private RepositoryPolicy merge()

in maven-resolver-impl/src/main/java/org/eclipse/aether/internal/impl/DefaultRemoteRepositoryManager.java [233:307]
66 lines of code
18 McCabe index (conditional complexity)

    private RepositoryPolicy merge(
            RepositorySystemSession session, RepositoryPolicy policy1, RepositoryPolicy policy2, boolean globalPolicy) {
        RepositoryPolicy policy;

        if (policy2 == null) {
            if (globalPolicy) {
                policy = merge(
                        policy1,
                        session.getArtifactUpdatePolicy(),
                        session.getMetadataUpdatePolicy(),
                        session.getChecksumPolicy());
            } else {
                policy = policy1;
            }
        } else if (policy1 == null) {
            if (globalPolicy) {
                policy = merge(
                        policy2,
                        session.getArtifactUpdatePolicy(),
                        session.getMetadataUpdatePolicy(),
                        session.getChecksumPolicy());
            } else {
                policy = policy2;
            }
        } else if (!policy2.isEnabled()) {
            if (globalPolicy) {
                policy = merge(
                        policy1,
                        session.getArtifactUpdatePolicy(),
                        session.getMetadataUpdatePolicy(),
                        session.getChecksumPolicy());
            } else {
                policy = policy1;
            }
        } else if (!policy1.isEnabled()) {
            if (globalPolicy) {
                policy = merge(
                        policy2,
                        session.getArtifactUpdatePolicy(),
                        session.getMetadataUpdatePolicy(),
                        session.getChecksumPolicy());
            } else {
                policy = policy2;
            }
        } else {
            String checksums = session.getChecksumPolicy();
            //noinspection StatementWithEmptyBody
            if (globalPolicy && checksums != null && !checksums.isEmpty()) {
                // use global override
            } else {
                checksums = checksumPolicyProvider.getEffectiveChecksumPolicy(
                        session, policy1.getChecksumPolicy(), policy2.getChecksumPolicy());
            }

            String artifactUpdates = session.getArtifactUpdatePolicy();
            //noinspection StatementWithEmptyBody
            if (globalPolicy && artifactUpdates != null && !artifactUpdates.isEmpty()) {
                // use global override
            } else {
                artifactUpdates = updatePolicyAnalyzer.getEffectiveUpdatePolicy(
                        session, policy1.getArtifactUpdatePolicy(), policy2.getArtifactUpdatePolicy());
            }
            String metadataUpdates = session.getMetadataUpdatePolicy();
            if (globalPolicy && metadataUpdates != null && !metadataUpdates.isEmpty()) {
                // use global override
            } else {
                metadataUpdates = updatePolicyAnalyzer.getEffectiveUpdatePolicy(
                        session, policy1.getMetadataUpdatePolicy(), policy2.getMetadataUpdatePolicy());
            }

            policy = new RepositoryPolicy(true, artifactUpdates, metadataUpdates, checksums);
        }

        return policy;
    }