/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.util.concurrent;
import java.lang.reflect.Array;
/**
* Arrays.copyOf and Arrays.copyOfRange backported from Java 6.
*/
class Java6Arrays {
static <T> T[] copyOf(T[] original, int newLength) {
if (null == original) {
throw new NullPointerException();
}
if (0 <= newLength) {
return copyOfRange(original, 0, newLength);
}
throw new NegativeArraySizeException();
}
static <T, U> T[] copyOf(U[] original, int newLength,
Class<? extends T[]> newType) {
if (0 <= newLength) {
return copyOfRange(original, 0, newLength, newType);
}
throw new NegativeArraySizeException();
}
@SuppressWarnings("unchecked")
static <T> T[] copyOfRange(T[] original, int start, int end) {
if (original.length >= start && 0 <= start) {
if (start <= end) {
int length = end - start;
int copyLength = Math.min(length, original.length - start);
T[] copy = (T[]) Array.newInstance(original.getClass().getComponentType(), length);
System.arraycopy(original, start, copy, 0, copyLength);
return copy;
}
throw new IllegalArgumentException();
}
throw new ArrayIndexOutOfBoundsException();
}
@SuppressWarnings("unchecked")
static <T, U> T[] copyOfRange(U[] original, int start, int end,
Class<? extends T[]> newType) {
if (start <= end) {
if (original.length >= start && 0 <= start) {
int length = end - start;
int copyLength = Math.min(length, original.length - start);
T[] copy = (T[]) Array.newInstance(newType.getComponentType(),
length);
System.arraycopy(original, start, copy, 0, copyLength);
return copy;
}
throw new ArrayIndexOutOfBoundsException();
}
throw new IllegalArgumentException();
}
}