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GitLab4J-API (gitlab4j-api) provides a full featured Java client library for working with GitLab repositories and servers via the GitLab REST API.

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package org.gitlab4j.api;

import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;

import javax.ws.rs.core.Response;

import org.gitlab4j.api.models.License;

/**
 * This class provides an entry point to all the GitLab API license calls.
 * @see License API
 */
public class LicenseApi extends AbstractApi {

    public LicenseApi(GitLabApi gitLabApi) {
        super(gitLabApi);
    }

    /**
     * Retrieve information about the current license.
     *
     * GitLab Endpoint: GET /license
     *
     * @return a License instance holding info about the current license
     * @throws GitLabApiException if any exception occurs
     */
    public License getLicense() throws GitLabApiException {
        Response response = get(Response.Status.OK, null, "license");
        return (response.readEntity(License.class));
    }

    /**
     * Retrieve information about the current license as the value of an Optional.
     *
     * GitLab Endpoint: GET /license
     *
     * @return the current license as the value of an Optional.
     */
    public Optional getOptionalLicense() {
        try {
            return (Optional.ofNullable(getLicense()));
        } catch (GitLabApiException glae) {
            return (GitLabApi.createOptionalFromException(glae));
        }
    }

    /**
     * Retrieve information about all licenses.
     *
     * GitLab Endpoint: GET /licenses
     *
     * @return a List of License instances
     * @throws GitLabApiException if any exception occurs
     */
    public List getAllLicenses() throws GitLabApiException {
        return (getAllLicenses(getDefaultPerPage()).all());
    }

    /**
     * Get a Stream of all licenses.
     *
      GitLab Endpoint: GET /licenses
     *
     * @return a Stream of License instances
     * @throws GitLabApiException if any exception occurs
     */
    public Stream getAllLicensesStream() throws GitLabApiException {
        return (getAllLicenses(getDefaultPerPage()).stream());
    }

    /**
     * Get a Pager of all licenses.
     *
     * GitLab Endpoint: GET /licenses
     *
     * @param itemsPerPage the number of LicenseTemplate instances that will be
     *                     fetched per page
     * @return a Pager of license template
     * @throws GitLabApiException if any exception occurs
     */
    public Pager getAllLicenses(int itemsPerPage) throws GitLabApiException {
        return (new Pager(this, License.class, itemsPerPage, null, "licenses"));
    }

    /**
     * Add a new license.
     *
     * GitLab Endpoint: POST /license
     *
     * @param licenseString the license string for the license
     * @return a License instance for the added license
     * @throws GitLabApiException if any exception occurs
     */
    public License addLicense(String licenseString) throws GitLabApiException {
        GitLabApiForm formData = new GitLabApiForm().withParam("license", licenseString, true);
        Response response = post(Response.Status.CREATED, formData, "license");
        return (response.readEntity(License.class));
    }

    /**
     * Deletes a license.
     *
     * GitLab Endpoint: DELETE /license/:id
     *
     * @param licenseId the ID of the license to delete
     * @return a License instance for the delete license
     * @throws GitLabApiException if any exception occurs
     */
    public License deleteLicense(Long licenseId) throws GitLabApiException {
        Response response = delete(Response.Status.OK, null, "license", licenseId);
        return (response.readEntity(License.class));
    }
}