diff options
Diffstat (limited to 'subprojects/logic/src/main/java/tools/refinery/logic/term/StatefulAggregator.java')
-rw-r--r-- | subprojects/logic/src/main/java/tools/refinery/logic/term/StatefulAggregator.java | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/subprojects/logic/src/main/java/tools/refinery/logic/term/StatefulAggregator.java b/subprojects/logic/src/main/java/tools/refinery/logic/term/StatefulAggregator.java new file mode 100644 index 00000000..79d32535 --- /dev/null +++ b/subprojects/logic/src/main/java/tools/refinery/logic/term/StatefulAggregator.java | |||
@@ -0,0 +1,28 @@ | |||
1 | /* | ||
2 | * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/> | ||
3 | * | ||
4 | * SPDX-License-Identifier: EPL-2.0 | ||
5 | */ | ||
6 | package tools.refinery.logic.term; | ||
7 | |||
8 | import java.util.stream.Stream; | ||
9 | |||
10 | public interface StatefulAggregator<R, T> extends Aggregator<R, T> { | ||
11 | StatefulAggregate<R, T> createEmptyAggregate(); | ||
12 | |||
13 | @Override | ||
14 | default R aggregateStream(Stream<T> stream) { | ||
15 | var accumulator = createEmptyAggregate(); | ||
16 | var iterator = stream.iterator(); | ||
17 | while (iterator.hasNext()) { | ||
18 | var value = iterator.next(); | ||
19 | accumulator.add(value); | ||
20 | } | ||
21 | return accumulator.getResult(); | ||
22 | } | ||
23 | |||
24 | @Override | ||
25 | default R getEmptyResult() { | ||
26 | return createEmptyAggregate().getResult(); | ||
27 | } | ||
28 | } | ||