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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="1.25"
  author="mkleint@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">
  <ul>
   <li>
    <api group="java" name="MavenProjectAPI" type="export" category="friend">
     <p> 
      The Maven Project API provides some miscellaneous friend APIs and SPIs relating to 
      Maven projects.
     </p>
    </api>
   </li>
  </ul>
 </answer>


<!--
        <question id="arch-usecases" when="init">
            Describe the main <a href="http://openide.netbeans.org/tutorial/api-design.html#usecase">
            use cases</a> of the new API. Who will use it at
            what circumstances and what will be the typical code to write
            to use the module.
        </question>
-->
 <answer id="arch-usecases">
  <p>
     API/SPI to be used by modules wanting to enhance the maven project's integration in the IDE. 
  </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">
    <api group="layer" name="MavenProjectCustomizer" type="export" category="official">
     <p>
       "Projects/org-netbeans-modules-maven/Customizer" folder's content is used to construct the project's customizer.
       It's content is expected to be <code>ProjectCustomizer.CompositeCategoryProvider</code> instances.
       The lookup passed to the panels contains an instance of <code>Project</code> and <code>org.netbeans.modules.maven.api.customizer.ModelHandle</code>
       Please note that the latter is not part of any public APIs and you need friend dependency to make use of it.
     </p>
    </api>
    <api group="layer" name="MavenLogicalViewProvider" type="export" category="official">
     <p>
       "Projects/org-netbeans-modules-maven/Nodes" folder's content is used to construct the project's child nodes.
       It's content is expected to be <code>NodeFactory</code> instances.
     </p>
    </api>
    <api group="layer" name="MavenLookup" type="export" category="official">
     <p>
       "Projects/org-netbeans-modules-maven/Lookup" folder's content is used to construct the project's additional lookup.
       It's content is expected to be <code>LookupProvider</code> instances. Maven project provides <code>LookupMerger</code>s
       for <code>Sources</code>, <code>PrivilegedTemplates</code>, <code>RecommendedTemplates</code> and other classes. Implementations added by 3rd parties
       will be merged into a single instance in the project's lookup.
     </p>
    </api>
    <api group="layer" name="MavenPackagingLookup" type="export" category="devel">
        <p>
            <code>Projects/org-netbeans-modules-maven/&lt;packaging-type>/Lookup</code> is added to the project's additional Lookup. The content is expected
            to contain packaing-specific services and processors, for example, <a href="@TOP@/org/netbans/modules/maven/api/execute/PrerequisitesChecker.html">PrerequisitesCheckers</a>.
            In addition, <code>Projects/org-netbeans-modules-maven/_any/Lookup</code> defines services that act after the packaging-specific ones.
        </p>
        For the details and examples, see description in <a href="@TOP@/org/netbeans/modules/maven/api/execute/PrerequisitesChecker.html">PrerequisitesChecker javadoc</a>.
    </api>
    <api group="layer" name="PluginLookup" type="export" category="official">
     <p>
       Technology-related services can be registered so they activate in a project that has configured a specific Maven plugin. Such services should
       be placed in <code>Projects/org-netbeans-modules-maven/&lt;plugin-id>/Lookup</code> folder. Maven core module will plug these providers in
       as soon as the plugin-id appears in the POM model, and will remove them from project's Lookup when the plugin is no longer part of the project's model.
       See <a href="@TOP@/org/netbeans/modules/maven/api/NbMavenProject.html">NbMavenProject javadoc for details/examples</a>.
     </p>
    </api>
    <api group="layer" name="MavenActions" type="export" category="official">
     <p>
       "Projects/org-netbeans-modules-maven/ProjectActions", 
       "Projects/org-netbeans-modules-maven/DependenciesActions" and 
       "Projects/org-netbeans-modules-maven/DependencyActions" folders' content is used to
       add item's to node popup. To main project node, Dependencies node and node for single dependency.
       It's content is expected to be <code>Action</code> instances.
     </p>
    </api>
    <api group="layer" name="LifecycleParticipants" type="export" category="official">
     <p>
         A module can disable warning for a custom lifecycle participant by creating a <b>folder</b> in 
         <code>Projects/org-netbeans-modules-maven/LifecycleParticipant</code>. Currently single boolean attribute,
         <code>ignoreOnModelLoad</code> is supported, which suppresses project problem and warning about
         the custom participant. The participant's code does not run after project load.         
     </p>
    </api>

    <api group="layer" name="MavenArchetypes" type="export" category="official">
     <p>
       "Projects/org-netbeans-modules-maven/Archetypes" folder contains fileobjects
       that represent archetypes. The archetypes are defined by the following file attributes:
     </p>
       <table>
           <tbody>
               <tr><td>groupId</td><td>mandatory</td><td></td></tr>
               <tr><td>artifactId</td><td>mandatory</td><td></td></tr>
               <tr><td>version</td><td>mandatory</td><td></td></tr>
               <tr><td>repository</td><td>optional</td><td>url of the archetype's repository</td></tr>
               <tr><td>nameBundleKey</td><td>optional</td><td>key in bundle file that holds localized name</td></tr>
               <tr><td>descriptionBundleKey</td><td>optional</td><td>key in bundle file that holds localized description</td></tr>
           </tbody>
       </table>
    </api>
    
    <api group="lookup" name="ActionConfiguration" type="import" category="official">
        <p>
            Project API clients may place <a href="@org-netbeans-modules-projectapi@/org/netbeans/spi/project/ProjectConfiguration.html">ProjectConfiguration</a> 
            instance in the <b>context Lookup</b> passed to <a href="@org-netbeans-modules-projectapi@/org/netbeans/spi/project/ActionProvider.html##isActionEnabled-java.lang.String-org.openide.util.Lookup-">ActionProvider.isActionEnabled()</a> or 
            <a href="@org-netbeans-modules-projectapi@/org/netbeans/spi/project/ActionProvider.html##invokeAction-java.lang.String-org.openide.util.Lookup-">ActionProvider.invokeAction()</a>. If such instance is present, the action is configured according to settings in the selected configuration.
            If not present, the active configuration is used. See example in <a href="@TOP@/org/netbeans/modules/maven/api/NbMavenProject.html">NbMavenProject</a> documentation.
        </p>
    </api>

 </answer>


 <answer id="exec-property">
  <p>
      <api category="devel" group="property" name="netbeans.ignore.jdk.bootclasspath" type="export">
          The maven support recognizes special tag in <q>maven-compiler-plugin</q> configuration
          that instructs the IDE to <em>not</em> put JDK libraries on a classpath. One can use:<pre>
    &lt;plugin&gt;
        &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
        &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
        &lt;configuration&gt;
            &lt;compilerArguments&gt;
                &lt;bootclasspath&gt;netbeans.ignore.jdk.bootclasspath&lt;/bootclasspath&gt;
            &lt;/compilerArguments&gt;
        &lt;/configuration&gt;
    &lt;/plugin&gt;
          </pre>
          section in <code>pom.xml</code> to <em>suppress</em> the JDK libraries.
      </api>
  </p>
  <p>
      <api category="devel" group="systemproperty" name="org.netbeans.modules.maven.execute.AbstractOutputHandler.SLEEP_DELAY" type="export">
          A system property can be used to change the default indexing sleep delay during builds,
          in case reparsing starts too soon (wasting CPU) or too late (impeding editing).
      </api>
  </p>
  
  <p>
      <api category="devel" group="branding" name="org.netbeans.modules.maven.options.DEFAULT_REUSE_OUTPUT" type="export">
          Brand the <code>DEFAULT_REUSE_OUTPUT</code> key in a 
          <code>org.netbeans.modules.maven.options.Bundle</code> file
          with one of the values <code>true</code> or <code>false</code>
          to specify the default behavior of reusing output by your application.
          Use <code>never</code> value, if the reuse shall never be done,
          regardless of the settings value.
      </api> 
      <api category="devel" group="branding" name="org.netbeans.modules.maven.api.execute.DEFAULT_COMPILE_ON_SAVE" type="export">
          Brand the <code>DEFAULT_COMPILE_ON_SAVE</code> key in a 
          <code>org.netbeans.modules.maven.api.execute.Bundle</code> file
          with one of the values <code>all</code> or <code>none</code>
          to specify the default behavior of compile on save in Maven 
          projects.
      </api> 
      <api category="stable" group="property" name="exec.vmArgs" type="export">
          The plugin exports Java VM parameters to be used for application execution in <code>${exec.vmArgs}</code> 
          property that can be used in action mappings or Maven pom.xml.
      </api>
      <api category="stable" group="property" name="exec.appArgs" type="export">
          The plugin exports application parameters to be used for application execution in <code>${exec.appArgs}</code> 
          property that can be used in action mappings or Maven pom.xml.
      </api>
      <api category="private" group="property" name="NbIde." type="export">
          Properties designed to be read only by NB IDE code, and <b>not passed</b> to Maven can be prefixed by this prefix.
          Maven module uses such properties to communicate between services that participate on maven launch internally.
      </api>
      <api category="devel" group="lookup" name="ExplicitProcessParameters" type="export">
          Project actions that execute user application (run, debug) accept additional VM and application
          arguments as a series of <a href="@org-netbeans-modules-extexecution-base@/org/netbeans/api/extexecution/base/ExplicitProcessParameters.html">
            ExplicitProcessParameters</a> instance(s) in the action's Lookup. See <a href="@org-netbeans-modules-extexecution-base@/org/netbeans/api/extexecution/base/ExplicitProcessParameters.html">
            ExplicitProcessParameters</a> javadoc for more details.
      </api>
      <api category="devel" group="branding" name="org.netbeans.modules.maven.indexer.api.DEFAULT_CREATE_INDEX" type="export">
          Brand the <code>DEFAULT_CREATE_INDEX</code> key in
          <code>org.netbeans.modules.maven.indexer.api.Bundle</code> file
          with one of the values <code>true</code> or <code>false</code>
          to control (usually to disable with <code>DEFAULT_CREATE_INDEX=false</code>)
          the default behavior automatic maven index downloading.
      </api> 
      <api category="devel" group="branding" name="org.netbeans.modules.maven.indexer.api.DEFAULT_UPDATE_FREQ" type="export">
          Brand the <code>DEFAULT_UPDATE_FREQ</code> key in
          <code>org.netbeans.modules.maven.indexer.api.Bundle</code> file
          with one of the values:
          <ul>
              <li><code>0</code> - once a week</li>
              <li><code>1</code> - once a day</li>
              <li><code>2</code> - on each startup</li>
              <li><code>3</code> - never</li>
          </ul>
          to control (usually to disable with <code>DEFAULT_UPDATE_FREQ=3</code>)
          the default behavior automatic maven index downloading.
      </api> 
  </p>
  
 </answer>
 
 <answer id="resources-file">
     <p>
         <api category="stable" group="java.io.File" name="nbactions.xml" type="export">
             <p>
                NetBeans Maven support recognizes special file(s) that can be placed
                next to a <code>pom.xml</code>. These files contain description of 
                bindings between NetBeans UI actions (compile, run, debug, etc.) and
                the actual Maven goals to execute.
             </p>
             <p>
                 Primary name of the file is <code>nbactions.xml</code>. In
                 addition to this, there can be other <code>nbactions-profile.xml</code>
                 where profile is the name of a Maven profile. These files are
                 active when such profile is choosen as a selected 
                 project configuration. The sample format of the file follows:
             </p>
             <pre>
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;actions&gt;
    &lt;action&gt;
        &lt;actionName&gt;run&lt;/actionName&gt;
        &lt;goals&gt;
            &lt;goal&gt;process-classes&lt;/goal&gt;
            &lt;goal&gt;exec:java&lt;/goal&gt;
        &lt;/goals&gt;
    &lt;/action&gt;
    &lt;action&gt;
        &lt;actionName&gt;debug&lt;/actionName&gt;
        &lt;goals&gt;
            &lt;goal&gt;process-classes&lt;/goal&gt;
            &lt;goal&gt;exec:java&lt;/goal&gt;
        &lt;/goals&gt;
        &lt;properties&gt;
            &lt;jpda.listen&gt;maven&lt;/jpda.listen&gt;
        &lt;/properties&gt;
    &lt;/action&gt;
    &lt;action&gt;
        &lt;!-- this action is shown in 'Custom' submenu of project popup menu --&gt;
        &lt;actionName&gt;CUSTOM-bck2brwsr-show&lt;/actionName&gt;
        &lt;displayName&gt;Run in a Browser&lt;/displayName&gt;
        &lt;goals&gt;
            &lt;goal&gt;clean&lt;/goal&gt;
            &lt;goal&gt;package&lt;/goal&gt;
            &lt;goal&gt;bck2brwsr:show&lt;/goal&gt;
        &lt;/goals&gt;
        &lt;activatedProfiles&gt;
            &lt;activatedProfile&gt;bck2brwsr&lt;/activatedProfile&gt;
        &lt;/activatedProfiles&gt;
        &lt;properties&gt;
            &lt;skipTests&gt;true&lt;/skipTests&gt;
        &lt;/properties&gt;
    &lt;/action&gt;
    &lt;!-- the profiles section is only useful in nbactions.xml 
        and gets activated when profile of given id is choosen in the UI
        --&gt;
    &lt;profiles&gt;
        &lt;profile&gt;
            &lt;id&gt;bck2brwsr&lt;/id&gt;
            &lt;!-- changes meaning of run action when bck2brwsr profile
                 is selected
            --&gt;
            &lt;actions&gt;
                &lt;action&gt;
                    &lt;actionName&gt;run&lt;/actionName&gt;
                    &lt;displayName&gt;Run in a Browser&lt;/displayName&gt;
                    &lt;goals&gt;
                        &lt;goal&gt;clean&lt;/goal&gt;
                        &lt;goal&gt;package&lt;/goal&gt;
                        &lt;goal&gt;bck2brwsr:show&lt;/goal&gt;
                    &lt;/goals&gt;
                    &lt;activatedProfiles&gt;
                        &lt;activatedProfile&gt;bck2brwsr&lt;/activatedProfile&gt;
                    &lt;/activatedProfiles&gt;
                    &lt;properties&gt;
                        &lt;skipTests&gt;true&lt;/skipTests&gt;
                    &lt;/properties&gt;
                &lt;/action&gt;
            &lt;/actions&gt;
        &lt;/profile&gt;
    &lt;/profiles&gt;
&lt;/actions&gt;
             </pre>
             <p>
             If an action is not found in currently selected &lt;profile&gt;
             section, the system fallbacks to the main list of actions. In
             the previous example, the debug action would be taken from main
             list for all the profiles.    
             </p>
         </api>
         <api category="stable" group="property" name="jpda.attach" type="export">
             <p>
             One can define following code in nbactions.xml file to start
             a process during goal execution and attach a debugger to it
             once the execution is over. Here is an example using
             <a onclick="target='_blank'" href="https://github.com/simpligility/android-maven-plugin/pull/584">enhancement</a>
             in the Maven Android plugin:
             </p>
<pre>
&lt;action&gt;
    &lt;actionName&gt;debug&lt;/actionName&gt;
    &lt;goals&gt;
        &lt;goal&gt;clean&lt;/goal&gt;
        &lt;goal&gt;package&lt;/goal&gt;
        &lt;goal&gt;android:deploy&lt;/goal&gt;
        &lt;goal&gt;android:run&lt;/goal&gt;
    &lt;/goals&gt;
    &lt;properties&gt;
        &lt;skipTests&gt;true&lt;/skipTests&gt;
        &lt;android.run.debug&gt;${jpda.attach.port}&lt;/android.run.debug&gt;
        &lt;jpda.attach&gt;true&lt;/jpda.attach&gt;
    &lt;/properties&gt;
&lt;/action&gt;
</pre>             
        <p>
        Value of <code>jpda.attach</code> property can either be <code>true</code>
        and in such case the IDE finds an empty port and sets values of 
        <code>jpda.attach.port</code> and <code>jpda.attach.address</code> 
        properties accordingly, or it can be directly specified
        <code>address:port</code> or just port number to connect to.
        </p>
        </api>
        <api category="stable" group="property" name="jpda.attach.trigger" type="export">
             <p>
             One can define following code in nbactions.xml file to start
             a process during goal execution and attach a debugger to it
             when the external process prints a text indicating it's ready for attaching debugger. 
                 One example is debugging applications using <a href="https://software.intel.com/en-us/multi-os-engine">Multi-OS Engine</a>:
             </p>
<pre>
    &lt;action&gt;
        &lt;actionName&gt;debug&lt;/actionName&gt;
        &lt;goals&gt;
            &lt;goal&gt;package&lt;/goal&gt;
            &lt;goal&gt;moe:launch&lt;/goal&gt;
        &lt;/goals&gt;
        &lt;properties&gt;
            &lt;skipTests&gt;true&lt;/skipTests&gt;
            &lt;moe.options&gt;debug:${jpda.attach.port}&lt;/moe.options&gt;
            &lt;jpda.attach&gt;true&lt;/jpda.attach&gt;
            &lt;jpda.attach.trigger&gt;JDWP will wait for debugger on port&lt;/jpda.attach.trigger&gt;
        &lt;/properties&gt;
        &lt;activatedProfiles&gt;
            &lt;activatedProfile&gt;moe&lt;/activatedProfile&gt;
        &lt;/activatedProfiles&gt;
    &lt;/action&gt;
</pre>             
        <p>
        Value of <code>jpda.attach.trigger</code> property is the expected text. 
        </p>
        </api>
     </p>
 </answer>

</api-answers>