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/*
 * Copyright 2015-2018 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 v2.0 which
 * accompanies this distribution and is available at
 *
 * http://www.eclipse.org/legal/epl-v20.html
 */

package org.junit.jupiter.api.condition;

import static org.apiguardian.api.API.Status.EXPERIMENTAL;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.apiguardian.api.API;

/**
 * {@code @DisabledIf} is used to control whether the annotated test class or
 * test method is enabled or disabled by evaluating a script.
 *
 * 
The decision is made by interpreting the return value of the supplied
 * {@linkplain #value script}, according to the following table.
 *
 * 
 * 
 *   
 *   
 * 
 * 
 *   
 *   
 * 
 * 
 *   
 *   
 * 
 * 
 *   
 *   
 * 
 * 
 *   
 *   
 * 
 * 
 *   
 *   
 * 
 * 
Return Type
Evaluation Result
{@code boolean}
The annotated element will be disabled if the value is {@code true}.
{@code java.lang.Boolean}
The annotated element will be disabled if the value is {@code Boolean.TRUE}.
{@code ConditionEvaluationResult}
An instance of {@link org.junit.jupiter.api.extension.ConditionEvaluationResult
 *       ConditionEvaluationResult} will be handled directly by JUnit Jupiter as if the
 *       script were an implementation of {@link org.junit.jupiter.api.extension.ExecutionCondition
 *       ExecutionCondition}.
*
The value of any other return type will be converted to its String
 *       representation by {@link String#valueOf(Object)} and then interpreted as
 *       a boolean by passing the String representation to
 *       {@link Boolean#parseBoolean(String)}.
{@code null}
A return value of {@code null} is considered to be an error and will
 *       raise a {@link org.junit.jupiter.api.extension.ScriptEvaluationException ScriptEvaluationException}.
 *
 * 
If a test class is disabled via the evaluation of {@code @DisabledIf}, all
 * test methods within that class are automatically disabled as well.
 *
 * 
Script Engines
 *
 * 
The default script engine is Oracle Nashorn; however, the
 * {@link #engine} attribute may be used to override the default script engine
 * name.
 *
 * 
Bindings
 *
 * 
An accessor provides access to a map-like structure via a simple
 * {@code String get(String name)} method. The following property accessors are
 * automatically available within scripts.
 *
 * 

 * 
{@code systemEnvironment}: Operating system environment variable accessor
 * 
{@code systemProperty}: JVM system property accessor
 * 
 *
 * 
The following {@link javax.script.Bindings bindings} are available for accessing information
 * from the JUnit Jupiter {@link org.junit.jupiter.api.extension.ExtensionContext
 * ExtensionContext}.
 *
 * 

 * 
{@code junitTags}: All tags as a {@code Set}
 * 
{@code junitDisplayName}: Display name as a {@code String}
 * 
{@code junitUniqueId}: Unique ID as a {@code String}
 * 
{@code junitConfigurationParameter}: Configuration parameter accessor
 * 
 *
 * 
Scripts must not declare variables using names that start with {@code junit}.
 * They might clash with new bindings introduced in the future.
 *
 * @since 5.1
 * @see org.junit.jupiter.api.Disabled
 * @see org.junit.jupiter.api.condition.EnabledIf
 * @see org.junit.jupiter.api.condition.EnabledIfEnvironmentVariable
 * @see org.junit.jupiter.api.condition.EnabledIfSystemProperty
 * @see org.junit.jupiter.api.condition.EnabledOnJre
 * @see org.junit.jupiter.api.condition.EnabledOnOs
 * @see org.junit.jupiter.api.condition.DisabledIf
 * @see org.junit.jupiter.api.condition.DisabledIfEnvironmentVariable
 * @see org.junit.jupiter.api.condition.DisabledIfSystemProperty
 * @see org.junit.jupiter.api.condition.DisabledOnJre
 * @see org.junit.jupiter.api.condition.DisabledOnOs
 * @see org.junit.jupiter.api.extension.ExecutionCondition
 * @see javax.script.ScriptEngine
 */
@Target({ ElementType.TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
@API(status = EXPERIMENTAL, since = "5.1")
public @interface DisabledIf {

	/**
	 * The lines of the script to evaluate.
	 */
	String[] value();

	/**
	 * The reason this annotated test class or test method is enabled
	 * or disabled.
	 *
	 * 
Defaults to: "Script `{script}` evaluated to: {result}".
	 *
	 * 
Supported placeholders
	 * 

	 *   
{annotation}: the String representation of the {@code @DisabledIf} annotation instance
	 *   
{script}: the script text that was evaluated
	 *   
{result}: the String representation of the return value of the evaluated script
	 * 
	 *
	 * @return the reason the element is enabled or disabled
	 * @see org.junit.jupiter.api.extension.ConditionEvaluationResult#getReason()
	 */
	String reason() default "Script `{source}` evaluated to: {result}";

	/**
	 * Short name of the {@link javax.script.ScriptEngine ScriptEngine} to use.
	 *
	 * 
Oracle Nashorn is used by default, providing support for evaluating
	 * JavaScript scripts.
	 *
	 * 
Until Java SE 7, JDKs shipped with a JavaScript scripting engine based
	 * on Mozilla Rhino. Java SE 8 instead ships with the new engine called
	 * Oracle Nashorn, which is based on JSR 292 and {@code invokedynamic}.
	 *
	 * @return script engine name
	 * @see javax.script.ScriptEngineManager#getEngineByName(String)
	 * @see Oracle Nashorn
	 */
	String engine() default "Nashorn";

}