Github user kl0u commented on a diff in the pull request:
https://github.com/apache/flink/pull/4331#discussion_r132895977
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/AfterMatchSkipStrategy.java
---
@@ -0,0 +1,112 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.apache.flink.cep.nfa;
+
+import java.io.Serializable;
+
+
+/**
+ * Indicate the skip strategy after a match process.
+ * <p>There're four kinds of strategies:
+ * SKIP_PAST_LAST_EVENT,
+ * SKIP_TO_NEXT_EVENT,
+ * SKIP_TO_FIRST_<code>PATTERN</code> and
+ * SKIP_TO_LAST_<code>PATTERN</code>.
+ * </p>
+ */
+public class AfterMatchSkipStrategy implements Serializable {
+
+ // default strategy
+ SkipStrategy strategy = SkipStrategy.SKIP_TO_NEXT_EVENT;
+
+ // pattern name to skip to
+ String patternName = null;
+
+ /**
+ * Skip to first *pattern*.
+ * @param patternName the pattern name to skip to
+ * @return
+ */
+ public static AfterMatchSkipStrategy skipToFirst(String patternName) {
+ return new AfterMatchSkipStrategy(SkipStrategy.SKIP_TO_FIRST,
patternName);
+ }
+
+ /**
+ * Skip to last *pattern*.
+ * @param patternName the pattern name to skip to
+ * @return
+ */
+ public static AfterMatchSkipStrategy skipToLast(String patternName) {
+ return new AfterMatchSkipStrategy(SkipStrategy.SKIP_TO_LAST,
patternName);
+ }
+
+ /**
+ * Skip past last event.
+ * @return
+ */
+ public static AfterMatchSkipStrategy skipPastLastEvent() {
+ return new
AfterMatchSkipStrategy(SkipStrategy.SKIP_PAST_LAST_EVENT);
+ }
+
+ /**
+ * Skip to next event.
+ * @return
+ */
+ public static AfterMatchSkipStrategy skipToNextEvent() {
+ return new
AfterMatchSkipStrategy(SkipStrategy.SKIP_TO_NEXT_EVENT);
+ }
+
+ private AfterMatchSkipStrategy(SkipStrategy strategy) {
+ this(strategy, null);
+ }
+
+ private AfterMatchSkipStrategy(SkipStrategy strategy, String
patternName) {
+ if (patternName == null && (strategy ==
SkipStrategy.SKIP_TO_FIRST || strategy == SkipStrategy.SKIP_TO_LAST)) {
+ throw new IllegalArgumentException("The patternName
field can not be empty when SkipStrategy is " + strategy);
+ }
+ this.strategy = strategy;
+ this.patternName = patternName;
+ }
+
+ public SkipStrategy getStrategy() {
+ return strategy;
+ }
+
+ public String getPatternName() {
+ return patternName;
+ }
+
+ @Override
+ public String toString() {
--- End diff --
If `patternName == null` then there is nothing to print, so it would be
nice to adjust the `toString()` accordingly.
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