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/*
* Copyright (C) 2020 ActiveJ LLC.
*
* 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 io.activej.common;
import io.activej.common.exception.MalformedDataException;
import org.jetbrains.annotations.Contract;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.nio.file.Path;
import java.util.*;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Supplier;
import static io.activej.common.Checks.checkNotNull;
import static java.util.Collections.*;
public class Utils {
public static T of(Supplier supplier) {
return supplier.get();
}
public static T firstNonNull(@Nullable T a, T b) {
return a != null ? a : b;
}
public static T firstNonNull(@Nullable T a, @Nullable T b, T c) {
return a != null ? a : (b != null ? b : c);
}
@SafeVarargs
public static T firstNonNull(T... values) {
for (T value : values) {
if (value != null) {
return value;
}
}
return null;
}
public static String nullToEmpty(@Nullable String value) {
return value != null ? value : "";
}
public static Set nullToEmpty(@Nullable Set set) {
return nullToDefault(set, emptySet());
}
public static List nullToEmpty(@Nullable List list) {
return nullToDefault(list, emptyList());
}
public static Map nullToEmpty(@Nullable Map map) {
return nullToDefault(map, emptyMap());
}
public static Collection nullToEmpty(@Nullable Collection collection) {
return collection != null ? collection : emptyList();
}
public static Iterable nullToEmpty(@Nullable Iterable iterable) {
return nullToDefault(iterable, emptyList());
}
public static Iterator nullToEmpty(@Nullable Iterator iterator) {
return nullToDefault(iterator, emptyIterator());
}
public static T nullToDefault(@Nullable T value, T defaultValue) {
return value != null ? value : defaultValue;
}
public static T nullToSupplier(@Nullable T value, Supplier defaultValue) {
return value != null ? value : defaultValue.get();
}
@NotNull
public static T nullToException(@Nullable T reference, Supplier exceptionSupplier) throws E {
if (reference != null) {
return reference;
}
throw exceptionSupplier.get();
}
public static int deepHashCode(@Nullable Object value) {
if (value == null) return 0;
if (!value.getClass().isArray()) return value.hashCode();
if (value instanceof Object[]) return Arrays.deepHashCode((Object[]) value);
if (value instanceof byte[]) return Arrays.hashCode((byte[]) value);
if (value instanceof short[]) return Arrays.hashCode((short[]) value);
if (value instanceof int[]) return Arrays.hashCode((int[]) value);
if (value instanceof long[]) return Arrays.hashCode((long[]) value);
if (value instanceof float[]) return Arrays.hashCode((float[]) value);
if (value instanceof double[]) return Arrays.hashCode((double[]) value);
if (value instanceof boolean[]) return Arrays.hashCode((boolean[]) value);
if (value instanceof char[]) return Arrays.hashCode((char[]) value);
throw new AssertionError();
}
public static boolean arraysEquals(
byte[] array1, int pos1, int len1,
byte[] array2, int pos2, int len2) {
if (len1 != len2) return false;
for (int i = 0; i < len1; i++) {
if (array1[pos1 + i] != array2[pos2 + i]) {
return false;
}
}
return true;
}
private static byte[] loadResource(@NotNull InputStream stream) throws IOException {
// reading file as resource
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[4096];
int size;
while ((size = stream.read(buffer)) != -1) {
out.write(buffer, 0, size);
}
return out.toByteArray();
} finally {
stream.close();
}
}
public static byte[] loadResource(Path path) throws IOException {
return loadResource(path.toString());
}
public static byte[] loadResource(String name) throws IOException {
return loadResource(checkNotNull(Thread.currentThread().getContextClassLoader().getResourceAsStream(name)));
}
public static InetSocketAddress parseInetSocketAddress(String addressAndPort) throws MalformedDataException {
int portPos = addressAndPort.lastIndexOf(':');
if (portPos == -1) {
try {
return new InetSocketAddress(Integer.parseInt(addressAndPort));
} catch (NumberFormatException nfe) {
throw new MalformedDataException(nfe);
}
}
String addressStr = addressAndPort.substring(0, portPos);
String portStr = addressAndPort.substring(portPos + 1);
int port;
try {
port = Integer.parseInt(portStr);
} catch (NumberFormatException nfe) {
throw new MalformedDataException(nfe);
}
if (port <= 0 || port >= 65536) {
throw new MalformedDataException("Invalid address. Port is not in range (0, 65536) " + addressStr);
}
if ("*".equals(addressStr)) {
return new InetSocketAddress(port);
}
try {
InetAddress address = InetAddress.getByName(addressStr);
return new InetSocketAddress(address, port);
} catch (UnknownHostException e) {
throw new MalformedDataException(e);
}
}
@Nullable
@Contract("_, _ -> null")
public static V nullify(@Nullable V value, @NotNull Runnable action) {
if (value != null) {
action.run();
}
return null;
}
@Nullable
@Contract("_, _ -> null")
public static V nullify(@Nullable V value, @NotNull Consumer<@NotNull ? super V> action) {
if (value != null) {
action.accept(value);
}
return null;
}
@Nullable
@Contract("_, _, _ -> null")
public static V nullify(@Nullable V value, @NotNull BiConsumer<@NotNull ? super V, A> action, A actionArg) {
if (value != null) {
action.accept(value, actionArg);
}
return null;
}
}
