// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package com.intellij.psi;

import com.intellij.openapi.components.ServiceManager;
import com.intellij.openapi.util.Key;
import org.jetbrains.annotations.ApiStatus;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.List;

/**
 * @author Gregory.Shrago
 */
public abstract class PsiReferenceService {

  /**
   * @deprecated unused
   */
  @ApiStatus.ScheduledForRemoval(inVersion = "2020.1")
  @Deprecated
  public static final Key<Hints> HINTS = Key.create("HINTS");

  public static PsiReferenceService getService() {
    return ServiceManager.getService(PsiReferenceService.class);
  }

  /**
   * By default, return the same as {@link com.intellij.psi.PsiElement#getReferences()}.
   * For elements implementing {@link com.intellij.psi.ContributedReferenceHost} also run
   * the reference providers registered in {@link com.intellij.psi.PsiReferenceContributor}
   * extensions.
   * @param element PSI element to which the references will be bound
   * @param hints optional hints which are passed to {@link com.intellij.psi.PsiReferenceProvider#acceptsHints(PsiElement, com.intellij.psi.PsiReferenceService.Hints)} and
   * {@link com.intellij.psi.PsiReferenceProvider#acceptsTarget(PsiElement)} before the {@link com.intellij.patterns.ElementPattern} is matched, for performing
   * fail-fast checks in case the pattern takes long to match.
   * @return the references
   */
  @NotNull
  public abstract List<PsiReference> getReferences(@NotNull final PsiElement element, @NotNull final Hints hints);

  @NotNull
  public PsiReference[] getContributedReferences(@NotNull final PsiElement element) {
    final List<PsiReference> list = getReferences(element, Hints.NO_HINTS);
    return list.toArray(PsiReference.EMPTY_ARRAY);
  }


  public static class Hints {
    public static final Hints NO_HINTS = new Hints();

    @Nullable public final PsiElement target;
    @Nullable public final Integer offsetInElement;

    public Hints() {
      target = null;
      offsetInElement = null;
    }

    public Hints(@Nullable PsiElement target, @Nullable Integer offsetInElement) {
      this.target = target;
      this.offsetInElement = offsetInElement;
    }
  }
}

@@ -220,90 +220,8 @@
 er;%0A
-import com.intellij.openapi.util.Key;%0Aimport org.jetbrains.annotations.ApiStatus;%0A
 impo
@@ -409,176 +409,8 @@
  %7B%0A%0A
-  /**%0A   * @deprecated unused%0A   */%0A  @ApiStatus.ScheduledForRemoval(inVersion = %222020.1%22)%0A  @Deprecated%0A  public static final Key%3CHints%3E HINTS = Key.create(%22HINTS%22);%0A%0A
   pu

remove deprecated PsiReferenceService#HINTS