SrndTruncQuerypublic class SrndTruncQuery extends SimpleTerm | Copyright 2005 The Apache Software Foundation
Licensed 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. |
| Fields Summary |
|---|
| private final String | truncated | | private final char | unlimited | | private final char | mask | | private String | prefix | | private Pattern | pattern |
| Constructors Summary |
|---|
public SrndTruncQuery(String truncated, char unlimited, char mask)
super(false); /* not quoted */
this.truncated = truncated;
this.unlimited = unlimited;
this.mask = mask;
truncatedToPrefixAndPattern();
|
| Methods Summary |
|---|
| protected void | appendRegExpForChar(char c, java.lang.StringBuffer re)
if (c == unlimited)
re.append(".*");
else if (c == mask)
re.append(".");
else
re.append(c);
| | public java.lang.String | getTruncated()return truncated;
| | protected boolean | matchingChar(char c)
return (c != unlimited) && (c != mask);
| | public java.lang.String | toStringUnquoted()return getTruncated();
| | protected void | truncatedToPrefixAndPattern()
int i = 0;
while ((i < truncated.length()) && matchingChar(truncated.charAt(i))) {
i++;
}
prefix = truncated.substring(0, i);
StringBuffer re = new StringBuffer();
while (i < truncated.length()) {
appendRegExpForChar(truncated.charAt(i), re);
i++;
}
pattern = Pattern.compile(re.toString());
| | public void | visitMatchingTerms(org.apache.lucene.index.IndexReader reader, java.lang.String fieldName, MatchingTermVisitor mtv)
boolean expanded = false;
int prefixLength = prefix.length();
TermEnum enumerator = reader.terms(new Term(fieldName, prefix));
Matcher matcher = pattern.matcher("");
try {
do {
Term term = enumerator.term();
if (term != null) {
String text = term.text();
if ((! text.startsWith(prefix)) || (! term.field().equals(fieldName))) {
break;
} else {
matcher.reset( text.substring(prefixLength));
if (matcher.matches()) {
mtv.visitMatchingTerm(term);
expanded = true;
}
}
}
} while (enumerator.next());
} finally {
enumerator.close();
matcher.reset();
}
if (! expanded) {
System.out.println("No terms in " + fieldName + " field for: " + toString());
}
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