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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="1.28"
  author="vstejskal@netbeans.org"
>

  &api-questions;


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            What is this project good for?
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<answer id="arch-what">
    The implementation of the <code>MimeDataProvider</code> interface that serves
    data from the folder hierarchy underneath the Editor/ folder on the system
    filesystem.
</answer>


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<answer id="arch-overall">
    
    <p>The module implements <code>MimeDataProvider</code> and registers this implementation
    in the default Lookup via META-INF/services. The implementation relies on
    <code>ProxyLookup</code> and <code>AbsrtactLookup</code> classes, which are used
    for looking up data (i.e. settings, services and other objects) from the
    hierarchy of folders on the system filesystem.
    </p>
    <p>The hierarchy starts in the Editors/ folder and uses subfolders for each
    part of MimePath, for which a user wants to get Lookup. Therefore, when
    asking for Lookup for 'text/x-java' MimePath the lookup will contain objects
    registered underneath the 'Editors/text/x-java' folder.</p>
</answer>


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<answer id="arch-quality">
Unit tests are available.
</answer>


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<answer id="arch-time">
Done.
</answer>


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            to use the module?
        </question>
-->
<answer id="arch-usecases">

<usecase id="known-clients-summary" name="Known clients summary">
<b>Fold Manager Factories</b>
<br/>
The editor/fold module clients are expected to register fold manager factories
(<code>org.netbeans.spi.editor.fold.FoldManagerFactory</code> classes)
in the <b>Editors/&lt;mime-path&gt;/FoldManager</b> layer folder.
<br/>
<br/>
<b>Completion Providers</b>
<br/>
The editor/completion module clients are expected to register completion providers
(<code>org.netbeans.spi.editor.completion.CompletionProvider</code> classes)
in the <b>Editors/&lt;mime-path&gt;/CompletionProviders</b> layer folder.
<br/>
<br/>
<b>Editor Context Menu Actions</b>
<br/>
The editor module clients are expected to register popup menu actions
(<code>javax.swing.Action</code> classes or names of actions
(i.e. value of Action.NAME attribute) present in editor kit e.g. "goto-source")
in the <b>Editors/&lt;mime-path&gt;/Popup</b> layer folder.
<br/>
<br/>
<b>Side Bars</b>
<br/>
The editor/lib module clients are expected to register factories for components
to be placed on the sides of the editor component (<code>org.netbeans.editor.SideBarFactory</code> classes)
in the <b>Editors/&lt;mime-path&gt;/SideBar</b> layer folder.
<br/>
<br/>
<b>Hyperlink Providers</b>
<br/>
The editor/lib module clients are expected to register hyperlink providers
(<code>org.netbeans.lib.editor.hyperlink.spi.HyperlinkProvider</code> classes)
in the <b>Editors/&lt;mime-path&gt;/HyperlinkProviders</b> layer folder.
<br/>
<br/>
<b>Code Template Processors</b>
<br/>
The editor/codetemplates module clients are expected to register factories for
code template processors
(<code>org.netbeans.lib.editor.codetemplates.spi.CodeTemplateProcessorFactory</code> classes)
in the <b>Editors/&lt;mime-path&gt;/CodeTemplateProcessorFactories</b> layer folder.
<br/>
<br/>
<b>Hints Providers</b>
<br/>
The editor/hints module clients are expected to register editor hints providers
(<code>org.netbeans.modules.editor.hints.spi.HintsProvider</code> classes)
in the <b>Editors/&lt;mime-path&gt;/Hints</b> layer folder.
</usecase>

<br/>
<br/>
<br/>
<b>
SPI Use Cases
</b>
<hr/>

<usecase id="declare-mime-type-specific-object-in-layer" name="Declare the mime specific object via xml layer">
This is the simpliest way of declaring, it is suitable for objects stored directly in mime specific
folders:
<pre>
&lt;filesystem&gt;
    &lt;folder name="Editors"&gt;
        &lt;folder name="text"&gt;
            &lt;folder name="x-java"&gt;
                &lt;file name="org-netbeans-modules-editor-mimelookuptest-MimeSpecificObject.instance"/&gt;
            &lt;/folder&gt;
        &lt;/folder&gt;
    &lt;/folder&gt;
&lt;/filesystem&gt;
</pre>

Lookup of this object will look like:
<pre>
MimeLookup lookup = MimeLookup.getMimeLookup("text/x-java");
MimeSpecificObject mso = (MimeSpecificObject) lookup.lookup(MimeSpecificObject.class);
</pre>
</usecase>

<usecase id="declare-mime-type-specific-folder-in-layer" name="Declare the object via xml layer in some specific folder using Class2LayerFolder.">
<p/>
Some objects are connected to some specific folder in mime specific layer folders, e.g.
FoldManagerFactory.class is placed in <b>FoldManager</b>
subfolder in the <b>Editors/&lt;mime-type&gt;/</b>.
Such objects can be registered
to the specific folder using interface <code>Class2LayerFolder</code>.
Let's register FoldManagerFactory.class to <b>FoldManager</b> folder.
First we need to implement the interface:
<pre>
public class FoldManagerClass2LayerFolder implements Class2LayerFolder{
    
    public FoldManagerClass2LayerFolder {
    }
    
    /* declaring the class */
    public Class getClazz(){
        return FoldManagerFactory.class;
    }
    
    /* assigning the declared class to folder */
    public String getLayerFolderName(){
        return "FoldManager";
    }

    /* we will not support InstanceProvider */
    public org.netbeans.spi.editor.mimelookup.InstanceProvider getInstanceProvider() {
        return null;
    }
    
}

</pre>

Then we need to register it to default lookup via META-INF/services registration. We need to create
            a folder structure <code>META-INF/services</code> and place there a file <code>org.netbeans.spi.editor.mimelookup.Class2LayerFolder</code>
            with the content <code>FoldManagerClass2LayerFolder</code>
<p/>
having this we can register appropriate object to specific folder:

<pre>
&lt;filesystem&gt;
    &lt;folder name="Editors"&gt;
        &lt;folder name="text"&gt;
            &lt;folder name="x-java"&gt;
                &lt;folder name="FoldManager"&gt;
                    &lt;file name="org-netbeans-modules-editor-MyFoldManagerFactory.instance"/&gt;
                &lt;/folder&gt;
            &lt;/folder&gt;
        &lt;/folder&gt;
    &lt;/folder&gt;
&lt;/filesystem&gt;
</pre>


Lookup of this object will look like:
<pre>
MimeLookup lookup = MimeLookup.getMimeLookup("text/x-java");
FoldManagerFactory foldManagerFactory =  (FoldManagerFactory) lookup.lookup(FoldManagerFactory.class);
</pre>
or, if there should be more instances of the FoldManagerFactory:
<pre>
MimeLookup lookup = MimeLookup.getMimeLookup("text/x-java");
Collection foldManagerFactories = lookup.lookup(new Lookup.Template(FoldManagerFactory.class)).allInstances();
</pre>

Notice, that the FoldManagerFactory object is found in "FoldManager" folder. It is not necessary for client
of the API to know about some folder structure.
<p/>
</usecase>

<usecase id="mime-lookup-initializer" name="Providing implemented MimeLookupInitializer">
It is the general way of adding mime specific object into the <code>MimeLookup</code>. Implementation of <code>MimeLookupInitializer</code> should be created and
            registered to default lookup via <code>META-INF/services</code> registration.
For details, please look at the simplified 
<code>TestMimeLookupInitializer</code> 
            in <code>mimelookup/test/unit</code> or <code>LayerMimeLookupInitializer</code>.
<b> Usage of MimeLookupInitializer is deprecated, please use MimeDataProvider instead in similar way </b>
</usecase>

<usecase id="instance-provider" name="Using InstanceProvider for declaration of compound folder objects and inheritance">
Demonstration of <code>InstanceProvider</code> and inheritance will be used together in one use case. Example of
editor context menu construction will be used. Each module can register its actions to 
editor context menu via xml layer. As context menu is mime type sensitive (java editor has 
different menu items than plain editor) the actions are registered into mime specific layer folders
to subfolder "Popup". When the context menu is constructing, the xml layer is scanned for the
action items located in the "Popup" subfolder of specific mime folder. In addition to
this there is inheritance mechanism used to share global actions (like Cut, Copy, Paste) over all mime
types context menus, thus not only the action items from actual mime type are considered. All
underlaying mime types are scanned also and the result is context menu with merged action items.
<p/>
For example JSP scriplet context menu should be merged from action items gathered over:
<ol>
<li> Editors/Popup - this is base level for global actions like Cut, Copy, Paste</li>
<li> Editors/text/x-jsp/Popup - items from jsp mime type</li>
<li> Editors/text/x-jsp/text/x-java/Popup - items specific to java scriplet in JSP document</li>
</ol>
<p/>

Construction mechanism is implemented in editor module in NbEditorKit class. The code 
responsible for construction uses MimeLookup and supports also embeded mime-types.
<code>MimeLookup</code> solves embeding and the gathering of the context menu items such simply as:
<p/>
<pre>
MimePath path = MimePath.parse("text/x-jsp/text/x-java");
Lookup lookup = MimeLookup.getLookup(path);
PopupActions actions = (PopupActions) lookup.lookup(PopupActions.class);
List popupActions = actions.getPopupActions();
</pre>

where PopupActions is implementation of <code>InstanceProvider</code> and PopupActions.class needs to be 
registered to "Popup" subfolder using <code>Class2LayerFolder</code> implementation. Let's register
this step by step.
<p/>

Because action items are instances of various objects like:
<ol>
<li>javax.swing.Action</li>
<li>javax.swing.JSeparator</li>
<li>org.openide.util.actions.SystemAction</li>
<li>java.lang.String</li>
</ol>
the <code>InstanceProvider</code> needs to be created for this:

<pre>
public class PopupActions implements InstanceProvider{
    
    List ordered;

    public PopupActions(){
    }
    
    public PopupActions(List ordered){
        this.ordered = ordered;
    }

    public List getPopupActions(){
        List retList = new ArrayList();
        for (int i = 0; i&lt;ordered.size(); i++){
            DataObject dob = (DataObject) ordered.get(i);
            InstanceCookie ic = (InstanceCookie)dob.getCookie(InstanceCookie.class);
            if (ic!=null){
                try{
                    if (String.class.isAssignableFrom(ic.instanceClass()) ||
                        Action.class.isAssignableFrom(ic.instanceClass()) ||
                        SystemAction.class.isAssignableFrom(ic.instanceClass()) ||
                        JSeparator.class.isAssignableFrom(ic.instanceClass())){
                        Object instance = ic.instanceCreate();
                        retList.add(instance);
                    }
                }catch(IOException ioe){
                    ioe.printStackTrace();
                }catch(ClassNotFoundException cnfe){
                    cnfe.printStackTrace();
                }
            } else{
                retList.add(dob.getName());
            }
        }
        return retList;
    }

    public Object createInstance(List ordered) {
        return new PopupActions(ordered);
    }
}

</pre>

This <code>InstanceProvider</code> needs to be declared in <code>Class2LayerFolder</code> implementation:

<pre>
public class PopupInitializer implements Class2LayerFolder{
    
    public PopupInitializer() {
    }
    
    public Class getClazz(){
        return PopupActions.class;
    }
    
    public String getLayerFolderName(){
        return "Popup"; //NOI18N
    }

    public InstanceProvider getInstanceProvider() {
        return new PopupActions();
    }

}

</pre>

Now, we just need to register PopupInitializer into default lookup via META-INF/services 
registration and the initialization is done.

</usecase>


</answer>


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            Is your module correctly internationalized?
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<answer id="compat-i18n">
Yes.
</answer>


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<answer id="compat-standards">
Compatible with standards.
</answer>


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<answer id="compat-version">
No.
</answer>


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<answer id="dep-jre">
JDK1.4 and higher can be used.
</answer>


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<answer id="dep-jrejdk">
JRE is sufficient.
</answer>


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<answer id="dep-non-nb">
No other projects.
</answer>


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<answer id="dep-platform">
All platforms.
</answer>


<answer id="deploy-dependencies">
Nothing.
</answer>


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<answer id="deploy-jar">
No additional files.
</answer>


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<answer id="deploy-nbm">
Yes.
</answer>


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<answer id="deploy-packages">
Yes.
</answer>


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<answer id="deploy-shared">
Anywhere.
</answer>


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<answer id="exec-classloader">
No.
</answer>


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<answer id="exec-component">
No.
</answer>


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<answer id="exec-introspection">
No.
</answer>


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<answer id="exec-privateaccess">
No.
</answer>


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


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<answer id="exec-property">
No.
</answer>


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<answer id="exec-reflection">
No.
</answer>


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<answer id="exec-threading">
No special threading models used.
</answer>


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<answer id="format-clipboard">
No clipboard support.
</answer>


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<answer id="format-dnd">
No D&amp;D.
</answer>


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<answer id="format-types">
No files read or written to the disk.
</answer>


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<answer id="lookup-lookup">
Yes. The module searches for implementations of the <code>Class2LayerFolder</code>
interface in the default Lookup.
</answer>


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            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">
Yes. The module registers an implementation of the <code>MimeDataProvider</code>
interface via META-INF/services in the default Lookup.
</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">
No.
</answer>


<!--
        <question id="perf-exit" when="final">
            Does your module run any code on exit?
        </question>
-->
<answer id="perf-exit">
No.
</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">
No.
</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">
No limits.
</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">
    Not sure.
</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">
No.
</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">
No.
</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">
    The number of Lookups that have been requested for different MimePaths and
    the number of objects (i.e. settings, services, etc.) registered in those
    lookups.
</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 quickly and will not
            negatively influence the performance of your own module?
            </hint>
        </question>
-->
<answer id="perf-spi">
    The clients code is not enforced in any way to perform well. However, the
    implementation of the module uses caching and lazy loading wherever it is
    possible to minimize the number of objects loaded in memory.
</answer>


<!--
        <question id="perf-startup" when="final">
            Does your module run any code on startup?
        </question>
-->
<answer id="perf-startup">
No.
</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">
No.
</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">
Only in tests.
</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">
No. 
</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">
No.
</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">
Yes. 

<api group="layer" name="EditorsRegistry" type="export" category="official">
The module expects all mime type sensitive settings to be
placed in the subfolders hierarchy under the "Editors" folder on the default filesystem.
</api>
</answer>


<!--
        <question id="security-grant" when="final">
            Does your code grant addition rights to some code?
            <hint>Avoid using a classloder that adds some extra
            permissions to loaded code unless realy necessary.
            Also note that your API implementation
            can also expose unneeded permissions to enemy code by
            AccessController.doPrilileged() calls.</hint>
        </question>
-->
<answer id="security-grant">
No.
</answer>


<!--
        <question id="security-policy" when="final">
            Does your functionality require standard policy file modification?
            <hint>Your code may pass control to third party code not
            coming from trusted domain. It covers code downloaded over
            network or code coming from libraries that are not bundled
            with NetBeans. Which permissions it needs to grant to which domain?</hint>
        </question>
-->
<answer id="security-policy">
No.
</answer>


<!--
        <question id="exec-ant-tasks" when="impl">
            Do you define or register any ant tasks that other can use?
            
            <hint>
            If you provide an ant task that users can use, you need to be very
            careful about its syntax and behaviour, as it most likely forms an
	          API for end users and as there is a lot of end users, their reaction
            when such API gets broken can be pretty strong.
            </hint>
        </question>
-->
<answer id="exec-ant-tasks">
No.
</answer>

<!--
        <question id="arch-where" when="init">
            Where one can find sources for your module?
            <hint>
                Please provide link to the CVS web client at
                http://www.netbeans.org/download/source_browse.html
                or just use tag defaultanswer generate='here'
            </hint>
        </question>
-->
 <answer id="arch-where">
    Sources can be found in editor/mimelookup/impl module.
 </answer>


<!--
        <question id="compat-deprecation" when="init">
            How the introduction of your project influences functionality
            provided by previous version of the product?
            <hint>
            If you are planning to deprecate/remove/change any existing APIs,
            list them here accompanied with the reason explaining why you
            are doing so.
            </hint>
        </question>
-->
<answer id="compat-deprecation">
    As the module's API/SPI has been naturaly evolving over the time the module contains
    several deprecated classes. All of them are still fully supported and the
    module remains backward compatible.
</answer>

</api-answers>