org.springframework.core.convert.support.StringToBooleanConverter Maven / Gradle / Ivy
/*
* Copyright 2002-2016 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.HashSet;
import java.util.Set;
import org.springframework.core.convert.converter.Converter;
/**
* Converts String to a Boolean.
*
* @author Keith Donald
* @author Juergen Hoeller
* @since 3.0
*/
final class StringToBooleanConverter implements Converter {
private static final Set trueValues = new HashSet<>(4);
private static final Set falseValues = new HashSet<>(4);
static {
trueValues.add("true");
trueValues.add("on");
trueValues.add("yes");
trueValues.add("1");
falseValues.add("false");
falseValues.add("off");
falseValues.add("no");
falseValues.add("0");
}
@Override
public Boolean convert(String source) {
String value = source.trim();
if ("".equals(value)) {
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 + "'");
}
}
}