Implemented label CRUD operations on GHRepository

Fixes issue #105

src/main/java/org/kohsuke/github/GHIssue.java

@@ -52,29 +52,17 @@ public class GHIssue extends GHObject {
     protected String closed_at;
     protected int comments;
     protected String body;
-    protected List<Label> labels;
+    protected List<GHLabel> labels;
     protected GHUser user;
     protected String title, html_url;
     protected GHIssue.PullRequest pull_request;
     protected GHMilestone milestone;
     protected GHUser closed_by;
 
-    public static class Label {
-        private String url;
-        private String name;
-        private String color;
-
-        public String getUrl() {
-			return url;
-		}
-
-        public String getName() {
-			return name;
-		}
-
-        public String getColor() {
-			return color;
-		}
+    /**
+     * @deprecated use {@link GHLabel}
+     */
+    public static class Label extends GHLabel {
     }
 
     /*package*/ GHIssue wrap(GHRepository owner) {
@@ -134,9 +122,9 @@ public GHIssueState getState() {
         return Enum.valueOf(GHIssueState.class, state.toUpperCase(Locale.ENGLISH));
     }
 
-    public Collection<Label> getLabels() throws IOException {
+    public Collection<GHLabel> getLabels() throws IOException {
         if(labels == null){
-            return Collections.EMPTY_LIST;
+            return Collections.emptyList();
         }
         return Collections.unmodifiableList(labels);
     }

src/main/java/org/kohsuke/github/GHLabel.java

@@ -0,0 +1,37 @@
+package org.kohsuke.github;
+
+import java.io.IOException;
+
+/**
+ * @author Kohsuke Kawaguchi
+ * @see GHIssue#getLabels()
+ * @see GHRepository#listLabels()
+ */
+public class GHLabel {
+    private String url, name, color;
+    private GHRepository repo;
+
+    public String getUrl() {
+        return url;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Color code without leading '#', such as 'f29513'
+     */
+    public String getColor() {
+        return color;
+    }
+
+    /*package*/ GHLabel wrapUp(GHRepository repo) {
+        this.repo = repo;
+        return this;
+    }
+
+    public void delete() throws IOException {
+        repo.root.retrieve().method("DELETE").to(url);
+    }
+}

src/main/java/org/kohsuke/github/GHPullRequest.java

@@ -127,7 +127,7 @@ public Date getMergedAt() {
     }
 
 	@Override
-	public Collection<Label> getLabels() throws IOException {
+	public Collection<GHLabel> getLabels() throws IOException {
         fetchIssue();
 		return super.getLabels();
 	}

src/main/java/org/kohsuke/github/GHRepository.java

@@ -760,6 +760,36 @@ protected void wrapUp(GHEventInfo[] page) {
         };
     }
 
+    /**
+     * Lists labels in this repository.
+     *
+     * https://developer.github.com/v3/issues/labels/#list-all-labels-for-this-repository
+     */
+    public PagedIterable<GHLabel> listLabels() throws IOException {
+        return new PagedIterable<GHLabel>() {
+            public PagedIterator<GHLabel> iterator() {
+                return new PagedIterator<GHLabel>(root.retrieve().asIterator(getApiTailUrl("labels"), GHLabel[].class)) {
+                    @Override
+                    protected void wrapUp(GHLabel[] page) {
+                        for (GHLabel c : page)
+                            c.wrapUp(GHRepository.this);
+                    }
+                };
+            }
+        };
+    }
+
+    public GHLabel getLabel(String name) throws IOException {
+        return root.retrieve().to(getApiTailUrl("labels/"+name), GHLabel.class).wrapUp(this);
+    }
+
+    public GHLabel createLabel(String name, String color) throws IOException {
+        return root.retrieve().method("POST")
+                .with("name",name)
+                .with("color",color)
+                .to(getApiTailUrl("labels"), GHLabel.class).wrapUp(this);
+    }
+
     /**
      * 
      * See https://api.github.com/hooks for possible names and their configuration scheme.

src/test/java/org/kohsuke/github/AppTest.java

@@ -12,6 +12,7 @@
 import java.net.URL;
 import java.util.*;
 import java.util.Map.Entry;
+import java.util.regex.Pattern;
 
 /**
  * Unit test for simple App.
@@ -665,6 +666,30 @@ public void testReadme() throws IOException {
         assertEquals(readme.getContent(),"This is a markdown readme.\n");
     }
 
+    @Test
+    public void testRepoLabel() throws IOException {
+        GHRepository r = gitHub.getRepository("github-api-test-org/test-labels");
+        List<GHLabel> lst = r.listLabels().asList();
+        for (GHLabel l : lst) {
+            System.out.println(l.getName());
+        }
+        assertTrue(lst.size() > 5);
+        GHLabel e = r.getLabel("enhancement");
+        assertEquals("enhancement",e.getName());
+        assertNotNull(e.getUrl());
+        assertTrue(Pattern.matches("[0-9a-fA-F]{6}",e.getColor()));
+
+        {// CRUD
+            GHLabel t = r.createLabel("test", "123456");
+            GHLabel t2 = r.getLabel("test");
+            assertEquals(t.getName(), t2.getName());
+            assertEquals(t.getColor(), "123456");
+            assertEquals(t.getColor(), t2.getColor());
+            assertEquals(t.getUrl(), t2.getUrl());
+            t.delete();
+        }
+    }
+
     private void kohsuke() {
         String login = getUser().getLogin();
         Assume.assumeTrue(login.equals("kohsuke") || login.equals("kohsuke2"));

src/test/java/org/kohsuke/github/PullRequestTest.java

@@ -24,7 +24,7 @@ public void setLabels() throws Exception {
         String label = rnd.next();
         p.setLabels(label);
 
-        Collection<GHIssue.Label> labels = getRepository().getPullRequest(p.getNumber()).getLabels();
+        Collection<GHLabel> labels = getRepository().getPullRequest(p.getNumber()).getLabels();
         assertEquals(1, labels.size());
         assertEquals(label, labels.iterator().next().getName());
     }