package org.apache.lucene.index.codecs.preflexrw;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.
*/
import java.io.IOException;
import org.apache.lucene.index.SegmentWriteState;
import org.apache.lucene.index.SegmentReadState;
import org.apache.lucene.index.codecs.preflex.PreFlexCodec;
import org.apache.lucene.index.codecs.preflex.PreFlexFields;
import org.apache.lucene.index.codecs.FieldsConsumer;
import org.apache.lucene.index.codecs.FieldsProducer;
import org.apache.lucene.util.LuceneTestCaseJ4;
/** Codec, only for testing, that can write and read the
* pre-flex index format.
*
* @lucene.experimental
*/
public class PreFlexRWCodec extends PreFlexCodec {
public PreFlexRWCodec() {
// NOTE: we impersonate the PreFlex codec so that it can
// read the segments we write!
super();
}
@Override
public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws IOException {
return new PreFlexFieldsWriter(state);
}
@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
// Whenever IW opens readers, eg for merging, we have to
// keep terms order in UTF16:
return new PreFlexFields(state.dir, state.fieldInfos, state.segmentInfo, state.readBufferSize, state.termsIndexDivisor) {
@Override
protected boolean sortTermsByUnicode() {
// We carefully peek into stack track above us: if
// we are part of a "merge", we must sort by UTF16:
boolean unicodeSortOrder = true;
StackTraceElement[] trace = new Exception().getStackTrace();
for (int i = 0; i < trace.length; i++) {
//System.out.println(trace[i].getClassName());
if ("merge".equals(trace[i].getMethodName())) {
unicodeSortOrder = false;
if (LuceneTestCaseJ4.VERBOSE) {
System.out.println("NOTE: PreFlexRW codec: forcing legacy UTF16 term sort order");
}
break;
}
}
return unicodeSortOrder;
}
};
}
}