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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.android.desugar;
import static com.google.common.base.Preconditions.checkState;
import com.google.devtools.build.android.desugar.io.BitFlags;
import java.util.HashMap;
import javax.annotation.Nullable;
import org.objectweb.asm.ClassReader;
/**
* Simple memoizer for whether types are classes or interfaces.
*/
class ClassVsInterface {
/** Map from internal names to whether they are an interface ({@code false} thus means class). */
private final HashMap<String, Boolean> known = new HashMap<>();
private final ClassReaderFactory classpath;
public ClassVsInterface(ClassReaderFactory classpath) {
this.classpath = classpath;
}
public ClassVsInterface addKnownClass(@Nullable String internalName) {
if (internalName != null) {
Boolean previous = known.put(internalName, false);
checkState(previous == null || !previous, "Already recorded as interface: %s", internalName);
}
return this;
}
public ClassVsInterface addKnownInterfaces(String... internalNames) {
for (String internalName : internalNames) {
Boolean previous = known.put(internalName, true);
checkState(previous == null || previous, "Already recorded as class: %s", internalName);
}
return this;
}
public boolean isOuterInterface(String outerName, String innerName) {
Boolean result = known.get(outerName);
if (result == null) {
// We could just load the outer class here, but this tolerates incomplete classpaths better.
// Note the outer class should be in the Jar we're desugaring, so it should always be there.
ClassReader outerClass = classpath.readIfKnown(outerName);
if (outerClass == null) {
System.err.printf("WARNING: Couldn't find outer class %s of %s%n", outerName, innerName);
// TODO(b/79155927): Make this an error when sources of this problem are fixed.
result = false; // assume it's a class if we can't find it (b/79155927)
} else {
result = BitFlags.isInterface(outerClass.getAccess());
}
known.put(outerName, result);
}
return result;
}
}
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