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[#7385] Upgrade jOOR dependency to 0.9.8
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/* | ||
* 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 org.jooq.tools.reflect; | ||
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import java.io.ByteArrayOutputStream; | ||
import java.io.OutputStream; | ||
import java.lang.invoke.MethodHandles; | ||
import java.lang.invoke.MethodHandles.Lookup; | ||
import java.net.URI; | ||
import java.util.ArrayList; | ||
import java.util.List; | ||
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import javax.tools.FileObject; | ||
import javax.tools.ForwardingJavaFileManager; | ||
import javax.tools.JavaCompiler; | ||
import javax.tools.JavaFileManager; | ||
import javax.tools.SimpleJavaFileObject; | ||
import javax.tools.StandardJavaFileManager; | ||
import javax.tools.ToolProvider; | ||
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// import static java.lang.StackWalker.Option.RETAIN_CLASS_REFERENCE; | ||
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/** | ||
* A utility that simplifies in-memory compilation of new classes. | ||
* | ||
* @author Lukas Eder | ||
*/ | ||
class Compile { | ||
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static Class<?> compile(String className, String content) { | ||
Lookup lookup = MethodHandles.lookup(); | ||
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try { | ||
return lookup.lookupClass().getClassLoader().loadClass(className); | ||
} | ||
catch (ClassNotFoundException ignore) { | ||
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); | ||
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try { | ||
ClassFileManager fileManager = new ClassFileManager(compiler.getStandardFileManager(null, null, null)); | ||
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List<CharSequenceJavaFileObject> files = new ArrayList<CharSequenceJavaFileObject>(); | ||
files.add(new CharSequenceJavaFileObject(className, content)); | ||
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compiler.getTask(null, fileManager, null, null, null, files).call(); | ||
Class<?> result = null; | ||
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// This works if we have private-access to the interfaces in the class hierarchy | ||
// if (Reflect.CACHED_LOOKUP_CONSTRUCTOR != null) { | ||
ClassLoader cl = lookup.lookupClass().getClassLoader(); | ||
byte[] b = fileManager.o.getBytes(); | ||
result = Reflect.on(cl).call("defineClass", className, b, 0, b.length).get(); | ||
// } | ||
/* [java-9] */ | ||
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// Lookup.defineClass() has only been introduced in Java 9. It is | ||
// required to get private-access to interfaces in the class hierarchy | ||
// else { | ||
// | ||
// // This method is called by client code from two levels up the current stack frame | ||
// // We need a private-access lookup from the class in that stack frame in order to get | ||
// // private-access to any local interfaces at that location. | ||
// Class<?> caller = StackWalker | ||
// .getInstance(RETAIN_CLASS_REFERENCE) | ||
// .walk(s -> s | ||
// .skip(2) | ||
// .findFirst() | ||
// .get() | ||
// .getDeclaringClass()); | ||
// | ||
// // If the compiled class is in the same package as the caller class, then | ||
// // we can use the private-access Lookup of the caller class | ||
// if (className.startsWith(caller.getPackageName() + ".")) { | ||
// result = MethodHandles | ||
// .privateLookupIn(caller, lookup) | ||
// .defineClass(fileManager.o.getBytes()); | ||
// } | ||
// | ||
// // Otherwise, use an arbitrary class loader. This approach doesn't allow for | ||
// // loading private-access interfaces in the compiled class's type hierarchy | ||
// else { | ||
// result = new ClassLoader() { | ||
// @Override | ||
// protected Class<?> findClass(String name) throws ClassNotFoundException { | ||
// byte[] b = fileManager.o.getBytes(); | ||
// return defineClass(className, b, 0, b.length); | ||
// } | ||
// }.loadClass(className); | ||
// } | ||
// } | ||
/* [/java-9] */ | ||
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return result; | ||
} | ||
catch (Exception e) { | ||
throw new ReflectException("Error while compiling " + className, e); | ||
} | ||
} | ||
} | ||
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static final class JavaFileObject extends SimpleJavaFileObject { | ||
final ByteArrayOutputStream os = new ByteArrayOutputStream(); | ||
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JavaFileObject(String name, JavaFileObject.Kind kind) { | ||
super(URI.create("string:///" + name.replace('.', '/') + kind.extension), kind); | ||
} | ||
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byte[] getBytes() { | ||
return os.toByteArray(); | ||
} | ||
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@Override | ||
public OutputStream openOutputStream() { | ||
return os; | ||
} | ||
} | ||
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static final class ClassFileManager extends ForwardingJavaFileManager<StandardJavaFileManager> { | ||
JavaFileObject o; | ||
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ClassFileManager(StandardJavaFileManager standardManager) { | ||
super(standardManager); | ||
} | ||
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@Override | ||
public JavaFileObject getJavaFileForOutput( | ||
JavaFileManager.Location location, | ||
String className, | ||
JavaFileObject.Kind kind, | ||
FileObject sibling | ||
) { | ||
return o = new JavaFileObject(className, kind); | ||
} | ||
} | ||
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static final class CharSequenceJavaFileObject extends SimpleJavaFileObject { | ||
final CharSequence content; | ||
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public CharSequenceJavaFileObject(String className, CharSequence content) { | ||
super(URI.create("string:///" + className.replace('.', '/') + JavaFileObject.Kind.SOURCE.extension), JavaFileObject.Kind.SOURCE); | ||
this.content = content; | ||
} | ||
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@Override | ||
public CharSequence getCharContent(boolean ignoreEncodingErrors) { | ||
return content; | ||
} | ||
} | ||
} | ||
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