Equalizer

Java Helper class to create nice equals methods

License	The MIT License (MIT)
GroupId	com.github.tonivade
ArtifactId	equalizer
Last Version	0.3.0
Release Date	May 22, 2018
Type	jar
Description	Equalizer Java Helper class to create nice equals methods
Project URL	https://github.com/tonivade/equalizer
Source Code Management	https://github.com/tonivade/equalizer

Download equalizer

Filename	Size
equalizer-0.3.0.pom
equalizer-0.3.0.jar	2 KB
equalizer-0.3.0-sources.jar	1 KB
equalizer-0.3.0-javadoc.jar	20 KB

How to add to project

Apache Maven

<!-- https://jarcasting.com/artifacts/com.github.tonivade/equalizer/ -->
<dependency>
    <groupId>com.github.tonivade</groupId>
    <artifactId>equalizer</artifactId>
    <version>0.3.0</version>
</dependency>

Gradle Groovy

// https://jarcasting.com/artifacts/com.github.tonivade/equalizer/
implementation 'com.github.tonivade:equalizer:0.3.0'

Gradle Kotlin

// https://jarcasting.com/artifacts/com.github.tonivade/equalizer/
implementation ("com.github.tonivade:equalizer:0.3.0")

Apache Buildr

'com.github.tonivade:equalizer:jar:0.3.0'

Apache Ivy

<dependency org="com.github.tonivade" name="equalizer" rev="0.3.0">
  <artifact name="equalizer" type="jar" />
</dependency>

Groovy Grape

@Grapes(
@Grab(group='com.github.tonivade', module='equalizer', version='0.3.0')
)

Scala SBT

libraryDependencies += "com.github.tonivade" % "equalizer" % "0.3.0"

Leiningen

[com.github.tonivade/equalizer "0.3.0"]

Dependencies

test (2)

Group / Artifact	Type	Version
junit : junit	jar	4.12
nl.jqno.equalsverifier : equalsverifier	jar	1.7.5

Project Modules

There are no modules declared in this project.

Equalizer

Equalizer is a helper class in order to create nice equals method for your java classes.

There are some alternatives like commons-lang, guava or Object.equals, but all have the same problem:

@Override
public boolean equals(Object obj) {
    if (this == obj) {
        return true;
    }
    if (obj == null) {
        return false;
    }
    if (getClass() != obj.getClass()) {
        return false;
    }
    Data other = (Data) obj;
    return Objects.equals(this.id, other.id) && Objects.equals(this.value, other.value);
}

There are some boilerplate code you have to include previously to the fields comparison.

Equalizer tries to solve this problem:

@Override
public boolean equals(Object obj) {
    return equalizer(this)
        .append((one, other) -> Objects.equals(one.id, other.id))
        .append((one, other) -> Objects.equals(one.value, other.value))
        .applyTo(obj);
}

Versions

Version
0.3.0 May 22, 2018
0.2.0 Jun 26, 2016