/*
* Licensed to Crate under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership. Crate licenses this file
* to you 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial
* agreement.
*/
package io.crate.lucene.match;
import org.apache.lucene.index.FilteredTermsEnum;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.util.BytesRef;
/**
* Subclass of FilteredTermEnum for enumerating all terms that match the
* specified regular expression term using the specified regular expression
* implementation.
* <p>
* Term enumerations are always ordered by Term.compareTo(). Each term in
* the enumeration is greater than all that precede it.
*/
class CrateRegexTermsEnum extends FilteredTermsEnum {
private CrateRegexCapabilities.JavaUtilRegexMatcher regexImpl;
CrateRegexTermsEnum(TermsEnum tenum, Term term, int flags) {
super(tenum);
String text = term.text();
this.regexImpl = CrateRegexCapabilities.compile(text, flags);
setInitialSeekTerm(new BytesRef(""));
}
@Override
protected AcceptStatus accept(BytesRef term) {
return regexImpl.match(term) ? AcceptStatus.YES : AcceptStatus.NO;
}
}