| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.thrift; |
| |
| /** |
| * ShortStack is a short-specific Stack implementation written for the express |
| * purpose of very fast operations on TCompactProtocol's field id stack. This |
| * implementation performs at least 10x faster than java.util.Stack. |
| */ |
| public class ShortStack { |
| |
| private short[] vector; |
| private int top = -1; |
| |
| public ShortStack(int initialCapacity) { |
| vector = new short[initialCapacity]; |
| } |
| |
| public short pop() { |
| return vector[top--]; |
| } |
| |
| public void push(short pushed) { |
| if (vector.length == top + 1) { |
| grow(); |
| } |
| vector[++top] = pushed; |
| } |
| |
| private void grow() { |
| short[] newVector = new short[vector.length * 2]; |
| System.arraycopy(vector, 0, newVector, 0, vector.length); |
| vector = newVector; |
| } |
| |
| public short peek() { |
| return vector[top]; |
| } |
| |
| public void clear() { |
| top = -1; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("<ShortStack vector:["); |
| for (int i = 0; i < vector.length; i++) { |
| if (i != 0) { |
| sb.append(" "); |
| } |
| |
| if (i == top) { |
| sb.append(">>"); |
| } |
| |
| sb.append(vector[i]); |
| |
| if (i == top) { |
| sb.append("<<"); |
| } |
| } |
| sb.append("]>"); |
| return sb.toString(); |
| } |
| } |