ScalaSourcesNodeFactory.java

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package org.netbeans.modules.scala.maven;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.netbeans.api.java.project.JavaProjectConstants;
import org.netbeans.api.project.Project;
import org.netbeans.api.project.ProjectUtils;
import org.netbeans.api.project.SourceGroup;
import org.netbeans.api.project.Sources;
import org.netbeans.modules.maven.spi.nodes.AbstractMavenNodeList;
import org.netbeans.spi.java.project.support.ui.PackageView;
import org.netbeans.spi.project.ui.support.NodeFactory;
import org.netbeans.spi.project.ui.support.NodeList;
import org.openide.filesystems.FileObject;
import org.openide.nodes.Node;
import org.openide.util.RequestProcessor;

/**
 *
 * @author mkleint
 */
@NodeFactory.Registration(projectType="org-netbeans-modules-maven",position=139)
public class ScalaSourcesNodeFactory implements NodeFactory {

    private static final RequestProcessor RP = new RequestProcessor(ScalaSourcesNodeFactory.class);
    
    @Override
    public NodeList<?> createNodes(Project project) {
        return  new NList(project);
    }
    
    private static class NList extends AbstractMavenNodeList<SourceGroup> implements ChangeListener {
        private Project project;
        private NList(Project prj) {
            project = prj;
        }
        
        @Override
        public List<SourceGroup> keys() {
            //#169192 check roots against java roots and if the same don't show twice.
            Set<FileObject> javaroots = new HashSet<FileObject>();
            SourceGroup[] javasg = ProjectUtils.getSources(project).getSourceGroups(JavaProjectConstants.SOURCES_TYPE_JAVA);
            for (SourceGroup sg : javasg) {
                javaroots.add(sg.getRootFolder());
            }

            List<SourceGroup> list = new ArrayList<SourceGroup>();
            Sources srcs = ProjectUtils.getSources(project);
            SourceGroup[] groovygroup = srcs.getSourceGroups(ScalaSourcesImpl.TYPE_SCALA);
            for (int i = 0; i < groovygroup.length; i++) {
                if (!javaroots.contains(groovygroup[i].getRootFolder())) {
                    list.add(groovygroup[i]);
                }
            }
            return list;
        }
        
        @Override
        public Node node(SourceGroup group) {
            return PackageView.createPackageView(group);
        }
        
        @Override
        public void addNotify() {
            Sources srcs = ProjectUtils.getSources(project);
            srcs.addChangeListener(this);
        }
        
        @Override
        public void removeNotify() {
            Sources srcs = ProjectUtils.getSources(project);
            srcs.removeChangeListener(this);
        }

        @Override
        public void stateChanged(ChangeEvent arg0) {
            //#167372 break the stack trace chain to prevent deadlocks.
            RP.post(new Runnable() {
                @Override
                public void run() {
                    fireChange();
                }
            });
        }
    }
}