Java Code Examples for java.util.Deque#pollFirst()
The following examples show how to use
java.util.Deque#pollFirst() .
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Example 1
Source File: ZKUtil.java From hbase with Apache License 2.0 | 6 votes |
/** * BFS Traversal of all the children under path, with the entries in the list, * in the same order as that of the traversal. Lists all the children without * setting any watches. * * @param zkw * - zk reference * @param znode * - path of node * @return list of children znodes under the path * @throws KeeperException * if unexpected ZooKeeper exception */ private static List<String> listChildrenBFSNoWatch(ZKWatcher zkw, final String znode) throws KeeperException { Deque<String> queue = new LinkedList<>(); List<String> tree = new ArrayList<>(); queue.add(znode); while (true) { String node = queue.pollFirst(); if (node == null) { break; } List<String> children = listChildrenNoWatch(zkw, node); if (children == null) { continue; } for (final String child : children) { final String childPath = node + "/" + child; queue.add(childPath); tree.add(childPath); } } return tree; }
Example 2
Source File: Solution11.java From LeetCode-Solution-in-Good-Style with Apache License 2.0 | 6 votes |
public int[] maxSlidingWindow(int[] nums, int k) { int len = nums.length; if (len < 1) { return new int[0]; } int[] res = new int[len - k + 1]; Deque<Integer> deque = new ArrayDeque<>(k + 1); for (int i = 0; i < len; i++) { // 考虑删除队首元素 if (i >= k && !deque.isEmpty() && deque.peekFirst() == i - k) { deque.pollFirst(); } while (!deque.isEmpty() && nums[deque.peekLast()] < nums[i]) { deque.pollLast(); } deque.addLast(i); // 形成一个单调不减的队列,队首是滑动窗口的最大值 // 记录结果集 if (i >= k - 1) { res[i - k + 1] = nums[deque.peekFirst()]; } } return res; }
Example 3
Source File: Nodes.java From dragonwell8_jdk with GNU General Public License v2.0 | 6 votes |
/** * Depth first search, in left-to-right order, of the node tree, using * an explicit stack, to find the next non-empty leaf node. */ @SuppressWarnings("unchecked") protected final N findNextLeafNode(Deque<N> stack) { N n = null; while ((n = stack.pollFirst()) != null) { if (n.getChildCount() == 0) { if (n.count() > 0) return n; } else { for (int i = n.getChildCount() - 1; i >= 0; i--) stack.addFirst((N) n.getChild(i)); } } return null; }
Example 4
Source File: DistribStateManager.java From lucene-solr with Apache License 2.0 | 6 votes |
/** * List a subtree including the root path, using breadth-first traversal. * @param root root path * @return list of full paths, with the root path being the first element */ default List<String> listTree(String root) throws NoSuchElementException, IOException, KeeperException, InterruptedException { Deque<String> queue = new LinkedList<String>(); List<String> tree = new ArrayList<String>(); if (!root.startsWith("/")) { root = "/" + root; } queue.add(root); tree.add(root); while (true) { String node = queue.pollFirst(); if (node == null) { break; } List<String> children = listData(node); for (final String child : children) { final String childPath = node + (node.equals("/") ? "" : "/") + child; queue.add(childPath); tree.add(childPath); } } return tree; }
Example 5
Source File: ZKTools.java From uncode-schedule with Apache License 2.0 | 6 votes |
/** * BFS Traversal of the system under pathRoot, with the entries in the list, * in the same order as that of the traversal. * <p> * <b>Important:</b> This is <i>not an atomic snapshot</i> of the tree ever, * but the state as it exists across multiple RPCs from zkClient to the * ensemble. For practical purposes, it is suggested to bring the clients to * the ensemble down (i.e. prevent writes to pathRoot) to 'simulate' a * snapshot behavior. * * @param zk * @param pathRoot * The znode path, for which the entire subtree needs to be listed. * @throws Exception */ public static List<String> listSubTreeBFS(ZooKeeper zk, final String pathRoot) throws Exception { Deque<String> queue = new LinkedList<String>(); List<String> tree = new ArrayList<String>(); queue.add(pathRoot); tree.add(pathRoot); while (true) { String node = queue.pollFirst(); if (node == null) { break; } List<String> children = zk.getChildren(node, false); for (final String child : children) { final String childPath = node + "/" + child; queue.add(childPath); tree.add(childPath); } } return tree; }
Example 6
Source File: Nodes.java From jdk8u_jdk with GNU General Public License v2.0 | 6 votes |
/** * Depth first search, in left-to-right order, of the node tree, using * an explicit stack, to find the next non-empty leaf node. */ @SuppressWarnings("unchecked") protected final N findNextLeafNode(Deque<N> stack) { N n = null; while ((n = stack.pollFirst()) != null) { if (n.getChildCount() == 0) { if (n.count() > 0) return n; } else { for (int i = n.getChildCount() - 1; i >= 0; i--) stack.addFirst((N) n.getChild(i)); } } return null; }
Example 7
Source File: Nodes.java From openjdk-jdk9 with GNU General Public License v2.0 | 6 votes |
/** * Depth first search, in left-to-right order, of the node tree, using * an explicit stack, to find the next non-empty leaf node. */ @SuppressWarnings("unchecked") protected final N findNextLeafNode(Deque<N> stack) { N n = null; while ((n = stack.pollFirst()) != null) { if (n.getChildCount() == 0) { if (n.count() > 0) return n; } else { for (int i = n.getChildCount() - 1; i >= 0; i--) stack.addFirst((N) n.getChild(i)); } } return null; }
Example 8
Source File: TreeTraversals.java From interview with Apache License 2.0 | 6 votes |
public void inorderItr(Node root){ Deque<Node> stack = new LinkedList<Node>(); Node node = root; while(true){ if(node != null){ stack.addFirst(node); node = node.left; } else{ if(stack.isEmpty()){ break; } node = stack.pollFirst(); System.out.println(node.data); node = node.right; } } }
Example 9
Source File: DefaultZooKeeperClient.java From helios with Apache License 2.0 | 6 votes |
@Override public List<String> listRecursive(final String path) throws KeeperException { assertClusterIdFlagTrue(); final Deque<String> queue = newLinkedList(); final List<String> tree = newArrayList(); queue.add(path); tree.add(path); while (!queue.isEmpty()) { final String node = queue.pollFirst(); final List<String> children = getChildren(node); for (final String child : children) { final String childPath = node.replaceAll("/$", "") + "/" + child; queue.add(childPath); tree.add(childPath); } } return tree; }
Example 10
Source File: OptionsParser.java From bazel with Apache License 2.0 | 5 votes |
/** * Collects the arguments for a command line flag until it finds a flag that starts with the * terminatorPrefix. * * @param output where to put the collected flag arguments. * @param args * @param terminatorPrefix the terminator prefix to stop collecting of argument flags. */ private static void collectFlagArguments( Collection<String> output, Deque<String> args, String terminatorPrefix) { for (String arg = args.pollFirst(); arg != null; arg = args.pollFirst()) { if (arg.startsWith(terminatorPrefix)) { args.addFirst(arg); break; } output.add(arg); } }
Example 11
Source File: AbstractParallelSourceBase.java From alibaba-flink-connectors with Apache License 2.0 | 5 votes |
@Override public InputSplit getNextInputSplit(String location, int taskIndex) { checkTaskIndex(taskIndex); Deque<InputSplit> unassignedSplitsForTask = unassignedSplitsByTask.get(taskIndex); InputSplit split = unassignedSplitsForTask.pollFirst(); if (split != null) { assignedSplits.put(split.getSplitNumber(), taskIndex); } return split; }
Example 12
Source File: DequeMultiMap.java From whiskey with Apache License 2.0 | 5 votes |
@Override public V removeFirst(Object key) { int sentinel = mutations; Deque<V> values = map.get(key); if (values == null) return null; V value = values.pollFirst(); size--; if (values.isEmpty()) map.remove(key); if (sentinel != mutations++) throw new ConcurrentModificationException(); return value; }
Example 13
Source File: _059_Max_Value_In_Slide_Window.java From algorithm-primer with MIT License | 5 votes |
public ArrayList<Integer> maxInWindows(int[] num, int size) { ArrayList<Integer> result = new ArrayList<>(); if (num == null || num.length == 0 || size < 1) return result; Deque<Integer> deque = new LinkedList<>(); for (int i = 0; i < num.length; i ++){ // 保证添加新的元素之前,窗口中首尾元素下标之差最大是size if (i > 0 && !deque.isEmpty()){ int firstIdx = deque.peekFirst(); int diff = i - firstIdx; if (diff == size) { deque.pollFirst(); } } // 同一个窗口中的元素如果小于新元素,则被删除 // 由于前面的元素总是大于后面的元素,所以从后面开始删除 while(!deque.isEmpty() && num[i] >= num[deque.peekLast()]) { deque.pollLast(); } // 新元素总是会被添加到双端队列的末尾 deque.offerLast(i); // 双端队列的队头存放的是一个窗口的最大值 if (i >= size-1) { result.add(num[deque.peekFirst()]); } } return result; }
Example 14
Source File: WiggleHelper.java From Wiggle with Apache License 2.0 | 5 votes |
@Override protected Frame extractFrameToFixPosition(long delayFrames, Deque<Frame> frameDeque) { if (frameDeque.size() > delayFrames) { return frameDeque.pollFirst(); } return frameDeque.getFirst(); }
Example 15
Source File: FeedbackChannel.java From flink-statefun with Apache License 2.0 | 5 votes |
@Override public void run() { final Deque<T> buffer = queue.drainAll(); try { T element; while ((element = buffer.pollFirst()) != null) { consumer.processFeedback(element); } } catch (Exception e) { throw new RuntimeException(e); } }
Example 16
Source File: ConsString.java From openjdk-jdk9 with GNU General Public License v2.0 | 5 votes |
private synchronized void flatten(final boolean flattenNested) { // We use iterative traversal as recursion may exceed the stack size limit. final char[] chars = new char[length]; int pos = length; // Strings are most often composed by appending to the end, which causes ConsStrings // to be very unbalanced, with mostly single string elements on the right and a long // linear list on the left. Traversing from right to left helps to keep the stack small // in this scenario. final Deque<CharSequence> stack = new ArrayDeque<>(); stack.addFirst(left); CharSequence cs = right; do { if (cs instanceof ConsString) { final ConsString cons = (ConsString) cs; // Count the times a cons-string is traversed as part of other cons-strings being flattened. // If it crosses a threshold we flatten the nested cons-string internally. if (cons.state == STATE_FLATTENED || (flattenNested && ++cons.state >= STATE_THRESHOLD)) { cs = cons.flattened(false); } else { stack.addFirst(cons.left); cs = cons.right; } } else { final String str = (String) cs; pos -= str.length(); str.getChars(0, str.length(), chars, pos); cs = stack.isEmpty() ? null : stack.pollFirst(); } } while (cs != null); left = new String(chars); right = ""; state = STATE_FLATTENED; }
Example 17
Source File: SerializeDeserializeBinaryTree.java From interview with Apache License 2.0 | 5 votes |
/** * Serialize tree using level order traversal. */ public String serializeLevelOrder(Node root) { if (root == null) { return ""; } Deque<Node> queue = new LinkedList<>(); queue.offerFirst(root); StringBuffer buff = new StringBuffer(); while (!queue.isEmpty()) { root = queue.pollFirst(); if (root == null) { buff.append("%,"); } else { buff.append(root.data).append(","); queue.offer(root.left); queue.offer(root.right); } } for (int i = buff.length() - 1; i >= 0; i--) { if (buff.charAt(i) == '%' || buff.charAt(i) == ',') { buff.deleteCharAt(i); } else { break; } } return buff.toString(); }
Example 18
Source File: SeparateAndConquerStrategy.java From RegexGenerator with GNU General Public License v3.0 | 5 votes |
private Node joinSolutions(List<Node> bests) { Deque<Node> nodes = new LinkedList<>(bests); Deque<Node> tmp = new LinkedList<>(); while (nodes.size() > 1) { while (nodes.size() > 0) { Node first = nodes.pollFirst(); Node second = nodes.pollFirst(); if (second != null) { Node or = new Or(); or.getChildrens().add(first); or.getChildrens().add(second); first.setParent(or); second.setParent(or); tmp.addLast(or); } else { tmp.addLast(first); } } nodes = tmp; tmp = new LinkedList<>(); } return nodes.getFirst(); }
Example 19
Source File: MCRFileSystemUtils.java From mycore with GNU General Public License v3.0 | 4 votes |
static MCRFile getMCRFile(MCRDirectory baseDir, MCRPath relativePath, boolean create, boolean createNew) throws IOException { MCRPath ifsPath = relativePath; if (relativePath.isAbsolute()) { if (baseDir.getOwnerID().equals(relativePath.getOwner())) { ifsPath = baseDir.toPath().relativize(relativePath); } else { throw new IOException(relativePath + " is absolute does not fit to " + baseDir.toPath()); } } Deque<MCRFilesystemNode> created = new LinkedList<>(); MCRFile file; try { file = (MCRFile) baseDir.getChildByPath(ifsPath.toString()); if (file != null && createNew) { throw new FileAlreadyExistsException(baseDir.toPath().resolve(ifsPath).toString()); } if (file == null & (create || createNew)) { Path normalized = ifsPath.normalize(); MCRDirectory parent = baseDir; int nameCount = normalized.getNameCount(); int directoryCount = nameCount - 1; int i = 0; while (i < directoryCount) { String curName = normalized.getName(i).toString(); MCRDirectory curDir = (MCRDirectory) parent.getChild(curName); if (curDir == null) { curDir = new MCRDirectory(curName, parent); created.addFirst(curDir); } i++; parent = curDir; } String fileName = normalized.getFileName().toString(); file = new MCRFile(fileName, parent); file.setContentFrom(new ByteArrayInputStream(new byte[0]), false);//false -> no event handler created.addFirst(file); } } catch (Exception e) { if (create || createNew) { LOGGER.error("Exception while getting MCRFile {}. Removing created filesystem nodes.", ifsPath); while (created.peekFirst() != null) { MCRFilesystemNode node = created.pollFirst(); try { node.delete(); } catch (Exception de) { LOGGER.fatal("Error while deleting file system node: {}", node.getName(), de); } } } throw e; } return file; }
Example 20
Source File: TextBlockRenderer.java From Spark-Reader with GNU General Public License v3.0 | 4 votes |
private int renderLine(TextBlock text, Graphics g, int x, int y) { if(text.getText() == null)return y;//don't render null text int startY = y; FontMetrics font = g.getFontMetrics(); TextStream stream = new TextStream(text.getText()); StringBuilder line = new StringBuilder(); Deque<String> lines = new LinkedList<>(); while(!stream.isDone()) { String nextBit = stream.nextWord(); if(font.stringWidth(line + nextBit) > width)//too much for this line, wrap over { lines.add(line.toString());//add line for rendering line = new StringBuilder(nextBit.trim());//put word on new line } else { line.append(nextBit); } } if(!line.toString().equals(""))lines.add(line.toString());//add last line //draw lines while(!lines.isEmpty()) { if(displayUpwards) line = new StringBuilder(lines.pollLast()); else line = new StringBuilder(lines.pollFirst()); //draw line defLines++; if(startLine <= defLines) { if(displayUpwards)y -= font.getHeight(); if(!displayUpwards) y += font.getHeight(); //print background g.setColor(text.getBackCol()); g.fillRect(x, y - font.getAscent(), width, font.getHeight()); //print text g.setColor(text.getTextCol()); g.drawString(line.toString(), x, y); } } //'gap' between def lines g.setColor(new Color(0, 0, 0, 1)); g.clearRect(x, y - font.getAscent() + (displayUpwards?0:font.getHeight() - 1), width,1);//clear this last line g.fillRect (x, y - font.getAscent() + (displayUpwards?0:font.getHeight() - 1), width,1);//add a dim line here so scrolling still works //capture if in this if(capturePoint <= -1 || (displayUpwards? (capturePoint <= startY - font.getHeight() + font.getDescent() && capturePoint > y - font.getHeight() + font.getDescent()): (capturePoint > startY + font.getDescent() && capturePoint <= y + font.getDescent()))) { //TODO allow export with HTML color info perhaps? if(capture.equals("")) { capture = text.getText(); } else { capture += "\n" + text; } } return y; }