/*
* 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.pattern.conditions;
import org.apache.flink.api.common.functions.FilterFunction;
/**
* A user-defined condition that decides if an element should be accepted in the pattern or not.
* Accepting an element also signals a state transition for the corresponding {@link org.apache.flink.cep.nfa.NFA}.
*
* <p>Contrary to the {@link IterativeCondition}, conditions that extend this class do not have access to the
* previously accepted elements in the pattern. Conditions that extend this class are simple {@code filter(...)}
* functions that decide based on the properties of the element at hand.
*/
public abstract class SimpleCondition<T> extends IterativeCondition<T> implements FilterFunction<T> {
private static final long serialVersionUID = 4942618239408140245L;
@Override
public boolean filter(T value, Context<T> ctx) throws Exception {
return filter(value);
}
}