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Fixes #2330 PiperOrigin-RevId: 373683703
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check_api/src/main/java/com/google/errorprone/util/ErrorProneScope.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| /* | ||
| * Copyright 2021 The Error Prone 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 | ||
| * | ||
| * 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 com.google.errorprone.util; | ||
|
|
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| import static com.google.common.base.Preconditions.checkState; | ||
|
|
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| import com.sun.tools.javac.code.Scope; | ||
| import com.sun.tools.javac.code.Scope.LookupKind; | ||
| import com.sun.tools.javac.code.Symbol; | ||
| import com.sun.tools.javac.util.Name; | ||
| import java.lang.reflect.InvocationHandler; | ||
| import java.lang.reflect.Method; | ||
| import java.lang.reflect.Proxy; | ||
| import java.util.Arrays; | ||
| import java.util.function.Predicate; | ||
|
|
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| /** A compatibility wrapper around {@link com.sun.tools.javac.util.Filter} */ | ||
| public final class ErrorProneScope { | ||
|
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| @SuppressWarnings("unchecked") // reflection | ||
| public Iterable<Symbol> getSymbolsByName(Name name, Predicate<Symbol> predicate) { | ||
| return (Iterable<Symbol>) invoke(getSymbolsByName, name, maybeAsFilter(predicate)); | ||
| } | ||
|
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| @SuppressWarnings("unchecked") // reflection | ||
| public Iterable<Symbol> getSymbolsByName( | ||
| Name name, Predicate<Symbol> predicate, LookupKind lookupKind) { | ||
| return (Iterable<Symbol>) | ||
| invoke(getSymbolsByNameLookupKind, name, maybeAsFilter(predicate), lookupKind); | ||
| } | ||
|
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| @SuppressWarnings("unchecked") // reflection | ||
| public Iterable<Symbol> getSymbols(Predicate<Symbol> predicate) { | ||
| return (Iterable<Symbol>) invoke(getSymbols, maybeAsFilter(predicate)); | ||
| } | ||
|
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| public boolean anyMatch(Predicate<Symbol> predicate) { | ||
| return (boolean) invoke(anyMatch, maybeAsFilter(predicate)); | ||
| } | ||
|
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| private static final Class<?> filterClass = getFilterClass(); | ||
|
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| private static Class<?> getFilterClass() { | ||
| try { | ||
| return Class.forName("com.sun.tools.javac.util.Filter"); | ||
| } catch (ClassNotFoundException e) { | ||
| return null; | ||
| } | ||
| } | ||
|
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| private static final Method anyMatch = getImpl("anyMatch", Predicate.class); | ||
|
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| private static final Method getSymbolsByName = | ||
| getImpl("getSymbolsByName", Name.class, Predicate.class); | ||
|
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| private static final Method getSymbolsByNameLookupKind = | ||
| getImpl("getSymbolsByName", Name.class, Predicate.class, LookupKind.class); | ||
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| private static final Method getSymbols = getImpl("getSymbols", Predicate.class); | ||
|
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| private static Method getImpl(String name, Class<?>... parameters) { | ||
| return filterClass != null | ||
| ? getMethodOrDie( | ||
| Scope.class, | ||
| name, | ||
| Arrays.stream(parameters) | ||
| .map(p -> p.equals(Predicate.class) ? filterClass : p) | ||
| .toArray(Class<?>[]::new)) | ||
| : getMethodOrDie(Scope.class, name, parameters); | ||
| } | ||
|
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| private final Scope scope; | ||
|
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| ErrorProneScope(Scope scope) { | ||
| this.scope = scope; | ||
| } | ||
|
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| private Object invoke(Method method, Object... args) { | ||
| try { | ||
| return method.invoke(scope, args); | ||
| } catch (ReflectiveOperationException e) { | ||
| throw new LinkageError(e.getMessage(), e); | ||
| } | ||
| } | ||
|
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| private Object maybeAsFilter(Predicate<Symbol> predicate) { | ||
| if (filterClass == null) { | ||
| return predicate; | ||
| } | ||
| return Proxy.newProxyInstance( | ||
| getClass().getClassLoader(), | ||
| new Class<?>[] {filterClass}, | ||
| new InvocationHandler() { | ||
| @Override | ||
| public Object invoke(Object proxy, Method method, Object[] args) { | ||
| checkState(method.getName().equals("accepts")); | ||
| return predicate.test((Symbol) args[0]); | ||
| } | ||
| }); | ||
| } | ||
|
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| private static Method getMethodOrDie(Class<?> clazz, String name, Class<?>... parameters) { | ||
| try { | ||
| return clazz.getMethod(name, parameters); | ||
| } catch (NoSuchMethodException e) { | ||
| throw new LinkageError(e.getMessage(), e); | ||
| } | ||
| } | ||
| } |
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