JDK8/Java8源码在线阅读
/*
* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* jrunscript JavaScript built-in functions and objects.
*/
/**
* Creates an object that delegates all method calls on
* it to the 'invoke' method on the given delegate object.<br>
*
* Example:
* <pre>
* <code>
* var x = { invoke: function(name, args) { //code...}
* var y = new JSInvoker(x);
* y.func(3, 3); // calls x.invoke('func', args); where args is array of arguments
* </code>
* </pre>
* @param obj object to be wrapped by JSInvoker
* @constructor
*/
function JSInvoker(obj) {
return new JSAdapter({
__get__ : function(name) {
return function() {
return obj.invoke(name, arguments);
}
}
});
}
/**
* This variable represents OS environment. Environment
* variables can be accessed as fields of this object. For
* example, env.PATH will return PATH value configured.
*/
var env = new JSAdapter({
__get__ : function (name) {
return java.lang.System.getenv(name);
},
__has__ : function (name) {
return java.lang.System.getenv().containsKey(name);
},
__getIds__ : function() {
return java.lang.System.getenv().keySet().toArray();
},
__delete__ : function(name) {
println("can't delete env item");
},
__put__ : function (name, value) {
println("can't change env item");
},
toString: function() {
return java.lang.System.getenv().toString();
}
});
/**
* Creates a convenient script object to deal with java.util.Map instances.
* The result script object's field names are keys of the Map. For example,
* scriptObj.keyName can be used to access value associated with given key.<br>
* Example:
* <pre>
* <code>
* var x = java.lang.SystemProperties();
* var y = jmap(x);
* println(y['java.class.path']); // prints java.class.path System property
* delete y['java.class.path']; // remove java.class.path System property
* </code>
* </pre>
*
* @param map java.util.Map instance that will be wrapped
* @constructor
*/
function jmap(map) {
return new JSAdapter({
__get__ : function(name) {
if (map.containsKey(name)) {
return map.get(name);
} else {
return undefined;
}
},
__has__ : function(name) {
return map.containsKey(name);
},
__delete__ : function (name) {
return map.remove(name);
},
__put__ : function(name, value) {
map.put(name, value);
},
__getIds__ : function() {
return map.keySet().toArray();
},
toString: function() {
return map.toString();
}
});
}
/**
* Creates a convenient script object to deal with java.util.List instances.
* The result script object behaves like an array. For example,
* scriptObj[index] syntax can be used to access values in the List instance.
* 'length' field gives size of the List. <br>
*
* Example:
* <pre>
* <code>
* var x = new java.util.ArrayList(4);
* x.add('Java');
* x.add('JavaScript');
* x.add('SQL');
* x.add('XML');
*
* var y = jlist(x);
* println(y[2]); // prints third element of list
* println(y.length); // prints size of the list
*
* @param map java.util.List instance that will be wrapped
* @constructor
*/
function jlist(list) {
function isValid(index) {
return typeof(index) == 'number' &&
index > -1 && index < list.size();
}
return new JSAdapter({
__get__ : function(name) {
if (isValid(name)) {
return list.get(name);
} else if (name == 'length') {
return list.size();
} else {
return undefined;
}
},
__has__ : function (name) {
return isValid(name) || name == 'length';
},
__delete__ : function(name) {
if (isValid(name)) {
list.remove(name);
}
},
__put__ : function(name, value) {
if (isValid(name)) {
list.set(name, value);
}
},
__getIds__: function() {
var res = new Array(list.size());
for (var i = 0; i < res.length; i++) {
res[i] = i;
}
return res;
},
toString: function() {
return list.toString();
}
});
}
/**
* This is java.lang.System properties wrapped by JSAdapter.
* For eg. to access java.class.path property, you can use
* the syntax sysProps["java.class.path"]
*/
var sysProps = new JSAdapter({
__get__ : function (name) {
return java.lang.System.getProperty(name);
},
__has__ : function (name) {
return java.lang.System.getProperty(name) != null;
},
__getIds__ : function() {
return java.lang.System.getProperties().keySet().toArray();
},
__delete__ : function(name) {
java.lang.System.clearProperty(name);
return true;
},
__put__ : function (name, value) {
java.lang.System.setProperty(name, value);
},
toString: function() {
return "<system properties>";
}
});
// stdout, stderr & stdin
var out = java.lang.System.out;
var err = java.lang.System.err;
// can't use 'in' because it is a JavaScript keyword :-(
var inp = java.lang.System["in"];
var BufferedInputStream = java.io.BufferedInputStream;
var BufferedOutputStream = java.io.BufferedOutputStream;
var BufferedReader = java.io.BufferedReader;
var DataInputStream = java.io.DataInputStream;
var File = java.io.File;
var FileInputStream = java.io.FileInputStream;
var FileOutputStream = java.io.FileOutputStream;
var InputStream = java.io.InputStream;
var InputStreamReader = java.io.InputStreamReader;
var OutputStream = java.io.OutputStream;
var Reader = java.io.Reader;
var URL = java.net.URL;
/**
* Generic any object to input stream mapper
* @param str input file name, URL or InputStream
* @return InputStream object
* @private
*/
function inStream(str) {
if (typeof(str) == "string") {
// '-' means standard input
if (str == '-') {
return java.lang.System["in"];
}
// try file first
var file = null;
try {
file = pathToFile(str);
} catch (e) {
}
if (file && file.exists()) {
return new FileInputStream(file);
} else {
try {
// treat the string as URL
return new URL(str).openStream();
} catch (e) {
throw 'file or URL ' + str + ' not found';
}
}
} else {
if (str instanceof InputStream) {
return str;
} else if (str instanceof URL) {
return str.openStream();
} else if (str instanceof File) {
return new FileInputStream(str);
}
}
// everything failed, just give input stream
return java.lang.System["in"];
}
/**
* Generic any object to output stream mapper
*
* @param out output file name or stream
* @return OutputStream object
* @private
*/
function outStream(out) {
if (typeof(out) == "string") {
if (out == '>') {
return java.lang.System.out;
} else {
// treat it as file
return new FileOutputStream(pathToFile(out));
}
} else {
if (out instanceof OutputStream) {
return out;
} else if (out instanceof File) {
return new FileOutputStream(out);
}
}
// everything failed, just return System.out
return java.lang.System.out;
}
/**
* stream close takes care not to close stdin, out & err.
* @private
*/
function streamClose(stream) {
if (stream) {
if (stream != java.lang.System["in"] &&
stream != java.lang.System.out &&
stream != java.lang.System.err) {
try {
stream.close();
} catch (e) {
println(e);
}
}
}
}
/**
* Loads and evaluates JavaScript code from a stream or file or URL<br>
*
* Examples:
* <pre>
* <code>
* load('test.js'); // load script file 'test.js'
* load('http://java.sun.com/foo.js'); // load from a URL
* </code>
* </pre>
*
* @param str input from which script is loaded and evaluated
*/
if (typeof(load) == 'undefined') {
this.load = function(str) {
var stream = inStream(str);
var bstream = new BufferedInputStream(stream);
var reader = new BufferedReader(new InputStreamReader(bstream));
var oldFilename = engine.get(engine.FILENAME);
engine.put(engine.FILENAME, str);
try {
engine.eval(reader);
} finally {
engine.put(engine.FILENAME, oldFilename);
streamClose(stream);
}
}
}
// file system utilities
/**
* Creates a Java byte[] of given length
* @param len size of the array to create
* @private
*/
function javaByteArray(len) {
return java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, len);
}
var curDir = new File('.');
/**
* Print present working directory
*/
function pwd() {
println(curDir.getAbsolutePath());
}
/**
* Changes present working directory to given directory
* @param target directory to change to. optional, defaults to user's HOME
*/
function cd(target) {
if (target == undefined) {
target = sysProps["user.home"];
}
if (!(target instanceof File)) {
target = pathToFile(target);
}
if (target.exists() && target.isDirectory()) {
curDir = target;
} else {
println(target + " is not a directory");
}
}
/**
* Converts path to java.io.File taking care of shell present working dir
*
* @param pathname file path to be converted
* @private
*/
function pathToFile(pathname) {
var tmp = pathname;
if (!(tmp instanceof File)) {
tmp = new File(tmp);
}
if (!tmp.isAbsolute()) {
return new File(curDir, pathname);
} else {
return tmp;
}
}
/**
* Copies a file or URL or stream to another file or stream
*
* @param from input file or URL or stream
* @param to output stream or file
*/
function cp(from, to) {
if (from == to) {
println("file " + from + " cannot be copied onto itself!");
return;
}
var inp = inStream(from);
var out = outStream(to);
var binp = new BufferedInputStream(inp);
var bout = new BufferedOutputStream(out);
var buff = javaByteArray(1024);
var len;
while ((len = binp.read(buff)) > 0 )
bout.write(buff, 0, len);
bout.flush();
streamClose(inp);
streamClose(out);
}
/**
* Shows the content of a file or URL or any InputStream<br>
* Examples:
* <pre>
* <code>
* cat('test.txt'); // show test.txt file contents
* cat('http://java.net'); // show the contents from the URL http://java.net
* </code>
* </pre>
* @param obj input to show
* @param pattern optional. show only the lines matching the pattern
*/
function cat(obj, pattern) {
if (obj instanceof File && obj.isDirectory()) {
ls(obj);
return;
}
var inp = null;
if (!(obj instanceof Reader)) {
inp = inStream(obj);
obj = new BufferedReader(new InputStreamReader(inp));
}
var line;
if (pattern) {
var count = 1;
while ((line=obj.readLine()) != null) {
if (line.match(pattern)) {
println(count + "\t: " + line);
}
count++;
}
} else {
while ((line=obj.readLine()) != null) {
println(line);
}
}
}
/**
* Returns directory part of a filename
*
* @param pathname input path name
* @return directory part of the given file name
*/
function dirname(pathname) {
var dirName = ".";
// Normalize '/' to local file separator before work.
var i = pathname.replace('/', File.separatorChar ).lastIndexOf(
File.separator );
if ( i != -1 )
dirName = pathname.substring(0, i);
return dirName;
}
/**
* Creates a new dir of given name
*
* @param dir name of the new directory
*/
function mkdir(dir) {
dir = pathToFile(dir);
println(dir.mkdir()? "created" : "can not create dir");
}
/**
* Creates the directory named by given pathname, including
* any necessary but nonexistent parent directories.
*
* @param dir input path name
*/
function mkdirs(dir) {
dir = pathToFile(dir);
println(dir.mkdirs()? "created" : "can not create dirs");
}
/**
* Removes a given file
*
* @param pathname name of the file
*/
function rm(pathname) {
var file = pathToFile(pathname);
if (!file.exists()) {
println("file not found: " + pathname);
return false;
}
// note that delete is a keyword in JavaScript!
println(file["delete"]()? "deleted" : "can not delete");
}
/**
* Removes a given directory
*
* @param pathname name of the directory
*/
function rmdir(pathname) {
rm(pathname);
}
/**
* Synonym for 'rm'
*/
function del(pathname) {
rm(pathname);
}
/**
* Moves a file to another
*
* @param from original name of the file
* @param to new name for the file
*/
function mv(from, to) {
println(pathToFile(from).renameTo(pathToFile(to))?
"moved" : "can not move");
}
/**
* Synonym for 'mv'.
*/
function ren(from, to) {
mv(from, to);
}
var months = [ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ];
/**
* Helper function called by ls
* @private
*/
function printFile(f) {
var sb = new java.lang.StringBuffer();
sb.append(f.isDirectory()? "d" : "-");
sb.append(f.canRead() ? "r": "-" );
sb.append(f.canWrite() ? "w": "-" );
sb.append(" ");
var d = new java.util.Date(f.lastModified());
var c = new java.util.GregorianCalendar();
c.setTime(d);
var day = c.get(java.util.Calendar.DAY_OF_MONTH);
sb.append(months[c.get(java.util.Calendar.MONTH)]
+ " " + day );
if (day < 10) {
sb.append(" ");
}
// to get fixed length 'length' field
var fieldlen = 8;
var len = new java.lang.StringBuffer();
for(var j=0; j<fieldlen; j++)
len.append(" ");
len.insert(0, java.lang.Long.toString(f.length()));
len.setLength(fieldlen);
// move the spaces to the front
var si = len.toString().indexOf(" ");
if ( si != -1 ) {
var pad = len.toString().substring(si);
len.setLength(si);
len.insert(0, pad);
}
sb.append(len.toString());
sb.append(" ");
sb.append(f.getName());
if (f.isDirectory()) {
sb.append('/');
}
println(sb.toString());
}
/**
* Lists the files in a directory
*
* @param dir directory from which to list the files. optional, default to pwd
* @param filter pattern to filter the files listed. optional, default is '.'.
*/
function ls(dir, filter) {
if (dir) {
dir = pathToFile(dir);
} else {
dir = curDir;
}
if (dir.isDirectory()) {
var files = dir.listFiles();
for (var i in files) {
var f = files[i];
if (filter) {
if(!f.getName().match(filter)) {
continue;
}
}
printFile(f);
}
} else {
printFile(dir);
}
}
/**
* Synonym for 'ls'.
*/
function dir(d, filter) {
ls(d, filter);
}
/**
* Unix-like grep, but accepts JavaScript regex patterns
*
* @param pattern to search in files
* @param files one or more files
*/
function grep(pattern, files /*, one or more files */) {
if (arguments.length < 2) return;
for (var i = 1; i < arguments.length; i++) {
println(arguments[i] + ":");
cat(arguments[i], pattern);
}
}
/**
* Find in files. Calls arbitrary callback function
* for each matching file.<br>
*
* Examples:
* <pre>
* <code>
* find('.')
* find('.', '.*\.class', rm); // remove all .class files
* find('.', '.*\.java'); // print fullpath of each .java file
* find('.', '.*\.java', cat); // print all .java files
* </code>
* </pre>
*
* @param dir directory to search files
* @param pattern to search in the files
* @param callback function to call for matching files
*/
function find(dir, pattern, callback) {
dir = pathToFile(dir);
if (!callback) callback = print;
var files = dir.listFiles();
for (var f in files) {
var file = files[f];
if (file.isDirectory()) {
find(file, pattern, callback);
} else {
if (pattern) {
if (file.getName().match(pattern)) {
callback(file);
}
} else {
callback(file);
}
}
}
}
// process utilities
/**
* Exec's a child process, waits for completion & returns exit code
*
* @param cmd command to execute in child process
*/
function exec(cmd) {
var process = java.lang.Runtime.getRuntime().exec(cmd);
var inp = new DataInputStream(process.getInputStream());
var line = null;
while ((line = inp.readLine()) != null) {
println(line);
}
process.waitFor();
$exit = process.exitValue();
}
if (typeof(exit) == 'undefined') {
/**
* Exit the shell program.
*
* @param exitCode integer code returned to OS shell.
* optional, defaults to 0
*/
this.exit = function (code) {
if (code) {
java.lang.System.exit(code + 0);
} else {
java.lang.System.exit(0);
}
}
}
if (typeof(quit) == 'undefined') {
/**
* synonym for exit
*/
this.quit = function (code) {
exit(code);
}
}
// XML utilities
/**
* Converts input to DOM Document object
*
* @param inp file or reader. optional, without this param,
* this function returns a new DOM Document.
* @return returns a DOM Document object
*/
function XMLDocument(inp) {
var factory = javax.xml.parsers.DocumentBuilderFactory.newInstance();
var builder = factory.newDocumentBuilder();
if (inp) {
if (typeof(inp) == "string") {
return builder.parse(pathToFile(inp));
} else {
return builder.parse(inp);
}
} else {
return builder.newDocument();
}
}
/**
* Converts arbitrary stream, file, URL to XMLSource
*
* @param inp input stream or file or URL
* @return XMLSource object
*/
function XMLSource(inp) {
if (inp instanceof javax.xml.transform.Source) {
return inp;
} else if (inp instanceof Packages.org.w3c.dom.Document) {
return new javax.xml.transform.dom.DOMSource(inp);
} else {
inp = new BufferedInputStream(inStream(inp));
return new javax.xml.transform.stream.StreamSource(inp);
}
}
/**
* Converts arbitrary stream, file to XMLResult
*
* @param inp output stream or file
* @return XMLResult object
*/
function XMLResult(out) {
if (out instanceof javax.xml.transform.Result) {
return out;
} else if (out instanceof Packages.org.w3c.dom.Document) {
return new javax.xml.transform.dom.DOMResult(out);
} else {
out = new BufferedOutputStream(outStream(out));
return new javax.xml.transform.stream.StreamResult(out);
}
}
/**
* Perform XSLT transform
*
* @param inp Input XML to transform (URL, File or InputStream)
* @param style XSL Stylesheet to be used (URL, File or InputStream). optional.
* @param out Output XML (File or OutputStream
*/
function XSLTransform(inp, style, out) {
switch (arguments.length) {
case 2:
inp = arguments[0];
out = arguments[1];
break;
case 3:
inp = arguments[0];
style = arguments[1];
out = arguments[2];
break;
default:
println("XSL transform requires 2 or 3 arguments");
return;
}
var factory = javax.xml.transform.TransformerFactory.newInstance();
var transformer;
if (style) {
transformer = factory.newTransformer(XMLSource(style));
} else {
transformer = factory.newTransformer();
}
var source = XMLSource(inp);
var result = XMLResult(out);
transformer.transform(source, result);
if (source.getInputStream) {
streamClose(source.getInputStream());
}
if (result.getOutputStream) {
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