Creating new Java elements via the Java model

The following will create a command which will create a new package to existing (and open) Java projects which have the same name as the Java project. For example if you have a project "de.vogella.test" in your workspace without any package this command will create the package "de.vogella.test" in this project.

Create a new plugin project "de.vogella.jdt.newelements".

Add a new command "de.vogella.jdt.newelements.AddPackage" and put it into the menu.

Create the following handler for this command.

   
package de.vogella.jdt.newelements.handler;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;

public class AddPackage extends AbstractHandler implements IHandler {

 @Override
 public Object execute(ExecutionEvent event) throws ExecutionException {
  IWorkspace workspace = ResourcesPlugin.getWorkspace();
  IWorkspaceRoot root = workspace.getRoot();
  // Get all projects in the workspace
  IProject[] projects = root.getProjects();
  // Loop over all projects
  for (IProject project : projects) {
   try {
    // Only work on open projects with the Java nature
    if (project.isOpen()
      && project
        .isNatureEnabled("org.eclipse.jdt.core.javanature")) {
     IJavaProject javaProject = JavaCore.create(project);
     IFolder folder = project.getFolder("src");
     // folder.create(true, true, null);
     IPackageFragmentRoot srcFolder = javaProject
       .getPackageFragmentRoot(folder);
     IPackageFragment fragment = srcFolder
       .createPackageFragment(project.getName(), true,
         null);
     System.out.println("Juhu");
    }
   } catch (CoreException e) {
    e.printStackTrace();
   }
  }
  return null;
 }
}

  

Tip