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Some love for java generics

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themode 2021-12-28 12:01:36 +01:00 committed by TheMode
parent 18d8e60064
commit 7b328d3d4c
2 changed files with 89 additions and 23 deletions
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85
src/main/java/net/minestom/server/utils/block/BlockUtils.java
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@ -1,12 +1,10 @@
package net.minestom.server.utils.block;
import it.unimi.dsi.fastutil.objects.Object2ObjectArrayMap;
import net.minestom.server.coordinate.Point;
import net.minestom.server.instance.Instance;
import net.minestom.server.instance.block.Block;
import net.minestom.server.utils.StringUtils;
import java.util.Collections;
import java.util.Map;
public class BlockUtils {
@ -58,29 +56,70 @@ public class BlockUtils {
public static Map<String, String> parseProperties(String query) {
if (!query.startsWith("[") || !query.endsWith("]") ||
query.equals("[]")) {
return Collections.emptyMap();
return Map.of();
}
final int capacity = StringUtils.countMatches(query, ',') + 1;
Object2ObjectArrayMap<String, String> result = new Object2ObjectArrayMap<>(capacity);
final String propertiesString = query.substring(1);
StringBuilder keyBuilder = new StringBuilder();
StringBuilder valueBuilder = new StringBuilder();
StringBuilder builder = keyBuilder;
for (int i = 0; i < propertiesString.length(); i++) {
final char c = propertiesString.charAt(i);
if (c == '=') {
// Switch to value builder
builder = valueBuilder;
} else if (c == ',' || c == ']') {
// Append current text
result.put(keyBuilder.toString().intern(), valueBuilder.toString().intern());
keyBuilder = new StringBuilder();
valueBuilder = new StringBuilder();
builder = keyBuilder;
} else if (c != ' ') {
builder.append(c);
final String propertiesString = query.substring(1, query.length() - 1).trim();
if (propertiesString.isEmpty()) {
return Map.of();
}
final int capacity = StringUtils.countMatches(propertiesString, ',') + 1;
String[] entries = new String[capacity * 2];
int entryIndex = 0;
final int length = propertiesString.length();
int start = 0;
int end;
int index = 0;
while (index < length) {
if (propertiesString.charAt(index) == ',' || index == length - 1) {
if (index + 1 == length) index++;
end = index;
final String property = propertiesString.substring(start, end);
final int equalIndex = property.indexOf('=');
if (equalIndex != -1) {
final String key = property.substring(0, equalIndex).trim();
final String value = property.substring(equalIndex + 1).trim();
entries[entryIndex++] = key;
entries[entryIndex++] = value;
}
start = end + 1;
}
index++;
}
return result;
return switch (entryIndex / 2) {
case 0 -> Map.of();
case 1 -> Map.of(entries[0], entries[1]);
case 2 -> Map.of(entries[0], entries[1], entries[2], entries[3]);
case 3 -> Map.of(entries[0], entries[1],
entries[2], entries[3], entries[4], entries[5]);
case 4 -> Map.of(entries[0], entries[1], entries[2], entries[3],
entries[4], entries[5], entries[6], entries[7]);
case 5 -> Map.of(entries[0], entries[1], entries[2], entries[3],
entries[4], entries[5], entries[6], entries[7],
entries[8], entries[9]);
case 6 -> Map.of(entries[0], entries[1], entries[2], entries[3],
entries[4], entries[5], entries[6], entries[7],
entries[8], entries[9], entries[10], entries[11]);
case 7 -> Map.of(entries[0], entries[1], entries[2], entries[3],
entries[4], entries[5], entries[6], entries[7],
entries[8], entries[9], entries[10], entries[11],
entries[12], entries[13]);
case 8 -> Map.of(entries[0], entries[1], entries[2], entries[3],
entries[4], entries[5], entries[6], entries[7],
entries[8], entries[9], entries[10], entries[11],
entries[12], entries[13], entries[14], entries[15]);
case 9 -> Map.of(entries[0], entries[1], entries[2], entries[3],
entries[4], entries[5], entries[6], entries[7],
entries[8], entries[9], entries[10], entries[11],
entries[12], entries[13], entries[14], entries[15],
entries[16], entries[17]);
case 10 -> Map.of(entries[0], entries[1], entries[2], entries[3],
entries[4], entries[5], entries[6], entries[7],
entries[8], entries[9], entries[10], entries[11],
entries[12], entries[13], entries[14], entries[15],
entries[16], entries[17], entries[18], entries[19]);
default -> throw new IllegalArgumentException("Too many properties: " + (entryIndex / 2));
};
}
}

27
src/test/java/instance/BlockTest.java
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@ -1,6 +1,7 @@
package instance;
import net.minestom.server.instance.block.Block;
import net.minestom.server.utils.block.BlockUtils;
import org.jglrxavpok.hephaistos.nbt.NBT;
import org.jglrxavpok.hephaistos.nbt.NBTCompound;
import org.junit.jupiter.api.Test;
@ -43,6 +44,32 @@ public class BlockTest {
assertThrows(Exception.class, () -> block.withProperty("random", "randomKey"));
}
@Test
public void parseProperties() {
assertEquals(Map.of(), BlockUtils.parseProperties("random test without brackets"));
assertEquals(Map.of(), BlockUtils.parseProperties("[]"));
assertEquals(Map.of(), BlockUtils.parseProperties("[ ]"));
assertEquals(Map.of("facing", "east"), BlockUtils.parseProperties("[facing=east]"));
assertEquals(Map.of("facing", "east", "key", "value"), BlockUtils.parseProperties("[facing=east,key=value ]"));
assertEquals(Map.of("facing", "east", "key", "value"), BlockUtils.parseProperties("[ facing = east, key= value ]"));
// Verify until the limit of 10 entries
for (int i = 0; i < 11; i++) {
StringBuilder properties = new StringBuilder("[");
for (int j = 0; j < i; j++) {
properties.append("key").append(j).append("=value").append(j);
if (j != i - 1) properties.append(",");
}
properties.append("]");
var map = BlockUtils.parseProperties(properties.toString());
assertEquals(i, map.size());
for (int j = 0; j < i; j++) {
assertEquals("value" + j, map.get("key" + j));
}
}
}
@Test
public void testEquality() {
var nbt = new NBTCompound(Map.of("key", NBT.Int(5)));