/*******************************************************************************
* Copyright (c) 2012 Obeo.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.emf.eef.runtime.impl.services;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.eef.runtime.EEFRuntimePlugin;
import org.eclipse.emf.eef.runtime.policies.ILockPolicy;
/**
* Service that manage all the registered {@link ILockPolicy}.
*
* @author <a href="mailto:nathalie.lepine@obeo.fr">Nathalie Lepine</a>
*/
public class LockPolicyProviderService {
/**
* The extension name.
*/
public static final String EXTENSION_NAME = "LockPolicyProvider"; //$NON-NLS-1$
/**
* The extension's element name.
*/
private static final String EXTENSION_ELEMENT_NAME = "LockPolicyProvider"; //$NON-NLS-1$
/**
* The element's attribute name.
*/
private static final String EXTENSION_ATTRIBUTE_NAME = "policyClass"; //$NON-NLS-1$
/**
* A singleton for the service.
*/
private static LockPolicyProviderService instance = new LockPolicyProviderService();
/**
* The factory where the providers are registered.
*/
private List<ILockPolicy> lockPolicies;
/**
* Default constructor.
*/
private LockPolicyProviderService() {
lockPolicies = new ArrayList<ILockPolicy>();
configureService();
}
/**
* Singleton constructor.
*
* @return the Singleton instance
*/
public static LockPolicyProviderService getInstance() {
return instance;
}
/**
* @return all the registered policies
*/
public List<ILockPolicy> getPolicies() {
return lockPolicies;
}
/**
* Register a policy.
*
* @param lockPolicy LockPolicy
*/
public void register(ILockPolicy lockPolicy) {
lockPolicies.add(lockPolicy);
}
/**
* Load all the providers registered by extension point.
*/
private void configureService() {
IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(
EEFRuntimePlugin.PLUGIN_ID, EXTENSION_NAME);
IExtension[] extensions = extensionPoint.getExtensions();
for (int extensionIndex = 0; extensionIndex < extensions.length; extensionIndex++) {
IExtension extension = extensions[extensionIndex];
IConfigurationElement[] configurationElements = extension.getConfigurationElements();
for (int i = 0; i < configurationElements.length; i++) {
IConfigurationElement cfg = configurationElements[i];
if (EXTENSION_ELEMENT_NAME.equals(cfg.getName())) {
try {
register((ILockPolicy)cfg
.createExecutableExtension(EXTENSION_ATTRIBUTE_NAME));
} catch (CoreException e) {
e.printStackTrace();
}
}
}
}
}
}