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<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you 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.
-->
<!DOCTYPE api-answers PUBLIC "-//NetBeans//DTD Arch Answers//EN" "../../nbbuild/antsrc/org/netbeans/nbbuild/Arch.dtd" [
<!ENTITY api-questions SYSTEM "../../nbbuild/antsrc/org/netbeans/nbbuild/Arch-api-questions.xml">
]>
<api-answers
question-version="1.24"
author="jglick@netbeans.org"
>
&api-questions;
<!--
<question id="arch-overall" when="init">
Describe the overall architecture.
<hint>
What will be API for
<a href="http://openide.netbeans.org/tutorial/api-design.html#design.apiandspi">
clients and what support API</a>?
What parts will be pluggable?
How will plug-ins be registered? Please use <code><api type="export"/></code>
to describe your general APIs.
If possible please provide
simple diagrams.
</hint>
</question>
-->
<answer id="arch-overall">
<api group="java" name="JavaPlatformAPI" type="export" category="official">
The Java Platform API permits access to installed Java platforms (for example,
the J2SE JDK, or various mobile-device emulators for J2ME). Particular platform
types are registered by modules and can store customized information about the
platform to disk. <br/>
<b>Note</b> that this module concentrates the part of th API which is independent of
the client desktop (and Swing UI library) environment. Its desktop-dependent counterpart
is in the <a href="@org-netbeans-modules-java-platform-ui@/index.html">
org.netbeans.modules.java.platform.ui</a> module.
</api>
</answer>
<!--
<question id="arch-quality" when="init">
How the <a href="http://www.netbeans.org/community/guidelines/q-evangelism.html">quality</a>
of your code will be tested and
how future regressions are going to be prevented?
<hint>
What kind of testing
you want to use? What/how much area of functionality
should be covered by the tests?
</hint>
</question>
-->
<answer id="arch-quality">
<p>
Ought to be covered by unit tests, with the exception of GUI components which
may need functional tests.
</p>
</answer>
<!--
<question id="arch-time" when="init">
What are the time estimates of the work?
<hint>
Please express your estimates of how long the design, implementation,
stabilization are likely to last. How many people will be needed to
implement this and what is the expected milestone the work should be
ready.
</hint>
</question>
-->
<answer id="arch-time">
<p>
It is working and no major efforts are thought to remain.
</p>
</answer>
<!--
<question id="arch-usecases" when="init">
Describe the main <a href="http://openide.netbeans.org/tutorial/api-design.html#usecase">
use cases</a> of the new API. Who will use it at
what circumstances and what will be the typical code to write
to use the module.
</question>
-->
<answer id="arch-usecases">
<p>
The API can be used by any code wishing to know the list of installed
platforms and information about each one; typically this would be used by
project type providers to implement a customizer dialog. The SPI is intended
to be implemented by a few modules supply support for locating and
introspecting installed platforms, for example a JDK setup wizard.
</p>
</answer>
<!--
<question id="arch-what" when="init">
What is this project good for?
<hint>
Please provide here a few lines describing the project,
what problem it should solve, provide links to documentation,
specifications, etc.
</hint>
</question>
-->
<answer id="arch-what">
<p>
Many Java-based project types need to be able to configure the version and
location of Java to be used when building and running the project. This
API/SPI permits these platforms to be registered and queried, and any
customizations made in an appropriate GUI and persisted to disk.
</p>
</answer>
<!--
<question id="compat-i18n" when="impl">
Is your module correctly internationalized?
<hint>
Correct internationalization means that it obeys instructions
at <a href="http://www.netbeans.org/download/dev/javadoc/org-openide-modules/org/openide/modules/doc-files/i18n-branding.html">
NetBeans I18N pages</a>.
</hint>
</question>
-->
<answer id="compat-i18n">
<p>
Yes. The only UI of platform module is a platform template wizard and customizer and it is localized.
Platforms can provide display names. The main portion of the wizard/customizer UI is supplied by the platform type.
</p>
</answer>
<!--
<question id="compat-standards" when="init">
Does the module implement or define any standards? Is the
implementation exact or does it deviate somehow?
</question>
-->
<answer id="compat-standards">
<p>
No.
</p>
</answer>
<!--
<question id="compat-version" when="impl">
Can your module coexist with earlier and future
versions of itself? Can you correctly read all old settings? Will future
versions be able to read your current settings? Can you read
or politely ignore settings stored by a future version?
<hint>
Very helpful for reading settings is to store version number
there, so future versions can decide whether how to read/convert
the settings and older versions can ignore the new ones.
</hint>
</question>
-->
<answer id="compat-version">
<p>
Yes.
The platform module does not provide any persistence mechanism.
</p>
</answer>
<!--
<question id="dep-jre" when="final">
Which version of JRE do you need (1.2, 1.3, 1.4, etc.)?
<hint>
It is expected that if your module runs on 1.x that it will run
on 1.x+1 if no, state that please. Also describe here cases where
you run different code on different versions of JRE and why.
</hint>
</question>
-->
<answer id="dep-jre">
<p>
1.4+.
</p>
</answer>
<!--
<question id="dep-jrejdk" when="final">
Do you require the JDK or is the JRE enough?
</question>
-->
<answer id="dep-jrejdk">
<p>
JRE, though the <q>default platform</q> (the one running the IDE itself) would
be the JDK.
</p>
</answer>
<!--
<question id="dep-nb" when="init">
What other NetBeans projects and modules does this one depend on?
<hint>
If you want, describe such projects as imported API using
the <code><api name="identification" type="import or export" category="stable" url="where is the description" /></code>
</hint>
</question>
-->
<answer id="dep-nb">
<ol>
<li>
<api group="java" name="Filesystems" type="import" category="official">
<p>
Various purposes.
</p>
</api>
</li>
<li>
<api group="java" name="Actions" type="import" category="official">
<p>
Registration of platform manager action.
</p>
</api>
</li>
<li>
<api group="java" name="Datasystems" type="import" category="official">
<p>
<code>FolderInstance</code> is used only internally.
</p>
</api>
</li>
<li>
<api group="java" name="JavaSupportAPIs" type="import" category="official">
<p>
To return <q>bootstrap libraries</q> and <q>standard libraries</q> as
a <code>ClassPath</code>.
</p>
</api>
</li>
<li>
<api group="java" name="Wizards" type="import" category="official">
<p>
Dialogs used to customize platforms.
</p>
</api>
</li>
<li>
<api group="java" name="Modules" type="import" category="official">
<p>
<code>SpecificationVersion</code> used in the API.
</p>
</api>
</li>
<li>
<api group="java" name="Nodes" type="import" category="official">
<p>
For miscellaneous GUI.
</p>
</api>
</li>
</ol>
</answer>
<!--
<question id="dep-non-nb" when="init">
What other projects outside NetBeans does this one depend on?
<hint>
Some non-NetBeans projects are packaged as NetBeans modules
(see <a href="http://libs.netbeans.org/">libraries</a>) and
it is preferred to use this approach when more modules may
depend on such third-party library.
</hint>
</question>
-->
<answer id="dep-non-nb">
<p>
None.
</p>
</answer>
<!--
<question id="dep-platform" when="init">
On which platforms does your module run? Does it run in the same
way on each?
<hint>
If your module is using JNI or deals with special differences of
OSes like filesystems, etc. please describe here what they are.
</hint>
</question>
-->
<answer id="dep-platform">
<p>
Any.
</p>
</answer>
<answer id="deploy-dependencies">
Nothing.
</answer>
<!--
<question id="deploy-jar" when="impl">
Do you deploy just module JAR file(s) or other files as well?
<hint>
If your module consists of just one module JAR file, just confirm that.
If it uses more than one JAR, describe where they are located, how
they refer to each other.
If it consist of module JAR(s) and other files, please describe
what is their purpose, why other files are necessary. Please
make sure that installation/uninstallation leaves the system
in state as it was before installation.
</hint>
</question>
-->
<answer id="deploy-jar">
<p>
JAR only.
</p>
</answer>
<!--
<question id="deploy-nbm" when="impl">
Can you deploy an NBM via the Update Center?
<hint>
If not why?
</hint>
</question>
-->
<answer id="deploy-nbm">
<p>
Yes.
</p>
</answer>
<!--
<question id="deploy-packages" when="init">
Are packages of your module made inaccessible by not declaring them
public?
<hint>
NetBeans module system allows restriction of access rights to
public classes of your module from other modules. This prevents
unwanted dependencies of others on your code and should be used
whenever possible (<a href="http://www.netbeans.org/download/javadoc/OpenAPIs/org/openide/doc-files/upgrade.html#3.4-public-packages">
public packages
</a>). If you do not restrict access to your classes you are
making it too easy for other people to misuse your implementation
details, that is why you should have good reason for not
restricting package access.
</hint>
</question>
-->
<answer id="deploy-packages">
<p>
Yes, only API and SPI packages are exported.
</p>
</answer>
<!--
<question id="deploy-shared" when="final">
Do you need to be installed in the shared location only, or in the user directory only,
or can your module be installed anywhere?
<hint>
Installation location shall not matter, if it does explain why.
Consider also whether <code>InstalledFileLocator</code> can help.
</hint>
</question>
-->
<answer id="deploy-shared">
<p>
Anywhere.
</p>
</answer>
<!--
<question id="exec-classloader" when="impl">
Does your code create its own class loader(s)?
<hint>
A bit unusual. Please explain why and what for.
</hint>
</question>
-->
<answer id="exec-classloader">
<p>
No.
</p>
</answer>
<!--
<question id="exec-component" when="impl">
Is execution of your code influenced by any (string) property
of any of your components?
<hint>
Often <code>JComponent.getClientProperty</code>, <code>Action.getValue</code>
or <code>PropertyDescriptor.getValue</code>, etc. are used to influence
a behavior of some code. This of course forms an interface that should
be documented. Also if one depends on some interface that an object
implements (<code>component instanceof Runnable</code>) that forms an
API as well.
</hint>
</question>
-->
<answer id="exec-component">
<p>
No.
</p>
</answer>
<!--
<question id="exec-introspection" when="impl">
Does your module use any kind of runtime type information (<code>instanceof</code>,
work with <code>java.lang.Class</code>, etc.)?
<hint>
Check for cases when you have an object of type A and you also
expect it to (possibly) be of type B and do some special action. That
should be documented. The same applies on operations in meta-level
(Class.isInstance(...), Class.isAssignableFrom(...), etc.).
</hint>
</question>
-->
<answer id="exec-introspection">
<p>
No.
</p>
</answer>
<!--
<question id="exec-privateaccess" when="final">
Are you aware of any other parts of the system calling some of
your methods by reflection?
<hint>
If so, describe the "contract" as an API. Likely private or friend one, but
still API and consider rewrite of it.
</hint>
</question>
-->
<answer id="exec-privateaccess">
<p>
No.
</p>
</answer>
<!--
<question id="exec-process" when="impl">
Do you execute an external process from your module? How do you ensure
that the result is the same on different platforms? Do you parse output?
Do you depend on result code?
<hint>
If you feed an input, parse the output please declare that as an API.
</hint>
</question>
-->
<answer id="exec-process">
<p>
No.
</p>
</answer>
<!--
<question id="exec-property" when="impl">
Is execution of your code influenced by any environment or
Java system (<code>System.getProperty</code>) property?
<hint>
If there is a property that can change the behavior of your
code, somebody will likely use it. You should describe what it does
and the <a href="http://openide.netbeans.org/tutorial/api-design.html#life">stability category</a>
of this API. You may use
<pre>
<api type="export" group="property" name="id" category="private" url="http://...">
description of the property, where it is used, what it influence, etc.
</api>
</pre>
</hint>
</question>
-->
<answer id="exec-property">
<p>
No.
</p>
</answer>
<!--
<question id="exec-reflection" when="impl">
Does your code use Java Reflection to execute other code?
<hint>
This usually indicates a missing or insufficient API in the other
part of the system. If the other side is not aware of your dependency
this contract can be easily broken.
</hint>
</question>
-->
<answer id="exec-reflection">
<p>
No.
</p>
</answer>
<!--
<question id="exec-threading" when="impl">
What threading models, if any, does your module adhere to?
<hint>
If your module calls foreign APIs which have a specific threading model,
indicate how you comply with the requirements for multithreaded access
(synchronization, mutexes, etc.) applicable to those APIs.
If your module defines any APIs, or has complex internal structures
that might be used from multiple threads, declare how you protect
data against concurrent access, race conditions, deadlocks, etc.,
and whether such rules are enforced by runtime warnings, errors, assertions, etc.
Examples: a class might be non-thread-safe (like Java Collections); might
be fully thread-safe (internal locking); might require access through a mutex
(and may or may not automatically acquire that mutex on behalf of a client method);
might be able to run only in the event queue; etc.
Also describe when any events are fired: synchronously, asynchronously, etc.
Ideas: <a href="http://core.netbeans.org/proposals/threading/index.html#recommendations">Threading Recommendations</a> (in progress)
</hint>
</question>
-->
<answer id="exec-threading">
<p>
TBD.
</p>
</answer>
<!--
<question id="format-clipboard" when="impl">
Which data flavors (if any) does your code read from or insert to
the clipboard (by access to clipboard on means calling methods on <code>java.awt.datatransfer.Transferable</code>?
<hint>
Often Node's deal with clipboard by usage of <code>Node.clipboardCopy, Node.clipboardCut and Node.pasteTypes</code>.
Check your code for overriding these methods.
</hint>
</question>
-->
<answer id="format-clipboard">
<p>
None.
</p>
</answer>
<!--
<question id="format-dnd" when="impl">
Which protocols (if any) does your code understand during Drag & Drop?
<hint>
Often Node's deal with clipboard by usage of <code>Node.drag, Node.getDropType</code>.
Check your code for overriding these methods. Btw. if they are not overridden, they
by default delegate to <code>Node.clipboardCopy, Node.clipboardCut and Node.pasteTypes</code>.
</hint>
</question>
-->
<answer id="format-dnd">
<p>
None.
</p>
</answer>
<!--
<question id="format-types" when="impl">
Which protocols and file formats (if any) does your module read or write on disk,
or transmit or receive over the network?
</question>
-->
<answer id="format-types">
<p>
None.
</p>
</answer>
<!--
<question id="lookup-lookup" when="init">
Does your module use <code>org.openide.util.Lookup</code>
or any similar technology to find any components to communicate with? Which ones?
<hint>
Please describe the interfaces you are searching for, where
are defined, whether you are searching for just one or more of them,
if the order is important, etc. Also classify the stability of such
API contract.
</hint>
</question>
-->
<answer id="lookup-lookup">
<p>
Instances of the platforms are put into the default lookup by the platform implementors. Rather than query the lookup
clients should use <code>PlatformManager.getInstalledPlatforms()</code>.
</p>
</answer>
<!--
<question id="lookup-register" when="final">
Do you register anything into lookup for other code to find?
<hint>
Do you register using layer file or using <code>META-INF/services</code>?
Who is supposed to find your component?
</hint>
</question>
-->
<answer id="lookup-register">
<ul>
<li>
<p>
Default (J2SE) platform.
</p>
</li>
<li>
<p>
Query implementations relating to Java platforms.
</p>
</li>
</ul>
</answer>
<!--
<question id="lookup-remove" when="final">
Do you remove entries of other modules from lookup?
<hint>
Why? Of course, that is possible, but it can be dangerous. Is the module
your are masking resource from aware of what you are doing?
</hint>
</question>
-->
<answer id="lookup-remove">
<p>
No.
</p>
</answer>
<!--
<question id="perf-exit" when="final">
Does your module run any code on exit?
</question>
-->
<answer id="perf-exit">
<p>
No.
</p>
</answer>
<!--
<question id="perf-huge_dialogs" when="final">
Does your module contain any dialogs or wizards with a large number of
GUI controls such as combo boxes, lists, trees, or text areas?
</question>
-->
<answer id="perf-huge_dialogs">
<p>
Nothing large.
</p>
</answer>
<!--
<question id="perf-limit" when="init">
Are there any hard-coded or practical limits in the number or size of
elements your code can handle?
</question>
-->
<answer id="perf-limit">
<p>
No.
</p>
</answer>
<!--
<question id="perf-mem" when="final">
How much memory does your component consume? Estimate
with a relation to the number of windows, etc.
</question>
-->
<answer id="perf-mem">
<p>
Probably minimal.
</p>
</answer>
<!--
<question id="perf-menus" when="final">
Does your module use dynamically updated context menus, or
context-sensitive actions with complicated enablement logic?
</question>
-->
<answer id="perf-menus">
<p>
No.
</p>
</answer>
<!--
<question id="perf-progress" when="final">
Does your module execute any long-running tasks?
<hint>Long running tasks should never block
AWT thread as it badly hurts the UI
<a href="http://performance.netbeans.org/responsiveness/issues.html">
responsiveness</a>.
Tasks like connecting over
network, computing huge amount of data, compilation
be done asynchronously (for example
using <code>RequestProcessor</code>), definitively it should
not block AWT thread.
</hint>
</question>
-->
<answer id="perf-progress">
<p>
No.
</p>
</answer>
<!--
<question id="perf-scale" when="init">
Which external criteria influence the performance of your
program (size of file in editor, number of files in menu,
in source directory, etc.) and how well your code scales?
<hint>
Please include some estimates, there are other more detailed
questions to answer in later phases of implementation.
</hint>
</question>
-->
<answer id="perf-scale">
<p>
Number of installed platforms.
</p>
</answer>
<!--
<question id="perf-spi" when="init">
How the performance of the plugged in code will be enforced?
<hint>
If you allow foreign code to be plugged into your own module, how
do you enforce, that it will behave correctly and fast and will not
negatively influence the performance of your own module?
</hint>
</question>
-->
<answer id="perf-spi">
<p>
No special provisions.
</p>
</answer>
<!--
<question id="perf-startup" when="final">
Does your module run any code on startup?
</question>
-->
<answer id="perf-startup">
<p>
No.
</p>
</answer>
<!--
<question id="perf-wakeup" when="final">
Does any piece of your code wake up periodically and do something
even when the system is otherwise idle (no user interaction)?
</question>
-->
<answer id="perf-wakeup">
<p>
No.
</p>
</answer>
<!--
<question id="resources-file" when="final">
Does your module use <code>java.io.File</code> directly?
<hint>
NetBeans provide a logical wrapper over plain files called
<code>org.openide.filesystems.FileObject</code> that
provides uniform access to such resources and is the preferred
way that should be used. But of course there can be situations when
this is not suitable.
</hint>
</question>
-->
<answer id="resources-file">
<p>
For miscellaneous purposes.
</p>
</answer>
<!--
<question id="resources-layer" when="final">
Does your module provide own layer? Does it create any files or
folders in it? What it is trying to communicate by that and with which
components?
<hint>
NetBeans allows automatic and declarative installation of resources
by module layers. Module register files into appropriate places
and other components use that information to perform their task
(build menu, toolbar, window layout, list of templates, set of
options, etc.).
</hint>
</question>
-->
<answer id="resources-layer">
<p>
The folder <code>org-netbeans-api-java/platform/installers</code> on the system filesystem is used
to store the <code>PlatformInstall</code> instance files.
</p>
<p>
The folder <code>Services/Platforms/org-netbeans-api-java-Platform</code> on the system filesystem is used
to store the Java platform definitions.
</p>
</answer>
<!--
<question id="resources-mask" when="final">
Does your module mask/hide/override any resources provided by other modules in
their layers?
<hint>
If you mask a file provided by another module, you probably depend
on that and do not want the other module to (for example) change
the file's name. That module shall thus make that file available as an API
of some stability category.
</hint>
</question>
-->
<answer id="resources-mask">
<p>
No.
</p>
</answer>
<!--
<question id="resources-read" when="final">
Does your module read any resources from layers? For what purpose?
<hint>
As this is some kind of intermodule dependency, it is a kind of API.
Please describe it and classify according to
<a href="http://openide.netbeans.org/tutorial/api-design.html#categories">
common stability categories</a>.
</hint>
</question>
-->
<answer id="resources-read">
<p>
<code>JavaPlatform</code> and <code>PlatformInstall</code> instances are read from the system filesystem.
</p>
</answer>
<!--
<question id="security-grant" when="final">
Does your code grant additional rights to some other code?
<hint>Avoid using a class loader that adds extra
permissions to loaded code unless really necessary.
Also note that your API implementation
can also expose unneeded permissions to enemy code by
calling AccessController.doPrivileged().</hint>
</question>
-->
<answer id="security-grant">
<p>
No.
</p>
</answer>
<!--
<question id="security-policy" when="final">
Does your functionality require modifications to the standard policy file?
<hint>Your code might pass control to third-party code not
coming from trusted domains. This could be code downloaded over the
network or code coming from libraries that are not bundled