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66 lines
2.6 KiB
Java
66 lines
2.6 KiB
Java
/****************************************************************************
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* This software is part of the gCube Project.
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* Site: http://www.gcube-system.org/
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****************************************************************************
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* The gCube/gCore software is licensed as Free Open Source software
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* conveying to the EUPL (http://ec.europa.eu/idabc/eupl).
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* The software and documentation is provided by its authors/distributors
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* "as is" and no expressed or
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* implied warranty is given for its use, quality or fitness for a
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* particular case.
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****************************************************************************
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* Filename: Assertion.java
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****************************************************************************
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* @author <a href="mailto:daniele.strollo@isti.cnr.it">Daniele Strollo</a>
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***************************************************************************/
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package org.gcube.resourcemanagement.support.server.utils;
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import java.io.Serializable;
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/**
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* General purpose assertion handler.
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* Assertion can be generalized to check a boolean expression and
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* to raise an exception in correspondence to a failure happening
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* during checking.
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* <pre>
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* <b>Example:</b>
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*
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* <b>Assertion</b><<i>TheExceptionType</i>> assertion = new Assertion<ParamException> ();
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* assertion.<b>validate</b> (param != null, new <i>TheExceptionType</i>("invalid parameter null"));
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*
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* <b>or</b>, in a more compact form:
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* <i>// The exception to throw in case of failure
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* // during the evaluation of the expected condition</i>
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* new <b>Assertion</b><<i>TheExceptionType</i>>().<b>validate</b>(
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* i>5, <i>// The expected boolean <b>condition</b></i>
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* new <i>TheExceptionType</i>("Parameter must be greater than 5")); <i>//The <b>error</b> message</i>
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*
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* </pre>
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*
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* @author Daniele Strollo (ISTI-CNR)
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*/
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public class Assertion <T extends Throwable> implements Serializable {
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private static final long serialVersionUID = -2007903339251667541L;
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/**
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* Makes an assertion and if the expression evaluation fails, throws an
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* exception of type T.
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* <pre>
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* Example:
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* new Assertion<MyException>().validate(whatExpected, new MyException("guard failed"));
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* </pre>
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* @param assertion the boolean expression to evaluate
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* @param exc the exception to throw if the condition does not hold
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* @throws T the exception extending {@link java.lang.Throwable}
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*/
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public final void validate(final boolean assertion, final T exc)
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throws T {
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// TOCHECK junit.framework.Assert.assertTrue(assertion);
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if (!assertion) {
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throw exc;
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}
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}
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}
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