/*
* 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 com.facebook.presto.raptor.util;
import com.google.common.collect.ImmutableList;
import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.List;
public final class ArrayUtil
{
private ArrayUtil() {}
/**
* Unpack an array of big endian ints.
*/
public static List<Integer> intArrayFromBytes(byte[] bytes)
{
ImmutableList.Builder<Integer> list = ImmutableList.builder();
ByteBuffer buffer = ByteBuffer.wrap(bytes);
while (buffer.hasRemaining()) {
list.add(buffer.getInt());
}
return list.build();
}
/**
* Pack an array of ints as big endian.
*/
public static byte[] intArrayToBytes(Collection<Integer> values)
{
ByteBuffer buffer = ByteBuffer.allocate(values.size() * Integer.BYTES);
for (int value : values) {
buffer.putInt(value);
}
return buffer.array();
}
}