/*
* Copyright 2012 Agorava
*
* 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 org.agorava.utils.solder.util.collections;
import java.util.HashSet;
import java.util.Set;
public class Sets {
private Sets() {
}
/**
* Calculates and returns the hash code of {@code s}.
*/
static int hashCodeImpl(Set<?> s) {
int hashCode = 0;
for (Object o : s) {
hashCode += o != null ? o.hashCode() : 0;
}
return hashCode;
}
/**
* Creates an empty {@code HashSet} instance with enough capacity to hold the
* specified number of elements without rehashing.
*
* @param expectedSize the expected size
* @return a new, empty {@code HashSet} with enough capacity to hold {@code
* expectedSize} elements without rehashing
* @throws IllegalArgumentException if {@code expectedSize} is negative
*/
public static <E> HashSet<E> newHashSetWithExpectedSize(int expectedSize) {
return new HashSet<E>(Maps.capacity(expectedSize));
}
}