| /* |
| * Copyright 2000-2014 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. |
| */ |
| |
| /* |
| * @author max |
| */ |
| package com.intellij.lang; |
| |
| import com.intellij.openapi.util.Key; |
| import com.intellij.openapi.util.KeyedExtensionCollector; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.util.List; |
| |
| public class LanguageExtension<T> extends KeyedExtensionCollector<T, Language> { |
| private final T myDefaultImplementation; |
| private final /* non static!!! */ Key<T> IN_LANGUAGE_CACHE; |
| |
| public LanguageExtension(@NonNls final String epName) { |
| this(epName, null); |
| } |
| |
| public LanguageExtension(@NonNls final String epName, @Nullable final T defaultImplementation) { |
| super(epName); |
| myDefaultImplementation = defaultImplementation; |
| IN_LANGUAGE_CACHE = Key.create("EXTENSIONS_IN_LANGUAGE_"+epName); |
| } |
| |
| @NotNull |
| @Override |
| protected String keyToString(@NotNull final Language key) { |
| return key.getID(); |
| } |
| |
| @SuppressWarnings("ConstantConditions") |
| public T forLanguage(@NotNull Language l) { |
| T cached = l.getUserData(IN_LANGUAGE_CACHE); |
| if (cached != null) return cached; |
| |
| List<T> extensions = forKey(l); |
| T result; |
| if (extensions.isEmpty()) { |
| Language base = l.getBaseLanguage(); |
| result = base == null ? myDefaultImplementation : forLanguage(base); |
| } |
| else { |
| result = extensions.get(0); |
| } |
| if (result == null) return null; |
| result = l.putUserDataIfAbsent(IN_LANGUAGE_CACHE, result); |
| return result; |
| } |
| |
| @NotNull |
| public List<T> allForLanguage(@NotNull Language l) { |
| List<T> list = forKey(l); |
| if (list.isEmpty()) { |
| Language base = l.getBaseLanguage(); |
| if (base != null) { |
| return allForLanguage(base); |
| } |
| } |
| //if (l != Language.ANY) { |
| // final List<T> all = allForLanguage(Language.ANY); |
| // if (!all.isEmpty()) { |
| // if (list.isEmpty()) { |
| // return all; |
| // } |
| // list = new ArrayList<T>(list); |
| // list.addAll(all); |
| // } |
| //} |
| return list; |
| } |
| |
| protected T getDefaultImplementation() { |
| return myDefaultImplementation; |
| } |
| |
| @NotNull |
| protected Key<T> getLanguageCache() { |
| return IN_LANGUAGE_CACHE; |
| } |
| } |