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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.LicenseTemplate;

/**
 * This class provides an entry point to all the GitLab API licenses calls.
 * @see Licenses API
 */
public class LicenseTemplatesApi extends AbstractApi {

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

    /**
     * Get a List of all license templates.
     *
     * GitLab Endpoint: GET /templates/licenses
     *
     * @return a List of LicenseTemplate instances
     * @throws GitLabApiException if any exception occurs
     */
    public List getLicenseTemplates() throws GitLabApiException {
        return (getLicenseTemplates(false, getDefaultPerPage()).all());
    }

    /**
     * Get a Stream of all license templates.
     *
     * GitLab Endpoint: GET /templates/licenses
     *
     * @return a Stream of LicenseTemplate instances
     * @throws GitLabApiException if any exception occurs
     */
    public Stream getLicenseTemplatesStream() throws GitLabApiException {
        return (getLicenseTemplates(false, getDefaultPerPage()).stream());
    }

    /**
     * Get a Pager of all license templates.
     *
     * GitLab Endpoint: GET /templates/licenses
     *
     * @param itemsPerPage the number of LicenseTemplate instances that will be fetched per page
     * @return a Pager of LicenseTemplate instances
     * @throws GitLabApiException if any exception occurs
     */
    public Pager getLicenseTemplates(int itemsPerPage) throws GitLabApiException {
        return (getLicenseTemplates(false, itemsPerPage));
    }

    /**
     * Get a List of popular license templates.
     *
     * GitLab Endpoint: GET /templates/licenses?popular=true
     *
     * @return a List of popular LicenseTemplate instances
     * @throws GitLabApiException if any exception occurs
     */
    public List getPopularLicenseTemplates() throws GitLabApiException {
        return (getLicenseTemplates(true, getDefaultPerPage()).all());
    }

    /**
     * Get a Stream of popular license templates.
     *
     * GitLab Endpoint: GET /templates/licenses?popular=true
     *
     * @return a Stream of popular LicenseTemplate instances
     * @throws GitLabApiException if any exception occurs
     */
    public Stream getPopularLicenseTemplatesStream() throws GitLabApiException {
        return (getLicenseTemplates(true, getDefaultPerPage()).stream());
    }

    /**
     * Get a Pager of license templates.
     *
     * GitLab Endpoint: GET /templates/licenses
     *
     * @param popular if true, returns only popular licenses.
     * @param itemsPerPage the number of LicenseTemplate instances that will be fetched per page
     * @return a Pager of LicenseTemplate instances
     * @throws GitLabApiException if any exception occurs
     */
    public Pager getLicenseTemplates(Boolean popular, int itemsPerPage) throws GitLabApiException {
        GitLabApiForm formData = new GitLabApiForm().withParam("popular", popular);
        return (new Pager(this, LicenseTemplate.class, itemsPerPage, formData.asMap(), "templates", "licenses"));
    }

    /**
     * Get a single license template.
     *
     * GitLab Endpoint: GET /templates/licenses/:key
     *
     * @param key The key of the license template
     * @return a LicenseTemplate instance
     * @throws GitLabApiException if any exception occurs
     */
    public LicenseTemplate getLicenseTemplate(String key) throws GitLabApiException {
        Response response = get(Response.Status.OK, null, "licenses", key);
        return (response.readEntity(LicenseTemplate.class));
    }

    /**
     * Get a single license template as the value of an Optional.
     *
     * GitLab Endpoint: GET /templates/licenses/:key
     *
     * @param key The key of the license template
     * @return a single license template as the value of an Optional.
     */
    public Optional getOptionalLicenseTemplate(String key) {
        try {
            return (Optional.ofNullable(getLicenseTemplate(key)));
        } catch (GitLabApiException glae) {
            return (GitLabApi.createOptionalFromException(glae));
        }
    }
}