spring StringToBooleanConverter 源码
spring StringToBooleanConverter 代码
文件路径：/spring-core/src/main/java/org/springframework/core/convert/support/StringToBooleanConverter.java
/*
* Copyright 2002-2022 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.core.convert.support;
import java.util.Set;
import org.springframework.core.convert.converter.Converter;
import org.springframework.lang.Nullable;
/**
* Converts a String to a Boolean.
*
* @author Keith Donald
* @author Juergen Hoeller
* @author Sam Brannen
* @since 3.0
*/
final class StringToBooleanConverter implements Converter<String, Boolean> {
private static final Set<String> trueValues = Set.of("true", "on", "yes", "1");
private static final Set<String> falseValues = Set.of("false", "off", "no", "0");
@Override
@Nullable
public Boolean convert(String source) {
String value = source.trim();
if (value.isEmpty()) {
return null;
}
value = value.toLowerCase();
if (trueValues.contains(value)) {
return Boolean.TRUE;
}
else if (falseValues.contains(value)) {
return Boolean.FALSE;
}
else {
throw new IllegalArgumentException("Invalid boolean value '" + source + "'");
}
}
}
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