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Validators.java
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Validators.java
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/*
* Copyright (c) 2002-2018 "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 <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.util;
import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;
import org.neo4j.io.fs.DefaultFileSystemAbstraction;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.kernel.impl.store.MetaDataStore;
import org.neo4j.kernel.impl.storemigration.StoreFileType;
public class Validators
{
public static final Validator<File> REGEX_FILE_EXISTS = file ->
{
if ( matchingFiles( file ).isEmpty() )
{
throw new IllegalArgumentException( "File '" + file + "' doesn't exist" );
}
};
private Validators()
{
}
static List<File> matchingFiles( File fileWithRegexInName )
{
File parent = fileWithRegexInName.getAbsoluteFile().getParentFile();
if ( parent == null || !parent.exists() )
{
throw new IllegalArgumentException( "Directory of " + fileWithRegexInName + " doesn't exist" );
}
final Pattern pattern = Pattern.compile( fileWithRegexInName.getName() );
List<File> files = new ArrayList<>();
for ( File file : parent.listFiles() )
{
if ( pattern.matcher( file.getName() ).matches() )
{
files.add( file );
}
}
return files;
}
public static final Validator<File> DIRECTORY_IS_WRITABLE = value ->
{
if ( value.mkdirs() )
{ // It's OK, we created the directory right now, which means we have write access to it
return;
}
File test = new File( value, "_______test___" );
try
{
test.createNewFile();
}
catch ( IOException e )
{
throw new IllegalArgumentException( "Directory '" + value + "' not writable: " + e.getMessage() );
}
finally
{
test.delete();
}
};
public static final Validator<File> CONTAINS_NO_EXISTING_DATABASE = value ->
{
try ( FileSystemAbstraction fileSystem = new DefaultFileSystemAbstraction() )
{
if ( isExistingDatabase( fileSystem, value ) )
{
throw new IllegalArgumentException( "Directory '" + value + "' already contains a database" );
}
}
catch ( IOException e )
{
throw new UncheckedIOException( e );
}
};
public static final Validator<File> CONTAINS_EXISTING_DATABASE = dbDir ->
{
try ( FileSystemAbstraction fileSystem = new DefaultFileSystemAbstraction() )
{
if ( !isExistingDatabase( fileSystem, dbDir ) )
{
throw new IllegalArgumentException( "Directory '" + dbDir + "' does not contain a database" );
}
}
catch ( IOException e )
{
throw new UncheckedIOException( e );
}
};
private static boolean isExistingDatabase( FileSystemAbstraction fileSystem, File dbDir )
{
return fileSystem.fileExists( new File( dbDir, StoreFileType.STORE.augment( MetaDataStore.DEFAULT_NAME ) ) );
}
public static Validator<String> inList( String[] validStrings )
{
return value ->
{
if ( Arrays.stream( validStrings ).noneMatch( s -> s.equals( value ) ) )
{
throw new IllegalArgumentException( "'" + value + "' found but must be one of: " +
Arrays.toString( validStrings ) + "." );
}
};
}
public static <T> Validator<T[]> atLeast( final String key, final int length )
{
return value ->
{
if ( value.length < length )
{
throw new IllegalArgumentException( "Expected '" + key + "' to have at least " +
length + " valid item" + (length == 1 ? "" : "s") + ", but had " + value.length +
" " + Arrays.toString( value ) );
}
};
}
public static <T> Validator<T> emptyValidator()
{
return value -> {};
}
public static <T> Validator<T> all( Validator<T>... validators )
{
return value ->
{
for ( Validator<T> validator : validators )
{
validator.validate( value );
}
};
}
}