/*
 * Copyright 2000-2016 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.openapi.vcs.changes;

import com.intellij.codeInsight.completion.CompletionContributor;
import com.intellij.codeInsight.completion.CompletionParameters;
import com.intellij.codeInsight.completion.CompletionResultSet;
import com.intellij.codeInsight.completion.PlainPrefixMatcher;
import com.intellij.codeInsight.lookup.LookupElementBuilder;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.ui.ComboBox;
import com.intellij.openapi.util.Key;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import org.jetbrains.annotations.NotNull;

public class ChangeListCompletionContributor extends CompletionContributor implements DumbAware {
  public static final Key<ComboBox<ChangeList>> COMBO_BOX_KEY = Key.create("CHANGELIST_COMBO_BOX");

  @Override
  public void fillCompletionVariants(@NotNull final CompletionParameters parameters, @NotNull final CompletionResultSet result) {
    final PsiFile file = parameters.getOriginalFile();
    final Document document = PsiDocumentManager.getInstance(file.getProject()).getDocument(file);
    if (document == null) return;
    ComboBox comboBox = document.getUserData(COMBO_BOX_KEY);
    if (comboBox == null) return;
    final CompletionResultSet resultSet = result.withPrefixMatcher(new PlainPrefixMatcher(document.getText()));
    for (int i = 0; i < comboBox.getItemCount(); i++) {
      resultSet.addElement(LookupElementBuilder.create(comboBox.getItemAt(i)));
    }
  }

  @Override
  public boolean invokeAutoPopup(@NotNull PsiElement position, char typeChar) {
    return true;
  }
}


@@ -1762,16 +1762,22 @@
 t()).get
+Cached
 Document

change getDoc to getCachedDoc to avoid document creation