| /* |
| * 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.sysds.runtime.util; |
| |
| import java.io.Serializable; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * This string tokenizer is essentially a simplified StringTokenizer. |
| * In addition to the default functionality it allows to reset the tokenizer and it makes |
| * the simplifying assumptions of (1) no returns delimiter, and (2) single character delimiter. |
| * |
| */ |
| public class FastStringTokenizer implements Serializable |
| { |
| private static final long serialVersionUID = 4051436015710778611L; |
| private String _string = null; |
| private char _del = 0; |
| private int _pos = -1; |
| |
| /** |
| * Constructs a new StringTokenizer for string using the specified |
| * delimiter |
| * |
| * @param delimiter |
| * the delimiter to use |
| */ |
| public FastStringTokenizer(char delimiter) { |
| _del = delimiter; |
| reset( null ); |
| } |
| |
| public void reset( String string ) { |
| _string = string; |
| _pos = 0; |
| } |
| |
| /** |
| * Returns the next token in the string as a String. |
| * |
| * @return next token in the string as a String |
| */ |
| public String nextToken() { |
| int len = _string.length(); |
| int start = _pos; |
| |
| //find start (skip over leading delimiters) |
| while(start < len && _del == _string.charAt(start) ) |
| start++; |
| |
| //find end (next delimiter) and return |
| if(start < len) { |
| _pos = _string.indexOf(_del, start); |
| if( start < _pos && _pos < len ) |
| return _string.substring(start, _pos); |
| else |
| return _string.substring(start); |
| } |
| //no next token |
| throw new NoSuchElementException(); |
| } |
| |
| public int nextInt() { |
| return Integer.parseInt( nextToken() ); |
| } |
| |
| public long nextLong() { |
| return Long.parseLong( nextToken() ); |
| } |
| |
| public double nextDouble() { |
| return UtilFunctions.parseToDouble(nextToken(),UtilFunctions.defaultNaString); |
| } |
| } |