| /* |
| * Copyright 2008 Google LLC |
| * |
| * 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.google.auto.service.processor; |
| |
| import static com.google.common.base.Charsets.UTF_8; |
| |
| import com.google.common.io.Closer; |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * A helper class for reading and writing Services files. |
| */ |
| final class ServicesFiles { |
| public static final String SERVICES_PATH = "META-INF/services"; |
| |
| private ServicesFiles() {} |
| |
| /** |
| * Returns an absolute path to a service file given the class |
| * name of the service. |
| * |
| * @param serviceName not {@code null} |
| * @return SERVICES_PATH + serviceName |
| */ |
| static String getPath(String serviceName) { |
| return SERVICES_PATH + "/" + serviceName; |
| } |
| |
| /** |
| * Reads the set of service classes from a service file. |
| * |
| * @param input not {@code null}. Closed after use. |
| * @return a not {@code null Set} of service class names. |
| * @throws IOException |
| */ |
| static Set<String> readServiceFile(InputStream input) throws IOException { |
| HashSet<String> serviceClasses = new HashSet<String>(); |
| Closer closer = Closer.create(); |
| try { |
| // TODO(gak): use CharStreams |
| BufferedReader r = closer.register(new BufferedReader(new InputStreamReader(input, UTF_8))); |
| String line; |
| while ((line = r.readLine()) != null) { |
| int commentStart = line.indexOf('#'); |
| if (commentStart >= 0) { |
| line = line.substring(0, commentStart); |
| } |
| line = line.trim(); |
| if (!line.isEmpty()) { |
| serviceClasses.add(line); |
| } |
| } |
| return serviceClasses; |
| } catch (Throwable t) { |
| throw closer.rethrow(t); |
| } finally { |
| closer.close(); |
| } |
| } |
| |
| /** |
| * Writes the set of service class names to a service file. |
| * |
| * @param output not {@code null}. Not closed after use. |
| * @param services a not {@code null Collection} of service class names. |
| * @throws IOException |
| */ |
| static void writeServiceFile(Collection<String> services, OutputStream output) |
| throws IOException { |
| BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(output, UTF_8)); |
| for (String service : services) { |
| writer.write(service); |
| writer.newLine(); |
| } |
| writer.flush(); |
| } |
| } |