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Access Javac API from a standalone Javac jar insteadof the JDK
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79
org.eclipse.jdt.core.javac/src/org/eclipse/jdt/core/dom/JavacPatch.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| /******************************************************************************* | ||
| * Copyright (c) 2024 Microsoft Corporation and others. | ||
| * All rights reserved. This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Public License 2.0 | ||
| * which accompanies this distribution, and is available at | ||
| * https://www.eclipse.org/legal/epl-2.0/ | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| * | ||
| * Contributors: | ||
| * Microsoft Corporation - initial API and implementation | ||
| *******************************************************************************/ | ||
|
|
||
| package org.eclipse.jdt.core.dom; | ||
|
|
||
| import java.io.IOException; | ||
| import java.lang.ref.Reference; | ||
| import java.lang.ref.SoftReference; | ||
| import java.lang.reflect.Field; | ||
| import java.net.URISyntaxException; | ||
| import java.net.URL; | ||
| import java.nio.file.FileSystem; | ||
| import java.nio.file.FileSystems; | ||
| import java.nio.file.Path; | ||
| import java.nio.file.Paths; | ||
| import java.util.Enumeration; | ||
|
|
||
| import org.eclipse.core.runtime.FileLocator; | ||
| import org.eclipse.core.runtime.URIUtil; | ||
|
|
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| import nbjavac.VMWrapper; | ||
|
|
||
| public class JavacPatch { | ||
| private static Reference<Path> cachedCtSym = new SoftReference<>(null); | ||
|
|
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| public static void loadVMWrapperPatch() { | ||
| try { | ||
| Field cachedCtSymField = VMWrapper.class.getDeclaredField("cachedCtSym"); | ||
| cachedCtSymField.setAccessible(true); | ||
| if (cachedCtSym.get() == null) { | ||
| cachedCtSym = new SoftReference<>(findCtSym()); | ||
| } | ||
| cachedCtSymField.set(null, cachedCtSym); | ||
| } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
|
|
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| private static Path findCtSym() { | ||
| Path obj = cachedCtSym.get(); | ||
| if (obj instanceof Path) { | ||
| return obj; | ||
| } | ||
| try { | ||
| ClassLoader loader = VMWrapper.class.getClassLoader(); | ||
| if (loader == null) { | ||
| loader = ClassLoader.getSystemClassLoader(); | ||
| } | ||
| Enumeration<URL> en = loader.getResources("META-INF/services/com.sun.tools.javac.platform.PlatformProvider"); | ||
| URL res = en.hasMoreElements() ? en.nextElement() : null; | ||
| if (res == null) { | ||
| throw new IllegalStateException("Cannot find ct.sym"); | ||
| } | ||
| URL jar = FileLocator.resolve(res); | ||
| String jarFile = jar.getFile(); | ||
| int idx = jarFile.indexOf('!'); | ||
| if (idx >= 0) { | ||
| jarFile = jarFile.substring(0, idx); | ||
| } | ||
| Path path = Paths.get(URIUtil.fromString(jarFile)); | ||
| FileSystem fs = FileSystems.newFileSystem(path, (ClassLoader) null); | ||
| Path ctSym = fs.getPath("META-INF", "ct.sym"); | ||
| cachedCtSym = new SoftReference<>(ctSym); | ||
| return ctSym; | ||
| } catch (IOException | URISyntaxException ex) { | ||
| throw new IllegalStateException(ex); | ||
| } | ||
| } | ||
| } |
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