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package com.sun.enterprise.tools.common.util;
import com.sun.enterprise.tools.common.util.diagnostics.CallerInfo;
import com.sun.enterprise.tools.common.util.diagnostics.CallerInfoException;
/**
A class for assertion checking
@version 1.00 1 May 1999
@version 1.10 5 June 2000
@author Byron Nevins
*/
public class Assertion
{
/**
Check an assertion
@param b the condition to check
@param s a string describing the check
@throws Assertion.Failure if condition not true
*/
public static void check(boolean b, String s)
{ if (doCheck && !b)
toss(s);
}
/**
Check an assertion
@param b the condition to check
@throws Assertion.Failure if condition not true
*/
public static void check(boolean b)
{ if (doCheck && !b)
toss();
}
/**
Check an assertion
@param obj an object to check
@param s a string describing the check
@throws Assertion.Failure if object is null
*/
public static void check(Object obj, String s)
{ if (doCheck && obj == null)
toss(s);
}
/**
Check an assertion
@param checkMe a String to check for length > 0
@param s a string describing the check
@throws Assertion.Failure if checkMe is null or zero-length
*/
public static void check(String checkMe, String s)
{ if (doCheck && (checkMe == null || checkMe.length() <= 0))
toss(s);
}
/**
Check an assertion
@param checkMe a String to check for length > 0
@throws Assertion.Failure if checkMe is null or zero-length
*/
public static void check(String checkMe)
{ if (doCheck && (checkMe == null || checkMe.length() <= 0))
toss();
}
/**
Check an assertion
@param obj an object to check
@throws Assertion.Failure if object is null
*/
public static void check(Object obj)
{ if (doCheck && obj == null)
toss();
}
/**
Check an assertion
@param x a number
@param s a string describing the check
@throws Assertion.Failure if number is 0
*/
public static void check(double x, String s)
{ if (doCheck && x == 0)
toss(s);
}
/**
Check an assertion
@param x a number
@throws Assertion.Failure if number is 0
*/
public static void check(double x)
{ if (doCheck && x == 0)
toss();
}
/**
Check an assertion
@param x a number
@param s a string describing the check
@throws Assertion.Failure if number is 0
*/
public static void check(long x, String s)
{ if (doCheck && x == 0)
toss(s);
}
/**
Check an assertion
@param x a number
@throws Assertion.Failure if number is 0
*/
public static void check(long x)
{ if (doCheck && x == 0)
toss();
}
/**
Turn checking on or off
@param c true to turn checking on, false to turn checking off
*/
public static void setCheck(boolean c)
{ doCheck = c;
}
private static boolean doCheck = true;
/**
test stub
*/
public static void main(String[] args)
{ Assertion.check(args);
Assertion.check(args.length, "No command line arguments");//NOI18N
}
/////////////////////////////////////////////////////////////////////////
private static void toss()
{
toss(null);
}
/////////////////////////////////////////////////////////////////////////
private static void toss(String gripe)
{
String msg = "\nAssertion failed";//NOI18N
String ci = getCallerInfo();
if(ci != null)
{
msg += " at " + ci;//NOI18N
}
if(gripe != null)
msg += " --> " + gripe;//NOI18N
throw new Failure(msg);
}
/////////////////////////////////////////////////////////////////////////
private static String getCallerInfo()
{
try
{
CallerInfo ci = new CallerInfo( new Object[] { staticInstance });
return ci.toString();
}
catch(CallerInfoException e)
{
return null;
}
}
/////////////////////////////////////////////////////////////////////////
private static Assertion staticInstance = null;
static
{
staticInstance = new Assertion();
}
/////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////
public static class Failure extends RuntimeException
{
/**
@param gripe a description of the reason for the failure
*/
public Failure(String gripe)
{
super(gripe);
}
}
}
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