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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.Environment;

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

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

    /**
     * Get all environments for a given project.
     *
     * GitLab Endpoint: GET /projects/:id/environments
     *
     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
     * @return a List of Environment instances
     * @throws GitLabApiException if any exception occurs
     */
    public List getEnvironments(Object projectIdOrPath) throws GitLabApiException {
        return (getEnvironments(projectIdOrPath, getDefaultPerPage()).all());
    }

    /**
     * Get a Stream of all environments for a given project.
     *
     * GitLab Endpoint: GET /projects/:id/environments
     *
     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
     * @return a Stream of Environment instances
     * @throws GitLabApiException if any exception occurs
     */
    public Stream getEnvironmentsStream(Object projectIdOrPath) throws GitLabApiException {
        return (getEnvironments(projectIdOrPath, getDefaultPerPage()).stream());
    }

    /**
     * Get a Pager of all environments for a given project.
     *
     * GitLab Endpoint: GET /projects/:id/environments
     *
     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
     * @param itemsPerPage the number of Environment instances that will be fetched per page
     * @return a Pager of Environment instances
     * @throws GitLabApiException if any exception occurs
     */
    public Pager getEnvironments(Object projectIdOrPath, int itemsPerPage) throws GitLabApiException {
        return (new Pager(this, Environment.class, itemsPerPage, null,
                "projects", getProjectIdOrPath(projectIdOrPath), "environments"));
    }

    /**
     * Get a specific environment.
     *
     * GitLab Endpoint: GET /projects/:id/environments/:environment_id
     *
     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
     * @param environmentId the ID of the environment to get
     * @return an Environment instance
     * @throws GitLabApiException if any exception occurs
     */
    public Environment getEnvironment(Object projectIdOrPath, Integer environmentId) throws GitLabApiException {
	Response response = get(Response.Status.OK, null,
                "projects", getProjectIdOrPath(projectIdOrPath), "environments", environmentId);
	return (response.readEntity(Environment.class));
    }

    /**
     * Get a specific environment. as an Optional instance.
     *
     * GitLab Endpoint: GET /projects/:id/environments/:environment_id
     *
     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
     * @param environmentId the ID of the environment to get
     * @return the Environment as an Optional instance
     */
    public Optional getOptionalEnvironment(Object projectIdOrPath, Integer environmentId) {
	try {
	    return (Optional.ofNullable(getEnvironment(projectIdOrPath, environmentId)));
	} catch (GitLabApiException glae) {
	    return (GitLabApi.createOptionalFromException(glae));
	}
    }

    /**
     * Create a new environment with the given name and external_url.
     *
     * GitLab Endpoint:POST /projects/:id/environments
     *
     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
     * @param name the name of the environment
     * @param externalUrl the place to link to for this environment
     * @return the created Environment instance
     * @throws GitLabApiException if any exception occurs
     */
    public Environment createEnvironment(Object projectIdOrPath, String name, String externalUrl) throws GitLabApiException {
	GitLabApiForm formData = new GitLabApiForm().withParam("name", name, true).withParam("external_url", externalUrl);
	Response response = post(Response.Status.CREATED, formData,
                "projects", getProjectIdOrPath(projectIdOrPath), "environments");
	return (response.readEntity(Environment.class));
    }

    /**
     * Update an existing environment.
     *
     * GitLab Endpoint:POST /projects/:id/environments
     *
     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
     * @param environmentId the ID of the environment to update
     * @param name the name of the environment
     * @param externalUrl the place to link to for this environment
     * @return the created Environment instance
     * @throws GitLabApiException if any exception occurs
     */
    public Environment updateEnvironment(Object projectIdOrPath, Integer environmentId, String name, String externalUrl) throws GitLabApiException {
	GitLabApiForm formData = new GitLabApiForm().withParam("name", name).withParam("external_url", externalUrl);
	Response response = putWithFormData(Response.Status.OK, formData, formData,
                "projects", getProjectIdOrPath(projectIdOrPath), "environments", environmentId);
	return (response.readEntity(Environment.class));
    }

    /**
     * Delete an environment.
     *
     * GitLab Endpoint: DELETE /projects/:id/environments/:environment_id
     *
     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
     * @param environmentId the ID of the environment to delete
     * @throws GitLabApiException if any exception occurs
     */
    public void deleteEnvironment(Object projectIdOrPath, Integer environmentId) throws GitLabApiException {
	delete(Response.Status.OK, null,
                "projects", getProjectIdOrPath(projectIdOrPath), "environments", environmentId);
    }

    /**
     * Stop an environment.
     *
     * GitLab Endpoint:POST /projects/:id/environments/:environment_id/stop
     *
     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
     * @param environmentId the ID of the environment to stop
     * @return the Environment instance of the stopped environment
     * @throws GitLabApiException if any exception occurs
     */
    public Environment createEnvironment(Object projectIdOrPath, Integer environmentId) throws GitLabApiException {
	GitLabApiForm formData = new GitLabApiForm();
	Response response = post(Response.Status.CREATED, formData,
                "projects", getProjectIdOrPath(projectIdOrPath), "environments", environmentId, "stop");
	return (response.readEntity(Environment.class));
    }
}