require

Lightweight assertion library with predefined messages.

CHANGELOG.md

Methods

All methods produce exception IllegalArgumentException in the case if statement false. All methods return given value back without any modifications.

Method	Description
Require.nonNull	Check if value is not null.
Require.nonBlank	Check if value is not null and not blank, contains any character different from whitespace
Require.nonEmpty	Check if string or collection is not null and not empty
Require.length	Check if value is not null and has length between minLength and maxLength
Require.maxLength	Check if value is not null and has length between 0 and maxLength
Require.minLength	Check if value is not null and has length more then minLength
Require.nonBlankMaxLength	Check if value is not blank and has length between 1 and maxLength
Require.format	Check if value is not null and has match regexp pattern format
Require.positive	Check if numeric value is not null and positive
Require.negative	Check if numeric value is not null and negative
Require.gtThanZero	Check if numeric is not null and grate than 0
Require.lsThanZero	Check if numeric is not null and less than 0

Example

public final class RequestId {

    private final String value;

    public RequestId(@Nullable final String value) {
        this.value = Require.nonBlank(value, "requestId");
    }

    @Nonnull
    public String value() {
        return value;
    }
}

Usage

Library is available on MavenCentral.

Apache Maven:

<dependency>
  <groupId>com.github.ilubenets</groupId>
  <artifactId>require</artifactId>
  <version>1.3</version>
</dependency>

Gradle Groovy DSL:

dependencies {
    implementation 'com.github.ilubenets:require:1.3'
}