flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/aftermatch/SkipToLastStrategy.java

/*
 * 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.aftermatch;

/**
 * Discards every partial match that started before the last event of emitted match mapped to *PatternName*.
 */
public final class SkipToLastStrategy extends SkipToElementStrategy {
	private static final long serialVersionUID = 7585116990619594531L;

	public SkipToLastStrategy(String patternName, boolean shouldThrowException) {
		super(patternName, shouldThrowException);
	}

	@Override
	public SkipToElementStrategy throwExceptionOnMiss() {
		return new SkipToLastStrategy(getPatternName().get(), true);
	}

	@Override
	int getIndex(int size) {
		return size - 1;
	}

	@Override
	public String toString() {
		return "SkipToLastStrategy{" +
			"patternName='" + getPatternName().get() + '\'' +
			'}';
	}
}