ecommons/org.eclipse.statet.ecommons.uimisc/src/org/eclipse/statet/ecommons/ui/actions/HandlerCollection.java

/*=============================================================================#
 # Copyright (c) 2009, 2021 Stephan Wahlbrink and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 # which is available at https://www.apache.org/licenses/LICENSE-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 # 
 # Contributors:
 #     Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.ecommons.ui.actions;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.commands.IHandler2;


/**
 * Utility to manage the command handler of a service layer (view, dialog, etc.).
 */
public class HandlerCollection {
	
	
	private final Map<String, IHandler2> handlers= new HashMap<>();
	
	
	public HandlerCollection() {
	}
	
	
	public void add(final String commandId, final IHandler2 handler) {
		if (commandId == null || handler == null) {
			throw new NullPointerException();
		}
		this.handlers.put(commandId, handler);
	}
	
	public IHandler2 get(final String commandId) {
		return this.handlers.get(commandId);
	}
	
	public void update(final Object evaluationContext) {
		for (final IHandler2 handler : this.handlers.values()) {
			handler.setEnabled(evaluationContext);
		}
	}
	
	
	public void dispose() {
		for (final IHandler2 handler : this.handlers.values()) {
			handler.dispose();
		}
		this.handlers.clear();
	}
	
}