PaletteExtensionUtil.java

package org.activiti.designer.eclipse.util;

import java.util.List;

import org.activiti.designer.eclipse.common.ActivitiPlugin;
import org.activiti.designer.eclipse.extension.palette.IPaletteProvider;
import org.activiti.designer.integration.servicetask.CustomServiceTaskDescriptor;
import org.activiti.designer.util.extension.ExtensionUtil;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.SafeRunner;

public class PaletteExtensionUtil {
	
	public static void pushPaletteExtensions(){
		IExtensionRegistry registry = Platform.getExtensionRegistry();
		IConfigurationElement[] cfgs = registry.getConfigurationElementsFor(ActivitiPlugin.PALETTE_EXTENSION_PROVIDER_EXTENSIONPOINT_ID);
		for (IConfigurationElement cfg : cfgs){
			try {
				Object o = cfg.createExecutableExtension("class");
				if (o instanceof IPaletteProvider){
					executeExtension((IPaletteProvider)o);
				}
			} catch (CoreException e) {
				e.printStackTrace();
			}
		}
	}

	private static void executeExtension(final IPaletteProvider provider) {
		ISafeRunnable runnable = new ISafeRunnable() {
			@Override
			public void handleException(Throwable e) {
				System.out.println("Exception in client");
				e.printStackTrace();
			}

			@Override
			public void run() throws Exception {
				List<CustomServiceTaskDescriptor> descriptors = provider.provide();
				ExtensionUtil.addProvidedCustomServiceTaskDescriptors(descriptors);
			}
		};
		SafeRunner.run(runnable);
	}
}