[MDEP-674] Add IDE build support (#257)

Use BuildContext to notify about newly generated files/folders

Author: kwin

pom.xml

@@ -247,6 +247,15 @@ under the License.
       <version>${resolverVersion}</version>
       <scope>provided</scope>
     </dependency>
+    <!-- IDE build support (https://github.com/codehaus-plexus/plexus-build-api) -->
+    <dependency>
+      <groupId>org.sonatype.plexus</groupId>
+      <artifactId>plexus-build-api</artifactId>
+      <version>0.0.7</version><!-- stick with old GAV until https://github.com/eclipse-m2e/m2e-core/issues/944 is fixed -->
+      <scope>compile</scope>
+    </dependency>
+    
+    <!-- test -->
     <dependency>
       <groupId>org.eclipse.aether</groupId>
       <artifactId>aether-connector-basic</artifactId>
@@ -265,8 +274,6 @@ under the License.
       <version>${resolverVersion}</version>
       <scope>test</scope>
     </dependency>
-
-    <!-- test -->
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>

src/main/java/org/apache/maven/plugins/dependency/AbstractDependencyMojo.java

@@ -46,6 +46,7 @@
 import org.codehaus.plexus.util.FileUtils;
 import org.codehaus.plexus.util.ReflectionUtils;
 import org.codehaus.plexus.util.StringUtils;
+import org.sonatype.plexus.build.incremental.BuildContext;
 
 /**
  * @author <a href="mailto:[email protected]">Brian Fox</a>
@@ -59,6 +60,22 @@ public abstract class AbstractDependencyMojo
     @Component
     private ArchiverManager archiverManager;
 
+
+    /**
+     * For IDE build support
+     */
+    @Component
+    private BuildContext buildContext;
+
+    /**
+     * Skip plugin execution only during incremental builds (e.g. triggered from M2E).
+     * 
+     * @since 3.4.0
+     * @see #skip
+     */
+    @Parameter( defaultValue = "false" )
+    private boolean skipDuringIncrementalBuild;
+
     /**
      * <p>
      * will use the jvm chmod, this is available for user and all level group level will be ignored
@@ -189,6 +206,7 @@ protected void copyFile( File artifact, File destFile )
             }
 
             FileUtils.copyFile( artifact, destFile );
+            buildContext.refresh( destFile );
         }
         catch ( IOException e )
         {
@@ -326,6 +344,7 @@ protected void unpack( Artifact artifact, String type, File location, String inc
         {
             throw new MojoExecutionException( "Error unpacking file: " + file + " to: " + location, e );
         }
+        buildContext.refresh( location );
     }
 
     private void silenceUnarchiver( UnArchiver unArchiver )
@@ -410,6 +429,10 @@ public void setUseJvmChmod( boolean useJvmChmod )
      */
     public boolean isSkip()
     {
+        if ( skipDuringIncrementalBuild && buildContext.isIncremental() )
+        {
+            return true;
+        }
         return skip;
     }