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ONgDB kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see https://graphfoundation.org.
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/*
 * Copyright (c) 2018-2020 "Graph Foundation,"
 * Graph Foundation, Inc. [https://graphfoundation.org]
 *
 * This file is part of ONgDB.
 *
 * ONgDB is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
/*
 * Copyright (c) 2002-2020 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.kernel.impl.util;

import java.io.File;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Stream;

import org.neo4j.helpers.HostnamePort;
import org.neo4j.helpers.collection.Pair;

import static org.neo4j.function.Predicates.not;

public class Converters
{
    private Converters()
    {
    }

    public static  Function mandatory()
    {
        return key ->
        {
            throw new IllegalArgumentException( "Missing argument '" + key + "'" );
        };
    }

    public static  Function optional()
    {
        return from -> null;
    }

    public static  Function withDefault( final T defaultValue )
    {
        return from -> defaultValue;
    }

    public static Function toFile()
    {
        return File::new;
    }

    public static Function toPath()
    {
        return Paths::get;
    }

    public static Function identity()
    {
        return s -> s;
    }

    public static final Comparator BY_FILE_NAME = Comparator.comparing( File::getName );

    public static final Comparator BY_FILE_NAME_WITH_CLEVER_NUMBERS =
            ( o1, o2 ) -> NumberAwareStringComparator.INSTANCE.compare( o1.getAbsolutePath(), o2.getAbsolutePath() );

    public static Function regexFiles( final boolean cleverNumberRegexSort )
    {
        return name ->
        {
            Comparator sorting = cleverNumberRegexSort ? BY_FILE_NAME_WITH_CLEVER_NUMBERS : BY_FILE_NAME;
            List files = Validators.matchingFiles( new File( name ) );
            files.sort( sorting );
            return files.toArray( new File[files.size()] );
        };
    }

    public static Function toFiles( final String delimiter,
            final Function eachFileConverter )
    {
        return from ->
        {
            if ( from == null )
            {
                return new File[0];
            }

            String[] names = from.split( delimiter );
            List files = new ArrayList<>();
            for ( String name : names )
            {
                files.addAll( Arrays.asList( eachFileConverter.apply( name ) ) );
            }
            return files.toArray( new File[files.size()] );
        };
    }

    public static Function toInt()
    {
        return Integer::new;
    }

    /**
     * Takes a raw address that can have a single port or 2 ports (lower and upper bounds of port range) and
     * processes it to a clean separation of host and ports. When only one port is specified, it is in the lower bound.
     * The presence of an upper bound implies a range.
     *
     * @param rawAddress the raw address that a user can provide via config or command line
     * @return the host, lower bound port, and upper bound port
     */
    public static OptionalHostnamePort toOptionalHostnamePortFromRawAddress( String rawAddress )
    {
        HostnamePort hostnamePort = new HostnamePort( rawAddress );
        Optional processedHost = Optional.ofNullable( hostnamePort.getHost() )
                .map( str -> str.replaceAll( "\\[", "" ) )
                .map( str -> str.replaceAll( "]", "" ) );
        return new OptionalHostnamePort( processedHost, optionalFromZeroable( hostnamePort.getPorts()[0] ),
                optionalFromZeroable( hostnamePort.getPorts()[1] ) );
    }

    private static Optional optionalFromZeroable( int port )
    {
        return port == 0 ? Optional.empty() : Optional.of( port );
    }
}