/*
 * Copyright 2000-2015 JetBrains s.r.o.
 *
 * 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.intellij.ide.navigationToolbar;

import com.intellij.openapi.extensions.ExtensionPointName;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiElement;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Collection;

/**
 * The interface has a default implementation ({@link DefaultNavBarExtension}) which is normally registered as last.
 * That means that custom implementations are called before the default one - with the exception of {@link #adjustElement(PsiElement)}
 * method, for which the order is reverse.
 *
 * @author anna
 * @since 04-Feb-2008
 */
public interface NavBarModelExtension {
  ExtensionPointName<NavBarModelExtension> EP_NAME = ExtensionPointName.create("com.intellij.navbar");

  @Nullable
  String getPresentableText(Object object);

  @Nullable
  PsiElement getParent(PsiElement psiElement);

  @Nullable
  PsiElement adjustElement(PsiElement psiElement);

  @NotNull
  Collection<VirtualFile> additionalRoots(Project project);
}
