/**
* License Agreement for OpenSearchServer
*
* Copyright (C) 2014 Emmanuel Keller / Jaeksoft
*
* http://www.open-search-server.com
*
* This file is part of OpenSearchServer.
*
* OpenSearchServer is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* OpenSearchServer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenSearchServer.
* If not, see <http://www.gnu.org/licenses/>.
**/
package com.jaeksoft.searchlib.analysis.filter;
import java.io.IOException;
import java.util.regex.Pattern;
import org.apache.lucene.analysis.TokenStream;
import com.jaeksoft.searchlib.SearchLibException;
import com.jaeksoft.searchlib.analysis.ClassPropertyEnum;
import com.jaeksoft.searchlib.analysis.FilterFactory;
import com.jaeksoft.searchlib.util.StringUtils;
public class RegularExpressionReplaceFilter extends FilterFactory {
private Pattern pattern = null;
private String replace = null;
@Override
protected void initProperties() throws SearchLibException {
super.initProperties();
addProperty(ClassPropertyEnum.REGULAR_EXPRESSION, "", null, 30, 1);
addProperty(ClassPropertyEnum.REGULAR_EXPRESSION_REPLACEMENT, "", null,
30, 1);
}
@Override
public void checkValue(ClassPropertyEnum prop, String value)
throws SearchLibException {
if (value == null || value.length() == 0)
return;
if (prop == ClassPropertyEnum.REGULAR_EXPRESSION)
pattern = Pattern.compile(value);
else if (prop == ClassPropertyEnum.REGULAR_EXPRESSION_REPLACEMENT)
replace = value;
}
@Override
public TokenStream create(TokenStream tokenStream) {
return new RegularExpressionReplaceTokenFilter(pattern, replace,
tokenStream);
}
public static class RegularExpressionReplaceTokenFilter extends
AbstractTermFilter {
private final Pattern pattern;
private final String replace;
protected RegularExpressionReplaceTokenFilter(Pattern pattern,
String replace, TokenStream input) {
super(input);
this.pattern = pattern;
this.replace = replace == null ? StringUtils.EMPTY : replace;
}
@Override
public final boolean incrementToken() throws IOException {
for (;;) {
if (!input.incrementToken())
return false;
synchronized (pattern) {
if (createToken(pattern.matcher(termAtt.toString())
.replaceAll(replace)))
return true;
}
}
}
}
public final static void main(String[] args) {
System.out.println("january, 1999".replaceAll("^.* ([0-9]*)$", "$1"));
System.out.println(Pattern.compile("^.* ([0-9]*)$")
.matcher("january, 1999").replaceAll("$1"));
}
}