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// Copyright 2014 Google Inc. All rights reserved.
//
// 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.google.devtools.build.xcode.util;
import com.google.common.collect.Sets;
import java.util.Set;
/**
* Provides utility methods that make difference operations type safe.
*
* {@link Sets#difference(Set, Set)} requires no type bound on the second set, which has led to
* calls which can never subtract any elements because the set being subtracted cannot contain any
* elements which may exist in the first set.
*/
public class Difference {
private Difference() {
throw new UnsupportedOperationException("static-only");
}
/**
* Returns the elements in set1 which are not in set2. set2 may contain extra elements which will
* be ignored.
*
* @param set1 Set whose elements to return
* @param set2 Set whose elements are to be subtracted
*/
public static <T> Set<T> of(Set<T> set1, Set<T> set2) {
return Sets.difference(set1, set2);
}
}
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