[jira] [Created] (LANG-1551) EqualsBuilder with Lambdas

["Bruce Brouwer (Jira)" <ji...@apache.org>]

Bruce Brouwer created LANG-1551:
-----------------------------------

             Summary: EqualsBuilder with Lambdas
                 Key: LANG-1551
                 URL: https://issues.apache.org/jira/browse/LANG-1551
             Project: Commons Lang
          Issue Type: Improvement
          Components: lang.builder.*
    Affects Versions: 3.9
            Reporter: Bruce Brouwer


Has it been considered to use lambdas to make it easier to write equals methods? 
{code:java}
public boolean equals(final Object obj) {
  return new EqualsBuilder<MyClass>(this, obj)
    .append(it -> it.field)
    .appendSuper(super.equals(obj)
    .isEquals();
}{code}
I know this is incompatible with the current {{EqualsBuilder}} so maybe a new class, or something like this would work instead:
{code:java}
public boolean equals(final Object obj) {
 return EqualsBuilder.with(this, obj) // with returns a generic type similar to EqualsBuilder
   .append(it -> it.field)
   .appendSuper(super.equals(obj)
   .isEquals();
}{code}
It helps eliminate all the boilerplate code of checking object types and could even skip calling the lambdas if it already knew it was not equal. 



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