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-->
<!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="1.12"
  module="Filesystems"
  author="rmatous@netbeans.org"
>

  &api-questions;


<!-- Question: arch-what

     <question id="arch-what">
            What is this project good for?
            <hint>
            Please provide here few lines describing the the project, 
            what problem it should solve, provide links to documentation, 
            specifications, etc.
            </hint>
        </question>
-->
<answer id="arch-what">
The Filesystems API provides a common API to access files in a uniform manner. 
It is available as standalone library and
also is bundled together with other parts of the openide. 
<a href="@TOP@/org/openide/filesystems/doc-files/api.html">Specification</a>
</answer>



<!-- Question: compat-i18n

     <question id="compat-i18n">
            Is your module correctly internationalized?
            <hint>
            Correct internationalization means that it obeys instuctions 
            at <a href="http://www.netbeans.org/devhome/docs/i18n/index.html">
            NetBeans I18N pages</a>.
            </hint>
        </question>
-->
<answer id="compat-i18n">
Yes.
</answer>



<!-- Question: compat-standards

     <question id="compat-standards">
            Does the module implements or defines any standards? Is the 
            implementation exact or it deviates somehow?
        </question>
-->
<answer id="compat-standards">
It defines and implements the 
<api 
    name="FilesystemsAPI" type="export" category="official" 
    url="@TOP@/org/openide/filesystems/doc-files/api.html"
    group="java" 
/> 
</answer>



<!-- Question: compat-version

     <question id="compat-version">
            Does your module properly coexists with earlier and future
            versions? Can you correctly read settings? Will future
            versions be able to read settings?
            
            <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">
Yes.
</answer>



<!-- Question: dep-jre

     <question id="dep-jre">
            Which version of JRE 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">
JRE 1.3.
</answer>



<!-- Question: dep-jrejdk

     <question id="dep-jrejdk">
            Do you require JDK or is JRE enough?
        </question>
-->
<answer id="dep-jrejdk">
JRE is enough.
</answer>



<!-- Question: dep-nb

     <question id="dep-nb">
            What other NetBeans projects this one depends on?
            <hint>
            If you want, describe such projects as imported API using
            the <code>&lt;api name="identification" type="import or export" category="stable" url="where is the description" /&gt;</code>
            </hint>
        </question>
-->
<answer id="dep-nb">
<ul>
    <li><api 
        name="UtilitiesAPI"
        group="java"
        type="import"
        category="official"
        url="@org-openide-util@/org/openide/util/doc-files/api.html"
    /></li>
    <li><api 
        name="LookupAPI"
        group="java"
        type="import"
        category="official"
        url="@org-openide-util@/org/openide/util/doc-files/api.html#lookup"
    /></li>    
</ul>
</answer>



<!-- Question: dep-non-nb

     <question id="dep-non-nb">
            What other non-NetBeans projects this one depends on?
            
            <hint>
            Some non-NetBeans projects are packaged as NetBeans modules
            (see <a href="http://libs.netbeans.org">libraries</a>) and
            it is prefered to use this approach when more modules may
            depend on such third-party library.
            </hint>
        </question>
-->
<answer id="dep-non-nb">
SAX parser is used to parse layers  and attributes in .nbattrs files.
</answer>



<!-- Question: dep-platform

     <question id="dep-platform">
            On which platforms your module run? Any? Does it run in the same
            way?
            <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">
Platform independent. But filesystem impl. on OS must satisfy usual naming conventions.
</answer>



<!-- Question: deploy-jar

     <question id="deploy-jar">
            Do you deploy just module JAR file(s) or some other files?
            <hint>
            If your module consist just from one module JAR file, just confirm that.
            If it uses more than one JAR, describe where there 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/deinstallation leaves the system 
            in state as it was before installation.
            </hint>
        </question>
-->
<answer id="deploy-jar">
Filesystems API and SPI  is part of  <samp>openide.jar</samp>. 
</answer>



<!-- Question: deploy-nbm

     <question id="deploy-nbm">
            Can you deploy NBM via AutoUpdate center?
            <hint>
            If not why?
            </hint>
        </question>
-->
<answer id="deploy-nbm">
Yes (<samp>openide.nbm</samp>).
</answer>



<!-- Question: deploy-packages

     <question id="deploy-packages">
            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/apis/org/openide/doc-files/upgrade.html#3.4-public-packages">
            public packages
            </a>). 
            </hint>
        </question>
-->
<answer id="deploy-packages">
No.
</answer>



<!-- Question: deploy-shared

     <question id="deploy-shared">
            Do you need to be installed in shared location or only in user directory?
            <hint>
            Installation location shall not matter, if it does explain why.
            </hint>
        </question>
-->
<answer id="deploy-shared">
As part of openide.jar needs to be in the system directory. 
</answer>

<!--
        <question id="exec-introspection">
            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">
No answer
</answer>

<!--
        <question id="exec-process">
            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">
No external process.
</answer>


<!-- Question: exec-classloader

     <question id="exec-classloader">
            Does your code uses own classloader?
            <hint>
            A bit unusual. Please explain why and what for.
            </hint>
        </question>
-->
<answer id="exec-classloader">
No.
</answer>



<!-- Question: exec-component

     <question id="exec-component">
            Is execution of your code influenced by (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 behaviour 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">
No.
</answer>



<!-- Question: exec-privateaccess

     <question id="exec-privateaccess">
            Are you aware of any other part 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">
Yes, AutomountSupport stores content of Repository as settings files. Then setting infrastructure registers its 
own PropertyChangeListener. So method addPropertyChangeListener is invoked by reflection.
</answer>



<!-- Question: exec-property

     <question id="exec-property">
            Is execution of your code influenced by any environment of
            system (<code>System.getProperty</code>) property?
            
            <hint>
            If there is a property that can change the behaviour of your 
            code, somebody will likely use it. You should describe what it does 
            and the stability category of this API. You may use
            <PRE>
                &lt;property name="id" category="private" &gt;
                    description of the property, where it is used, what it influence, etc.
                &lt;/property&gt;            
            </PRE>
            </hint>
        </question>
-->
<answer id="exec-property">
<ul>
<li>
<api type="export" group="property" name="org.openide.filesystems.DefaultAttributes.ATTR_NAME_EXT_XML" category="private">
 Name of  attribute file can be changed , if .nbattrs can't be used. 
 </api></li>
 <li><api type="import" group="property" name="netbeans.debug.heap" category="private">
Periodic refresh can be blocked.
 </api></li>
 <li><api type="export" group="property" name="org.openide.filesystems.LocalFileSystem.REFRESH_TIME" category="private">
Periodic refresh can be set.
 </api></li>
  <li>
   <api type="export" group="property" name="org.openide.filesystems.annotateUnclosedStreams" category="private">
    <p>
     If <code>true</code>, better diagnostic information will be available as to when file input or
     output streams were opened that prevent a file from being deleted because they were not closed.
     This information comes at a performance cost, however.
    </p>
   </api>
  </li>
 </ul>
</answer>



<!-- Question: exec-reflection

     <question id="exec-reflection">
            Does your code uses java.lang.reflect to execute some other code?
            <hint>
            This usually indicates a missing or unsufficient 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">
Yes, attributes can contain also dynamic values associated with keys (<code>methodvalue</code> and <code>newvalue</code>).
<ul>
<li><a href="http://www.netbeans.org/dtds/attributes-1_0.dtd"><code>"-//NetBeans//DTD DefaultAttributes 1.0//EN"</code></a></li>
<li><a href="http://www.netbeans.org/dtds/filesystem-1_0.dtd"><code>"-//NetBeans//DTD Filesystem 1.0//EN"</code></a></li>           
</ul>
 </answer>



<!-- Question: format-clipboard

     <question id="format-clipboard">
            Which protocols your code reads/inserts when communicating with
            clipboard?
        </question>
-->
<answer id="format-clipboard">
None.
</answer>



<!-- Question: format-dnd

     <question id="format-dnd">
            Which protocols your code understands during drag-n-drop?
        </question>
-->
<answer id="format-dnd">
None.
</answer>



<!-- Question: format-types

     <question id="format-types">
            Which file formats your code reads or writes on disk?
        </question>
-->
<answer id="format-types">
<ul>
<li><api group="dtd" category="stable" type="export" name="attributes-1_0.dtd" url="http://www.netbeans.org/dtds/attributes-1_0.dtd"><samp>-//NetBeans//DTD DefaultAttributes 1.0//EN</samp></api></li>
<li><api group="dtd" category="stable" type="export" name="filesystem-1_0.dtd" url="http://www.netbeans.org/dtds/filesystem-1_0.dtd"><samp>-//NetBeans//DTD Filesystem 1.0//EN</samp></api></li>
</ul>
</answer>



<!-- Question: lookup-lookup

     <question id="lookup-lookup">
            Does your module uses <code>org.openide.util.Lookup</code>
            to find any components to communicate to? 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 clasify the stability of such
            API contract.
            </hint>
        </question>
-->
<answer id="lookup-lookup">
Implementations of MIMEResolver and URLMapper are looked up .
</answer>



<!-- Question: lookup-register

     <question id="lookup-register">
            Do you register anything into the lookup for other 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">
No
</answer>



<!-- Question: lookup-remove

     <question id="lookup-remove">
            Are removing entries of other modules from the 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">
No.
</answer>



<!-- Question: perf-exit

     <question id="perf-exit">
            Does your module executes anything on exit?
        </question>
-->
<answer id="perf-exit">
No.
</answer>



<!-- Question: perf-huge_dialogs

     <question id="perf-huge_dialogs">
            Does your module contain any dialogs or wizards with huge
            amount of GUI controls like combo boxes, lists, trees, text
            areas?
        </question>
-->
<answer id="perf-huge_dialogs">
No.
</answer>



<!-- Question: perf-limit

     <question id="perf-limit">
            Are there any limits in number/size of elements your code
            can handle?
        </question>
-->
<answer id="perf-limit">
No.
</answer>



<!-- Question: perf-mem

     <question id="perf-mem">
            What is the amount of memory your component occupies? Estimate
            with a relaction to the number of windows, etc.
        </question>
-->
<answer id="perf-mem">
Hardly to estimate, depends on many factors.  Instances of FileObject
 can be kept weak or hard, implementatins of FileObject may differ each other.
Approximately for FileObject that comes
 from AbstractFileSystem impl. probably 100 B if  size of name is average .  
</answer>



<!-- Question: perf-menus

     <question id="perf-menus">
            Does your module use dynamically changing context menus or
            context sensitive actions with complicated logic for enable/disable?
        </question>
-->
<answer id="perf-menus">
No.
</answer>



<!-- Question: perf-progress

     <question id="perf-progress">
            Does your module executes some long running task?
            <hint>Typically they are tasks like connecting over
            network, computing huge amount of data, compilation.
            Such communication should be done asynchronously (for example
            using <code>RequestProcessor</code>), definitively it should 
            not block AWT thread.
            </hint>
        </question>
-->
<answer id="perf-progress">
There are no such long running tasks except refresh operation, that  may be time consuming. 
Naturally also operations on FileSystem, that access remote files over network. 
</answer>



<!-- Question: perf-scale

     <question id="perf-scale">
            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?
            Please include some estimates.
        </question>
-->
<answer id="perf-scale">
As far as I know the code scales linearily.
</answer>



<!-- Question: perf-startup

     <question id="perf-startup">
            Does your module executes anything on startup?
        </question>
-->
<answer id="perf-startup">
No.
</answer>



<!-- Question: perf-wakeup

     <question id="perf-wakeup">
            Is any piece of your code waking up periodically?
        </question>
-->
<answer id="perf-wakeup">
No. Periodic refresh is disabled at the moment as default.
</answer>



<!-- Question: resources-file

     <question id="resources-file">
            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 prefered
            way that should be used. But of course there can be situations when
            this is not suitable.
            </hint>
        </question>
-->
<answer id="resources-file">
Yes, naturally.
</answer>



<!-- Question: resources-layer

     <question id="resources-layer">
            Does your module provide own layer? Does it create some files or
            folders on it? What it is trying to communicate by that and with which 
            component?
            
            <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">
No.
</answer>



<!-- Question: resources-mask

     <question id="resources-mask">
            Does your module mask/hide/override any resource provided by another one in
            module layer? 
            
            <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">
No.
</answer>



<!-- Question: resources-read

     <question id="resources-read">
            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 clasify according to 
            <a href="http://openide.netbeans.org/tutorial/api-design.html#categories">
            common stability categories</a>.
            </hint>
        </question>
-->
<answer id="resources-read">
No.
</answer>

</api-answers>
