ide/editor.lib2/arch.xml

<?xml version="1.0" encoding="UTF-8"?>
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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="1.29"
  author="mmetelka@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">
<p>
    The Editor Library 2 module is a set of official APIs and SPIs, designed to 
    replaces the original Editor Library with legacy APIs
    that are not properly structured and do not conform to the rules
    implied on the current NB APIs.
</p>

<p>
    The APIs currently offered in Editor Library 2 module include:
</p>

<ul>
<li>
    <api name="editor-code-generator" group="java" type="export" category="official" url="@org-netbeans-modules-editor-lib2@/org/netbeans/spi/editor/codegen/package-summary.html">Code Generator SPI</api>
</li>    
<li>
    <api name="editor-highlighting" group="java" type="export" category="official" url="@org-netbeans-modules-editor-lib2@/org/netbeans/spi/editor/highlighting/package-summary.html">Highlighting SPI</api>
</li>    
<li>
    <api name="editor-typing-hooks" group="java" type="export" category="official" url="@org-netbeans-modules-editor-lib2@/org/netbeans/spi/editor/typinghooks/package-summary.html">Typing Hooks SPI</api>
</li>
<li>
    <api name="editor-caret" group="java" type="export" category="official" url="@org-netbeans-modules-editor-lib2@/org/netbeans/api/editor/caret/package-summary.html">Editor Caret API</api>
</li>
</ul>
</answer>



<!--
        <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>&lt;api type=&quot;export&quot;/></code>
            to describe your general APIs.
            If possible please provide 
            simple diagrams. 
            </hint>
        </question>
-->
<answer id="arch-overall">
The Netbeans editor infrastructure provides an implementation of the Swing Text
package APIs as well as some additional features such as syntax coloring, code
folding, braces matching, etc.
<br/>
</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">
    At the moment the Editor Library 2 module contains distinct APIs/SPIs. They live
    in their own package and the usecases can be found in the packages overview.
    <ul>
    <li>Code Generator SPI -
        <a href="@org-netbeans-modules-editor-lib2@/org/netbeans/spi/editor/codegen/package-summary.html#usecases">org.netbeans.spi.editor.codegen</a>
    </li>
    <li>Highlighting SPI -
        <a href="@org-netbeans-modules-editor-lib2@/org/netbeans/spi/editor/highlighting/package-summary.html#usecases">org.netbeans.spi.editor.highlighting</a>
    </li>
    <li>Typing Hooks SPI -
        <a href="@org-netbeans-modules-editor-lib2@/org/netbeans/spi/editor/typinghooks/package-summary.html#usecases">org.netbeans.spi.editor.typinghooks</a>
    </li>
    <li>Caret API -
        <a href="@org-netbeans-modules-editor-lib2@/org/netbeans/api/editor/caret/package-summary.html#usecases">org.netbeans.api.editor.caret</a>
    </li>
    <li>Caret SPI -
        <a href="@org-netbeans-modules-editor-lib2@/org/netbeans/spi/editor/caret/package-summary.html#usecases">org.netbeans.spi.editor.caret</a>
    </li>
    </ul>
</answer>



<!--
        <question id="arch-quality" when="init">
            How the quality 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">
    Code is accompanied with unit tests.
</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">
    The migration process from the old APIs in Editor Library to the new ones
    in Editor Library 2 is a long task without any clear time frame. We will
    gradually keep deprecating parts of Editor Library and Editor module and
    announce their replacements in the Editor Library 2 or other specialized
    modules.
</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">
  <defaultanswer generate='here' />
 </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 conforms to the Swing Text Package API.
</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">
    Needs at least JRE 1.5.
</answer>



<!-- Question: dep-jrejdk

     <question id="dep-jrejdk">
            Do you require JDK or is JRE enough?
        </question>
-->
<answer id="dep-jrejdk">
    JRE is sufficient.
</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">
    <defaultanswer generate='here'/>
</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">
    None.
</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">
    The module is 100% pure Java and runs on any platform.
</answer>



<!--
        <question id="deploy-dependencies" when="final">
            What do other modules need to do to declare a dependency on this one?
            <hint>
                Provide a sample of the actual lines you would add to a module manifest
                to declare a dependency, for example using OpenIDE-Module-Module-Dependencies
                or OpenIDE-Module-Requires. You may use the magic token @SPECIFICATION-VERSION@
                to represent the current specification version of the module.
            </hint>
        </question>
-->
<answer id="deploy-dependencies">
  Just normal module dependency.
</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">
    No additional files.
</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.
</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">
    Yes, where appropriate.
</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">
    Module can be installed anywhere.
</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">
<p>    
    Yes, the Highlighting SPI recognizes the following client properties that can
    be set on a <code>JTextComponenet</code>.
</p>
  <ul>
  <li>
  <api name="HighlightsLayerIncludes" group="property" category="official" type="export" >
      Defines a regular expression that can be used for filtering out highlighting
      layers used for rendering a text component. If specified, any layer with
      id matching the regular expression <b>will</b> be used for rendering the
      component. By default, when the property is not specified or is <code>null</code>,
      all layers are used. See 
      <a href="@org-netbeans-modules-editor-lib2@/org/netbeans/spi/editor/highlighting/package-summary.html#usecase5">Use case 5.</a>
      for more details.
  </api></li>
  <li>
  <api name="HighlightsLayerExcludes" group="property" category="official" type="export" >
      Defines a regular expression that can be used for filtering out highlighting
      layers used for rendering a text component. If specified, any layer with
      id matching the regular expression <b>will not</b> be used for rendering the
      component. By default, when the property is not specified or is <code>null</code>,
      all layers are used. See 
      <a href="@org-netbeans-modules-editor-lib2@/org/netbeans/spi/editor/highlighting/package-summary.html#usecase5">Use case 5.</a>
      for more details.
  </api></li>
</ul>
</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">
    No.
</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">
    No.
</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">
    No.
</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">
    None. Reading/writing files into editor document is not handled in this module.
</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">
    The module uses <code>MimeLookup</code> for various purposes. The Highlighting
    SPI looks up factories for highlighing layers registered in MimeLookup under
    a mime type of documents that those layer wish to colorify.
</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">
    Yes. There are some implementations of highlighting layers provided by this
    module and they are registered in <code>MimeLookup</code>.
</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 explicit limits. Technically, the available memory size is the limit...
</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">
    One average source file opened in the editor occupies roughly 500KB.
</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">
    Opening a file in the editor can be a long task for large files.
</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">
<p>    
    The number of characters in a file multiplied by 2 to respect
    2 bytes for each unicode character.
</p>
<p>
    Each line is represented by a line element, which takes up about 96 bytes and
    a position object occupying another 48 bytes.
</p>
</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.
</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">
    No.
</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">
    Yes. The module registers a factory for highlighting layers implemented in
    the module.
</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>


<!--
        <question id="exec-introspection">
            Does your module use any kind of runtime type informations (instanceof,
            work with java.lang.Class, 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>



<!--
        <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.
</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>
    Threading model of the EditorDocument adheres to javax.swing.text.Document
    interface. There can be multiple reader threads accessing
    the document simultaneously but only one mutating thread at the time.
    </p>

    <p>
    All the UI-related tasks adhere to Swing/AWT conventions i.e. they
    must be performed in EQ thread.
    </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">
    The infrastructure does not enforce any performance criteria and it's up to
    modules to perform reasonably. On the other hand each SPI defines its threading
    and locking model, which should help modules to understand the constraints
    and impact of their code.
</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">
    No.
 </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
            with NetBeans. Which permissions need to be granted to which domains?</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="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">
     The APIs and SPIs in editor/lib2 module should become offical replacements
     for the legacy editor APIs that do not conform with the Netbeans API standards.
 </answer>



<!--
        <question id="resources-preferences" when="final">
            Does your module uses preferences via Preferences API? Does your module use NbPreferences or
            or regular JDK Preferences ? Does it read, write or both ? 
            Does it share preferences with other modules ? If so, then why ?
            <hint>
                You may use
                <pre xml:space="preserve">
                    &lt;api type="export" group="preferences"
                    name="preference node's absolute path name" category="private" url="http://..."&gt;
                    description of individual keys, where it is used, what it
                    influence, whether the module reads/write it, etc.
                    &lt;/api&gt;            
                </pre>
            </hint>
        </question>
-->
 <answer id="resources-preferences">
     No.
 </answer>

</api-answers>