| /* |
| * 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. |
| */ |
| package com.intellij.openapi.fileTypes; |
| |
| import com.intellij.openapi.project.Project; |
| import com.intellij.openapi.vfs.VirtualFile; |
| import com.intellij.util.ReflectionUtil; |
| import com.intellij.util.containers.ConcurrentFactoryMap; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.nio.charset.Charset; |
| import java.util.Map; |
| |
| /** |
| * @author peter |
| */ |
| public class CharsetUtil { |
| @SuppressWarnings("MismatchedQueryAndUpdenateOfCollection") |
| private static final Map<LanguageFileType, Boolean> ourSupportsCharsetDetection = new ConcurrentFactoryMap<LanguageFileType, Boolean>() { |
| @Nullable |
| @Override |
| protected Boolean create(LanguageFileType fileType) { |
| Class<?> ftClass = fileType.getClass(); |
| String methodName = "extractCharsetFromFileContent"; |
| Class declaring1 = ReflectionUtil.getMethodDeclaringClass(ftClass, methodName, Project.class, VirtualFile.class, String.class); |
| Class declaring2 = ReflectionUtil.getMethodDeclaringClass(ftClass, methodName, Project.class, VirtualFile.class, CharSequence.class); |
| return !LanguageFileType.class.equals(declaring1) || !LanguageFileType.class.equals(declaring2); |
| } |
| }; |
| |
| public static Charset extractCharsetFromFileContent(@Nullable Project project, |
| @Nullable VirtualFile virtualFile, |
| @Nullable FileType fileType, |
| @NotNull CharSequence text) { |
| if (fileType instanceof LanguageFileType && |
| // otherwise the default implementations will always convert CharSequence to String unnecessarily, producing garbage |
| ourSupportsCharsetDetection.get(fileType)) { |
| return ((LanguageFileType)fileType).extractCharsetFromFileContent(project, virtualFile, text); |
| } |
| return null; |
| } |
| } |