build.gradle

plugins {
    id 'com.diffplug.spotless' version '6.25.0' apply false
}

subprojects {
    apply plugin: 'java'
    apply plugin: 'com.diffplug.spotless'

    group = 'com.auction'
    version = '1.0-SNAPSHOT'

    java {
        sourceCompatibility = JavaVersion.VERSION_21
        targetCompatibility = JavaVersion.VERSION_21
    }

    tasks.withType(JavaCompile).configureEach {
        options.encoding = 'UTF-8'
    }

    repositories {
        mavenCentral()
    }

    dependencies {
        testImplementation 'org.junit.jupiter:junit-jupiter:5.10.2'
        testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
    }

    tasks.withType(Test).configureEach {
        useJUnitPlatform()
    }

    spotless {
        java {
            target 'src/**/*.java'
            googleJavaFormat('1.35.0')
            removeUnusedImports()
            formatAnnotations()
        }
    }

    tasks.register('checkGoogleJavaStyleHardRules') {
        def javaSources = fileTree(projectDir) {
            include 'src/**/*.java'
            exclude '**/build/**'
        }
        inputs.files(javaSources)

        doLast {
            def violations = []
            javaSources.files.each { source ->
                if (!source.name.endsWith('.java')) {
                    return
                }
                def hasPackage = false
                source.eachLine { line, number ->
                    if (number <= 5 && line ==~ /\s*package\s+[^;]+;/) {
                        hasPackage = true
                    }
                    if (line.contains('\t')) {
                        violations << "${source}:${number}: tab characters are not allowed"
                    }
                    if (line ==~ /\s*import\s+(static\s+)?[^;]*\.\*;/) {
                        violations << "${source}:${number}: wildcard imports are not allowed"
                    }
                    if (!(line ==~ /\s*(package|import)\s+.*/) && line.length() > 100) {
                        violations << "${source}:${number}: line exceeds 100 columns"
                    }
                    if (line =~ /[âÃ�]/) {
                        violations << "${source}:${number}: possible encoding-damaged text"
                    }
                }
                if (!hasPackage) {
                    violations << "${source}:1: missing package declaration"
                }
            }
            if (!violations.isEmpty()) {
                throw new GradleException(
                        "Google Java Style hard-rule violations:\n" + violations.join('\n'))
            }
        }
    }

    tasks.named('check') {
        dependsOn tasks.named('spotlessCheck')
        dependsOn tasks.named('checkGoogleJavaStyleHardRules')
    }
}