| /* |
| * Copyright 2000-2010 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.psi.util; |
| |
| import com.intellij.psi.PsiElement; |
| import com.intellij.psi.PsiRecursiveElementVisitor; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.List; |
| |
| /** |
| * @author Konstantin Bulenkov |
| */ |
| public class PsiFilter<T extends PsiElement> { |
| private final Class<T> filter; |
| public static final PsiFilter<?>[] EMPTY = {}; |
| |
| public PsiFilter(@NotNull Class<T> filter) { |
| this.filter = filter; |
| } |
| |
| public boolean accept(T element) { |
| return true; |
| } |
| |
| public final Class<T> getParentClass() { |
| return filter; |
| } |
| |
| public boolean areEquivalent(T e1, T e2) { |
| return e1.isEquivalentTo(e2); |
| } |
| |
| public Visitor<T> createVisitor(List<T> elements) { |
| return new Visitor<T>(this, elements); |
| } |
| |
| public static class Visitor<T extends PsiElement> extends PsiRecursiveElementVisitor { |
| private final PsiFilter<T> filter; |
| private final List<T> elements; |
| |
| protected Visitor(final PsiFilter<T> filter, final List<T> elements) { |
| this.filter = filter; |
| this.elements = elements; |
| } |
| |
| @Override |
| public void visitElement(PsiElement element) { |
| if (filter.getParentClass().isAssignableFrom(element.getClass())) { |
| final T e = (T)element; |
| if (filter.accept(e)) { |
| elements.add(e); |
| } |
| } |
| super.visitElement(element); |
| } |
| } |
| } |