private boolean inputSet()

in org.eclipse.egit.ui/src/org/eclipse/egit/ui/internal/history/GitHistoryPage.java [1988:2154]
157 lines of code
35 McCabe index (conditional complexity)

	private boolean inputSet(RevCommit prevSelection) {
		try {
			if (trace)
				GitTraceLocation.getTrace().traceEntry(
						GitTraceLocation.HISTORYVIEW.getLocation());
			if (this.input != null)
				return true;

			Object o = super.getInput();
			if (o == null) {
				setErrorMessage(UIText.GitHistoryPage_NoInputMessage);
				return false;
			}

			boolean showHead = false;
			boolean showRef = false;
			boolean showTag = false;
			Repository repo = null;
			RevCommit selection = null;
			Ref ref = null;
			if (o instanceof IResource) {
				RepositoryMapping mapping = RepositoryMapping
						.getMapping((IResource) o);
				if (mapping != null) {
					repo = mapping.getRepository();
					input = new HistoryPageInput(repo,
							new IResource[] { (IResource) o });
					showHead = true;
				}
			} else if (o instanceof RepositoryTreeNode) {
				RepositoryTreeNode repoNode = (RepositoryTreeNode) o;
				repo = repoNode.getRepository();
				switch (repoNode.getType()) {
				case FILE:
					File file = ((FileNode) repoNode).getObject();
					input = new HistoryPageInput(repo, new File[] { file });
					showHead = true;
					break;
				case FOLDER:
					File folder = ((FolderNode) repoNode).getObject();
					input = new HistoryPageInput(repo, new File[] { folder });
					showHead = true;
					break;
				case REF:
					input = new HistoryPageInput(repo);
					ref = ((RefNode) repoNode).getObject();
					showRef = true;
					break;
				case ADDITIONALREF:
					input = new HistoryPageInput(repo);
					ref = ((AdditionalRefNode) repoNode).getObject();
					if (ref.getObjectId() == null) {
						ref = null;
					}
					showRef = ref != null;
					break;
				case TAG:
					input = new HistoryPageInput(repo);
					ref = ((TagNode) repoNode).getObject();
					showTag = true;
					break;
				default:
					input = new HistoryPageInput(repo);
					showHead = true;
					break;
				}
			} else if (o instanceof HistoryPageInput) {
				input = (HistoryPageInput) o;
				repo = input.getRepository();
			} else if (o instanceof Path) {
				Path path = (Path) o;
				repo = ResourceUtil.getRepository(path);
				if (repo != null) {
					input = new HistoryPageInput(repo,
							new File[] { path.toFile() });
				}
			} else {
				IResource resource = AdapterUtils.adaptToAnyResource(o);
				if (resource != null) {
					RepositoryMapping mapping = RepositoryMapping
							.getMapping(resource);
					if (mapping != null) {
						repo = mapping.getRepository();
						input = new HistoryPageInput(repo,
								new IResource[] { resource });
					}
				}
			}
			if (repo == null) {
				GitInfo info = Adapters.adapt(o, GitInfo.class);
				if (info != null && info.getRepository() != null) {
					repo = info.getRepository();
					IPath gitPath = Path.fromPortableString(info.getGitPath());
					input = new HistoryPageInput(repo,
							new File[] { new File(gitPath.toOSString()) });
				} else {
					repo = Adapters.adapt(o, Repository.class);
					if (repo != null) {
						File file = Adapters.adapt(o, File.class);
						if (file == null) {
							input = new HistoryPageInput(repo);
						} else {
							input = new HistoryPageInput(repo,
									new File[] { file });
						}
					}
				}
			}
			selection = Adapters.adapt(o, RevCommit.class);

			if (input == null || repo == null) {
				this.name = ""; //$NON-NLS-1$
				setErrorMessage(UIText.GitHistoryPage_NoInputMessage);
				return false;
			}

			final IResource[] inResources = input.getItems();
			final File[] inFiles = input.getFileList();

			this.name = calculateName(input);

			// disable the filters if we have a Repository as input
			boolean filtersActive = inResources != null || inFiles != null;
			actions.showAllRepoVersionsAction.setEnabled(filtersActive);
			// the repository itself has no notion of projects
			actions.showAllProjectVersionsAction
					.setEnabled(inResources != null);
			actions.showAllFolderVersionsAction.setEnabled(filtersActive);
			actions.showAllResourceVersionsAction.setEnabled(filtersActive);

			setErrorMessage(null);
			try {
				ObjectId id = null;
				if (ref != null) {
					id = ref.getLeaf().getObjectId();
				} else if (selection != null) {
					id = selection.getId();
				}
				initAndStartRevWalk(false, id);
			} catch (IllegalStateException e) {
				Activator.handleError(e.getMessage(), e, true);
				return false;
			}

			if (prevSelection != null) {
				graph.selectCommitStored(prevSelection);
			} else {
				if (showHead) {
					showHead(repo);
				}
				if (showRef) {
					showRef(ref, repo);
				}
				if (showTag) {
					showTag(ref, repo);
				}
				if (selection != null) {
					graph.selectCommitStored(selection);
				}
			}
			return true;
		} finally {
			if (trace)
				GitTraceLocation.getTrace().traceExit(
						GitTraceLocation.HISTORYVIEW.getLocation());
		}
	}