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OS.java
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/*
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*/
package org.opensearch.gradle;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.function.Supplier;
public enum OS {
FREEBSD,
LINUX,
MAC,
WINDOWS;
public static OS current() {
String os = System.getProperty("os.name", "");
if (os.startsWith("FreeBSD")) {
return OS.FREEBSD;
}
if (os.startsWith("Linux") || os.startsWith("LINUX")) {
return OS.LINUX;
}
if (os.startsWith("Mac")) {
return OS.MAC;
}
if (os.startsWith("Windows")) {
return OS.WINDOWS;
}
throw new IllegalStateException("Can't determine OS from: " + os);
}
public static class Conditional<T> {
private final Map<OS, Supplier<T>> conditions = new HashMap<>();
public Conditional<T> onLinux(Supplier<T> supplier) {
conditions.put(LINUX, supplier);
return this;
}
public Conditional<T> onFreeBSD(Supplier<T> supplier) {
conditions.put(FREEBSD, supplier);
return this;
}
public Conditional<T> onMac(Supplier<T> supplier) {
conditions.put(MAC, supplier);
return this;
}
public Conditional<T> onUnix(Supplier<T> supplier) {
conditions.put(FREEBSD, supplier);
conditions.put(LINUX, supplier);
conditions.put(MAC, supplier);
return this;
}
public Conditional<T> onWindows(Supplier<T> supplier) {
conditions.put(WINDOWS, supplier);
return this;
}
public T supply() {
HashSet<OS> missingOS = new HashSet<>(Arrays.asList(OS.values()));
missingOS.removeAll(conditions.keySet());
if (missingOS.isEmpty() == false) {
throw new IllegalArgumentException("No condition specified for " + missingOS);
}
return conditions.get(OS.current()).get();
}
}
public static <T> Conditional<T> conditional() {
return new Conditional<>();
}
public static Conditional<String> conditionalString() {
return conditional();
}
}