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EnvOf.java
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EnvOf.java
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/*
* MIT License
*
* Copyright (c) 2019 Yurii Dubinka
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
* OR OTHER DEALINGS IN THE SOFTWARE.
*/
package io.github.dgroup.term4j.arg;
/**
* The system environment variable.
*
* Examples are <em>JAVA_HOME</em>, <em>PATH</em>.
* @see System#getenv()
*
* @since 0.1.0
*/
public final class EnvOf extends ArgEnvelope<String> {
/**
* Ctor.
* @param variable The system environment variable.
*/
public EnvOf(final String variable) {
super(
new ArgOf<>(
() -> variable,
() -> {
final String val = System.getenv(variable);
if (val == null) {
throw new ArgNotFoundException(
"The '%s' variable isn't set to the environment",
variable
);
}
return val;
},
() -> System.getenv(variable) != null
)
);
}
}