io.vertx.core.cli.converters.BooleanConverter Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2015 The original author or authors
* ------------------------------------------------------
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* The Apache License v2.0 is available at
* http://www.opensource.org/licenses/apache2.0.php
*
* You may elect to redistribute this code under either of these licenses.
*/
package io.vertx.core.cli.converters;
import java.util.Arrays;
import java.util.List;
/**
* A converter for boolean. This converter considered as 'true' : "true", "on", "1",
* "yes". All other values are considered as 'false' (as a consequence, 'null' is considered as 'false').
*
* @author Clement Escoffier
*/
public final class BooleanConverter implements Converter {
/**
* The converter.
*/
public static final BooleanConverter INSTANCE = new BooleanConverter();
/**
* The set of values considered as 'true'.
*/
private static final List TRUE = Arrays.asList("true", "yes", "on", "1");
private BooleanConverter() {
// No direct instantiation
}
/**
* Creates the boolean value from the given String. If the given String does not match one of the 'true' value,
* {@code false} is returned.
*
* @param value the value
* @return the boolean object
*/
@Override
public Boolean fromString(String value) {
return value != null && TRUE.contains(value.toLowerCase());
}
}