io.trino.operator.window.matcher.ArrayView Maven / Gradle / Ivy
/*
* Licensed 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 io.trino.operator.window.matcher;
import com.google.common.annotations.VisibleForTesting;
import java.util.Arrays;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
public class ArrayView
{
public static final ArrayView EMPTY = new ArrayView(new int[] {}, 0);
private final int[] array;
private final int length;
public ArrayView(int[] array, int length)
{
this.array = requireNonNull(array, "array is null");
checkArgument(length >= 0, "used slots count is negative");
checkArgument(length <= array.length, "used slots count exceeds array size");
this.length = length;
}
public int get(int index)
{
checkArgument(index >= 0 && index < length, "array index out of bounds");
return array[index];
}
public int length()
{
return length;
}
@VisibleForTesting
int[] toArray()
{
return Arrays.copyOf(array, length);
}
}