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/*
* Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* SOFTWARE.
*/
package org.graalvm.home;
import java.nio.file.Path;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.ServiceLoader;
import org.graalvm.home.impl.DefaultHomeFinder;
import org.graalvm.nativeimage.ImageInfo;
import org.graalvm.nativeimage.ImageSingletons;
import org.graalvm.nativeimage.hosted.Feature;
/**
* A utility class to find various paths of the running GraalVM, as well as the version.
*
* Use {@link HomeFinder#getInstance()} to get the singleton instance.
*
* @since 19.3
*/
public abstract class HomeFinder {
/**
* @since 19.3
*/
public HomeFinder() {
}
/**
* @return the GraalVM home folder if inside GraalVM or {@code null} otherwise.
* @since 19.3
*/
public abstract Path getHomeFolder();
/**
* @return the GraalVM version or {@code "snapshot"} if unknown.
* @since 19.3
*/
public abstract String getVersion();
/**
* @return a Map of language ids to their home path.
* @since 19.3
*/
public abstract Map getLanguageHomes();
/**
* @return a Map of tool ids to their home path.
* @since 19.3
*/
public abstract Map getToolHomes();
/**
* @return the HomeFinder instance by using a ServiceLoader.
* @throws IllegalStateException if no implementation could be found.
* @since 19.3
*/
public static HomeFinder getInstance() {
if (ImageInfo.inImageCode() && ImageSingletons.contains(HomeFinder.class)) {
return ImageSingletons.lookup(HomeFinder.class);
}
Class lookupClass = HomeFinder.class;
ModuleLayer moduleLayer = lookupClass.getModule().getLayer();
Iterable services;
if (moduleLayer != null) {
services = ServiceLoader.load(moduleLayer, HomeFinder.class);
} else {
services = ServiceLoader.load(HomeFinder.class, lookupClass.getClassLoader());
}
Iterator iterator = services.iterator();
if (!iterator.hasNext()) {
services = ServiceLoader.load(HomeFinder.class);
iterator = services.iterator();
}
try {
return iterator.next();
} catch (NoSuchElementException e) {
throw new IllegalStateException("No implementation of " + HomeFinder.class.getName() + " could be found");
}
}
}
class HomeFinderFeature implements Feature {
public String getURL() {
return "https://github.com/oracle/graal/blob/master/sdk/src/org.graalvm.home/src/org/graalvm/home/HomeFinder.java";
}
public String getDescription() {
return "Finds GraalVM paths and its version number";
}
@Override
public void afterRegistration(AfterRegistrationAccess access) {
ImageSingletons.add(HomeFinder.class, new DefaultHomeFinder());
}
}
