aswb/src/com/google/idea/blaze/android/resources/AndroidResourceClassFinder.java

/*
 * Copyright 2016 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.idea.blaze.android.resources;

import com.google.common.base.Strings;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElementFinder;
import com.intellij.psi.PsiPackage;
import com.intellij.psi.search.GlobalSearchScope;
import java.util.List;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/** Provides dynamic Android Resource classes (class R {...} ). */
public class AndroidResourceClassFinder extends PsiElementFinder {
  static final String INTERNAL_R_CLASS_SHORTNAME = ".R";
  private final Project project;

  public AndroidResourceClassFinder(@NotNull Project project) {
    this.project = project;
  }

  @Nullable
  @Override
  public PsiClass findClass(@NotNull String qualifiedName, @NotNull GlobalSearchScope scope) {
    PsiClass[] result = findClasses(qualifiedName, scope);
    return result.length > 0 ? result[0] : null;
  }

  @NotNull
  @Override
  public PsiClass[] getClasses(@NotNull PsiPackage psiPackage, @NotNull GlobalSearchScope scope) {
    String targetPackageName = psiPackage.getQualifiedName();
    if (Strings.isNullOrEmpty(targetPackageName)) {
      return PsiClass.EMPTY_ARRAY;
    }
    return findClasses(targetPackageName + INTERNAL_R_CLASS_SHORTNAME, scope);
  }

  @NotNull
  @Override
  public PsiClass[] findClasses(@NotNull String qualifiedName, @NotNull GlobalSearchScope scope) {
    if (!qualifiedName.endsWith(INTERNAL_R_CLASS_SHORTNAME)) {
      return PsiClass.EMPTY_ARRAY;
    }
    LightResourceClassService rClassService = LightResourceClassService.getInstance(project);
    List<PsiClass> result = rClassService.getLightRClasses(qualifiedName, scope);
    return result.toArray(new PsiClass[result.size()]);
  }
}