| /* |
| * 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(@SuppressWarnings({"rawtypes"})Map context |
| , LeafReaderContext readerContext) throws IOException { |
| |
| final Terms terms = readerContext.reader().terms(indexedField); |
| |
| @SuppressWarnings({"unchecked"}) |
| 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; |
| } |
| } |