// Copyright 2018 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 org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Handle;
import org.objectweb.asm.commons.ClassRemapper;
import org.objectweb.asm.commons.Remapper;

/**
 * A visitor that renames some type names and only when the owner is also renamed.
 */
class CorePackageRenamer extends ClassRemapper {

  public CorePackageRenamer(ClassVisitor cv, CoreLibrarySupport support) {
    super(cv, new CorePackageRemapper(support));
  }

  private static final class CorePackageRemapper extends Remapper {
    private final CoreLibrarySupport support;

    private CorePackageRemapper(CoreLibrarySupport support) {
      this.support = support;
    }

    public boolean isRenamed(String owner) {
      return support.isRenamedCoreLibrary(owner);
    }

    @Override
    public String map(String typeName) {
      return isRenamed(typeName) ? support.renameCoreLibrary(typeName) : typeName;
    }

    @Override
    public Object mapValue(Object value) {
      if (value instanceof Handle && !isRenamed(((Handle) value).getOwner())) {
        return value;
      }
      return super.mapValue(value);
    }
  }
}