Findbugs for Gradle

findbugs.gradle

configurations{
	findbugsConf
}

def convention = new FindBugsPluginConvention(project)
project.convention.plugins.findbugs = convention

class FindBugsPluginConvention{
	def reportPath;
	def version;
    def reportFileName;
    def reportType;

	def emma(Closure close){
		close.delegate = this;
		close.run()
	}

	FindBugsPluginConvention(Project project){
		reportPath 			= "${project.buildDir}/reports/findbugs"
        version             = "1.3.9"
        reportType          = "html"
        reportFileName      = "findbugs_result.html"
	}
}

task findbugs(dependsOn : jar) << {
    println 'Running findbugs static code analysis'
    ant {
        taskdef(name: 'findbugs', classname: 'edu.umd.cs.findbugs.anttask.FindBugsTask', classpath: configurations.findbugsConf.asPath)
        findbugsJarFiles = configurations.findbugsConf.resolve()

        findbugsHome = 'NOT_FOUND'
        findbugsJarFiles.each() {
            jarPath ->
            if (jarPath.getName().equalsIgnoreCase("findbugs-${convention.version}.jar")) {
                findbugsHome = jarPath.getParentFile()
            }
        }
        if (new File("$findbugsHome/findbugs.jar").exists() == false) {
            findbugsJarFiles.each() {
                jarPath ->
                switch(jarPath.getName()){
                    case "findbugs-${convention.version}.jar":
                        new File("${jarPath.getParentFile()}/findbugs.jar") << new File(jarPath.toString()).readBytes()
                        break
                    case "bcel-${convention.version}.jar" :
                        new File("${findbugsHome}/bcel.jar") << new File(jarPath.toString()).readBytes()
                        break

                    case"findbugs-ant-${convention.version}.jar" :
                        new File("${findbugsHome}/findbugs-ant.jar") << new File(jarPath.toString()).readBytes()
                        break
                    case"jFormatString-${convention.version}.jar" :
                        new File("${findbugsHome}/jFormatString.jar") << new File(jarPath.toString()).readBytes()
                        break
                    case"coreplugin-${convention.version}.jar" :
                        new File("${findbugsHome}/coreplugin.jar") << new File(jarPath.toString()).readBytes()
                        break
                    case"jsr305-${convention.version}.jar" :
                        new File("${findbugsHome}/jsr305.jar") << new File(jarPath.toString()).readBytes()
                        break
                    default:
                        new File("${findbugsHome}/${jarPath.getName()}") << new File(jarPath.toString()).readBytes()
                }
            }
        }
        mkdir dir: convention.reportPath
        findbugs(home: findbugsHome, output: convention.reportType, outputFile: "${convention.reportPath}/${convention.reportFileName}", failOnError: true) {
            sourcePath(path: sourceSets.main.java)
            "class"(location: "$buildDir/libs/")
        }
    }
}