com.goldencode.p2j.util

Class LogicalExpressionConverter.Lexer

java.lang.Object

com.goldencode.p2j.util.LogicalExpressionConverter.Lexer

Enclosing class:

LogicalExpressionConverter

private static class LogicalExpressionConverter.Lexer
extends java.lang.Object

Lexer which builds a token stream from the match expression.

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	caseSensitive Should matches be checked case-sensitively?
private java.util.regex.Pattern	charsToSkip Regex pattern for characters to be skipped by readNextToken()
private LogicalExpressionConverter.EToken	current Token most recently read from the expression
private boolean	hasDelim Flag indicating if the last char(s) read was a word delimiter.
private int	ord The ordinal for a next found term
private java.io.Reader	reader String reader stream
private static java.lang.String	SPECIAL_DELIMS A list o special delimiters used like: "&" (AND), "|" (OR)
private java.util.Map<java.lang.String,LogicalExpressionConverter.Term>	terms Distinct terms found in the expression

Constructor Summary

Constructors

Modifier	Constructor and Description
private	Lexer(java.io.Reader reader, java.lang.String delims, boolean caseSensitive) Constructor.

Method Summary

Modifier and Type	Method and Description
(package private) void	consume() Mark the current token as having been consumed.
private boolean	isToBeSkipped(char c) Check if a character is to be skipped when reading the next token.
private void	readNextToken() Read the next token from the match expression.
(package private) LogicalExpressionConverter.EToken	token() Return the most recently read token, or null if no more tokens are available.
private void	wildcardError() Record or throw an error about incorrect wildcard syntax.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

reader

private final java.io.Reader reader

String reader stream

caseSensitive

private final boolean caseSensitive

Should matches be checked case-sensitively?

SPECIAL_DELIMS

private static final java.lang.String SPECIAL_DELIMS

A list o special delimiters used like: "&" (AND), "|" (OR)

See Also:

Constant Field Values

charsToSkip

private java.util.regex.Pattern charsToSkip

Regex pattern for characters to be skipped by readNextToken()

current

private LogicalExpressionConverter.EToken current

Token most recently read from the expression

hasDelim

private boolean hasDelim

Flag indicating if the last char(s) read was a word delimiter.

terms

private final java.util.Map<java.lang.String,LogicalExpressionConverter.Term> terms

Distinct terms found in the expression

ord

private int ord

The ordinal for a next found term

Constructor Detail

Lexer

private Lexer(java.io.Reader reader,
              java.lang.String delims,
              boolean caseSensitive)

Constructor.

Parameters:

reader - Reader stream on the match expression text.

delims - A regex list for delimiters to use when splitting a word.

caseSensitive - true to perform word match comparisons case-sensitively, false to ignore case.

Method Detail

token

LogicalExpressionConverter.EToken token()
                                 throws java.io.IOException

Return the most recently read token, or null if no more tokens are available.

Returns:

Current token or null.

Throws:

java.io.IOException - if there is an I/O error reading from the stream.

consume

void consume()

Mark the current token as having been consumed.

isToBeSkipped

private boolean isToBeSkipped(char c)
                       throws java.io.IOException

Check if a character is to be skipped when reading the next token. true if c is a delimiter, but not one of [-,.&|^!()], characters in [-,.] are part of a word only if followed by a digit; false if c is a part of a word or a special delimiter

Parameters:

c - the character to be checked.

Returns:

if a character is to be skipped when reading next token.

Throws:

java.io.IOException - if there is an I/O error reading from the stream.

readNextToken

private void readNextToken()
                    throws java.io.IOException

Read the next token from the match expression.

Throws:

java.io.IOException - if there is an I/O error reading from the stream.

wildcardError

private void wildcardError()

Record or throw an error about incorrect wildcard syntax.

Throws:

ErrorConditionException - always.