FilteringSelectionMenuProvider.java

/*
 * Copyright 2003-2016 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 jetbrains.mps.nodeEditor.assist;

import jetbrains.mps.openapi.editor.menus.transformation.TransformationMenuItem;
import jetbrains.mps.openapi.editor.selection.Selection;
import org.jetbrains.annotations.NotNull;

import java.util.List;
import java.util.function.Function;

/**
 * A wrapper that passes the results of the wrapped menu provider to a {@link Function} and returns the function result.
 */
class FilteringSelectionMenuProvider implements SelectionMenuProvider {
  private final SelectionMenuProvider mySource;
  private final Function<List<TransformationMenuItem>, List<TransformationMenuItem>> myFilter;

  FilteringSelectionMenuProvider(SelectionMenuProvider source, Function<List<TransformationMenuItem>, List<TransformationMenuItem>> filter) {
    mySource = source;
    myFilter = filter;
  }

  @NotNull
  @Override
  public List<TransformationMenuItem> getMenuItems(@NotNull Selection selection) {
    return myFilter.apply(mySource.getMenuItems(selection));
  }
}