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Core components supporting the Micronaut Framework
/*
* Copyright 2017-2020 original authors
*
* 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
*
* https://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.micronaut.annotation.processing.test;
import javax.annotation.processing.Filer;
import javax.lang.model.element.Element;
import javax.tools.*;
import javax.tools.JavaFileObject.Kind;
import java.io.*;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Optional;
import java.util.function.BiFunction;
import java.util.function.Function;
/**
* A file manager implementation that stores all output in memory.
*
* NOTE: Forked from Google Compile Testing Project
*
* @author Gregory Kick
*/
@SuppressWarnings("all")
final class InMemoryJavaFileManager extends ForwardingJavaFileManager implements Filer {
private final Map inMemoryFileObjects = new LinkedHashMap<>();
InMemoryJavaFileManager(JavaFileManager fileManager) {
super(fileManager);
}
private static URI uriForFileObject(Location location, String packageName, String relativeName) {
StringBuilder uri = new StringBuilder("mem:///").append(location.getName()).append('/');
if (!packageName.isEmpty()) {
uri.append(packageName.replace('.', '/')).append('/');
}
uri.append(relativeName);
return URI.create(uri.toString());
}
private static URI uriForJavaFileObject(Location location, String className, Kind kind) {
return URI.create(
"mem:///" + location.getName() + '/' + className.replace('.', '/') + kind.extension);
}
/**
* Obtain the path for a file.
* @param name The name
* @return The path
*/
public String getMetaInfPath(String name) {
return uriForFileObject(StandardLocation.CLASS_OUTPUT, "META-INF", name).getPath();
}
@Override
public boolean isSameFile(FileObject a, FileObject b) {
/* This check is less strict than what is typically done by the normal compiler file managers
* (e.g. JavacFileManager), but is actually the moral equivalent of what most of the
* implementations do anyway. We use this check rather than just delegating to the compiler's
* file manager because file objects for tests generally cause IllegalArgumentExceptions. */
return a.toUri().equals(b.toUri());
}
@Override
public FileObject getFileForInput(Location location, String packageName,
String relativeName) throws IOException {
if (location.isOutputLocation()) {
final URI uri = uriForFileObject(location, packageName, relativeName);
return inMemoryFileObjects.computeIfPresent(uri, new BiFunction() {
@Override
public JavaFileObject apply(URI uri, JavaFileObject javaFileObject) {
return new InMemoryJavaFileManager.InMemoryJavaFileObject(uri);
}
});
} else {
return super.getFileForInput(location, packageName, relativeName);
}
}
@Override
public JavaFileObject getJavaFileForInput(Location location, String className, Kind kind)
throws IOException {
if (location.isOutputLocation()) {
final URI uri = uriForJavaFileObject(location, className, kind);
return inMemoryFileObjects.computeIfPresent(uri, new BiFunction() {
@Override
public JavaFileObject apply(URI uri, JavaFileObject javaFileObject) {
return new InMemoryJavaFileManager.InMemoryJavaFileObject(uri);
}
});
} else {
return super.getJavaFileForInput(location, className, kind);
}
}
@Override
public FileObject getFileForOutput(Location location, String packageName,
String relativeName, FileObject sibling) throws IOException {
URI uri = uriForFileObject(location, packageName, relativeName);
return inMemoryFileObjects.computeIfAbsent(uri, new Function() {
@Override
public JavaFileObject apply(URI uri) {
return new InMemoryJavaFileManager.InMemoryJavaFileObject(uri);
}
});
}
@Override
public JavaFileObject getJavaFileForOutput(Location location, String className, final Kind kind,
FileObject sibling) throws IOException {
URI uri = uriForJavaFileObject(location, className, kind);
return inMemoryFileObjects.computeIfAbsent(uri, new Function() {
@Override
public JavaFileObject apply(URI uri) {
return new InMemoryJavaFileManager.InMemoryJavaFileObject(uri);
}
});
}
Iterable getOutputFiles() {
return Collections.unmodifiableCollection(inMemoryFileObjects.values());
}
@Override
public JavaFileObject createSourceFile(CharSequence name, Element... originatingElements) throws IOException {
return getJavaFileForOutput(StandardLocation.SOURCE_OUTPUT, name.toString(), Kind.SOURCE, null);
}
@Override
public JavaFileObject createClassFile(CharSequence name, Element... originatingElements) throws IOException {
return getJavaFileForOutput(StandardLocation.CLASS_OUTPUT, name.toString(), Kind.SOURCE, null);
}
@Override
public FileObject createResource(Location location, CharSequence pkg, CharSequence relativeName, Element... originatingElements) throws IOException {
return getFileForOutput(StandardLocation.CLASS_OUTPUT, pkg.toString(), relativeName.toString(), null);
}
@Override
public FileObject getResource(Location location, CharSequence pkg, CharSequence relativeName) throws IOException {
return getFileForInput(StandardLocation.SOURCE_PATH, pkg.toString(), relativeName.toString());
}
private static final class InMemoryJavaFileObject extends SimpleJavaFileObject
implements JavaFileObject {
private long lastModified = 0L;
private Optional data = Optional.empty();
InMemoryJavaFileObject(URI uri) {
super(uri, deduceKind(uri));
}
@Override
public InputStream openInputStream() throws IOException {
if (data.isPresent()) {
return new ByteArrayInputStream(data.get());
} else {
throw new FileNotFoundException();
}
}
@Override
public OutputStream openOutputStream() throws IOException {
return new ByteArrayOutputStream() {
@Override
public void close() throws IOException {
final byte[] bytes = toByteArray();
data = Optional.of(bytes);
super.close();
}
};
}
@Override
public Reader openReader(boolean ignoreEncodingErrors) throws IOException {
return new InputStreamReader(openInputStream(), StandardCharsets.UTF_8);
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors)
throws IOException {
if (data.isPresent()) {
return new String(data.get(), StandardCharsets.UTF_8);
} else {
throw new FileNotFoundException();
}
}
@Override
public Writer openWriter() throws IOException {
return new StringWriter() {
@Override
public void close() throws IOException {
super.close();
final byte[] bytes = toString().getBytes(StandardCharsets.UTF_8);
data = Optional.of(bytes);
lastModified = System.currentTimeMillis();
}
};
}
@Override
public long getLastModified() {
return lastModified;
}
@Override
public boolean delete() {
this.data = Optional.empty();
this.lastModified = 0L;
return true;
}
@Override
public String toString() {
return "InMemoryJavaFileObject{" +
"uri=" + uri +
", kind=" + kind +
'}';
}
}
static Kind deduceKind(URI uri) {
String path = uri.getPath();
for (Kind kind : Kind.values()) {
if (path.endsWith(kind.extension)) {
return kind;
}
}
return Kind.OTHER;
}
}