HostsFileParser.java — netty Source File

Source Code

/*
 * Copyright 2015 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 java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.nio.charset.Charset;
import java.util.List;
import java.util.HashMap;
import java.util.Map;

/**
 * A parser for hosts files.
 * The produced mappings contain only the first entry per hostname.
 * Consider using {@link HostsFileEntriesProvider} when mappings with all entries per hostname are needed.
 */
public final class HostsFileParser {

    /**
     * Parse hosts file at standard OS location using the systems default {@link Charset} for decoding.
     *
     * @return a {@link HostsFileEntries}
     */
    public static HostsFileEntries parseSilently() {
        return hostsFileEntries(HostsFileEntriesProvider.parser().parseSilently());
    }

    /**
     * Parse hosts file at standard OS location using the given {@link Charset}s one after each other until
     * we were able to parse something or none is left.
     *
     * @param charsets the {@link Charset}s to try as file encodings when parsing.
     * @return a {@link HostsFileEntries}
     */
    public static HostsFileEntries parseSilently(Charset... charsets) {
        return hostsFileEntries(HostsFileEntriesProvider.parser().parseSilently(charsets));
    }

    /**
     * Parse hosts file at standard OS location using the system default {@link Charset} for decoding.
     *
     * @return a {@link HostsFileEntries}
     * @throws IOException file could not be read
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