arch.xml

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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="tball@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>&lt;api type="export"/&gt;</code>
            to describe your general APIs.
            If possible please provide 
            simple diagrams. 
            </hint>
        </question>
-->
 <answer id="arch-overall">
  <p>
    <api name="classfile"
         group="java"
         type="export"
         category="stable">
    </api>
   The ClassFile library is an API to read Java classfiles, as described by
   <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/index.html">
   The Java Virtual Machine Specification</a>.  Given a file or stream reference to a Java
   classfile, the API provides read-only access to all of its class attributes, including 
   type information, methods and fields, generics support (if any), etc.
   <br/>
   NOTE:  this library is not really a NetBeans module, in that it doesn't have any NetBeans references.
   It therefore has nothing pluggable, no NetBeans Lookups, and is not extensible.
  </p>
 </answer>



<!--
        <question id="arch-quality" when="init">
            How will the <a href="http://www.netbeans.org/community/guidelines/q-evangelism.html">quality</a>
            of your code be tested and 
            how are future regressions going to be prevented?
            <hint>
            What kind of testing do
            you want to use? How much functionality, in which areas,
            should be covered by the tests? 
            </hint>
        </question>
-->
 <answer id="arch-quality">
  <p>
   The ClassFile API is heavily used by the clazz and javacore modules, so that any
   new bugs are normally reflected in those modules' test suites.  There currently (as 
   of the 4.0 freeze date) are no outstanding bugs.
  </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 by which the work should be 
            ready?
            </hint>
        </question>
-->
 <answer id="arch-time">
  <p>
   N/A; already implemented.
  </p>
 </answer>



<!--
        <question id="arch-usecases" when="init">
            <hint>
                Content of this answer will be displayed as part of page at
                http://www.netbeans.org/download/dev/javadoc/usecases.html 
                You can use tags &lt;usecase name="name&gt; regular html description &lt;/usecase&gt;
                and if you want to use an URL you can prefix if with @TOP@ to begin
                at the root of your javadoc
            </hint>
        
            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 under
            what circumstances? What kind of code would typically need to be written
            to use the module?
        </question>
-->
 <answer id="arch-usecases">
  <p>
   The normal usecase is for a client wanting to inspect a classfile.  A <code>ClassFile</code> 
   instance is created with either a <code>String</code> path, <code>File</code> or 
   <code>InputStream</code> instance.  All attributes of the classfile are available as properties,
   such as <code>getSourceFileName</code> or <code>getMethods</code>.
  </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>
   The ClassFile API is designed as a fast, low memory-cost way to access classfile
   information.  It is useful for tools and modules that directly read classfiles,
   such as the clazz and javacore modules.
  </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>
   The Module names have been internationalized.  The only hard-coded strings in the library are either
   Java language keywords, JVM attribute names, toString fragments, and exception descriptions.  All of
   these are marked with "//NOI18N" comments.
  </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>
   The module depends upon the <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/index.html">
   The Java Virtual Machine Specification</a>.  It does not implement or define any standards, however.
  </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>
   N/A; the classfile module has no settings or other persistent data.
  </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>
   The classfile module now depends on the 1.4 JRE, since it uses assert statements.
   Although this library can read 1.5 classfiles, it does not use any API from that
   JRE.
  </p>
 </answer>



<!--
        <question id="dep-jrejdk" when="final">
            Do you require the JDK or is the JRE enough?
        </question>
-->
 <answer id="dep-jrejdk">
  <p>
   The JDK is not required; the JRE is enough.
  </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 APIs 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">
  <p>
   The classfile module has no dependencies on any NetBeans module or API.
  </p>
 </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>
   The classfile module has no dependencies on any other project.
  </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>
   The classfile module is platform-independent.
  </p>
 </answer>



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



<!--
        <question id="deploy-jar" when="impl">
            Do you deploy just module JAR file(s) or other files as well?
            <hint>
            Usually a module consist of one JAR file (perhaps with Class-Path
            extensions) and also a configuration file that enables it. If you
            have any other files, use
            &lt;api group="java.io.File" name="yourname" type="export" category="friend"&gt;...&lt;/api&gt;
            to define the location, name and stability of your files (of course
            changing "yourname" and "friend" to suit your needs).
            
            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>
   Just the module jar is deployed.
  </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>
   No.
  </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>
   Installation location does not matter.
  </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>
                &lt;api type="export" group="property" name="id" category="private" url="http://..."&gt;
                    description of the property, where it is used, what it influence, etc.
                &lt;/api&gt;            
            </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>
   The ClassFile API creates invariant objects, which should be safe in any threading model.
  </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>
   N/A; the classfile module has no user interface.
  </p>
 </answer>



<!--
        <question id="format-dnd" when="impl">
            Which protocols (if any) does your code understand during Drag &amp; 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>
   N/A; the classfile module has no user interface.
  </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>
   It reads Java classfiles.
  </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. For that use &lt;api group=&amp;lookup&amp; /&gt; tag.
            </hint>
        </question>
-->
 <answer id="lookup-lookup">
  <p>
   The classfile module does not use Lookup.
  </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">
  <p>
   N/A
  </p>
 </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>
   N/A
  </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>
   No.
  </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, other than the limits defined for classfiles in 
   <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/index.html">
   The Java Virtual Machine Specification</a>.
  </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>
   It depends on the size and complexity of the classfile being represented.  ClassFile
   representations can be roughly 7-10 times the size of the associated classfile, but
   much smaller (2-4x) if the <code>includeCode</code> constructor parameter is false.
  </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>
   None, other than general filesystem and processor performance.
  </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 quickly and will not
            negatively influence the performance of your own module?
            </hint>
        </question>
-->
 <answer id="perf-spi">
  <p>
   N/A
  </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>
   Yes, because the classfile module has no NetBeans API dependencies.
  </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>
   No.
  </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>
   No.
  </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
            with NetBeans. Which permissions need to be granted to which domains?</hint>
        </question>
-->
 <answer id="security-policy">
  <p>
   No policy file modifications needed. All permissions granted.
  </p>
 </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 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">
  <p>
   No.
  </p>
 </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">
  <p>
   No impact on other API.
  </p>
 </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">
  <p>
   No.
  </p>
 </answer>

</api-answers>