Add api: Create, read, update and delete repository files.

src/main/java/com/messners/gitlab/api/RepositoryFileApi.java

+package com.messners.gitlab.api;
+
+import javax.ws.rs.core.Form;
+import javax.ws.rs.core.Response;
+
+import com.messners.gitlab.api.models.RepositoryFile;
+
+
+/**
+ * This class provides an entry point to all the GitLab API repository files calls.
+ * 
+ * @author lonfee88 <lonfee88@gmail.com>
+ */
+public class RepositoryFileApi extends AbstractApi {
+
+	public RepositoryFileApi (GitLabApi gitLabApi) {
+		super(gitLabApi);
+	}
+	
+    /**
+     * Get file from repository
+     * Allows you to receive information about file in repository like name, size, content.
+     * Note that file content is Base64 encoded. 
+     * 
+     * GET /projects/:id/repository/files
+     * 
+     * @param filePath
+     * @param projectId
+     * @param ref
+     * @return
+     * @throws GitLabApiException
+     */
+	public RepositoryFile getFile(String filePath, Integer projectId, String ref) throws GitLabApiException {   
+        Form form = new Form();
+        addFormParam(form, "file_path", filePath, true);
+        addFormParam(form, "ref", ref, true);
+        Response response = get(Response.Status.OK, form.asMap(),"projects", projectId, "repository", "files");
+        return (response.readEntity(RepositoryFile.class));
+    }
+	
+	/**
+	 * Create new file in repository
+	 * 
+	 * POST /projects/:id/repository/files
+	 * 
+	 * @param file
+	 * @param projectId
+	 * @param branchName
+	 * @param commitMessage
+	 * @return
+	 * @throws GitLabApiException
+	 */
+	public RepositoryFile createFile (RepositoryFile file, Integer projectId, String branchName,  String commitMessage) throws GitLabApiException {
+	    Form formData = file2form(file, branchName, commitMessage);
+        Response response = post(Response.Status.CREATED, formData, "projects", projectId, "repository", "files");
+        return (response.readEntity(RepositoryFile.class));
+    }
+	
+	/**
+	 * Update existing file in repository
+	 * 
+	 * PUT /projects/:id/repository/files
+	 * 
+	 * @param file
+	 * @param projectId
+	 * @param branchName
+	 * @param commitMessage
+	 * @return
+	 * @throws GitLabApiException
+	 */
+	public RepositoryFile updateFile (RepositoryFile file, Integer projectId, String branchName,  String commitMessage) throws GitLabApiException {
+	    Form form = file2form(file, branchName, commitMessage);     
+        Response response = put(Response.Status.OK, form.asMap(), "projects", projectId, "repository", "files");
+        return (response.readEntity(RepositoryFile.class));
+    }
+	
+	/**
+	 * Delete existing file in repository
+	 * 
+	 * DELETE /projects/:id/repository/files
+	 *
+	 * @param filePath
+	 * @param projectId
+	 * @param branchName
+	 * @param commitMessage
+	 * @throws GitLabApiException
+	 */
+	public void deleteFile (String filePath, Integer projectId, String branchName,  String commitMessage) throws GitLabApiException {
+        
+        if (filePath == null) {
+            throw new RuntimeException("filePath cannot be null");
+        }
+        
+        Form form = new Form();
+        addFormParam(form, "file_path", filePath, true);
+        addFormParam(form, "branch_name", branchName, true);
+        addFormParam(form, "commit_message", commitMessage, true);
+        delete(Response.Status.OK, form.asMap(), "projects", projectId, "repository", "files");
+    }
+	
+	private Form file2form(RepositoryFile file, String branchName, String commitMessage){
+	    Form form = new Form();
+	    addFormParam(form, "file_path", file.getFilePath(), true);
+	    addFormParam(form, "branch_name", branchName, true);
+	    addFormParam(form, "encoding", file.getEncoding(), false);
+	    addFormParam(form, "content", file.getContent(), true);
+	    addFormParam(form, "commit_message", commitMessage, true);
+	    return form;
+	}
+	
+}

src/main/java/com/messners/gitlab/api/models/RepositoryFile.java

+
+package com.messners.gitlab.api.models;
+
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlRootElement;
+
+@XmlRootElement
+@XmlAccessorType(XmlAccessType.FIELD)
+public class RepositoryFile {
+	
+    private String fileName; //file name only, Ex. lib/class.rb
+    private String filePath; //full path to  file. Ex. lib/class.rb
+    private Integer size;
+    private String encoding;
+    private String content;
+    private String ref;
+    private String blobId;
+    private String commitId;
+    
+    public String getFileName() {
+        return fileName;
+    }
+    
+    public void setFileName(String fileName) {
+        this.fileName = fileName;
+    }
+    
+    public String getFilePath() {
+        return filePath;
+    }
+    
+    public void setFilePath(String filePath) {
+        this.filePath = filePath;
+    }
+    
+    public Integer getSize() {
+        return size;
+    }
+    
+    public void setSize(Integer size) {
+        this.size = size;
+    }
+    
+    public String getEncoding() {
+        return encoding;
+    }
+    
+    public void setEncoding(String encoding) {
+        this.encoding = encoding;
+    }
+    
+    public String getContent() {
+        return content;
+    }
+    
+    public void setContent(String content) {
+        this.content = content;
+    }
+    
+    public String getRef() {
+        return ref;
+    }
+    
+    public void setRef(String ref) {
+        this.ref = ref;
+    }
+    
+    public String getBlobId() {
+        return blobId;
+    }
+    
+    public void setBlobId(String blobId) {
+        this.blobId = blobId;
+    }
+    
+    public String getCommitId() {
+        return commitId;
+    }
+    
+    public void setCommitId(String commitId) {
+        this.commitId = commitId;
+    }
+}