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; Copyright (c) Rich Hickey. All rights reserved.
; The use and distribution terms for this software are covered by the
; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
; which can be found in the file epl-v10.html at the root of this distribution.
; By using this software in any fashion, you are agreeing to be bound by
; the terms of this license.
; You must not remove this notice, or any other, from this software.
(ns
^{:author "Stuart Sierra, Chas Emerick, Stuart Halloway",
:doc "This file defines polymorphic I/O utility functions for Clojure."}
clojure.java.io
(:require clojure.string)
(:import
(java.io Reader InputStream InputStreamReader PushbackReader
BufferedReader File OutputStream
OutputStreamWriter BufferedWriter Writer
FileInputStream FileOutputStream ByteArrayOutputStream
StringReader ByteArrayInputStream
BufferedInputStream BufferedOutputStream
CharArrayReader Closeable)
(java.net URI URL MalformedURLException Socket URLDecoder URLEncoder)))
(def
^{:doc "Type object for a Java primitive byte array."
:private true
}
byte-array-type (class (make-array Byte/TYPE 0)))
(def
^{:doc "Type object for a Java primitive char array."
:private true}
char-array-type (class (make-array Character/TYPE 0)))
(defprotocol ^{:added "1.2"} Coercions
"Coerce between various 'resource-namish' things."
(^{:tag java.io.File, :added "1.2"} as-file [x] "Coerce argument to a file.")
(^{:tag java.net.URL, :added "1.2"} as-url [x] "Coerce argument to a URL."))
(defn- escaped-utf8-urlstring->str [s]
(-> (clojure.string/replace s "+" (URLEncoder/encode "+" "UTF-8"))
(URLDecoder/decode "UTF-8")))
(extend-protocol Coercions
nil
(as-file [_] nil)
(as-url [_] nil)
String
(as-file [s] (File. s))
(as-url [s] (URL. s))
File
(as-file [f] f)
(as-url [f] (.toURL (.toURI f)))
URL
(as-url [u] u)
(as-file [u]
(if (= "file" (.getProtocol u))
(as-file (escaped-utf8-urlstring->str
(.replace (.getFile u) \/ File/separatorChar)))
(throw (IllegalArgumentException. (str "Not a file: " u)))))
URI
(as-url [u] (.toURL u))
(as-file [u] (as-file (as-url u))))
(defprotocol ^{:added "1.2"} IOFactory
"Factory functions that create ready-to-use, buffered versions of
the various Java I/O stream types, on top of anything that can
be unequivocally converted to the requested kind of stream.
Common options include
:append true to open stream in append mode
:encoding string name of encoding to use, e.g. \"UTF-8\".
Callers should generally prefer the higher level API provided by
reader, writer, input-stream, and output-stream."
(^{:added "1.2"} make-reader [x opts] "Creates a BufferedReader. See also IOFactory docs.")
(^{:added "1.2"} make-writer [x opts] "Creates a BufferedWriter. See also IOFactory docs.")
(^{:added "1.2"} make-input-stream [x opts] "Creates a BufferedInputStream. See also IOFactory docs.")
(^{:added "1.2"} make-output-stream [x opts] "Creates a BufferedOutputStream. See also IOFactory docs."))
(defn ^Reader reader
"Attempts to coerce its argument into an open java.io.Reader.
Default implementations always return a java.io.BufferedReader.
Default implementations are provided for Reader, BufferedReader,
InputStream, File, URI, URL, Socket, byte arrays, character arrays,
and String.
If argument is a String, it tries to resolve it first as a URI, then
as a local file name. URIs with a 'file' protocol are converted to
local file names.
Should be used inside with-open to ensure the Reader is properly
closed."
{:added "1.2"}
[x & opts]
(make-reader x (when opts (apply hash-map opts))))
(defn ^Writer writer
"Attempts to coerce its argument into an open java.io.Writer.
Default implementations always return a java.io.BufferedWriter.
Default implementations are provided for Writer, BufferedWriter,
OutputStream, File, URI, URL, Socket, and String.
If the argument is a String, it tries to resolve it first as a URI, then
as a local file name. URIs with a 'file' protocol are converted to
local file names.
Should be used inside with-open to ensure the Writer is properly
closed."
{:added "1.2"}
[x & opts]
(make-writer x (when opts (apply hash-map opts))))
(defn ^InputStream input-stream
"Attempts to coerce its argument into an open java.io.InputStream.
Default implementations always return a java.io.BufferedInputStream.
Default implementations are defined for InputStream, File, URI, URL,
Socket, byte array, and String arguments.
If the argument is a String, it tries to resolve it first as a URI, then
as a local file name. URIs with a 'file' protocol are converted to
local file names.
Should be used inside with-open to ensure the InputStream is properly
closed."
{:added "1.2"}
[x & opts]
(make-input-stream x (when opts (apply hash-map opts))))
(defn ^OutputStream output-stream
"Attempts to coerce its argument into an open java.io.OutputStream.
Default implementations always return a java.io.BufferedOutputStream.
Default implementations are defined for OutputStream, File, URI, URL,
Socket, and String arguments.
If the argument is a String, it tries to resolve it first as a URI, then
as a local file name. URIs with a 'file' protocol are converted to
local file names.
Should be used inside with-open to ensure the OutputStream is
properly closed."
{:added "1.2"}
[x & opts]
(make-output-stream x (when opts (apply hash-map opts))))
(defn- ^Boolean append? [opts]
(boolean (:append opts)))
(defn- ^String encoding [opts]
(or (:encoding opts) "UTF-8"))
(defn- buffer-size [opts]
(or (:buffer-size opts) 1024))
(def default-streams-impl
{:make-reader (fn [x opts] (make-reader (make-input-stream x opts) opts))
:make-writer (fn [x opts] (make-writer (make-output-stream x opts) opts))
:make-input-stream (fn [x opts]
(throw (IllegalArgumentException.
(str "Cannot open <" (pr-str x) "> as an InputStream."))))
:make-output-stream (fn [x opts]
(throw (IllegalArgumentException.
(str "Cannot open <" (pr-str x) "> as an OutputStream."))))})
(defn- inputstream->reader
[^InputStream is opts]
(make-reader (InputStreamReader. is (encoding opts)) opts))
(defn- outputstream->writer
[^OutputStream os opts]
(make-writer (OutputStreamWriter. os (encoding opts)) opts))
(extend BufferedInputStream
IOFactory
(assoc default-streams-impl
:make-input-stream (fn [x opts] x)
:make-reader inputstream->reader))
(extend InputStream
IOFactory
(assoc default-streams-impl
:make-input-stream (fn [x opts] (BufferedInputStream. x))
:make-reader inputstream->reader))
(extend Reader
IOFactory
(assoc default-streams-impl
:make-reader (fn [x opts] (BufferedReader. x))))
(extend BufferedReader
IOFactory
(assoc default-streams-impl
:make-reader (fn [x opts] x)))
(extend Writer
IOFactory
(assoc default-streams-impl
:make-writer (fn [x opts] (BufferedWriter. x))))
(extend BufferedWriter
IOFactory
(assoc default-streams-impl
:make-writer (fn [x opts] x)))
(extend OutputStream
IOFactory
(assoc default-streams-impl
:make-output-stream (fn [x opts] (BufferedOutputStream. x))
:make-writer outputstream->writer))
(extend BufferedOutputStream
IOFactory
(assoc default-streams-impl
:make-output-stream (fn [x opts] x)
:make-writer outputstream->writer))
(extend File
IOFactory
(assoc default-streams-impl
:make-input-stream (fn [^File x opts] (make-input-stream (FileInputStream. x) opts))
:make-output-stream (fn [^File x opts] (make-output-stream (FileOutputStream. x (append? opts)) opts))))
(extend URL
IOFactory
(assoc default-streams-impl
:make-input-stream (fn [^URL x opts]
(make-input-stream
(if (= "file" (.getProtocol x))
(FileInputStream. (as-file x))
(.openStream x)) opts))
:make-output-stream (fn [^URL x opts]
(if (= "file" (.getProtocol x))
(make-output-stream (as-file x) opts)
(throw (IllegalArgumentException. (str "Can not write to non-file URL <" x ">")))))))
(extend URI
IOFactory
(assoc default-streams-impl
:make-input-stream (fn [^URI x opts] (make-input-stream (.toURL x) opts))
:make-output-stream (fn [^URI x opts] (make-output-stream (.toURL x) opts))))
(extend String
IOFactory
(assoc default-streams-impl
:make-input-stream (fn [^String x opts]
(try
(make-input-stream (URL. x) opts)
(catch MalformedURLException e
(make-input-stream (File. x) opts))))
:make-output-stream (fn [^String x opts]
(try
(make-output-stream (URL. x) opts)
(catch MalformedURLException err
(make-output-stream (File. x) opts))))))
(extend Socket
IOFactory
(assoc default-streams-impl
:make-input-stream (fn [^Socket x opts] (make-input-stream (.getInputStream x) opts))
:make-output-stream (fn [^Socket x opts] (make-output-stream (.getOutputStream x) opts))))
(extend byte-array-type
IOFactory
(assoc default-streams-impl
:make-input-stream (fn [x opts] (make-input-stream (ByteArrayInputStream. x) opts))))
(extend char-array-type
IOFactory
(assoc default-streams-impl
:make-reader (fn [x opts] (make-reader (CharArrayReader. x) opts))))
(extend Object
IOFactory
default-streams-impl)
(extend nil
IOFactory
(assoc default-streams-impl
:make-reader (fn [x opts]
(throw (IllegalArgumentException.
(str "Cannot open <" (pr-str x) "> as a Reader."))))
:make-writer (fn [x opts]
(throw (IllegalArgumentException.
(str "Cannot open <" (pr-str x) "> as a Writer."))))))
(defmulti
^{:doc "Internal helper for copy"
:private true
:arglists '([input output opts])}
do-copy
(fn [input output opts] [(type input) (type output)]))
(defmethod do-copy [InputStream OutputStream] [^InputStream input ^OutputStream output opts]
(let [buffer (make-array Byte/TYPE (buffer-size opts))]
(loop []
(let [size (.read input buffer)]
(when (pos? size)
(do (.write output buffer 0 size)
(recur)))))))
(defmethod do-copy [InputStream Writer] [^InputStream input ^Writer output opts]
(let [^"[C" buffer (make-array Character/TYPE (buffer-size opts))
in (InputStreamReader. input (encoding opts))]
(loop []
(let [size (.read in buffer 0 (alength buffer))]
(if (pos? size)
(do (.write output buffer 0 size)
(recur)))))))
(defmethod do-copy [InputStream File] [^InputStream input ^File output opts]
(with-open [out (FileOutputStream. output)]
(do-copy input out opts)))
(defmethod do-copy [Reader OutputStream] [^Reader input ^OutputStream output opts]
(let [^"[C" buffer (make-array Character/TYPE (buffer-size opts))
out (OutputStreamWriter. output (encoding opts))]
(loop []
(let [size (.read input buffer)]
(if (pos? size)
(do
(.write out buffer 0 size)
(recur))
(.flush out))))))
(defmethod do-copy [Reader Writer] [^Reader input ^Writer output opts]
(let [^"[C" buffer (make-array Character/TYPE (buffer-size opts))]
(loop []
(let [size (.read input buffer)]
(when (pos? size)
(do (.write output buffer 0 size)
(recur)))))))
(defmethod do-copy [Reader File] [^Reader input ^File output opts]
(with-open [out (FileOutputStream. output)]
(do-copy input out opts)))
(defmethod do-copy [File OutputStream] [^File input ^OutputStream output opts]
(with-open [in (FileInputStream. input)]
(do-copy in output opts)))
(defmethod do-copy [File Writer] [^File input ^Writer output opts]
(with-open [in (FileInputStream. input)]
(do-copy in output opts)))
(defmethod do-copy [File File] [^File input ^File output opts]
(with-open [in (-> input FileInputStream. .getChannel)
out (-> output FileOutputStream. .getChannel)]
(let [sz (.size in)]
(loop [pos 0]
(let [bytes-xferred (.transferTo in pos (- sz pos) out)
pos (+ pos bytes-xferred)]
(when (< pos sz)
(recur pos)))))))
(defmethod do-copy [String OutputStream] [^String input ^OutputStream output opts]
(do-copy (StringReader. input) output opts))
(defmethod do-copy [String Writer] [^String input ^Writer output opts]
(do-copy (StringReader. input) output opts))
(defmethod do-copy [String File] [^String input ^File output opts]
(do-copy (StringReader. input) output opts))
(defmethod do-copy [char-array-type OutputStream] [input ^OutputStream output opts]
(do-copy (CharArrayReader. input) output opts))
(defmethod do-copy [char-array-type Writer] [input ^Writer output opts]
(do-copy (CharArrayReader. input) output opts))
(defmethod do-copy [char-array-type File] [input ^File output opts]
(do-copy (CharArrayReader. input) output opts))
(defmethod do-copy [byte-array-type OutputStream] [^"[B" input ^OutputStream output opts]
(do-copy (ByteArrayInputStream. input) output opts))
(defmethod do-copy [byte-array-type Writer] [^"[B" input ^Writer output opts]
(do-copy (ByteArrayInputStream. input) output opts))
(defmethod do-copy [byte-array-type File] [^"[B" input ^Writer output opts]
(do-copy (ByteArrayInputStream. input) output opts))
(defn copy
"Copies input to output. Returns nil or throws IOException.
Input may be an InputStream, Reader, File, byte[], or String.
Output may be an OutputStream, Writer, or File.
Options are key/value pairs and may be one of
:buffer-size buffer size to use, default is 1024.
:encoding encoding to use if converting between
byte and char streams.
Does not close any streams except those it opens itself
(on a File)."
{:added "1.2"}
[input output & opts]
(do-copy input output (when opts (apply hash-map opts))))
(defn ^String as-relative-path
"Take an as-file-able thing and return a string if it is
a relative path, else IllegalArgumentException."
{:added "1.2"}
[x]
(let [^File f (as-file x)]
(if (.isAbsolute f)
(throw (IllegalArgumentException. (str f " is not a relative path")))
(.getPath f))))
(defn ^File file
"Returns a java.io.File, passing each arg to as-file. Multiple-arg
versions treat the first argument as parent and subsequent args as
children relative to the parent."
{:added "1.2"}
([arg]
(as-file arg))
([parent child]
(File. ^File (as-file parent) ^String (as-relative-path child)))
([parent child & more]
(reduce file (file parent child) more)))
(defn delete-file
"Delete file f. Raise an exception if it fails unless silently is true."
{:added "1.2"}
[f & [silently]]
(or (.delete (file f))
silently
(throw (java.io.IOException. (str "Couldn't delete " f)))))
(defn make-parents
"Given the same arg(s) as for file, creates all parent directories of
the file they represent."
{:added "1.2"}
[f & more]
(when-let [parent (.getParentFile ^File (apply file f more))]
(.mkdirs parent)))
(defn ^URL resource
"Returns the URL for a named resource. Use the context class loader
if no loader is specified."
{:added "1.2"}
([n] (resource n (.getContextClassLoader (Thread/currentThread))))
([n ^ClassLoader loader] (.getResource loader n)))
