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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.stream.Stream;

import javax.ws.rs.core.GenericType;
import javax.ws.rs.core.Response;

import org.gitlab4j.api.GitLabApi.ApiVersion;
import org.gitlab4j.api.models.SystemHook;

/**
 * This class implements the client side API for the GitLab System Hooks Keys API calls.
 */
public class SystemHooksApi extends AbstractApi {

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

    /**
     * Get a list of all system hooks. This method requires admin access.
     *
     * GitLab Endpoint: GET /hooks
     *
     * @return a list of SystemHookEvent
     * @throws GitLabApiException if any exception occurs
     */
    public List getSystemHooks() throws GitLabApiException {
        return (getSystemHooks(getDefaultPerPage()).all());
    }

    /**
     * Get a list of all system hooks using the specified page and per page settings.
     * This method requires admin access.
     *
     * GitLab Endpoint: GET /hooks
     *
     * @param page the page to get
     * @param perPage the number of deploy keys per page
     * @return the list of SystemHookEvent in the specified range
     * @throws GitLabApiException if any exception occurs
     */
    public List getSystemHooks(int page, int perPage) throws GitLabApiException {
        Response response = get(Response.Status.OK, getPageQueryParams(page, perPage), "hooks");
        return (response.readEntity(new GenericType>() {}));
    }

    /**
     * Get a Pager of all system hooks. This method requires admin access.
     *
     * GitLab Endpoint: GET /hooks
     *
     * @param itemsPerPage the number of SystemHookEvent instances that will be fetched per page
     * @return a Pager of SystemHookEvent
     * @throws GitLabApiException if any exception occurs
     */
    public Pager getSystemHooks(int itemsPerPage) throws GitLabApiException {
        return (new Pager(this, SystemHook.class, itemsPerPage, null, "hooks"));
    }

    /**
     * Get a Stream of all system hooks. This method requires admin access.
     *
     * GitLab Endpoint: GET /hooks
     *
     * @return a Stream of SystemHookEvent
     * @throws GitLabApiException if any exception occurs
     */
    public Stream getSystemHookStream() throws GitLabApiException {
        return (getSystemHooks(getDefaultPerPage()).stream());
    }

    /**
     * Add a new system hook. This method requires admin access.
     *
     *  GitLab Endpoint: POST /hooks
     *
     * @param url the hook URL, required
     * @param token secret token to validate received payloads, optional
     * @param pushEvents when true, the hook will fire on push events, optional
     * @param tagPushEvents when true, the hook will fire on new tags being pushed, optional
     * @param enableSslVerification do SSL verification when triggering the hook, optional
     * @return an SystemHookEvent instance with info on the added system hook
     * @throws GitLabApiException if any exception occurs
     */
    public SystemHook addSystemHook(String url, String token, Boolean pushEvents,
            Boolean tagPushEvents,  Boolean enableSslVerification) throws GitLabApiException {

        SystemHook systemHook = new SystemHook().withPushEvents(pushEvents)
            .withTagPushEvents(tagPushEvents)
            .withEnableSslVerification(enableSslVerification);

        return addSystemHook(url, token, systemHook);
    }

    /**
     * Add a new system hook. This method requires admin access.
     *
     *  GitLab Endpoint: POST /hooks
     *
     * @param url the hook URL, required
     * @param token secret token to validate received payloads, optional
     * @param systemHook the systemHook to create
     * @return an SystemHookEvent instance with info on the added system hook
     * @throws GitLabApiException if any exception occurs
     */
    public SystemHook addSystemHook(String url, String token, SystemHook systemHook) throws GitLabApiException {

        if (url == null) {
            throw new RuntimeException("url cannot be null");
        }

        GitLabApiForm formData = new GitLabApiForm()
                .withParam("url", url, true)
                .withParam("token", token)
                .withParam("push_events", systemHook.getPushEvents())
                .withParam("tag_push_events", systemHook.getTagPushEvents())
                .withParam("merge_requests_events", systemHook.getMergeRequestsEvents())
                .withParam("repository_update_events", systemHook.getRepositoryUpdateEvents())
                .withParam("enable_ssl_verification", systemHook.getEnableSslVerification());
        Response response = post(Response.Status.CREATED, formData, "hooks");
        return (response.readEntity(SystemHook.class));
    }

    /**
     * Deletes a system hook. This method requires admin access.
     *
     *  GitLab Endpoint: DELETE /hooks/:hook_id
     *
     * @param hook the SystemHook instance to delete
     * @throws GitLabApiException if any exception occurs
     */
    public void deleteSystemHook(SystemHook hook) throws GitLabApiException {

        if (hook == null) {
            throw new RuntimeException("hook cannot be null");
        }

        deleteSystemHook(hook.getId());
    }

    /**
     * Deletes a system hook. This method requires admin access.
     *
     * GitLab Endpoint: DELETE /hooks/:hook_id
     *
     * @param hookId the ID of the system hook to delete
     * @throws GitLabApiException if any exception occurs
     */
    public void deleteSystemHook(Long hookId) throws GitLabApiException {

        if (hookId == null) {
            throw new RuntimeException("hookId cannot be null");
        }

        Response.Status expectedStatus = (isApiVersion(ApiVersion.V3) ? Response.Status.OK : Response.Status.NO_CONTENT);
        delete(expectedStatus, null, "hooks", hookId);
    }

    /**
     * Test a system hook. This method requires admin access.
     *
     * GitLab Endpoint: GET /hooks/:hook_id
     *
     * @param hook the SystemHookEvent instance to test
     * @throws GitLabApiException if any exception occurs
     */
    public void testSystemHook(SystemHook hook) throws GitLabApiException {

        if (hook == null) {
            throw new RuntimeException("hook cannot be null");
        }

        testSystemHook(hook.getId());
    }

    /**
     * Test a system hook. This method requires admin access.
     *
     * GitLab Endpoint: GET /hooks/:hook_id
     *
     * @param hookId the ID of the system hook to test
     * @throws GitLabApiException if any exception occurs
     */
    public void testSystemHook(Long hookId) throws GitLabApiException {

        if (hookId == null) {
            throw new RuntimeException("hookId cannot be null");
        }

        get(Response.Status.OK, null, "hooks", hookId);
    }
}