SlicingIterator.java

package pro.verron.officestamper.utils.iterator;

import org.jspecify.annotations.Nullable;

import java.util.NoSuchElementException;

/// A [ResetableIterator] implementation that provides a sliced view of another iterator. It allows iteration over a
/// subset of elements from a source iterator, defined by a start and end element.
///
/// @param <T> the type of elements returned by this iterator
public class SlicingIterator<T>
        implements ResetableIterator<T> {
    private final ResetableIterator<T> source;
    private final T start;
    private final T end;
    private @Nullable T next;
    private boolean foundStart = false;
    private boolean foundEnd = false;


    /// Constructs a new SlicingIterator with the specified source iterator and boundaries.
    ///
    /// @param source the underlying [ResetableIterator] to slice
    /// @param start the starting element (inclusive) for iteration
    /// @param end the ending element (inclusive) for iteration
    public SlicingIterator(ResetableIterator<T> source, T start, T end) {
        this.source = source;
        this.start = start;
        this.end = end;
        findNext();
    }

    private void findNext() {
        next = null;
        while (source.hasNext() && !foundStart) {
            var o = source.next();
            if (o == start) {
                foundStart = true;
                next = o;
            }
        }

        if (source.hasNext() && !foundEnd) {
            next = source.next();
            if (next == end) foundEnd = true;
        }
    }

    @Override
    public void reset() {
        source.reset();
        foundStart = false;
        foundEnd = false;
        findNext();
    }

    @Override
    public boolean hasNext() {
        return next != null;
    }

    @Override
    public T next() {
        if (next == null) throw new NoSuchElementException("No more elements to iterate");
        T result = next;
        findNext();
        return result;
    }
}













Active mutators

CONDITIONALS_BOUNDARY
EMPTY_RETURNS
FALSE_RETURNS
INCREMENTS
INVERT_NEGS
MATH
NEGATE_CONDITIONALS
NULL_RETURNS
PRIMITIVE_RETURNS
TRUE_RETURNS
VOID_METHOD_CALLS

Tests examined

Report generated by PIT 1.22.0

1		package pro.verron.officestamper.utils.iterator;
2
3		import org.jspecify.annotations.Nullable;
4
5		import java.util.NoSuchElementException;
6
7		/// A [ResetableIterator] implementation that provides a sliced view of another iterator. It allows iteration over a
8		/// subset of elements from a source iterator, defined by a start and end element.
9		///
10		/// @param <T> the type of elements returned by this iterator
11		public class SlicingIterator<T>
12		implements ResetableIterator<T> {
13		private final ResetableIterator<T> source;
14		private final T start;
15		private final T end;
16		private @Nullable T next;
17		private boolean foundStart = false;
18		private boolean foundEnd = false;
19
20
21		/// Constructs a new SlicingIterator with the specified source iterator and boundaries.
22		///
23		/// @param source the underlying [ResetableIterator] to slice
24		/// @param start the starting element (inclusive) for iteration
25		/// @param end the ending element (inclusive) for iteration
26		public SlicingIterator(ResetableIterator<T> source, T start, T end) {
27		this.source = source;
28		this.start = start;
29		this.end = end;
30	1 1. <init> : removed call to pro/verron/officestamper/utils/iterator/SlicingIterator::findNext → NO_COVERAGE	findNext();
31		}
32
33		private void findNext() {
34		next = null;
35	2 1. findNext : negated conditional → NO_COVERAGE 2. findNext : negated conditional → NO_COVERAGE	while (source.hasNext() && !foundStart) {
36		var o = source.next();
37	1 1. findNext : negated conditional → NO_COVERAGE	if (o == start) {
38		foundStart = true;
39		next = o;
40		}
41		}
42
43	2 1. findNext : negated conditional → NO_COVERAGE 2. findNext : negated conditional → NO_COVERAGE	if (source.hasNext() && !foundEnd) {
44		next = source.next();
45	1 1. findNext : negated conditional → NO_COVERAGE	if (next == end) foundEnd = true;
46		}
47		}
48
49		@Override
50		public void reset() {
51	1 1. reset : removed call to pro/verron/officestamper/utils/iterator/ResetableIterator::reset → NO_COVERAGE	source.reset();
52		foundStart = false;
53		foundEnd = false;
54	1 1. reset : removed call to pro/verron/officestamper/utils/iterator/SlicingIterator::findNext → NO_COVERAGE	findNext();
55		}
56
57		@Override
58		public boolean hasNext() {
59	2 1. hasNext : negated conditional → NO_COVERAGE 2. hasNext : replaced boolean return with true for pro/verron/officestamper/utils/iterator/SlicingIterator::hasNext → NO_COVERAGE	return next != null;
60		}
61
62		@Override
63		public T next() {
64	1 1. next : negated conditional → NO_COVERAGE	if (next == null) throw new NoSuchElementException("No more elements to iterate");
65		T result = next;
66	1 1. next : removed call to pro/verron/officestamper/utils/iterator/SlicingIterator::findNext → NO_COVERAGE	findNext();
67	1 1. next : replaced return value with null for pro/verron/officestamper/utils/iterator/SlicingIterator::next → NO_COVERAGE	return result;
68		}
69		}
		Mutations
30		1.1 Location : <init> Killed by : none removed call to pro/verron/officestamper/utils/iterator/SlicingIterator::findNext → NO_COVERAGE
35		1.1 Location : findNext Killed by : none negated conditional → NO_COVERAGE 2.2 Location : findNext Killed by : none negated conditional → NO_COVERAGE
37		1.1 Location : findNext Killed by : none negated conditional → NO_COVERAGE
43		1.1 Location : findNext Killed by : none negated conditional → NO_COVERAGE 2.2 Location : findNext Killed by : none negated conditional → NO_COVERAGE
45		1.1 Location : findNext Killed by : none negated conditional → NO_COVERAGE
51		1.1 Location : reset Killed by : none removed call to pro/verron/officestamper/utils/iterator/ResetableIterator::reset → NO_COVERAGE
54		1.1 Location : reset Killed by : none removed call to pro/verron/officestamper/utils/iterator/SlicingIterator::findNext → NO_COVERAGE
59		1.1 Location : hasNext Killed by : none negated conditional → NO_COVERAGE 2.2 Location : hasNext Killed by : none replaced boolean return with true for pro/verron/officestamper/utils/iterator/SlicingIterator::hasNext → NO_COVERAGE
64		1.1 Location : next Killed by : none negated conditional → NO_COVERAGE
66		1.1 Location : next Killed by : none removed call to pro/verron/officestamper/utils/iterator/SlicingIterator::findNext → NO_COVERAGE
67		1.1 Location : next Killed by : none replaced return value with null for pro/verron/officestamper/utils/iterator/SlicingIterator::next → NO_COVERAGE

SlicingIterator.java

Mutations

Active mutators

Tests examined