/*
* Copyright 2011 Henry Coles
*
* 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.pitest.mutationtest.filter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import org.pitest.mutationtest.engine.MutationDetails;
public class LimitNumberOfMutationPerClassFilter implements MutationFilter {
private final int maxMutationsPerClass;
public LimitNumberOfMutationPerClassFilter(final int max) {
this.maxMutationsPerClass = max;
}
@Override
public Collection<MutationDetails> filter(
final Collection<MutationDetails> mutations) {
if (mutations.size() <= this.maxMutationsPerClass) {
return mutations;
} else {
return createEvenlyDistributedSampling(mutations);
}
}
private Collection<MutationDetails> createEvenlyDistributedSampling(
final Collection<MutationDetails> mutations) {
final Collection<MutationDetails> filtered = new ArrayList<MutationDetails>(
this.maxMutationsPerClass);
final int step = (mutations.size() / this.maxMutationsPerClass);
final Iterator<MutationDetails> it = mutations.iterator();
while (it.hasNext()) {
int i = 0;
MutationDetails value = null;
while (it.hasNext() && (i != step)) {
value = it.next();
i++;
}
if (filtered.size() != this.maxMutationsPerClass) {
filtered.add(value);
}
}
return filtered;
}
}