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8085937: add autoimports sample script to easily explore Java classes in interactive mode

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Reviewed-by: lagergren, attila
This commit is contained in:
Athijegannathan Sundararajan 2015-06-08 14:10:39 +05:30
parent 2466fa7128
commit 31d1f45723
3 changed files with 267 additions and 0 deletions
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nashorn/samples/autoimports.js Normal file
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# autoimports script requires -scripting mode
/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* It is tedious to import Java classes used in a script. Sometimes it is easier
* use simple names of java classes and have a script auto import Java classes.
* You can load this script at the start of an interactive jjs session or at the
* start of your script. This script defines a __noSuchProperty__ hook to auto
* import Java classes as needed and when they are referred to for the first time
* in your script. You can also call the "autoimports" function to print script
* statements that you need to use in your script, i.e., have the function generate
* a script to import Java classes used by your script so far. After running your
* script, you can call autoimports to get the exact Java imports you need and replace
* the autoimports load with the generated import statements (to avoid costly init of
* the autoimports script).
*/
(function() {
var ArrayList = Java.type("java.util.ArrayList");
var HashMap = Java.type("java.util.HashMap");
var Files = Java.type("java.nio.file.Files");
var FileSystems = Java.type("java.nio.file.FileSystems");
var URI = Java.type("java.net.URI");
// initialize a class to package map by iterating all
// classes available in the system by walking through "jrt fs"
var fs = FileSystems.getFileSystem(URI.create("jrt:/"));
var root = fs.getPath('/');
var clsToPkg = new HashMap();
function addToClsToPkg(c, p) {
if (clsToPkg.containsKey(c)) {
var val = clsToPkg.get(c);
if (val instanceof ArrayList) {
val.add(p);
} else {
var al = new ArrayList();
al.add(val);
al.add(p);
clsToPkg.put(c, al);
}
} else {
clsToPkg.put(c, p);
}
}
// handle collision and allow user to choose package
function getPkgOfCls(c) {
var val = clsToPkg.get(c);
if (val instanceof ArrayList) {
var count = 1;
print("Multiple matches for " + c + ", choose package:");
for each (var v in val) {
print(count + ". " + v);
count++;
}
var choice = parseInt(readLine());
if (isNaN(choice) || choice < 1 || choice > val.size()) {
print("invalid choice: " + choice);
return undefined;
}
return val.get(choice - 1);
} else {
return val;
}
}
Files.walk(root).forEach(function(p) {
if (Files.isRegularFile(p)) {
var str = p.toString();
if (str.endsWith(".class")) {
str = str.substring(1);
var idx = str.indexOf('/');
if (idx != -1) {
str = str.substring(idx + 1);
if (str.startsWith("java") ||
str.startsWith("javax") ||
str.startsWith("org")) {
var lastIdx = str.lastIndexOf('/');
if (lastIdx != -1) {
var pkg = str.substring(0, lastIdx).replaceAll('/', '.');
var cls = str.substring(lastIdx + 1, str.lastIndexOf(".class"));
addToClsToPkg(cls, pkg);
}
}
}
}
}
});
var imports = new ArrayList();
var global = this;
var oldNoSuchProp = global.__noSuchProperty__;
this.__noSuchProperty__ = function(name) {
'use strict';
if (clsToPkg.containsKey(name)) {
var pkg = getPkgOfCls(name);
if (pkg) {
var clsName = pkg + "." + name;
imports.add("var " + name + " = Java.type('" + clsName + "');");
return global[name] = Java.type(clsName);
}
} else if (typeof oldNoSuchProp == 'function') {
return oldNoSuchProp.call(this, name);
}
if (typeof this == 'undefined') {
throw new ReferenceError(name);
} else {
return undefined;
}
}
this.autoimports = function() {
for each (var im in imports) {
print(im);
}
}
})();

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/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Converting between #javascript Date and #java8 LocalDateTime with #nashorn
// JavaScript Date with current time
var d = new Date();
print(d);
// Java 8 java.time classes used
var Instant = java.time.Instant;
var LocalDateTime = java.time.LocalDateTime;
var ZoneId = java.time.ZoneId;
// Date.prototype.getTime
// getTime() method returns the numeric value corresponding to the time
// for the specified date according to universal time. The value returned
// by the getTime() method is the number of milliseconds since 1 January 1970 00:00:00 UTC.
// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getTime
// Java Instant.ofEpochMilli to convert time in milliseconds to Instant object
// https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html#ofEpochMilli-long-
var instant = Instant.ofEpochMilli(d.getTime());
// Instant to LocalDateTime using LocalDateTime.ofInstant
// https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#ofInstant-java.time.Instant-java.time.ZoneId-
var ldt = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
print(ldt);
// converting a LocalDateTime to JavaScript Date
// convert LocalDateTime to Instant first
// https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html#atZone-java.time.ZoneId-
var instant = ldt.atZone(ZoneId.systemDefault()).toInstant();
// instant to to epoch milliseconds
// https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html#toEpochMilli--
// and then to JavaScript Date from time in milliseconds
// https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date
var d1 = new Date(instant.toEpochMilli());
print(d1);

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# usage: jjs secondssince.js
/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Number of seconds elapsed since the specified Instance #nashorn #javascript #java
// Input date and time in ISO 8601 format
// Example: 2001-01-01T00:00:00Z for 1 Jan 2001, 0 GMT
var Instant = java.time.Instant;
var ChronoUnit = java.time.temporal.ChronoUnit;
print("Enter date time:");
var sec = Instant.parse(readLine()).
until(Instant.now(), ChronoUnit.SECONDS);
print(sec);