/*
* Copyright (C) 2008 Google, Inc.
*
* 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 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;
import com.google.common.io.Closer;
/**
* 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();
}
}