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/*
* Copyright (C) 2020 Square, Inc.
*
* 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.
*/
package okio
import kotlin.reflect.KClass
import kotlin.reflect.cast
/**
* Description of a file or another object referenced by a path.
*
* In simple use a file system is a mechanism for organizing files and directories on a local
* storage device. In practice file systems are more capable and their contents more varied. For
* example, a path may refer to:
*
* * An operating system process that consumes data, produces data, or both. For example, reading
* from the `/dev/urandom` file on Linux returns a unique sequence of pseudorandom bytes to each
* reader.
*
* * A stream that connects a pair of programs together. A pipe is a special file that a producing
* program writes to and a consuming program reads from. Both programs operate concurrently. The
* size of a pipe is not well defined: the writer can write as much data as the reader is able to
* read.
*
* * A file on a remote file system. The performance and availability of remote files may be quite
* different from that of local files!
*
* * A symbolic link (symlink) to another path. When attempting to access this path the file system
* will follow the link and return data from the target path.
*
* * The same content as another path without a symlink. On UNIX file systems an inode is an
* anonymous handle to a file's content, and multiple paths may target the same inode without any
* other relationship to one another. A consequence of this design is that a directory with three
* 1 GiB files may only need 1 GiB on the storage device.
*
* This class does not attempt to model these rich file system features! It exposes a limited view
* useful for programs with only basic file system needs. Be cautious of the potential consequences
* of special files when writing programs that operate on a file system.
*
* File metadata is subject to change, and code that operates on file systems should defend against
* changes to the file that occur between reading metadata and subsequent operations.
*/
class FileMetadata(
/** True if this file is a container of bytes. If this is true, then [size] is non-null. */
val isRegularFile: Boolean = false,
/**
* True if the path refers to a directory that contains 0 or more child paths.
*
* Note that a path does not need to be a directory for [FileSystem.list] to return successfully.
* For example, mounted storage devices may have child files, but do not identify themselves as
* directories.
*/
val isDirectory: Boolean = false,
/**
* The absolute or relative path that this file is a symlink to, or null if this is not a symlink.
* If this is a relative path, it is relative to the source file's parent directory.
*/
val symlinkTarget: Path? = null,
/**
* The number of bytes readable from this file. The amount of storage resources consumed by this
* file may be larger (due to block size overhead, redundant copies for RAID, etc.), or smaller
* (due to file system compression, shared inodes, etc).
*/
val size: Long? = null,
/**
* The system time of the host computer when this file was created, if the host file system
* supports this feature. This is typically available on Windows NTFS file systems and not
* available on UNIX or Windows FAT file systems.
*/
val createdAtMillis: Long? = null,
/**
* The system time of the host computer when this file was most recently written.
*
* Note that the accuracy of the returned time may be much more coarse than its precision. In
* particular, this value is expressed with millisecond precision but may be accessed at
* second- or day-accuracy only.
*/
val lastModifiedAtMillis: Long? = null,
/**
* The system time of the host computer when this file was most recently read or written.
*
* Note that the accuracy of the returned time may be much more coarse than its precision. In
* particular, this value is expressed with millisecond precision but may be accessed at
* second- or day-accuracy only.
*/
val lastAccessedAtMillis: Long? = null,
extras: Map, Any> = mapOf(),
) {
/**
* Additional file system-specific metadata organized by the class of that metadata. File systems
* may use this to include information like permissions, content-type, or linked applications.
*
* Values in this map should be instances of immutable classes. Keys should be the types of those
* classes.
*/
val extras: Map, Any> = extras.toMap()
/** Returns extra metadata of type [type], or null if no such metadata is held. */
fun extra(type: KClass): T? {
val value = extras[type] ?: return null
return type.cast(value)
}
fun copy(
isRegularFile: Boolean = this.isRegularFile,
isDirectory: Boolean = this.isDirectory,
symlinkTarget: Path? = this.symlinkTarget,
size: Long? = this.size,
createdAtMillis: Long? = this.createdAtMillis,
lastModifiedAtMillis: Long? = this.lastModifiedAtMillis,
lastAccessedAtMillis: Long? = this.lastAccessedAtMillis,
extras: Map, Any> = this.extras,
): FileMetadata {
return FileMetadata(
isRegularFile = isRegularFile,
isDirectory = isDirectory,
symlinkTarget = symlinkTarget,
size = size,
createdAtMillis = createdAtMillis,
lastAccessedAtMillis = lastAccessedAtMillis,
lastModifiedAtMillis = lastModifiedAtMillis,
extras = extras,
)
}
override fun toString(): String {
val fields = mutableListOf()
if (isRegularFile) fields += "isRegularFile"
if (isDirectory) fields += "isDirectory"
if (size != null) fields += "byteCount=$size"
if (createdAtMillis != null) fields += "createdAt=$createdAtMillis"
if (lastModifiedAtMillis != null) fields += "lastModifiedAt=$lastModifiedAtMillis"
if (lastAccessedAtMillis != null) fields += "lastAccessedAt=$lastAccessedAtMillis"
if (extras.isNotEmpty()) fields += "extras=$extras"
return fields.joinToString(separator = ", ", prefix = "FileMetadata(", postfix = ")")
}
}
