HostsFileEntriesProvider.java — netty Source File

Source Code

/*
 * Copyright 2021 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 *   https://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 io.netty.resolver;

import io.netty.util.NetUtil;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Pattern;

import static io.netty.util.internal.ObjectUtil.checkNotNull;

/**
 * A container of hosts file entries
 */
public final class HostsFileEntriesProvider {

    public interface Parser {

        /**
         * Parses the hosts file at standard OS location using the system default {@link Charset} for decoding.
         *
         * @return a new {@link HostsFileEntriesProvider}
         * @throws IOException file could not be read
         */
        HostsFileEntriesProvider parse() throws IOException;

        /**
         * Parses the hosts file at standard OS location using the given {@link Charset}s one after another until
         * parse something or none is left.
         *
// ... (248 more lines)