// Copyright 2012 Google Inc. 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.collide.client.code.autocomplete;

import com.google.collide.client.editor.selection.SelectionModel;
import com.google.collide.codemirror2.SyntaxType;
import com.google.common.annotations.VisibleForTesting;

/**
 * Implementation that do not propose completions.
 */
public class NoneAutocompleter extends LanguageSpecificAutocompleter {

  private static NoneAutocompleter instance;

  public static NoneAutocompleter getInstance() {
    if (instance == null) {
      instance = new NoneAutocompleter(SyntaxType.NONE);
    }
    return instance;
  }

  @VisibleForTesting
  NoneAutocompleter(SyntaxType mode) {
    super(mode);
  }

  @Override
  public AutocompleteResult computeAutocompletionResult(
      AutocompleteProposals.ProposalWithContext proposal) {
    throw new IllegalStateException("This method should not be invoked");
  }

  @Override
  public AutocompleteProposals findAutocompletions(SelectionModel selection,
      SignalEventEssence trigger) {
    return AutocompleteProposals.EMPTY;
  }

  @Override
  public void cleanup() {
    // Do nothing.
  }
}