io.daos.dfs.StatAttributes Maven / Gradle / Ivy
/*
* (C) Copyright 2018-2021 Intel Corporation.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*/
package io.daos.dfs;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* Java attributes representing DAOS struct stat which has below information
* * objId long (8 bytes)
* * mode_t st_mode; (4 bytes)
* * uid_t st_uid; (4 bytes)
* * gid_t st_gid; (4 bytes)
* * off_t st_size; (8 bytes)
* * blkcnt_t st_blocks (8 bytes)
* * blksize_t st_blocksize (8 bytes)
* * struct timespec st_atim; (16 bytes)
* * struct timespec st_mtim; (16 bytes)
* * struct timespec st_ctim; (16 bytes)
* * file boolean (1 byte)
* * length of username (4)
* * username string (32 bytes max)
* * length of groupname (4)
* * groupname string (32 bytes max)
*
*
* This Java representative adds two more fields, object id and file (is file).
*/
public class StatAttributes {
private final long objId;
private final int mode;
private final int uid;
private final int gid;
private final long blockCnt;
private final long blockSize;
private final long length;
private final TimeSpec accessTime;
private final TimeSpec modifyTime;
private final TimeSpec createTime;
private final boolean file;
private final String username;
private final String groupname;
private static final ByteOrder DEFAULT_ORDER = ByteOrder.nativeOrder();
protected StatAttributes(ByteBuffer buffer) {
buffer.order(DEFAULT_ORDER);
objId = buffer.getLong();
mode = buffer.getInt();
uid = buffer.getInt();
gid = buffer.getInt();
blockCnt = buffer.getLong();
blockSize = buffer.getLong();
length = buffer.getLong();
accessTime = new TimeSpec(buffer.getLong(), buffer.getLong());
modifyTime = new TimeSpec(buffer.getLong(), buffer.getLong());
createTime = new TimeSpec(buffer.getLong(), buffer.getLong());
file = buffer.get() > 0;
username = getName(buffer);
groupname = getName(buffer);
}
private String getName(ByteBuffer buffer) {
int len = buffer.getInt();
if (len > 0) {
byte[] bytes = new byte[len];
buffer.get(bytes);
return new String(bytes);
}
return "";
}
public int getMode() {
return mode;
}
public long getObjId() {
return objId;
}
public TimeSpec getAccessTime() {
return accessTime;
}
public TimeSpec getCreateTime() {
return createTime;
}
public int getGid() {
return gid;
}
public long getBlockCnt() {
return blockCnt;
}
public long getBlockSize() {
return blockSize;
}
public long getLength() {
return length;
}
public TimeSpec getModifyTime() {
return modifyTime;
}
public int getUid() {
return uid;
}
public boolean isFile() {
return file;
}
public String getUsername() {
return username;
}
public String getGroupname() {
return groupname;
}
/**
* buffer size in bytes to hold all fields in binary.
* see the class description for size of each field.
*
* @return total buffer size
*/
public static int objectSize() {
return 4 * 8 + 5 * 4 + 3 * 16 + 1 + 64; //165
}
/**
* Java corresponding to C TimeSpec.
*/
public static class TimeSpec {
private final long seconds;
private final long nano;
public TimeSpec(long seconds, long nano) {
this.seconds = seconds;
this.nano = nano;
}
public long getNano() {
return nano;
}
public long getSeconds() {
return seconds;
}
}
}