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Apache Solr (module: core)
/*
* 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.search;
import java.io.IOException;
import java.util.Map;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.PostingsEnum;
import org.apache.lucene.index.Terms;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.queries.function.docvalues.FloatDocValues;
import org.apache.lucene.queries.payloads.PayloadDecoder;
import org.apache.lucene.queries.payloads.PayloadFunction;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.util.BytesRef;
public class FloatPayloadValueSource extends ValueSource {
protected final String field;
protected final String val;
protected final String indexedField;
protected final BytesRef indexedBytes;
protected final PayloadDecoder decoder;
protected final PayloadFunction payloadFunction;
protected final ValueSource defaultValueSource;
public FloatPayloadValueSource(String field, String val, String indexedField, BytesRef indexedBytes,
PayloadDecoder decoder, PayloadFunction payloadFunction, ValueSource defaultValueSource) {
this.field = field;
this.val = val;
this.indexedField = indexedField;
this.indexedBytes = indexedBytes;
this.decoder = decoder;
this.payloadFunction = payloadFunction;
this.defaultValueSource = defaultValueSource;
}
@Override
public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException {
final Terms terms = readerContext.reader().terms(indexedField);
FunctionValues defaultValues = defaultValueSource.getValues(context, readerContext);
// copied the bulk of this from TFValueSource - TODO: this is a very repeated pattern - base-class this advance logic stuff?
return new FloatDocValues(this) {
PostingsEnum docs ;
int atDoc;
int lastDocRequested = -1;
float docScore = 0.f;
{ reset(); }
public void reset() throws IOException {
// no one should call us for deleted docs?
if (terms != null) {
final TermsEnum termsEnum = terms.iterator();
if (termsEnum.seekExact(indexedBytes)) {
docs = termsEnum.postings(null, PostingsEnum.ALL);
} else {
docs = null;
}
} else {
docs = null;
}
if (docs == null) {
// dummy PostingsEnum so floatVal() can work
// when would this be called? if field/val did not match? this is called for every doc? create once and cache?
docs = new PostingsEnum() {
@Override
public int freq() {
return 0;
}
@Override
public int nextPosition() throws IOException {
return -1;
}
@Override
public int startOffset() throws IOException {
return -1;
}
@Override
public int endOffset() throws IOException {
return -1;
}
@Override
public BytesRef getPayload() throws IOException {
return null;
}
@Override
public int docID() {
return DocIdSetIterator.NO_MORE_DOCS;
}
@Override
public int nextDoc() {
return DocIdSetIterator.NO_MORE_DOCS;
}
@Override
public int advance(int target) {
return DocIdSetIterator.NO_MORE_DOCS;
}
@Override
public long cost() {
return 0;
}
};
}
atDoc = -1;
}
@Override
public float floatVal(int doc) {
try {
if (doc < lastDocRequested) {
// out-of-order access.... reset
reset();
}
else if (doc == lastDocRequested) {
return docScore;
}
lastDocRequested = doc;
if (atDoc < doc) {
atDoc = docs.advance(doc);
}
if (atDoc > doc) {
// term doesn't match this document... either because we hit the
// end, or because the next doc is after this doc.
docScore = defaultValues.floatVal(doc);
return docScore;
}
// a match!
int freq = docs.freq();
int numPayloadsSeen = 0;
float currentScore = 0;
for (int i=0; i < freq; i++) {
docs.nextPosition();
BytesRef payload = docs.getPayload();
if (payload != null) {
float payloadVal = decoder.computePayloadFactor(payload);
// payloadFunction = null represents "first"
if (payloadFunction == null) return payloadVal;
currentScore = payloadFunction.currentScore(doc, indexedField, docs.startOffset(), docs.endOffset(),
numPayloadsSeen, currentScore, payloadVal);
numPayloadsSeen++;
}
}
docScore = (numPayloadsSeen > 0) ? payloadFunction.docScore(doc, indexedField, numPayloadsSeen, currentScore) : defaultValues.floatVal(doc);
return docScore;
} catch (IOException e) {
throw new RuntimeException("caught exception in function "+description()+" : doc="+doc, e);
}
}
};
}
// TODO: should this be formalized at the ValueSource level? Seems to be the convention
public String name() {
return "payload";
}
@Override
public String description() {
return name() + '(' + field + ',' + val + ',' + defaultValueSource.toString() + ')';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
FloatPayloadValueSource that = (FloatPayloadValueSource) o;
if (!indexedField.equals(that.indexedField)) return false;
if (indexedBytes != null ? !indexedBytes.equals(that.indexedBytes) : that.indexedBytes != null) return false;
if (!decoder.equals(that.decoder)) return false;
if (payloadFunction != null ? !payloadFunction.equals(that.payloadFunction) : that.payloadFunction != null)
return false;
return defaultValueSource.equals(that.defaultValueSource);
}
@Override
public int hashCode() {
int result = indexedField.hashCode();
result = 31 * result + (indexedBytes != null ? indexedBytes.hashCode() : 0);
result = 31 * result + decoder.hashCode();
result = 31 * result + (payloadFunction != null ? payloadFunction.hashCode() : 0);
result = 31 * result + defaultValueSource.hashCode();
return result;
}
}