jcommons/org.eclipse.statet.jcommons.util/src/org/eclipse/statet/jcommons/ts/core/util/ToolCommandHandlerUtils.java

/*=============================================================================#
 # Copyright (c) 2008, 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.jcommons.ts.core.util;

import java.util.Map;


/**
 * Utilities for implementations of {@link org.eclipse.statet.jcommons.ts.core.ToolCommandHandler}.
 */
public class ToolCommandHandlerUtils {
	
	
	@SuppressWarnings("unchecked")
	public static <C> C getCheckedData(final Map<String, Object> data, final String name,
			final Class<C> clazz, final boolean required) {
		final Object obj= data.get(name);
		if (obj == null) {
			if (required) {
				throw new IllegalArgumentException("missing data entry: '" + name + '"');
			}
			return null;
		}
		if (!clazz.isInstance(obj)) {
			throw new IllegalArgumentException("incompatible data entry: '" + name + "' (" + obj.getClass().getName() + ")");
		}
		return (C) obj;
	}
	
	@SuppressWarnings("unchecked")
	public static <C> C getCheckedData(final Map<String, Object> data, final String name, final C defValue) {
		final Object obj= data.get(name);
		if (obj == null) {
			return defValue;
		}
		if (!defValue.getClass().isInstance(obj)) {
			throw new IllegalArgumentException("incompatible data entry: '" + name + "' (" + obj.getClass().getName() + ")");
		}
		return (C) obj;
	}
	
	
	private ToolCommandHandlerUtils() {}
	
}