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Copy of MonetDB java directory changeset e6e32756ad31.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 21 Sep 2016 09:34:48 +0200 (2016-09-21)
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2016 MonetDB B.V.
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7 */
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8
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9 package nl.cwi.monetdb.mcl.parser;
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10
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11
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12 /**
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13 * Interface for parsers in MCL. The parser family in MCL is set up as
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14 * a reusable object. This allows the same parser to be used again for
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15 * the same type of work. While this is a very unnatural solution in
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16 * the Java language, it prevents many object creations on a low level
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17 * of the protocol. This favours performance.
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18 *
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19 * A typical parser has a method parse() which takes a String, and the
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20 * methods hasNext() and next() to retrieve the values that were
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21 * extracted by the parser. Parser specific methods may be available to
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22 * perform common tasks.
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23 *
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24 * @author Fabian Groffen
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25 */
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26 public abstract class MCLParser {
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27 /** The String values found while parsing. Public, you may touch it. */
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28 public final String values[];
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29 /** The int values found while parsing. Public, you may touch it. */
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30 public final int intValues[];
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31 private int colnr;
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32
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33 /**
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34 * Creates an MCLParser targetted at a given number of field values.
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35 * The lines parsed by an instance of this MCLParser should have
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36 * exactly capacity field values.
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37 *
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38 * @param capacity the number of field values to expect
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39 */
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40 protected MCLParser(int capacity) {
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41 values = new String[capacity];
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42 intValues = new int[capacity];
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43 }
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44
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45 /**
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46 * Parse the given string, and populate the internal field array
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47 * to allow for next() and hasNext() calls.
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48 *
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49 * @param source the String containing the line to parse
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50 * @return value
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51 * @throws MCLParseException if source cannot be (fully) parsed by
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52 * this parser
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53 * @see #next()
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54 * @see #nextInt()
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55 * @see #hasNext()
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56 */
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57 abstract public int parse(String source) throws MCLParseException;
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58
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59 /**
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60 * Repositions the internal field offset to the start, such that the
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61 * next call to next() will return the first field again.
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62 */
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63 final public void reset() {
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64 colnr = 0;
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65 }
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66
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67 /**
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68 * Returns whether the next call to next() or nextInt() succeeds.
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69 *
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70 * @return true if the next call to next() or nextInt() is bound to
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71 * succeed
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72 * @see #next()
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73 * @see #nextInt()
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74 */
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75 final public boolean hasNext() {
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76 return colnr < values.length;
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77 }
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78
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79 /**
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80 * Returns the current field value, and advances the field counter
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81 * to the next value. This method may fail with a RuntimeError if
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82 * the current field counter is out of bounds. Call hasNext() to
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83 * determine if the call to next() will succeed.
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84 *
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85 * @return the current field value
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86 * @see #nextInt()
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87 * @see #hasNext()
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88 */
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89 final public String next() {
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90 return values[colnr++];
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91 }
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92
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93 /**
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94 * Returns the current field value as integer, and advances the
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95 * field counter to the next value. This method has the same
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96 * characteristics as the next() method, apart from returning the
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97 * field value as an integer.
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98 *
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99 * @return the current field value as integer
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100 * @see #next()
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101 */
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102 final public int nextInt() {
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103 return intValues[colnr++];
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104 }
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105 }