spring-retry PatternMatchingClassifier 源码
spring-retry PatternMatchingClassifier 代码
文件路径：/src/main/java/org/springframework/classify/PatternMatchingClassifier.java
/*
* Copyright 2006-2022 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.classify;
import java.util.HashMap;
import java.util.Map;
/**
* A {@link Classifier} that maps from String patterns with wildcards to a set of values
* of a given type. An input String is matched with the most specific pattern possible to
* the corresponding value in an input map. A default value should be specified with a
* pattern key of "*".
*
* @author Dave Syer
* @param <T> the output of the classifier
*/
@SuppressWarnings("serial")
public class PatternMatchingClassifier<T> implements Classifier<String, T> {
private PatternMatcher<T> values;
/**
* Default constructor. Use the setter or the other constructor to create a sensible
* classifier, otherwise all inputs will cause an exception.
*/
public PatternMatchingClassifier() {
this(new HashMap<>());
}
/**
* Create a classifier from the provided map. The keys are patterns, using '?' as a
* single character and '*' as multi-character wildcard.
* @param values the values to use in the {@link PatternMatcher}
*/
public PatternMatchingClassifier(Map<String, T> values) {
super();
this.values = new PatternMatcher<>(values);
}
/**
* A map from pattern to value
* @param values the pattern map to set
*/
public void setPatternMap(Map<String, T> values) {
this.values = new PatternMatcher<>(values);
}
/**
* Classify the input by matching it against the patterns provided in
* {@link #setPatternMap(Map)}. The most specific pattern that matches will be used to
* locate a value.
* @return the value matching the most specific pattern possible
* @throws IllegalStateException if no matching value is found.
*/
@Override
public T classify(String classifiable) {
T value = this.values.match(classifiable);
return value;
}
}
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