/*license*\
XBN-Java: Copyright (C) 2014, Jeff Epstein (aliteralmind __DASH__ github __AT__ yahoo __DOT__ com)
This software is dual-licensed under the:
- Lesser General Public License (LGPL) version 3.0 or, at your option, any later version;
- Apache Software License (ASL) version 2.0.
Either license may be applied at your discretion. More information may be found at
- http://en.wikipedia.org/wiki/Multi-licensing.
The text of both licenses is available in the root directory of this project, under the names "LICENSE_lgpl-3.0.txt" and "LICENSE_asl-2.0.txt". The latest copies may be downloaded at:
- LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt
- ASL 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt
\*license*/
package com.github.xbn.examples.lang.non_xbn;
/**
<p><i>Results in an intentional exception</i> -- Demonstration of "if an object is null, throw an NullPointerException, otherwise throw the cause".</p>
<p>{@code java com.github.xbn.examples.lang.non_xbn.ExceptionHandlingXmpl}</p>
* @since 0.1.0
* @author Copyright (C) 2014, Jeff Epstein ({@code aliteralmind __DASH__ github __AT__ yahoo __DOT__ com}), dual-licensed under the LGPL (version 3.0 or later) or the ASL (version 2.0). See source code for details. <a href="http://xbnjava.aliteralmind.com">{@code http://xbnjava.aliteralmind.com}</a>, <a href="https://github.com/aliteralmind/xbnjava">{@code https://github.com/aliteralmind/xbnjava}</a>
**/
public class ExceptionHandlingXmpl {
public static final void main(String[] ignored) {
//doTheThingInTheThing(null);
doTheThingInTheThing2(null);
}
public static final void doTheThingInTheThing(Object thing_thatMustBeNNull) {
try {
String sToString = thing_thatMustBeNNull.toString();
System.out.println(sToString);
} catch(RuntimeException rx) {
if(thing_thatMustBeNNull == null) {
throw new NullPointerException("thing_thatMustBeNNull");
}
throw rx;
}
}
public static final void doTheThingInTheThing2(Object thing_thatMustBeNNull) {
try {
String sToString = thing_thatMustBeNNull.toString();
System.out.println(sToString);
} catch(RuntimeException rx) {
throw nullOrReturnCause(thing_thatMustBeNNull, "thing_thatMustBeNNull", null, rx);
}
}
public static final RuntimeException nullOrReturnCause(Object objToTest, String str_name, Object xtra_errInfo, RuntimeException cause) {
if(cause == null) {
throw new NullPointerException("cause");
}
nnull(false, objToTest, str_name, xtra_errInfo);
return cause;
}
public static final void nnull(boolean is_nullOk, Object objToTest, String str_name, Object xtra_errInfo) {
if(objToTest == null && !is_nullOk) {
throw new NullPointerException(str_name + " is null (is_nullOk is false)" +
((xtra_errInfo == null) ? "" : " -- Extra info: " + xtra_errInfo));
}
}
}