Add deleteIssue method.

@@ -11,6 +11,7 @@ import org.apache.http.client.ClientProtocolException;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.HttpResponseException;
 import org.apache.http.client.entity.UrlEncodedFormEntity;
+import org.apache.http.client.methods.HttpDelete;
 import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpPost;
@@ -62,343 +63,354 @@ import java.util.regex.Pattern;
 public class YoutrackAPI {
 // ------------------------------ FIELDS ------------------------------
 
-    private final static QName Enumeration_QNAME = new QName("", "enumeration");
+  private final static QName Enumeration_QNAME = new QName("", "enumeration");
 
-    private final static QName Issue_QNAME = new QName("", "issue");
+  private final static QName Issue_QNAME = new QName("", "issue");
 
-    private HttpClient httpClient;
+  private HttpClient httpClient;
 
-    private String serviceLocation;
+  private String serviceLocation;
 
 // -------------------------- STATIC METHODS --------------------------
 
-    private static HttpClient getDefaultHttpClient()
-    {
-        SSLContext sslContext;
-        try {
-            sslContext = SSLContext.getInstance("SSL");
-        } catch (NoSuchAlgorithmException e) {
-            throw new RuntimeException(e);
-        }
-        // set up a TrustManager that trusts everything
-        try {
-            sslContext.init(null, new TrustManager[]{new X509TrustManager() {
-                public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException
-                {
-                }
-
-                public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException
-                {
-                }
-
-                public X509Certificate[] getAcceptedIssuers()
-                {
-                    return new X509Certificate[0];
-                }
-            }}, new SecureRandom());
-        } catch (KeyManagementException e) {
-            throw new RuntimeException(e);
+  private static HttpClient getDefaultHttpClient()
+  {
+    SSLContext sslContext;
+    try {
+      sslContext = SSLContext.getInstance("SSL");
+    } catch (NoSuchAlgorithmException e) {
+      throw new RuntimeException(e);
+    }
+    // set up a TrustManager that trusts everything
+    try {
+      sslContext.init(null, new TrustManager[]{new X509TrustManager() {
+        public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException
+        {
         }
 
-        SSLSocketFactory sf = new SSLSocketFactory(sslContext);
-        Scheme httpsScheme = new Scheme("https", 443, sf);
-        SchemeRegistry schemeRegistry = SchemeRegistryFactory.createDefault();
-        schemeRegistry.register(schemeRegistry.unregister("https"));
-        schemeRegistry.register(httpsScheme);
+        public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException
+        {
+        }
 
-        ClientConnectionManager cm = new PoolingClientConnectionManager(schemeRegistry);
-        return new DefaultHttpClient(cm);
+        public X509Certificate[] getAcceptedIssuers()
+        {
+          return new X509Certificate[0];
+        }
+      }}, new SecureRandom());
+    } catch (KeyManagementException e) {
+      throw new RuntimeException(e);
     }
 
-    private static boolean isBlank(String str)
-    {
-        int strLen;
-        if (str == null || (strLen = str.length()) == 0) {
-            return true;
-        }
-        for (int i = 0; i < strLen; i++) {
-            if ((!Character.isWhitespace(str.charAt(i)))) {
-                return false;
-            }
-        }
-        return true;
+    SSLSocketFactory sf = new SSLSocketFactory(sslContext);
+    Scheme httpsScheme = new Scheme("https", 443, sf);
+    SchemeRegistry schemeRegistry = SchemeRegistryFactory.createDefault();
+    schemeRegistry.register(schemeRegistry.unregister("https"));
+    schemeRegistry.register(httpsScheme);
+
+    ClientConnectionManager cm = new PoolingClientConnectionManager(schemeRegistry);
+    return new DefaultHttpClient(cm);
+  }
+
+  private static boolean isBlank(String str)
+  {
+    int strLen;
+    if (str == null || (strLen = str.length()) == 0) {
+      return true;
+    }
+    for (int i = 0; i < strLen; i++) {
+      if ((!Character.isWhitespace(str.charAt(i)))) {
+        return false;
+      }
     }
+    return true;
+  }
 
 // --------------------------- CONSTRUCTORS ---------------------------
 
-    public YoutrackAPI(String serviceLocation)
-    {
-        this(serviceLocation, null);
-    }
+  public YoutrackAPI(String serviceLocation)
+  {
+    this(serviceLocation, null);
+  }
 
-    public YoutrackAPI(String serviceLocation, HttpClient httpClient)
-    {
-        this.serviceLocation = serviceLocation;
-        this.httpClient = httpClient == null ? getDefaultHttpClient() : httpClient;
-    }
+  public YoutrackAPI(String serviceLocation, HttpClient httpClient)
+  {
+    this.serviceLocation = serviceLocation;
+    this.httpClient = httpClient == null ? getDefaultHttpClient() : httpClient;
+  }
 
-    public YoutrackAPI(String serviceLocation, String username, String password) throws IOException, JAXBException
-    {
-        this(serviceLocation, null, username, password);
-    }
+  public YoutrackAPI(String serviceLocation, String username, String password) throws IOException, JAXBException
+  {
+    this(serviceLocation, null, username, password);
+  }
 
-    public YoutrackAPI(String serviceLocation, HttpClient httpClient, String username, String password) throws IOException, JAXBException
-    {
-        this(serviceLocation, httpClient);
-        login(username, password);
-    }
+  public YoutrackAPI(String serviceLocation, HttpClient httpClient, String username, String password) throws IOException, JAXBException
+  {
+    this(serviceLocation, httpClient);
+    login(username, password);
+  }
 
 // --------------------- GETTER / SETTER METHODS ---------------------
 
-    public String getServiceLocation()
-    {
-        return serviceLocation;
-    }
+  public String getServiceLocation()
+  {
+    return serviceLocation;
+  }
 
 // -------------------------- OTHER METHODS --------------------------
 
-    public void command(String issueId, String command) throws IOException
-    {
-        command(issueId, command, null, null, null, null);
+  public void command(String issueId, String command) throws IOException
+  {
+    command(issueId, command, null, null, null, null);
+  }
+
+  public void command(String issueId, Command command) throws IOException
+  {
+    command(issueId, command.toString());
+  }
+
+  public void command(String issueId, String command, String comment, String group, Boolean disableNotifications, String runAs) throws IOException
+  {
+    final HttpPost request = new HttpPost(serviceLocation + "/rest/issue/" + issueId + "/execute");
+    final List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();
+    parameters.add(new BasicNameValuePair("command", command));
+    if (!isBlank(comment)) {
+      parameters.add(new BasicNameValuePair("comment", comment));
     }
-
-    public void command(String issueId, Command command) throws IOException
-    {
-        command(issueId, command.toString());
+    if (!isBlank(group)) {
+      parameters.add(new BasicNameValuePair("group", group));
     }
-
-    public void command(String issueId, String command, String comment, String group, Boolean disableNotifications, String runAs) throws IOException
-    {
-        final HttpPost request = new HttpPost(serviceLocation + "/rest/issue/" + issueId + "/execute");
-        final List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();
-        parameters.add(new BasicNameValuePair("command", command));
-        if (!isBlank(comment)) {
-            parameters.add(new BasicNameValuePair("comment", comment));
-        }
-        if (!isBlank(group)) {
-            parameters.add(new BasicNameValuePair("group", group));
-        }
-        if (disableNotifications != null) {
-            parameters.add(new BasicNameValuePair("disableNotifications", disableNotifications.toString()));
-        }
-        if (!isBlank(runAs)) {
-            parameters.add(new BasicNameValuePair("runAs", runAs));
-        }
-        request.setEntity(new UrlEncodedFormEntity(parameters));
-        execute(request);
+    if (disableNotifications != null) {
+      parameters.add(new BasicNameValuePair("disableNotifications", disableNotifications.toString()));
     }
-
-    /**
-     * Creates new issue on Youtrack.
-     *
-     * @param project     project to create issue in
-     * @param summary     summary of the issue
-     * @param description longer description of the issue
-     *
-     * @return issue id of created issue
-     *
-     * @throws IOException in case of communication problems
-     */
-    public String createIssue(String project, String summary, String description) throws IOException
-    {
-        final URI uri;
-        try {
-            uri = new URIBuilder(serviceLocation + "/rest/issue").build();
-        } catch (URISyntaxException e) {
-            throw new RuntimeException(e);
-        }
-        final HttpPut request = createPutRequest(uri, new BasicNameValuePair("project", project), new BasicNameValuePair("summary", summary),
-            new BasicNameValuePair("description", description));
-        final HttpResponse response = httpClient.execute(request);
-        final StatusLine statusLine = response.getStatusLine();
-        final HttpEntity entity = response.getEntity();
-        final String responseText = entity == null ? null : EntityUtils.toString(entity);
-        throwExceptionsIfNeeded(statusLine, responseText);
-
-        final Header header = response.getFirstHeader(HttpHeaders.LOCATION);
-        if (header == null) {
-            throw new YoutrackAPIException("Missing location header despite positive status code: " + statusLine.getStatusCode());
-        }
-        final String issueURL = header.getValue();
-        final Matcher matcher = Pattern.compile(".*(" + project + "-\\d+)").matcher(issueURL);
-        if (!matcher.find() || matcher.groupCount() < 1) {
-            throw new YoutrackAPIException("Cannot extract issue id from issue URL: " + issueURL);
-        }
-        return matcher.group(1);
+    if (!isBlank(runAs)) {
+      parameters.add(new BasicNameValuePair("runAs", runAs));
     }
-
-    public AssigneeList getAssignees(String project) throws IOException, JAXBException
-    {
-        final URI uri;
-        try {
-            uri = new URIBuilder(serviceLocation + "/rest/admin/project/" + project + "/assignee").build();
-        } catch (URISyntaxException e) {
-            throw new RuntimeException(e);
-        }
-        final String responseString = execute(new HttpGet(uri));
-        final Object result = YoutrackUnmarshaller.unmarshall(responseString);
-        if (result instanceof AssigneeList) {
-            return (AssigneeList) result;
-        } else {
-            throw new YoutrackAPIException("Unexpected type: " + result);
-        }
+    request.setEntity(new UrlEncodedFormEntity(parameters));
+    execute(request);
+  }
+
+  /**
+   * Creates new issue on Youtrack.
+   *
+   * @param project     project to create issue in
+   * @param summary     summary of the issue
+   * @param description longer description of the issue
+   *
+   * @return issue id of created issue
+   *
+   * @throws IOException in case of communication problems
+   */
+  public String createIssue(String project, String summary, String description) throws IOException
+  {
+    final URI uri;
+    try {
+      uri = new URIBuilder(serviceLocation + "/rest/issue").build();
+    } catch (URISyntaxException e) {
+      throw new RuntimeException(e);
     }
-
-    public Enumeration getBundle(String customField) throws IOException, JAXBException
-    {
-        final URI uri;
-        try {
-            uri = new URIBuilder(serviceLocation + "/rest/admin/customfield/bundle/" + customField).build();
-        } catch (URISyntaxException e) {
-            throw new RuntimeException(e);
-        }
-        final Object result = YoutrackUnmarshaller.unmarshall(execute(new HttpGet(uri)));
-        if (result instanceof Enumeration) {
-            return (Enumeration) result;
-        } else if (result instanceof JAXBElement) {
-            final JAXBElement jaxbElement = (JAXBElement) result;
-            if (Enumeration_QNAME.equals(jaxbElement.getName())) {
-                return (Enumeration) ((JAXBElement) result).getValue();
-            } else {
-                throw new YoutrackAPIException("Unexpected type: " + jaxbElement.getValue());
-            }
-        } else {
-            throw new YoutrackAPIException("Unexpected type: " + result);
-        }
+    final HttpPut request = createPutRequest(uri, new BasicNameValuePair("project", project), new BasicNameValuePair("summary", summary),
+        new BasicNameValuePair("description", description));
+    final HttpResponse response = httpClient.execute(request);
+    final StatusLine statusLine = response.getStatusLine();
+    final HttpEntity entity = response.getEntity();
+    final String responseText = entity == null ? null : EntityUtils.toString(entity);
+    throwExceptionsIfNeeded(statusLine, responseText);
+
+    final Header header = response.getFirstHeader(HttpHeaders.LOCATION);
+    if (header == null) {
+      throw new YoutrackAPIException("Missing location header despite positive status code: " + statusLine.getStatusCode());
     }
-
-    public List<User> getIndividualAssignees(String project) throws IOException, JAXBException
-    {
-        final URI uri;
-        try {
-            uri = new URIBuilder(serviceLocation + "/rest/admin/project/" + project + "/assignee/individual").build();
-        } catch (URISyntaxException e) {
-            throw new RuntimeException(e);
-        }
-        final String responseString = execute(new HttpGet(uri));
-        final Object result = YoutrackUnmarshaller.unmarshall(responseString);
-        if (result instanceof UserRefs) {
-            return ((UserRefs) result).getUsers();
-        } else {
-            throw new YoutrackAPIException("Unexpected type: " + result);
-        }
+    final String issueURL = header.getValue();
+    final Matcher matcher = Pattern.compile(".*(" + project + "-\\d+)").matcher(issueURL);
+    if (!matcher.find() || matcher.groupCount() < 1) {
+      throw new YoutrackAPIException("Cannot extract issue id from issue URL: " + issueURL);
     }
-
-    public IssueWrapper getIssue(String issueId) throws IOException, JAXBException
-    {
-        final URI uri;
-        try {
-            uri = new URIBuilder(serviceLocation + "/rest/issue/" + issueId).build();
-        } catch (URISyntaxException e) {
-            throw new RuntimeException(e);
-        }
-        final String responseString;
-        try {
-            responseString = execute(new HttpGet(uri));
-        } catch (YoutrackErrorException e) {
-            if (e.getStatusCode() == HttpStatus.SC_NOT_FOUND) {
-                throw new NoResultFoundException(e.getMessage(), e);
-            } else {
-                throw e;
-            }
-        }
-        final Object result = YoutrackUnmarshaller.unmarshall(responseString);
-        if (result instanceof pl.com.it_crowd.youtrack.api.rest.Issue) {
-            return new IssueWrapper((Issue) result);
-        } else if (result instanceof JAXBElement) {
-            final JAXBElement jaxbElement = (JAXBElement) result;
-            if (Issue_QNAME.equals(jaxbElement.getName())) {
-                return new IssueWrapper((Issue) jaxbElement.getValue());
-            } else {
-                throw new YoutrackAPIException("Unexpected type: " + jaxbElement.getValue());
-            }
-        } else {
-            throw new YoutrackAPIException("Unexpected type " + result);
-        }
+    return matcher.group(1);
+  }
+
+  public void deleteIssue(String issueId) throws IOException
+  {
+    final URI uri;
+    try {
+      uri = new URIBuilder(serviceLocation + "/rest/issue/" + issueId).build();
+    } catch (URISyntaxException e) {
+      throw new RuntimeException(e);
     }
-
-    public void login(String username, String password) throws IOException, JAXBException
-    {
-        final HttpPost request = new HttpPost(serviceLocation + "/rest/user/login");
-        request.setEntity(new UrlEncodedFormEntity(Arrays.asList(new BasicNameValuePair("login", username), new BasicNameValuePair("password", password))));
-        execute(request);
+    execute(new HttpDelete(uri));
+  }
+
+  public AssigneeList getAssignees(String project) throws IOException, JAXBException
+  {
+    final URI uri;
+    try {
+      uri = new URIBuilder(serviceLocation + "/rest/admin/project/" + project + "/assignee").build();
+    } catch (URISyntaxException e) {
+      throw new RuntimeException(e);
     }
-
-    public List<IssueWrapper> searchIssuesByProject(String project, Object filter) throws JAXBException, IOException
-    {
-        final String url = serviceLocation + "/rest/issue/byproject/" + project + "?filter=" + (filter == null ? "" : filter);
-        final Object result = YoutrackUnmarshaller.unmarshall(execute(new HttpGet(url)));
-        if (!(result instanceof Issues)) {
-            throw new YoutrackAPIException("Unmarshalling problem. Expected Issues, received: " + result.getClass() + " " + result);
-        }
-        List<Issue> issues = ((Issues) result).getIssues();
-        List<IssueWrapper> wrappedIssues = new ArrayList<IssueWrapper>();
-        for (Issue issue : issues) {
-            wrappedIssues.add(new IssueWrapper(issue));
-        }
-        return wrappedIssues;
+    final String responseString = execute(new HttpGet(uri));
+    final Object result = YoutrackUnmarshaller.unmarshall(responseString);
+    if (result instanceof AssigneeList) {
+      return (AssigneeList) result;
+    } else {
+      throw new YoutrackAPIException("Unexpected type: " + result);
     }
-
-    public void updateIssue(String issueId, String summary, String description) throws IOException
-    {
-        final URI uri;
-        try {
-            uri = new URIBuilder(serviceLocation + "/rest/issue/" + issueId).build();
-        } catch (URISyntaxException e) {
-            throw new RuntimeException(e);
-        }
-        final HttpPost request = createPostRequest(uri, new BasicNameValuePair(Fields.summary.name(), summary),
-            new BasicNameValuePair(Fields.description.name(), description));
-        final HttpResponse response = httpClient.execute(request);
-        final StatusLine statusLine = response.getStatusLine();
-        final HttpEntity entity = response.getEntity();
-        final String responseText = entity == null ? null : EntityUtils.toString(entity);
-        throwExceptionsIfNeeded(statusLine, responseText);
+  }
+
+  public Enumeration getBundle(String customField) throws IOException, JAXBException
+  {
+    final URI uri;
+    try {
+      uri = new URIBuilder(serviceLocation + "/rest/admin/customfield/bundle/" + customField).build();
+    } catch (URISyntaxException e) {
+      throw new RuntimeException(e);
     }
-
-    private HttpPost createPostRequest(URI uri, NameValuePair... nameValuePair) throws UnsupportedEncodingException
-    {
-        return setEntity(new HttpPost(uri), nameValuePair);
+    final Object result = YoutrackUnmarshaller.unmarshall(execute(new HttpGet(uri)));
+    if (result instanceof Enumeration) {
+      return (Enumeration) result;
+    } else if (result instanceof JAXBElement) {
+      final JAXBElement jaxbElement = (JAXBElement) result;
+      if (Enumeration_QNAME.equals(jaxbElement.getName())) {
+        return (Enumeration) ((JAXBElement) result).getValue();
+      } else {
+        throw new YoutrackAPIException("Unexpected type: " + jaxbElement.getValue());
+      }
+    } else {
+      throw new YoutrackAPIException("Unexpected type: " + result);
     }
-
-    private HttpPut createPutRequest(URI uri, NameValuePair... nameValuePair) throws UnsupportedEncodingException
-    {
-        return setEntity(new HttpPut(uri), nameValuePair);
+  }
+
+  public List<User> getIndividualAssignees(String project) throws IOException, JAXBException
+  {
+    final URI uri;
+    try {
+      uri = new URIBuilder(serviceLocation + "/rest/admin/project/" + project + "/assignee/individual").build();
+    } catch (URISyntaxException e) {
+      throw new RuntimeException(e);
     }
-
-    private String execute(HttpUriRequest request) throws IOException
-    {
-        final HttpResponse response = httpClient.execute(request);
-        final StatusLine statusLine = response.getStatusLine();
-        final HttpEntity entity = response.getEntity();
-        String responseText = entity == null ? null : EntityUtils.toString(entity);
-        if (statusLine.getStatusCode() >= 300) {
-            try {
-                final String error = ErrorUnmarshaller.unmarshal(responseText);
-                throw new YoutrackErrorException(error, statusLine.getStatusCode());
-            } catch (JAXBException e) {
-                //                    TODO we should log on debug level the JAXBException
-                throw new HttpResponseException(statusLine.getStatusCode(), responseText);
-            }
-        }
-        if (entity == null) {
-            throw new ClientProtocolException("Response contains no content");
-        }
-        return responseText;
+    final String responseString = execute(new HttpGet(uri));
+    final Object result = YoutrackUnmarshaller.unmarshall(responseString);
+    if (result instanceof UserRefs) {
+      return ((UserRefs) result).getUsers();
+    } else {
+      throw new YoutrackAPIException("Unexpected type: " + result);
     }
-
-    private <T extends HttpEntityEnclosingRequestBase> T setEntity(T request, NameValuePair[] nameValuePair) throws UnsupportedEncodingException
-    {
-        final ArrayList<NameValuePair> list = new ArrayList<NameValuePair>();
-        Collections.addAll(list, nameValuePair);
-        request.setEntity(new UrlEncodedFormEntity(list));
-        return request;
+  }
+
+  public IssueWrapper getIssue(String issueId) throws IOException, JAXBException
+  {
+    final URI uri;
+    try {
+      uri = new URIBuilder(serviceLocation + "/rest/issue/" + issueId).build();
+    } catch (URISyntaxException e) {
+      throw new RuntimeException(e);
     }
-
-    private void throwExceptionsIfNeeded(StatusLine statusLine, String responseText) throws IOException
-    {
-        if (statusLine.getStatusCode() >= 300) {
-            throw new HttpResponseException(statusLine.getStatusCode(), responseText);
-        }
+    final String responseString;
+    try {
+      responseString = execute(new HttpGet(uri));
+    } catch (YoutrackErrorException e) {
+      if (e.getStatusCode() == HttpStatus.SC_NOT_FOUND) {
+        throw new NoResultFoundException(e.getMessage(), e);
+      } else {
+        throw e;
+      }
+    }
+    final Object result = YoutrackUnmarshaller.unmarshall(responseString);
+    if (result instanceof pl.com.it_crowd.youtrack.api.rest.Issue) {
+      return new IssueWrapper((Issue) result);
+    } else if (result instanceof JAXBElement) {
+      final JAXBElement jaxbElement = (JAXBElement) result;
+      if (Issue_QNAME.equals(jaxbElement.getName())) {
+        return new IssueWrapper((Issue) jaxbElement.getValue());
+      } else {
+        throw new YoutrackAPIException("Unexpected type: " + jaxbElement.getValue());
+      }
+    } else {
+      throw new YoutrackAPIException("Unexpected type " + result);
+    }
+  }
+
+  public void login(String username, String password) throws IOException, JAXBException
+  {
+    final HttpPost request = new HttpPost(serviceLocation + "/rest/user/login");
+    request.setEntity(new UrlEncodedFormEntity(Arrays.asList(new BasicNameValuePair("login", username), new BasicNameValuePair("password", password))));
+    execute(request);
+  }
+
+  public List<IssueWrapper> searchIssuesByProject(String project, Object filter) throws JAXBException, IOException
+  {
+    final String url = serviceLocation + "/rest/issue/byproject/" + project + "?filter=" + (filter == null ? "" : filter);
+    final Object result = YoutrackUnmarshaller.unmarshall(execute(new HttpGet(url)));
+    if (!(result instanceof Issues)) {
+      throw new YoutrackAPIException("Unmarshalling problem. Expected Issues, received: " + result.getClass() + " " + result);
+    }
+    List<Issue> issues = ((Issues) result).getIssues();
+    List<IssueWrapper> wrappedIssues = new ArrayList<IssueWrapper>();
+    for (Issue issue : issues) {
+      wrappedIssues.add(new IssueWrapper(issue));
+    }
+    return wrappedIssues;
+  }
+
+  public void updateIssue(String issueId, String summary, String description) throws IOException
+  {
+    final URI uri;
+    try {
+      uri = new URIBuilder(serviceLocation + "/rest/issue/" + issueId).build();
+    } catch (URISyntaxException e) {
+      throw new RuntimeException(e);
+    }
+    final HttpPost request = createPostRequest(uri, new BasicNameValuePair(Fields.summary.name(), summary),
+        new BasicNameValuePair(Fields.description.name(), description));
+    final HttpResponse response = httpClient.execute(request);
+    final StatusLine statusLine = response.getStatusLine();
+    final HttpEntity entity = response.getEntity();
+    final String responseText = entity == null ? null : EntityUtils.toString(entity);
+    throwExceptionsIfNeeded(statusLine, responseText);
+  }
+
+  private HttpPost createPostRequest(URI uri, NameValuePair... nameValuePair) throws UnsupportedEncodingException
+  {
+    return setEntity(new HttpPost(uri), nameValuePair);
+  }
+
+  private HttpPut createPutRequest(URI uri, NameValuePair... nameValuePair) throws UnsupportedEncodingException
+  {
+    return setEntity(new HttpPut(uri), nameValuePair);
+  }
+
+  private String execute(HttpUriRequest request) throws IOException
+  {
+    final HttpResponse response = httpClient.execute(request);
+    final StatusLine statusLine = response.getStatusLine();
+    final HttpEntity entity = response.getEntity();
+    String responseText = entity == null ? null : EntityUtils.toString(entity);
+    if (statusLine.getStatusCode() >= 300) {
+      try {
+        final String error = ErrorUnmarshaller.unmarshal(responseText);
+        throw new YoutrackErrorException(error, statusLine.getStatusCode());
+      } catch (JAXBException e) {
+        //                    TODO we should log on debug level the JAXBException
+        throw new HttpResponseException(statusLine.getStatusCode(), responseText);
+      }
+    }
+    if (entity == null) {
+      throw new ClientProtocolException("Response contains no content");
+    }
+    return responseText;
+  }
+
+  private <T extends HttpEntityEnclosingRequestBase> T setEntity(T request, NameValuePair[] nameValuePair) throws UnsupportedEncodingException
+  {
+    final ArrayList<NameValuePair> list = new ArrayList<NameValuePair>();
+    Collections.addAll(list, nameValuePair);
+    request.setEntity(new UrlEncodedFormEntity(list));
+    return request;
+  }
+
+  private void throwExceptionsIfNeeded(StatusLine statusLine, String responseText) throws IOException
+  {
+    if (statusLine.getStatusCode() >= 300) {
+      throw new HttpResponseException(statusLine.getStatusCode(), responseText);
     }
+  }
 }
\ No newline at end of file