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package com.sun.enterprise.admin.util;
import com.sun.enterprise.admin.util.Assert;
import com.sun.enterprise.admin.util.AssertImpl;
import com.sun.enterprise.admin.util.Validator;
import com.sun.enterprise.admin.util.ValidatorResult;
/**
Use ArgChecker to check method parameters
<BR>Example usage:
<BR>ArgChecker.check( name != null, "null name" );
<BR>ArgChecker.check( index, 0, numItems, "index" );
<BR>ArgChecker.check( str, "userName");
<BR>ArgChecker.check( str, minimumStringLength, "userName");
<BR>ArgChecker.checkValid(parameter, "parameter-name");
*/
public class ArgChecker
{
/*
We've made this 'final' because we will never disable checks
during development. We *may* change it during release, since
an IllegalArgumentException could result in the killing of a process,
since RuntimeExceptions are not generally caught.
don't change until we ship (and then only maybe)
*/
private final static boolean sChecksEnabled = true;
private final static AssertImpl sImpl;
static
{
// need to do this in a static block to guarantee the
// setWantStackTrace() call
sImpl = new AssertImpl("ArgChecker Failure", AssertImpl.sIllegalArgument);
sImpl.setWantStackTrace(false);
}
private ArgChecker()
{
Assert.assertit(false, "You can't call the ArgChecker constructor!");
}
/**
If expression is false, take appropriate action to note the failure.
<p>
If expression is true, do nothing.
@param b boolean derived from callers expression.
@param msg message to be added to IllegalArgumentException upon failure
@throws IllegalArgumentException if b is false
*/
static public final void check( boolean b, Object msg )
throws IllegalArgumentException
{
if ( sChecksEnabled )
{
sImpl.assertIt(b, msg);
}
}
/**
Checks that the specified value is in a specified range.
<p>
A convenience method which calls checkRange()
@see #checkRange
@param value the value to be range-checked
@param min minimum value. value must be >= min
@param max maximum value. value must be <= max
@param userMsg additional user message (optional) to be included
@throws IllegalArgumentException if the specified value is not in the specified range.
*/
public static final void check(long value, long min, long max,
Object userMsg)
throws IllegalArgumentException
{
checkRange(value, min, max, userMsg);
}
/**
Checks that the specified value is in a specified range.
<p>
The test done is ( value >= min && value <= max )
If the test fails, then a descriptive string is generated
which lists the value together with the min and max and
user-specified message.
@param value the value to be range-checked
@param min minimum value. value must be >= min
@param max maximum value. value must be <= max
@param userMsg additional user message (optional) to be included
@throws IllegalArgumentException if the specified value is not in the specified range.
*/
public static final void checkRange(long value, long min, long max,
Object userMsg)
throws IllegalArgumentException
{
if ( sChecksEnabled )
{
sImpl.assertRange(value, min, max, userMsg);
}
}
/**
Checks that the object is valid generically by using a Validation
object.<p>
If the validation fails, then the check fails as with other checks.
@param object the value to be validated
@param name name of the object to be validated
@param validator validation object to validate the object
@throws IllegalArgumentException if validator says that object is NOT valid
*/
public static void checkValid(Object object,
String name,
Validator validator)
throws IllegalArgumentException
{
if ( sChecksEnabled )
{
sImpl.assertValid(object, name, validator);
}
}
/**
Checks that the object is valid generically by using a Validation object.
<p>
Convenience method. Calls checkValid().
@see checkValid(Object, String, IValidator)
@param object the value to be validated
@param name name of the object to be validated
@param validator validation object to validate the object
@throws IllegalArgumentException if validator says that object is NOT valid
*/
public static void check(Object object,
String name,
Validator validator)
throws IllegalArgumentException
{
checkValid(object, name, validator);
}
/**
Check that the object is valid.
Calls check( object, name, validator ) where validator is either
the non-null validator or the object itself, if the object implements
IValidator.
@param object the value to be validated
@param name name of the object to be validated
@throws IllegalArgumentException if validator says that object is NOT valid
*/
public static void checkValid(Object object, String name )
throws IllegalArgumentException
{
final Validator validator = (object instanceof Validator ) ?
(Validator)object :
BaseValidator.getInstance();
check( object, name, validator );
}
/**
Check that the object is valid.
Convenience method. Calls checkValid().
@see checkValid(Object, String)
@param object the value to be validated
@param name name of the object to be validated
@throws IllegalArgumentException if validator says that object is NOT valid
*/
public static void check(Object object, String name )
throws IllegalArgumentException
{
checkValid( object, name);
}
/**
Check the String with the standard StringValidator
@param checkMe a String to check
@param name The name of the String
@throws IllegalArgumentException if checkMe is null or zero-length
*/
public static void check(String checkMe, String name)
throws IllegalArgumentException
{
check(checkMe, name, StringValidator.getInstance());
}
/**
Check the String with a custom StringValidator
@param checkMe a String to check
@param minimumLength The minimum acceptable length of the String to allow
@param name The name of the String
@throws IllegalArgumentException if checkMe is null or zero-length
*/
public static void check(String checkMe, int minimumLength, String name)
throws IllegalArgumentException
{
check(checkMe, name, new StringValidator(minimumLength));
}
}
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