org.wildfly.extras.config.internal.IllegalStateAssertion Maven / Gradle / Ivy
/*
* #%L
* Fabric8 :: SPI
* %%
* Copyright (C) 2014 Red Hat
* %%
* 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
*
* http://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.
* #L%
*/
package org.wildfly.extras.config.internal;
/**
* Legal state assertions
*
* @author [email protected]
* @since 18-Apr-2014
*/
public final class IllegalStateAssertion {
// hide ctor
private IllegalStateAssertion() {
}
/**
* Throws an IllegalStateException when the given value is not null.
* @param value the value to assert if null
* @param message the message to display if value is not null
* @param The generic type of the value to assert if null
* @return the value
*/
public static T assertNull(T value, String message) {
if (value != null)
throw new IllegalStateException(message);
return value;
}
/**
* Throws an IllegalStateException when the given value is null.
* @param value the value to assert if not null
* @param message the message to display if value is null
* @param The generic type of the value to assert if not null
* @return the value
*/
public static T assertNotNull(T value, String message) {
if (value == null)
throw new IllegalStateException(message);
return value;
}
/**
* Throws an IllegalStateException when the given value is not true.
* @param value the value to assert if true
* @param message the message to display if the value is false
* @return the value
*/
public static Boolean assertTrue(Boolean value, String message) {
if (!Boolean.valueOf(value))
throw new IllegalStateException(message);
return value;
}
/**
* Throws an IllegalStateException when the given value is not false.
* @param value the value to assert if false
* @param message the message to display if the value is false
* @return the value
*/
public static Boolean assertFalse(Boolean value, String message) {
if (Boolean.valueOf(value))
throw new IllegalStateException(message);
return value;
}
/**
* Throws an IllegalStateException when the given values are not equal.
* @param exp The expected value
* @param was The actual value
* @param message The message to display if the compared values are not equal
* @param The generic type of the expected value
* @param The generic type of the actual value
* @return The actual value
*/
public static T assertEquals(T exp, T was, String message) {
assertNotNull(exp, message);
assertNotNull(was, message);
assertTrue(exp.equals(was), message);
return was;
}
/**
* Throws an IllegalStateException when the given values are not equal.
* @param exp The expected value
* @param was The actual value
* @param message The message to display if the compared values are not equal
* @param The generic type of the expected value
* @param The generic type of the actual value
* @return The actual value
*/
public static T assertSame(T exp, T was, String message) {
assertNotNull(exp, message);
assertNotNull(was, message);
assertTrue(exp == was, message);
return was;
}
}