{"action":"created","comment":{"url":"https://api.github.com/repos/apache/incubator-beam/pulls/comments/61315869","id":61315869,"diff_hunk":"@@ -796,202 +609,133 @@ public Builder include(HasDisplayData subComponent, String namespace) {\n     }\n \n     @Override\n-    public ItemBuilder add(String key, String value) {\n-      checkNotNull(value);\n-      return addItemIf(true, key, Type.STRING, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder addIfNotNull(String key, @Nullable String value) {\n-      return addItemIf(value != null, key, Type.STRING, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder addIfNotDefault(\n-        String key, @Nullable String value, @Nullable String defaultValue) {\n-      return addItemIf(!Objects.equals(value, defaultValue), key, Type.STRING, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder add(String key, long value) {\n-      return addItemIf(true, key, Type.INTEGER, value);\n-    }\n-\n-    @Override\n-    public 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addIfNotDefault(Item<T> item, @Nullable T defaultValue) {\n+      checkNotNull(item, \"Input display item cannot be null\");\n+      Item<T> defaultItem = item.withValue(defaultValue);\n+      return addItemIf(!Objects.equals(item, defaultItem), item);\n     }\n \n-    @Override\n-    public ItemBuilder addIfNotDefault(String key, double value, double defaultValue) {\n-      return addItemIf(!Objects.equals(value, defaultValue), key, Type.FLOAT, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder add(String key, boolean value) {\n-      return addItemIf(true, key, Type.BOOLEAN, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder addIfNotNull(String key, @Nullable Boolean value) {\n-      return addItemIf(value != null, key, Type.BOOLEAN, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder addIfNotDefault(String key, boolean value, boolean defaultValue) {\n-      return addItemIf(!Objects.equals(value, defaultValue), key, Type.BOOLEAN, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder add(String key, Instant value) {\n-      return addItemIf(true, key, Type.TIMESTAMP, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder addIfNotNull(String key, @Nullable Instant value) {\n-      return addItemIf(value != null, key, Type.TIMESTAMP, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder addIfNotDefault(\n-        String key, @Nullable Instant value, @Nullable Instant defaultValue) {\n-      return addItemIf(!Objects.equals(value, defaultValue), key, Type.TIMESTAMP, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder add(String key, Duration value) {\n-      return addItemIf(true, key, Type.DURATION, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder addIfNotNull(String key, @Nullable Duration value) {\n-      return addItemIf(value != null, key, Type.DURATION, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder addIfNotDefault(\n-        String key, @Nullable Duration value, @Nullable Duration defaultValue) {\n-      return addItemIf(!Objects.equals(value, defaultValue), key, Type.DURATION, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder add(String key, Class<?> value) {\n-      return addItemIf(true, key, Type.JAVA_CLASS, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder add(String key, ClassForDisplay value) {\n-      checkNotNull(value);\n-      return addItemIf(true, key, Type.JAVA_CLASS, value);\n-    }\n-\n-    @Override\n-    public ItemBuilder addIfNotNull(String key, @Nullable Class<?> value) {\n-      return addItemIf(value != null, key, Type.JAVA_CLASS, value);\n-    }\n+    private Builder addItemIf(boolean condition, Item<?> item) {\n+      if (!condition) {\n+        return this;\n+      }\n \n-    @Override\n-    public ItemBuilder addIfNotNull(String key, @Nullable ClassForDisplay value) {\n-      return addItemIf(value != null, key, Type.JAVA_CLASS, value);\n-    }\n+      checkNotNull(item, \"Input display item cannot be null\");\n+      checkNotNull(item.getValue(), \"Input display value cannot be null\");\n+      if (item.getNamespace() == null) {\n+        item = item.withNamespace(latestNs);\n+      }\n \n-    @Override\n-    public ItemBuilder addIfNotDefault(\n-        String key, @Nullable Class<?> value, @Nullable Class<?> defaultValue) {\n-      return addItemIf(!Objects.equals(value, defaultValue), key, Type.JAVA_CLASS, value);\n-    }\n+      Identifier id = Identifier.of(item.getNamespace(), item.getKey());\n+      Preconditions.checkArgument(!entries.containsKey(id),\n+          \"Display data key (%s) is not unique within the specified namespace (%s).\",\n+          item.getKey(), item.getNamespace());\n \n-    @Override\n-    public ItemBuilder addIfNotDefault(\n-        String key, @Nullable ClassForDisplay value, @Nullable ClassForDisplay defaultValue) {\n-      return addItemIf(!Objects.equals(value, defaultValue), key, Type.JAVA_CLASS, value);\n+      entries.put(id, item);\n+      return this;\n     }\n \n-    @Override\n-    public ItemBuilder add(String key, Type type, Object value) {\n-      checkNotNull(type);\n-      return addItemIf(true, key, type, value);\n+    private DisplayData build() {\n+      return new DisplayData(this.entries);\n     }\n+  }\n \n-    private ItemBuilder addItemIf(boolean condition, String key, Type type, Object value) {\n-      checkNotNull(key, \"Display data keys cannot be null or empty.\");\n-      checkArgument(!key.isEmpty(), \"Display data keys cannot be null or empty.\");\n-      commitLatest();\n-\n-      if (condition) {\n-        checkNotNull(value, \"Display data values cannot be null. Key: [%s]\", key);\n-        latestItem = Item.create(latestNs, key, type, value);\n-      }\n-\n-      return this;\n-    }\n+  /**\n+   * Create a display item for the specified key and string value.\n+   */\n+  public static Item<String> item(String key, @Nullable String value) {\n+    return item(key, Type.STRING, value);\n+  }\n \n-    private void commitLatest() {\n-      if (latestItem == null) {\n-        return;\n-      }\n+  /**\n+   * Create a display item for the specified key and string value.\n+   */\n+  public static Item<Integer> item(String key, @Nullable Integer value) {\n+    return item(key, Type.INTEGER, value);\n+  }\n \n-      Identifier id = Identifier.of(latestItem.getNamespace(), latestItem.getKey());\n-      if (entries.containsKey(id)) {\n-        throw new IllegalArgumentException(\"DisplayData key already exists. All display data \"\n-          + \"for a component must be registered with a unique key.\\nKey: \" + id);\n-      }\n+  /**\n+   * Create a display item for the specified key and string value.\n+   */\n+  public static Item<Long> item(String key, @Nullable Long value) {\n+    return item(key, Type.INTEGER, value);\n+  }\n \n-      entries.put(id, latestItem);\n-      latestItem = null;\n-    }\n+  /**\n+   * Create a display item for the specified key and string value.","path":"sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/display/DisplayData.java","position":848,"original_position":848,"commit_id":"19665c89b6310dae23bb448f54befa8f14afbb60","original_commit_id":"19665c89b6310dae23bb448f54befa8f14afbb60","user":{"login":"bjchambers","id":35960,"avatar_url":"https://avatars.githubusercontent.com/u/35960?v=3","gravatar_id":"","url":"https://api.github.com/users/bjchambers","html_url":"https://github.com/bjchambers","followers_url":"https://api.github.com/users/bjchambers/followers","following_url":"https://api.github.com/users/bjchambers/following{/other_user}","gists_url":"https://api.github.com/users/bjchambers/gists{/gist_id}","starred_url":"https://api.github.com/users/bjchambers/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bjchambers/subscriptions","organizations_url":"https://api.github.com/users/bjchambers/orgs","repos_url":"https://api.github.com/users/bjchambers/repos","events_url":"https://api.github.com/users/bjchambers/events{/privacy}","received_events_url":"https://api.github.com/users/bjchambers/received_events","type":"User","site_admin":false},"body":"float\r\n\r\n(and ditto for the rest)","created_at":"2016-04-27T18:54:48Z","updated_at":"2016-04-27T18:54:48Z","html_url":"https://github.com/apache/incubator-beam/pull/247#discussion_r61315869","pull_request_url":"https://api.github.com/repos/apache/incubator-beam/pulls/247","_links":{"self":{"href":"https://api.github.com/repos/apache/incubator-beam/pulls/comments/61315869"},"html":{"href":"https://github.com/apache/incubator-beam/pull/247#discussion_r61315869"},"pull_request":{"href":"https://api.github.com/repos/apache/incubator-beam/pulls/247"}}},"pull_request":{"url":"https://api.github.com/repos/apache/incubator-beam/pulls/247","id":67974517,"html_url":"https://github.com/apache/incubator-beam/pull/247","diff_url":"https://github.com/apache/incubator-beam/pull/247.diff","patch_url":"https://github.com/apache/incubator-beam/pull/247.patch","issue_url":"https://api.github.com/repos/apache/incubator-beam/issues/247","number":247,"state":"open","locked":false,"title":"[BEAM-199] Update DisplayData APIs to make overrides more understandable","user":{"login":"swegner","id":674021,"avatar_url":"https://avatars.githubusercontent.com/u/674021?v=3","gravatar_id":"","url":"https://api.github.com/users/swegner","html_url":"https://github.com/swegner","followers_url":"https://api.github.com/users/swegner/followers","following_url":"https://api.github.com/users/swegner/following{/other_user}","gists_url":"https://api.github.com/users/swegner/gists{/gist_id}","starred_url":"https://api.github.com/users/swegner/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/swegner/subscriptions","organizations_url":"https://api.github.com/users/swegner/orgs","repos_url":"https://api.github.com/users/swegner/repos","events_url":"https://api.github.com/users/swegner/events{/privacy}","received_events_url":"https://api.github.com/users/swegner/received_events","type":"User","site_admin":false},"body":"Be sure to do all of the following to help us incorporate your contribution\r\nquickly and easily:\r\n\r\n - [ ] Make sure the PR title is formatted like:\r\n   `[BEAM-<Jira issue #>] Description of pull request`\r\n - [ ] Make sure tests pass via `mvn clean verify`. (Even better, enable\r\n       Travis-CI on your fork and ensure the whole test matrix passes).\r\n - [ ] Replace `<Jira issue #>` in the title with the actual Jira issue\r\n       number, if there is one.\r\n - [ ] If this contribution is large, please file an Apache\r\n       [Individual Contributor License Agreement](https://www.apache.org/licenses/icla.txt).\r\n\r\n---\r\n","created_at":"2016-04-26T23:27:30Z","updated_at":"2016-04-27T18:54:48Z","closed_at":null,"merged_at":null,"merge_commit_sha":"9445735aabd935f8ddd16c963e568f5432059468","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/incubator-beam/pulls/247/commits","review_comments_url":"https://api.github.com/repos/apache/incubator-beam/pulls/247/comments","review_comment_url":"https://api.github.com/repos/apache/incubator-beam/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/incubator-beam/issues/247/comments","statuses_url":"https://api.github.com/repos/apache/incubator-beam/statuses/19665c89b6310dae23bb448f54befa8f14afbb60","head":{"label":"swegner:displaydata-api","ref":"displaydata-api","sha":"19665c89b6310dae23bb448f54befa8f14afbb60","user":{"login":"swegner","id":674021,"avatar_url":"https://avatars.githubusercontent.com/u/674021?v=3","gravatar_id":"","url":"https://api.github.com/users/swegner","html_url":"https://github.com/swegner","followers_url":"https://api.github.com/users/swegner/followers","following_url":"https://api.github.com/users/swegner/following{/other_user}","gists_url":"https://api.github.com/users/swegner/gists{/gist_id}","starred_url":"https://api.github.com/users/swegner/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/swegner/subscriptions","organizations_url":"https://api.github.com/users/swegner/orgs","repos_url":"https://api.github.com/users/swegner/repos","events_url":"https://api.github.com/users/swegner/events{/privacy}","received_events_url":"https://api.github.com/users/swegner/received_events","type":"User","site_admin":false},"repo":{"id":52832170,"name":"incubator-beam","full_name":"swegner/incubator-beam","owner":{"login":"swegner","id":674021,"avatar_url":"https://avatars.githubusercontent.com/u/674021?v=3","gravatar_id":"","url":"https://api.github.com/users/swegner","html_url":"https://github.com/swegner","followers_url":"https://api.github.com/users/swegner/followers","following_url":"https://api.github.com/users/swegner/following{/other_user}","gists_url":"https://api.github.com/users/swegner/gists{/gist_id}","starred_url":"https://api.github.com/users/swegner/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/swegner/subscriptions","organizations_url":"https://api.github.com/users/swegner/orgs","repos_url":"https://api.github.com/users/swegner/repos","events_url":"https://api.github.com/users/swegner/events{/privacy}","received_events_url":"https://api.github.com/users/swegner/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/swegner/incubator-beam","description":"Mirror 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