public void execute()

in src/main/java/org/apache/jackrabbit/filevault/maven/packaging/mojo/CheckSignatureMojo.java [129:175]
40 lines of code
9 McCabe index (conditional complexity)

    public void execute() throws MojoExecutionException, MojoFailureException {
        if (skipCheckSignature) {
            getLog().info("Skipping signature check.");
            return;
        }
        if (signature == null) {
            getLog().info("No signature defined. Skipping signature check.");
            return;
        }
        
        try {
            getLog().info("Checking unresolved references to " + signature);

            org.eclipse.aether.artifact.Artifact artifact = new DefaultArtifact(signature.getGroupId(),signature.getArtifactId(), "signature", signature.getVersion());
            File signatureFile = AbstractMetadataPackageMojo.resolveArtifact(artifact, repoSystem, repoSession, repositories);
            // just check code from this module
            final Set<String> ignoredPackages = buildPackageList();

            if (ignores != null) {
                for (String ignore : ignores) {
                    if (ignore == null) {
                        continue;
                    }
                    ignoredPackages.add(ignore.replace('.', '/'));
                }
            }

            if (getLog().isDebugEnabled()) {
                getLog().debug(ignoredPackages.toString());
            }

            try (InputStream signatureInput = new FileInputStream(signatureFile)) {
                final SignatureChecker signatureChecker = new SignatureChecker(signatureInput,
                        ignoredPackages, new MavenLogger(getLog()));
                signatureChecker.setCheckJars(true);
                signatureChecker.setSourcePath(Collections.singletonList(new File(project.getBuild().getSourceDirectory())));
                signatureChecker.process(getEmbeddeds().toArray(new File[0]));

                if (signatureChecker.isSignatureBroken()) {
                    throw new MojoFailureException(
                            "Signature errors found. Verify them and put @IgnoreJRERequirement on them.");
                }
            }
        } catch (IOException e) {
            throw new MojoExecutionException("Failed to check signatures", e);
        }
    }