In Java 15 Text Blocks are official and can be used just like an ordinary String. However, when they are used to represent a big chunk of text,
they should not be used directly in complex expressions, as it decreases the readability. In this case, it is better to extract the text block into a
variable or a field.
This rule reports an issue when a text block longer than a number of lines given as a parameter is directly used within a lambda expression.
Noncompliant code example
listOfString.stream()
.map(str -> !"""
<project>
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.mycompany.app</groupId>
<artifactId>my-app</artifactId>
<version>1</version>
</parent>
<groupId>com.mycompany.app</groupId>
<artifactId>my-module</artifactId>
<version>1</version>
</project>
""".equals(str));
Compliant solution
String myTextBlock = """
<project>
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.mycompany.app</groupId>
<artifactId>my-app</artifactId>
<version>1</version>
</parent>
<groupId>com.mycompany.app</groupId>
<artifactId>my-module</artifactId>
<version>1</version>
</project>
""";
listOfString.stream()
.map(str -> !myTextBlock.equals(str));
