org.seaborne.dboe.sys.FileLib Maven / Gradle / Ivy

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/*
 *  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.
 *
 *  See the NOTICE file distributed with this work for additional
 *  information regarding copyright ownership.
 */

package org.seaborne.dboe.sys;

import java.io.FileNotFoundException ;
import java.io.IOException ;
import java.io.RandomAccessFile ;
import java.nio.channels.FileChannel ;

import org.apache.jena.atlas.io.IO ;
import org.seaborne.dboe.base.file.ChannelManager ;
import org.seaborne.dboe.base.file.FileException ;

// => IO
public class FileLib
{
    // Check whether still used.
    
    public static FileChannel openUnmanaged(String filename) {
        return openUnmanaged(filename, "rw") ;
    }

    // And operation from BufferChannelFile
    
    public static FileChannel openUnmanaged(String filename, String mode) {
        try {
            @SuppressWarnings("resource")
            RandomAccessFile out = new RandomAccessFile(filename, mode) ;
            FileChannel channel = out.getChannel() ;
            return channel ;
        }
        catch (FileNotFoundException e) {
            IO.exception(e) ;
            return null ;
        }
    }

    // TODO remove and call ChannelManager directly 
    public static FileChannel openManaged(String filename) {
        return openManaged(filename, "rw") ;
    }

    // TODO remove and call ChannelManager directly 
    public static FileChannel openManaged(String filename, String mode) {
        return ChannelManager.acquire(filename, mode) ;
    }

    public static long size(FileChannel channel) {
        try {
            return channel.size() ;
        } catch (IOException ex)
        { IO.exception(ex) ; return -1L ; }
    }

    public static void truncate(FileChannel channel, long posn) {
        try { channel.truncate(posn) ; }
        catch (IOException ex) { IO.exception(ex) ; }
    }

    public static void close(FileChannel channel) {
        ChannelManager.release(channel) ;
    }

    public static void sync(FileChannel channel) {
        try {
            channel.force(true) ;
        } catch (IOException ex)
        { throw new FileException("FileBase.sync", ex) ; }
    }
}