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org.media.mn8.util
Class SimpleExpression  

java.lang.Object
  org.media.mn8.util.SimpleExpression

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public class SimpleExpression

extends java.lang.Object

The SimpleExpression class implements a simple expression parser. The only operators of a simple expression are:

• * - match everything, like the "." in regular expressions
• # - selects everything

It performs only two functions:

• select -selects all the apparence of the strings marked with the select ("#") operator
• match - verifies if a string matches the pattern specified using normal characters and the two operators.

It is intended as a simple replacement for regular expression in the case of simple expressions.

Version:

$Revision: 1.28 $ $Date: 2002/03/22 18:38:24 $

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Field Summary
private static java.lang.String	_MATCH_ALL
private static java.lang.String	_SELECT_ALL

 

Constructor Summary

SimpleExpression()

 

Method Summary
static boolean	contains(java.lang.String target, java.lang.String pattern)
private static java.lang.String	convert(java.lang.String target)
private static boolean	isOpenEnded(java.lang.String[] tokens, int index)
protected static boolean	isOperator(java.lang.String target)
private static boolean	isStartsOpened(java.lang.String[] tokens, int index)
private static boolean	isStartsWithMatch(java.lang.String target, java.lang.String[] tokens)
private static boolean	isValidPattern(java.lang.String pattern)
protected static int	lookAhead(java.lang.String token, java.lang.String target, int targetIndex)           Tries to find the token in the target string starting with the targetIndex position.
protected static java.lang.String[]	makeTokens(java.lang.String pattern)
static boolean	match(java.lang.String target, java.lang.String pattern)           Specifies if a pattern matches the target string or not.
protected static int	operatorOccurences(java.lang.String target, java.lang.String operator)
static java.util.Collection	select(java.lang.String target, java.lang.String pattern)           Selects a collection of strings from the target using as mask the pattern and the two operators "#" and "*".

 

Methods inherited from class java.lang.Object

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

 

Field Detail

_MATCH_ALL

private static final java.lang.String _MATCH_ALL

See Also:

Constant Field Values

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_SELECT_ALL

private static final java.lang.String _SELECT_ALL

See Also:

Constant Field Values

Constructor Detail

SimpleExpression

public SimpleExpression()

Method Detail

select

public static java.util.Collection select(java.lang.String target,
                                          java.lang.String pattern)

Selects a collection of strings from the target using as mask the pattern and the two operators "#" and "*".

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match

public static boolean match(java.lang.String target,
                            java.lang.String pattern)

Specifies if a pattern matches the target string or not.

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isOpenEnded

private static boolean isOpenEnded(java.lang.String[] tokens,
                                   int index)

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isStartsWithMatch

private static boolean isStartsWithMatch(java.lang.String target,
                                         java.lang.String[] tokens)

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isStartsOpened

private static boolean isStartsOpened(java.lang.String[] tokens,
                                      int index)

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convert

private static java.lang.String convert(java.lang.String target)

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contains

public static boolean contains(java.lang.String target,
                               java.lang.String pattern)

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lookAhead

protected static int lookAhead(java.lang.String token,
                               java.lang.String target,
                               int targetIndex)

Tries to find the token in the target string starting with the targetIndex position.

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makeTokens

protected static java.lang.String[] makeTokens(java.lang.String pattern)

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operatorOccurences

protected static int operatorOccurences(java.lang.String target,
                                        java.lang.String operator)

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isOperator

protected static boolean isOperator(java.lang.String target)

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isValidPattern

private static boolean isValidPattern(java.lang.String pattern)

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