/**
* 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.
*/
package org.apache.solr.analysis;
import org.apache.lucene.analysis.NumericTokenStream;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.solr.common.SolrException;
import org.apache.solr.schema.DateField;
import static org.apache.solr.schema.TrieField.TrieTypes;
import java.io.IOException;
import java.io.Reader;
/**
* Tokenizer for trie fields. It uses NumericTokenStream to create multiple trie encoded string per number.
* Each string created by this tokenizer for a given number differs from the previous by the given precisionStep.
* For query time token streams that only contain the highest precision term, use 32/64 as precisionStep.
* <p/>
* Refer to {@link org.apache.lucene.search.NumericRangeQuery} for more details.
*
* @version $Id: TrieTokenizerFactory.java 1061000 2011-01-19 21:29:17Z uschindler $
* @see org.apache.lucene.search.NumericRangeQuery
* @see org.apache.solr.schema.TrieField
* @since solr 1.4
*/
public class TrieTokenizerFactory extends BaseTokenizerFactory {
protected final int precisionStep;
protected final TrieTypes type;
public TrieTokenizerFactory(TrieTypes type, int precisionStep) {
this.type = type;
this.precisionStep = precisionStep;
}
public TrieTokenizer create(Reader input) {
return new TrieTokenizer(input, type, precisionStep, TrieTokenizer.getNumericTokenStream(precisionStep));
}
}
final class TrieTokenizer extends Tokenizer {
protected static final DateField dateField = new DateField();
protected final int precisionStep;
protected final TrieTypes type;
protected final NumericTokenStream ts;
protected final OffsetAttribute ofsAtt = addAttribute(OffsetAttribute.class);
protected int startOfs, endOfs;
static NumericTokenStream getNumericTokenStream(int precisionStep) {
return new NumericTokenStream(precisionStep);
}
public TrieTokenizer(Reader input, TrieTypes type, int precisionStep, NumericTokenStream ts) {
// must share the attribute source with the NumericTokenStream we delegate to
super(ts);
this.type = type;
this.precisionStep = precisionStep;
this.ts = ts;
try {
reset(input);
} catch (IOException e) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Unable to create TrieIndexTokenizer", e);
}
}
@Override
public void reset(Reader input) throws IOException {
try {
super.reset(input);
input = super.input;
char[] buf = new char[32];
int len = input.read(buf);
this.startOfs = correctOffset(0);
this.endOfs = correctOffset(len);
String v = new String(buf, 0, len);
switch (type) {
case INTEGER:
ts.setIntValue(Integer.parseInt(v));
break;
case FLOAT:
ts.setFloatValue(Float.parseFloat(v));
break;
case LONG:
ts.setLongValue(Long.parseLong(v));
break;
case DOUBLE:
ts.setDoubleValue(Double.parseDouble(v));
break;
case DATE:
ts.setLongValue(dateField.parseMath(null, v).getTime());
break;
default:
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Unknown type for trie field");
}
} catch (IOException e) {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "Unable to create TrieIndexTokenizer", e);
}
}
@Override
public void close() throws IOException {
super.close();
ts.close();
}
@Override
public void reset() throws IOException {
super.reset();
ts.reset();
}
@Override
public boolean incrementToken() throws IOException {
if (ts.incrementToken()) {
ofsAtt.setOffset(startOfs, endOfs);
return true;
}
return false;
}
@Override
public void end() throws IOException {
ts.end();
ofsAtt.setOffset(endOfs, endOfs);
}
}