io.trino.operator.window.matcher.IntStack 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 io.airlift.slice.SizeOf;
import java.util.Arrays;
import static io.airlift.slice.SizeOf.instanceSize;
class IntStack
{
private static final int INSTANCE_SIZE = instanceSize(IntStack.class);
private int[] values;
private int next;
public IntStack(int capacity)
{
values = new int[capacity];
}
public void push(int value)
{
ensureCapacity();
values[next] = value;
next++;
}
public int pop()
{
next--;
return values[next];
}
public int size()
{
return next;
}
private void ensureCapacity()
{
if (next == values.length) {
values = Arrays.copyOf(values, next * 2 + 1);
}
}
public long getSizeInBytes()
{
return INSTANCE_SIZE + SizeOf.sizeOf(values);
}
}