit.jupiter.params.provider.ArgumentsSource;

import org.junit.jupiter.params.support.ParameterDeclarations;

/** Tests comparator functions are consistent across buffers. */

public final class ComparatorTest {

// H = 1 (high), L = 0 (low), X = byte not set in buffer

private static final byte[] HL = buffer(1, 0);

private static final byte[] HLLLLLLL = buffer(1, 0, 0, 0, 0, 0, 0, 0);

private static final byte[] HLLLLLLX = buffer(1, 0, 0, 0, 0, 0, 0);

private static final byte[] HX = buffer(1);

private static final byte[] LH = buffer(0, 1);

private static final byte[] LHLLLLLL = buffer(0, 1, 0, 0, 0, 0, 0, 0);

private static final byte[] LL = buffer(0, 0);

private static final byte[] LLLLLLLL = buffer(0, 0, 0, 0, 0, 0, 0, 0);

private static final byte[] LLLLLLLX = buffer(0, 0, 0, 0, 0, 0, 0);

private static final byte[] LX = buffer(0);

private static final byte[] XX = buffer();

static class MyArgumentProvider implements ArgumentsProvider {

@Override

public Stream<? extends Arguments> provideArguments(

ParameterDeclarations parameters, ExtensionContext context) {

return Stream.of(

Arguments.argumentSet("StringRunner", new StringRunner()),

Arguments.argumentSet("DirectBufferRunner", new DirectBufferRunner()),

Arguments.argumentSet("ByteArrayRunner", new ByteArrayRunner()),

Arguments.argumentSet("UnsignedByteArrayRunner", new UnsignedByteArrayRunner()),

Arguments.argumentSet("ByteBufferRunner", new ByteBufferRunner()),

Arguments.argumentSet("NettyRunner", new NettyRunner()),

Arguments.argumentSet("GuavaUnsignedBytes", new GuavaUnsignedBytes()),

Arguments.argumentSet("GuavaSignedBytes", new GuavaSignedBytes()));

}

private static byte[] buffer(final int... bytes) {

final byte[] array = new byte[bytes.length];

for (int i = 0; i < bytes.length; i++) {

array[i] = (byte) bytes[i];

}

return array;

}

@ParameterizedTest

@ArgumentsSource(MyArgumentProvider.class)

void atLeastOneBufferHasEightBytes(final ComparatorRunner comparator) {

assertThat(TestUtils.compare(comparator, HLLLLLLL, LLLLLLLL)).isEqualTo(GREATER_THAN);

assertThat(TestUtils.compare(comparator, LLLLLLLL, HLLLLLLL)).isEqualTo(LESS_THAN);

assertThat(TestUtils.compare(comparator, LHLLLLLL, LLLLLLLL)).isEqualTo(GREATER_THAN);

assertThat(TestUtils.compare(comparator, LLLLLLLL, LHLLLLLL)).isEqualTo(LESS_THAN);

assertThat(TestUtils.compare(comparator, LLLLLLLL, LLLLLLLX)).isEqualTo(GREATER_THAN);

assertThat(TestUtils.compare(comparator, LLLLLLLX, LLLLLLLL)).isEqualTo(LESS_THAN);

assertThat(TestUtils.compare(comparator, HLLLLLLL, HLLLLLLX)).isEqualTo(GREATER_THAN);

assertThat(TestUtils.compare(comparator, HLLLLLLX, HLLLLLLL)).isEqualTo(LESS_THAN);

assertThat(TestUtils.compare(comparator, HLLLLLLX, LHLLLLLL)).isEqualTo(GREATER_THAN);

assertThat(TestUtils.compare(comparator, LHLLLLLL, HLLLLLLX)).isEqualTo(LESS_THAN);

}

@ParameterizedTest

@ArgumentsSource(MyArgumentProvider.class)

void buffersOfTwoBytes(final ComparatorRunner comparator) {

assertThat(TestUtils.compare(comparator, LL, XX)).isEqualTo(GREATER_THAN);

assertThat(TestUtils.compare(comparator, XX, LL)).isEqualTo(LESS_THAN);

assertThat(TestUtils.compare(comparator, LL, LX)).isEqualTo(GREATER_THAN);

assertThat(TestUtils.compare(comparator, LX, LL)).isEqualTo(LESS_THAN);

assertThat(TestUtils.compare(comparator, LH, LX)).isEqualTo(GREATER_THAN);

assertThat(TestUtils.compare(comparator, LX, HL)).isEqualTo(LESS_THAN);

assertThat(TestUtils.compare(comparator, HX, LL)).isEqualTo(GREATER_THAN);

assertThat(TestUtils.compare(comparator, LH, HX)).isEqualTo(LESS_THAN);

}

@ParameterizedTest

@ArgumentsSource(MyArgumentProvider.class)

void equalBuffers(final ComparatorRunner comparator) {

assertThat(TestUtils.compare(comparator, LL, LL)).isEqualTo(EQUAL_TO);

assertThat(TestUtils.compare(comparator, HX, HX)).isEqualTo(EQUAL_TO);

assertThat(TestUtils.compare(comparator, LH, LH)).isEqualTo(EQUAL_TO);

assertThat(TestUtils.compare(comparator, LL, LL)).isEqualTo(EQUAL_TO);

assertThat(TestUtils.compare(comparator, LX, LX)).isEqualTo(EQUAL_TO);

assertThat(TestUtils.compare(comparator, HLLLLLLL, HLLLLLLL)).isEqualTo(EQUAL_TO);

assertThat(TestUtils.compare(comparator, HLLLLLLX, HLLLLLLX)).isEqualTo(EQUAL_TO);

assertThat(TestUtils.compare(comparator, LHLLLLLL, LHLLLLLL)).isEqualTo(EQUAL_TO);

assertThat(TestUtils.compare(comparator, LLLLLLLL, LLLLLLLL)).isEqualTo(EQUAL_TO);

assertThat(TestUtils.compare(comparator, LLLLLLLX, LLLLLLLX)).isEqualTo(EQUAL_TO);

}

/** Tests {@link ByteArrayProxy}. */

private static final class ByteArrayRunner implements ComparatorRunner {

@Override

public int compare(final byte[] o1, final byte[] o2) {

final Comparator<byte[]> c = PROXY_BA.getComparator();

return c.compare(o1, o2);

}

/** Tests {@link ByteArrayProxy} (unsigned). */

private static final class UnsignedByteArrayRunner implements ComparatorRunner {

@Override

public int compare(final byte[] o1, final byte[] o2) {

final Comparator<byte[]> c = PROXY_BA.getComparator();

return c.compare(o1, o2);

}

/** Tests {@link ByteBufferProxy}. */

private static final class ByteBufferRunner implements ComparatorRunner {

@Override

public int compare(final byte[] o1, final byte[] o2) {

final Comparator<ByteBuffer> c = PROXY_OPTIMAL.getComparator();

// Convert arrays to buffers that are larger than the array, with

// limit set at the array length. One buffer bigger than the other.

ByteBuffer o1b = arrayToBuffer(o1, o1.length * 3);

ByteBuffer o2b = arrayToBuffer(o2, o2.length * 2);

final int result = c.compare(o1b, o2b);

// Now swap which buffer is bigger

o1b = arrayToBuffer(o1, o1.length * 2);

o2b = arrayToBuffer(o2, o2.length * 3);

final int result2 = c.compare(o1b, o2b);

assertThat(result2).isEqualTo(result);

// Now try with buffers sized to the array.

o1b = ByteBuffer.wrap(o1);

o2b = ByteBuffer.wrap(o2);

final int result3 = c.compare(o1b, o2b);

assertThat(result3).isEqualTo(result);

return result;

}

private ByteBuffer arrayToBuffer(final byte[] arr, final int bufferCapacity) {

if (bufferCapacity < arr.length) {

throw new IllegalArgumentException("bufferCapacity < arr.length");

}

final byte[] newArr = Arrays.copyOf(arr, bufferCapacity);

final ByteBuffer byteBuffer = ByteBuffer.wrap(newArr);

byteBuffer.limit(arr.length);

byteBuffer.position(0);

return byteBuffer;

}

/** Tests {@link DirectBufferProxy}. */

private static final class DirectBufferRunner implements ComparatorRunner {

@Override

public int compare(final byte[] o1, final byte[] o2) {

final DirectBuffer o1b = new UnsafeBuffer(o1);

final DirectBuffer o2b = new UnsafeBuffer(o2);

final Comparator<DirectBuffer> c = PROXY_DB.getComparator();

return c.compare(o1b, o2b);

}

/** Tests using Guava's {@link SignedBytes} comparator. */

private static final class GuavaSignedBytes implements ComparatorRunner {

@Override

public int compare(final byte[] o1, final byte[] o2) {

final Comparator<byte[]> c = SignedBytes.lexicographicalComparator();

return c.compare(o1, o2);

}

/** Tests using Guava's {@link UnsignedBytes} comparator. */

private static final class GuavaUnsignedBytes implements ComparatorRunner {

@Override

public int compare(final byte[] o1, final byte[] o2) {

final Comparator<byte[]> c = UnsignedBytes.lexicographicalComparator();

return c.compare(o1, o2);

}

/** Tests {@link ByteBufProxy}. */

private static final class NettyRunner implements ComparatorRunner {

@Override

public int compare(final byte[] o1, final byte[] o2) {

final ByteBuf o1b = DEFAULT.directBuffer(o1.length);

final ByteBuf o2b = DEFAULT.directBuffer(o2.length);

o1b.writeBytes(o1);

o2b.writeBytes(o2);

final Comparator<ByteBuf> c = PROXY_NETTY.getComparator();

return c.compare(o1b, o2b);

}

/**

* Tests {@link String} by providing a reference implementation of what a comparator involving

* ASCII-encoded bytes should return.

private static final class StringRunner implements ComparatorRunner {

@Override

public int compare(final byte[] o1, final byte[] o2) {

final String o1s = new String(o1, US_ASCII);

final String o2s = new String(o2, US_ASCII);

return o1s.compareTo(o2s);

}

/** Interface that can test a {@link BufferProxy} <code>compare</code> method. */

private interface ComparatorRunner extends Comparator<byte[]> {

/**

* Convert the passed byte arrays into the proxy's relevant buffer type and then invoke the

* comparator.

* @param o1 lhs buffer content

* @param o2 rhs buffer content

* @return as per {@link Comparable}

@Override

int compare(byte[] o1, byte[] o2);

}