java.nio.NioUtils Maven / Gradle / Ivy
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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
*
* 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.
*/
package java.nio;
import java.io.FileDescriptor;
import java.nio.channels.FileChannel;
/**
* @hide internal use only
*/
public final class NioUtils {
private NioUtils() {
}
public static void freeDirectBuffer(ByteBuffer buffer) {
if (buffer == null) {
return;
}
((DirectByteBuffer) buffer).free();
}
/**
* Returns the int file descriptor from within the given FileChannel 'fc'.
*/
public static FileDescriptor getFD(FileChannel fc) {
return ((FileChannelImpl) fc).getFD();
}
/**
* Helps bridge between io and nio.
*/
public static FileChannel newFileChannel(Object stream, FileDescriptor fd, int mode) {
return new FileChannelImpl(stream, fd, mode);
}
/**
* Exposes the array backing a non-direct ByteBuffer, even if the ByteBuffer is read-only.
* Normally, attempting to access the array backing a read-only buffer throws.
*/
public static byte[] unsafeArray(ByteBuffer b) {
return ((ByteArrayBuffer) b).backingArray;
}
/**
* Exposes the array offset for the array backing a non-direct ByteBuffer,
* even if the ByteBuffer is read-only.
*/
public static int unsafeArrayOffset(ByteBuffer b) {
return ((ByteArrayBuffer) b).arrayOffset;
}
}