Here you can find the source of ensureEncodingSet(List
public static List<String> ensureEncodingSet(List<String> options, Charset defaultEncoding)
//package com.java2s; /*//w ww. j av a 2 s . c o m * Copyright 2014 Google Inc. All rights reserved. * * 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. */ import java.nio.charset.Charset; import java.util.List; import javax.annotation.Nullable; public class Main { /** If there is no encoding set, make sure to set the default encoding. */ public static List<String> ensureEncodingSet(List<String> options, Charset defaultEncoding) { if (getEncodingOption(options) == null) { options.add("-encoding"); options.add(defaultEncoding.name()); } return options; } /** * Extract the encoding flag from the list of javac options. If the flag is specified more than * once, returns the last copy, which matches javac's behavior. If the flag is not specified, * returns null. */ public static @Nullable Charset getEncodingOption(List<String> options) { int i = options.lastIndexOf("-encoding"); return (i >= 0) ? Charset.forName(options.get(i + 1)) : null; } }