Added support for merge request pipeline API calls (#500)

src/main/java/org/gitlab4j/api/MergeRequestApi.java

@@ -19,6 +19,7 @@ import org.gitlab4j.api.models.MergeRequest;
 import org.gitlab4j.api.models.MergeRequestFilter;
 import org.gitlab4j.api.models.MergeRequestParams;
 import org.gitlab4j.api.models.Participant;
+import org.gitlab4j.api.models.Pipeline;
 
 /**
  * This class implements the client side API for the GitLab merge request calls.
@@ -1094,4 +1095,70 @@ public class MergeRequestApi extends AbstractApi {
 		"projects", getProjectIdOrPath(projectIdOrPath), "merge_requests", mergeRequestIid);
         return (response.readEntity(MergeRequest.class));
     }
+
+    /**
+     * Get a list of pipelines for a merge request.
+     *
+     * <pre><code>GitLab Endpoint: GET /projects/:id/merge_requests/:merge_request_iid/pipelines</code></pre>
+     *
+     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
+     * @param mergeRequestIid the internal ID of the merge request
+     * @return a list containing the pipelines for the specified merge request
+     * @throws GitLabApiException if any exception occurs during execution
+     */
+    public List<Pipeline> getMergeRequestPipelines(Object projectIdOrPath, Integer mergeRequestIid) throws GitLabApiException {
+        return (getMergeRequestPipelines(projectIdOrPath, mergeRequestIid, getDefaultPerPage()).all());
+    }
+
+    /**
+     * Get a Pager of pipelines for a merge request.
+     *
+     * <pre><code>GitLab Endpoint: GET /projects/:id/merge_requests/:merge_request_iid/pipelines</code></pre>
+     *
+     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
+     * @param mergeRequestIid the internal ID of the merge request
+     * @param itemsPerPage the number of Pipeline instances that will be fetched per page
+     * @return a Pager containing the pipelines for the specified merge request
+     * @throws GitLabApiException if any exception occurs during execution
+     */
+    public Pager<Pipeline> getMergeRequestPipelines(Object projectIdOrPath, Integer mergeRequestIid, int itemsPerPage) throws GitLabApiException {
+        return (new Pager<Pipeline>(this, Pipeline.class, itemsPerPage, null,
+                "projects", getProjectIdOrPath(projectIdOrPath), "merge_requests", mergeRequestIid, "pipelines"));
+    }
+
+    /**
+     * Get a Stream of pipelines for a merge request.
+     *
+    * <pre><code>GitLab Endpoint: GET /projects/:id/merge_requests/:merge_request_iid/pipelines</code></pre>
+     *
+     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
+     * @param mergeRequestIid the internal ID of the merge request
+     * @return a Stream containing the pipelines for the specified merge request
+     * @throws GitLabApiException if any exception occurs during execution
+     */
+    public Stream<Pipeline> getMergeRequestPipelinesStream(Object projectIdOrPath, Integer mergeRequestIid) throws GitLabApiException {
+        return (getMergeRequestPipelines(projectIdOrPath, mergeRequestIid, getDefaultPerPage()).stream());
+    }
+
+    /**
+     * <p>Create a new pipeline for a merge request. A pipeline created via this endpoint will not run
+     * a regular branch/tag pipeline, it requires .gitlab-ci.yml to be configured with only:
+     * [merge_requests] to create jobs.</p>
+     *
+     * The new pipeline can be:
+     *    A detached merge request pipeline.
+     *    A pipeline for merged results if the project setting is enabled.
+     *
+     * <pre><code>GitLab Endpoint: POST /projects/:id/merge_requests/:merge_request_iid/pipelines</code></pre>
+     *
+     * @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
+     * @param mergeRequestIid the internal ID of the merge request
+     * @return a Pipeline instance with the newly created pipeline info
+     * @throws GitLabApiException if any exception occurs during execution
+     */
+    public Pipeline createMergeRequestPipeline(Object projectIdOrPath, Integer mergeRequestIid) throws GitLabApiException {
+	Response response = post(Response.Status.CREATED, (Form)null,
+            "projects", getProjectIdOrPath(projectIdOrPath), "merge_requests", mergeRequestIid, "pipelines");
+        return (response.readEntity(Pipeline.class));
+    }
 }

src/main/java/org/gitlab4j/api/models/Pipeline.java

 package org.gitlab4j.api.models;
 
 import java.util.Date;
+import com.fasterxml.jackson.annotation.JsonIgnore;
 
 import org.gitlab4j.api.utils.JacksonJson;
 
@@ -15,10 +16,10 @@ public class Pipeline {
     private String yamlErrors;
     private User user;
     private Date createdAt;
-    private Date updated_at;
-    private Date started_at;
-    private Date finished_at;
-    private Date committed_at;
+    private Date updatedAt;
+    private Date startedAt;
+    private Date finishedAt;
+    private Date committedAt;
     private String coverage;
     private Integer duration;
     private String webUrl;
@@ -96,36 +97,116 @@ public class Pipeline {
         this.createdAt = createdAt;
     }
 
+    public Date getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(Date updated_at) {
+        this.updatedAt = updated_at;
+    }
+
+    public Date getStartedAt() {
+        return startedAt;
+    }
+
+    public void setStartedAt(Date started_at) {
+        this.startedAt = started_at;
+    }
+
+    public Date getFinishedAt() {
+        return finishedAt;
+    }
+
+    public void setFinishedAt(Date finished_at) {
+        this.finishedAt = finished_at;
+    }
+
+    public Date getCommittedAt() {
+        return committedAt;
+    }
+
+    public void setCommittedAt(Date committed_at) {
+        this.committedAt = committed_at;
+    }
+
+    /**
+     * @deprecated Replaced by {@link #getUpdatedAt()}
+     * @return the updated at Date
+     */
+    @Deprecated
+    @JsonIgnore
     public Date getUpdated_at() {
-        return updated_at;
+        return updatedAt;
     }
 
-    public void setUpdated_at(Date updated_at) {
-        this.updated_at = updated_at;
+    /**
+     * @deprecated Replaced by {@link #setUpdatedAt(Date)}
+     * @param updatedAt new updated at value
+     */
+    @Deprecated
+    @JsonIgnore
+    public void setUpdated_at(Date updatedAt) {
+        this.updatedAt = updatedAt;
     }
 
+    /**
+     * @deprecated Replaced by {@link #getStartedAt()}
+     * @return the started at Date
+     */
+    @Deprecated
+    @JsonIgnore
     public Date getStarted_at() {
-        return started_at;
+        return startedAt;
     }
 
-    public void setStarted_at(Date started_at) {
-        this.started_at = started_at;
+    /**
+     * @deprecated Replaced by {@link #setStartedAt(Date)}
+     * @param startedAt new started at value
+     */
+    @Deprecated
+    @JsonIgnore
+    public void setStarted_at(Date startedAt) {
+        this.startedAt = startedAt;
     }
 
+    /**
+     * @deprecated Replaced by {@link #getFinishedAt()}
+     * @return the finished at Date
+     */
+    @Deprecated
+    @JsonIgnore
     public Date getFinished_at() {
-        return finished_at;
+        return finishedAt;
     }
 
-    public void setFinished_at(Date finished_at) {
-        this.finished_at = finished_at;
+    /**
+     * @deprecated Replaced by {@link #setFinishedAt(Date)}
+     * @param finishedAt new finished at value
+     */
+    @Deprecated
+    @JsonIgnore
+    public void setFinished_at(Date finishedAt) {
+        this.finishedAt = finishedAt;
     }
 
+    /**
+     * @deprecated Replaced by {@link #getCommittedAt()}
+     * @return the committed at Date
+     */
+    @Deprecated
+    @JsonIgnore
     public Date getCommitted_at() {
-        return committed_at;
+        return committedAt;
     }
 
-    public void setCommitted_at(Date committed_at) {
-        this.committed_at = committed_at;
+    /**
+     * @deprecated Replaced by {@link #setCommittedAt(Date)}
+     * @param committedAt new committed at value
+     */
+    @Deprecated
+    @JsonIgnore
+    public void setCommitted_at(Date committedAt) {
+        this.committedAt = committedAt;
     }
 
     public String getCoverage() {