public class Preconditions extends Object
Constructor and Description |
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Preconditions() |
Modifier and Type | Method and Description |
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static void |
checkArgument(boolean expression,
Object errorMessage)
Ensures the truth of an expression involving one or more parameters to the calling method.
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static <T> T |
checkNotNull(T reference,
String errorMessageTemplate,
Object... errorMessageArgs)
Ensures that an object reference passed as a parameter to the calling method is not null.
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public static <T> T checkNotNull(T reference, String errorMessageTemplate, Object... errorMessageArgs)
reference
- an object referenceerrorMessageTemplate
- a template for the exception message should the check fail. The
message is formed by replacing each %s
placeholder in the template with an
argument. These are matched by position - the first %s
gets errorMessageArgs[0]
, etc. Unmatched arguments will be appended to the formatted message in
square braces. Unmatched placeholders will be left as-is.errorMessageArgs
- the arguments to be substituted into the message template. Arguments
are converted to strings using String.valueOf(Object)
.NullPointerException
- if reference
is nullpublic static void checkArgument(boolean expression, Object errorMessage)
expression
- a boolean expressionerrorMessage
- the exception message to use if the check fails; will be converted to a
string using String.valueOf(Object)
IllegalArgumentException
- if expression
is falseCopyright © 2016–2017. All rights reserved.