LexicalNodesFilter.java

/*
 * Copyright 2000-2017 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.structuralsearch.impl.matcher.filters;

import com.intellij.dupLocator.util.NodeFilter;
import com.intellij.psi.PsiElement;
import com.intellij.structuralsearch.StructuralSearchProfile;
import com.intellij.structuralsearch.StructuralSearchUtil;

/**
 * Filter for lexical nodes
 */
public final class LexicalNodesFilter implements NodeFilter {

  LexicalNodesFilter() {}

  public static NodeFilter getInstance() {
    return NodeFilterHolder.INSTANCE;
  }

  private static class NodeFilterHolder {
    static final NodeFilter INSTANCE = new LexicalNodesFilter();
  }

  @Override
  public boolean accepts(PsiElement element) {
    if (element == null) return false;
    final StructuralSearchProfile profile = StructuralSearchUtil.getProfileByPsiElement(element);
    return profile != null && profile.getLexicalNodesFilter().accepts(element);
  }
}