PerspectiveSwitchHandler.java

package com.example.e4.rcp.todo.handlers;

import java.util.List;

import javax.inject.Named;

import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.model.application.MApplication;
import org.eclipse.e4.ui.model.application.ui.advanced.MPerspective;
import org.eclipse.e4.ui.model.application.ui.basic.MWindow;
import org.eclipse.e4.ui.workbench.modeling.EModelService;
import org.eclipse.e4.ui.workbench.modeling.EPartService;

// switcher perspectives based on a command parameter 
public class PerspectiveSwitchHandler {
	
	@Execute
	public void switchPerspective(
			MWindow window, 
			EPartService partService,
			EModelService modelService,
			@Named("perspective_parameter") String perspectiveId) {
		// use parameter to find perspectives
		List<MPerspective> perspectives = modelService.findElements(window,
				perspectiveId, MPerspective.class, null);

		// switch to perspective with the ID if found
		if (!perspectives.isEmpty()) {
			partService.switchPerspective(perspectives.get(0));
		}
	}
}