jcommons/org.eclipse.statet.jcommons.util/src/org/eclipse/statet/internal/jcommons/collections/ArrayUtils.java

/*=============================================================================#
 # Copyright (c) 2020, 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.internal.jcommons.collections;

import static org.eclipse.statet.jcommons.lang.NullDefaultLocation.FIELD;
import static org.eclipse.statet.jcommons.lang.NullDefaultLocation.PARAMETER;
import static org.eclipse.statet.jcommons.lang.NullDefaultLocation.RETURN_TYPE;

import java.util.List;

import org.eclipse.statet.jcommons.lang.NonNullByDefault;


@NonNullByDefault({ PARAMETER, RETURN_TYPE, FIELD })
public final class ArrayUtils {
	
	
	public static <E> E[] copyRemoveElement(final List<? extends E> l, final int n, final int index) {
		@SuppressWarnings("unchecked")
		final E[] a= (E[])new Object[n];
		if (l instanceof AbstractImList<?>) {
			if (index > 0) {
				((AbstractImList<?>)l).copyTo(0, a, 0, index);
			}
			if (index < n) {
				((AbstractImList<?>)l).copyTo(index + 1, a, index, n - index);
			}
		}
		else {
			final Object[] src= l.toArray();
			if (index > 0) {
				System.arraycopy(src, 0, a, 0, index);
			}
			if (index < n) {
				System.arraycopy(src, index + 1, a, index, n - index);
			}
		}
		return a;
	}
	
	
	private ArrayUtils() {
	}
	
}