swishej
Class SearchImpl

java.lang.Object
  |
  +--swishej.SearchImpl

class SearchImpl

extends java.lang.Object

Class implementing the SWISH-E search.

See Also:

SortResult, ResultList

Constructor Summary

(package private)

SearchImpl()

Method Summary

(package private) static StrList	expandstars(IndexFile inf, StrList wlist) Expand wildcards.
(package private) static StrList	fixnot(StrList wl) Traverse StrList of keywords and reformat it for later parsing.
(package private) static int	getrulenum(java.lang.String word) Return rule constant given word.
(package private) static boolean	isbooleanrule(java.lang.String word) Check if given word is a boolean rule.
(package private) static boolean	ismeta(java.lang.String word) Check if given word is a meta word for the search.
(package private) static boolean	isrule(java.lang.String word) Check if given word is a rule.
(package private) static boolean	isunaryrule(java.lang.String word) Check if given word is a unary rule.
(package private) static StrList	mkwlist(java.lang.String words) Given keyword string break it in words represented by a StrList.
(package private) static ResultList	operate(ResultList rl, int rulenum, java.lang.String word, int meta, int andLevel, IndexFile inf) Search the indexfile and accumulate results.
(package private) static ResultList	parseterm(StrList wordlist, boolean parseone, int meta, IndexFile inf) Parse next term in keyword list and search accordingly.
(package private) static java.lang.String	search(IndexFile inf, java.lang.String words, int maxhits, int structure, java.net.URL base) Perform keyword search.

Methods inherited from class java.lang.Object

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

Constructor Detail

SearchImpl

SearchImpl()

Method Detail

getrulenum

static int getrulenum(java.lang.String word)

Return rule constant given word.

Parameters:

word - word to be checked.

Returns:

rule constant, e.g. AND_RULE, OR_RULE etc.

isrule

static boolean isrule(java.lang.String word)

Check if given word is a rule.

Parameters:

word - word to be checked.

Returns:

true if word is a rule, e.g. "and", "or" etc.

isbooleanrule

static boolean isbooleanrule(java.lang.String word)

Check if given word is a boolean rule.

Parameters:

word - word to be checked.

Returns:

true if word is a binary rule, i.e. "and" or "or"

isunaryrule

static boolean isunaryrule(java.lang.String word)

Check if given word is a unary rule.

Parameters:

word - word to be checked.

Returns:

true if word is a unary rule, i.e. "not"

mkwlist

static StrList mkwlist(java.lang.String words)

Given keyword string break it in words represented by a StrList.

Parameters:

words - keyword string

Returns:

StrList of keywords

ismeta

static boolean ismeta(java.lang.String word)

Check if given word is a meta word for the search.

Parameters:

word - word to be checked

Returns:

true if word is meta word

fixnot

static StrList fixnot(StrList wl)

Traverse StrList of keywords and reformat it for later parsing.

Parameters:

wl - original keyword list

Returns:

reformatted keyword list

parseterm

static ResultList parseterm(StrList wordlist,
                            boolean parseone,
                            int meta,
                            IndexFile inf)

Parse next term in keyword list and search accordingly.

Parameters:

wordlist - keyword list

parseone - if true only one word is considered

meta - active meta word number for the search

inf - index to be searched

Returns:

ResultList of the term

operate

static ResultList operate(ResultList rl,
                          int rulenum,
                          java.lang.String word,
                          int meta,
                          int andLevel,
                          IndexFile inf)

Search the indexfile and accumulate results.

Parameters:

rl - ResultList from earlier invokations

rulenum - rule for merging results

word - current keyword to be searched

meta - active meta word number for the search

andLevel - nesting level of "and" term

inf - index to be searched

Returns:

new ResultList

expandstars

static StrList expandstars(IndexFile inf,
                           StrList wlist)

Expand wildcards.

Parameters:

word - list to be expanded

Returns:

new word list

search

static java.lang.String search(IndexFile inf,
                               java.lang.String words,
                               int maxhits,
                               int structure,
                               java.net.URL base)

Perform keyword search.

Parameters:

inf - index to be searched

words - keywords to be searched

maxhits - maximum number of hits

structure - which meta information to be considered

base - base URL or null, if not null result is HTML formatted

Returns:

search result