| /* |
| * 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 static org.apache.solr.common.SolrException.ErrorCode; |
| import static org.apache.solr.common.SolrException.ErrorCode.BAD_REQUEST; |
| |
| import java.util.Arrays; |
| import java.util.Locale; |
| import org.apache.lucene.index.VectorEncoding; |
| import org.apache.lucene.index.VectorSimilarityFunction; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.queries.function.valuesource.ByteVectorSimilarityFunction; |
| import org.apache.lucene.queries.function.valuesource.FloatVectorSimilarityFunction; |
| import org.apache.solr.common.SolrException; |
| import org.apache.solr.schema.DenseVectorField; |
| import org.apache.solr.schema.FieldType; |
| import org.apache.solr.schema.SchemaField; |
| |
| /** |
| * This class provides implementation for two variants for parsing function query vectorSimilarity |
| * which is used to calculate the similarity between two vectors. |
| */ |
| public class VectorSimilaritySourceParser extends ValueSourceParser { |
| @Override |
| public ValueSource parse(FunctionQParser fp) throws SyntaxError { |
| |
| final String arg1Str = fp.parseArg(); |
| if (arg1Str == null || !fp.hasMoreArguments()) |
| throw new SolrException( |
| BAD_REQUEST, "Invalid number of arguments. Please provide either two or four arguments."); |
| |
| final String arg2Str = peekIsConstVector(fp) ? null : fp.parseArg(); |
| if (fp.hasMoreArguments() && arg2Str != null) { |
| return handle4ArgsVariant(fp, arg1Str, arg2Str); |
| } |
| return handle2ArgsVariant(fp, arg1Str, arg2Str); |
| } |
| |
| /** |
| * returns true if and only if the next argument is a constant vector, taking into consideration |
| * that the next (literal) argument may be a param reference |
| */ |
| private boolean peekIsConstVector(final FunctionQParser fp) throws SyntaxError { |
| final char rawPeek = fp.sp.peek(); |
| if ('[' == rawPeek) { |
| return true; |
| } |
| if ('$' == rawPeek) { |
| final int savedPos = fp.sp.pos; |
| try { |
| final String rawParam = fp.parseArg(); |
| return ((null != rawParam) && ('[' == (new StrParser(rawParam)).peek())); |
| } finally { |
| fp.sp.pos = savedPos; |
| } |
| } |
| return false; |
| } |
| |
| private static int buildVectorEncodingFlag(final VectorEncoding vectorEncoding) { |
| return FunctionQParser.FLAG_DEFAULT |
| | FunctionQParser.FLAG_CONSUME_DELIMITER |
| | (vectorEncoding.equals(VectorEncoding.BYTE) |
| ? FunctionQParser.FLAG_PARSE_VECTOR_BYTE_ENCODING |
| : 0); |
| } |
| |
| /** Expects to find args #3 and #4 (two vector ValueSources) still in the function parser */ |
| private ValueSource handle4ArgsVariant(FunctionQParser fp, String vecEncStr, String vecSimFuncStr) |
| throws SyntaxError { |
| final var vectorEncoding = enumValueOrBadRequest(VectorEncoding.class, vecEncStr); |
| final var vectorSimilarityFunction = |
| enumValueOrBadRequest(VectorSimilarityFunction.class, vecSimFuncStr); |
| final int vectorEncodingFlag = buildVectorEncodingFlag(vectorEncoding); |
| final ValueSource v1 = fp.parseValueSource(vectorEncodingFlag); |
| final ValueSource v2 = fp.parseValueSource(vectorEncodingFlag); |
| return createSimilarityFunction(vectorSimilarityFunction, vectorEncoding, v1, v2); |
| } |
| |
| /** |
| * If <code>field2Name</code> is null, then expects to find a constant vector as the only |
| * remaining arg in the function parser. |
| */ |
| private ValueSource handle2ArgsVariant(FunctionQParser fp, String field1Name, String field2Name) |
| throws SyntaxError { |
| |
| final SchemaField field1 = fp.req.getSchema().getField(field1Name); |
| final DenseVectorField field1Type = requireVectorType(field1); |
| |
| final var vectorEncoding = field1Type.getVectorEncoding(); |
| final var vectorSimilarityFunction = field1Type.getSimilarityFunction(); |
| |
| final ValueSource v1 = field1Type.getValueSource(field1, fp); |
| final ValueSource v2; |
| |
| if (null == field2Name) { |
| final int vectorEncodingFlag = buildVectorEncodingFlag(vectorEncoding); |
| v2 = fp.parseValueSource(vectorEncodingFlag); |
| |
| } else { |
| final SchemaField field2 = fp.req.getSchema().getField(field2Name); |
| final DenseVectorField field2Type = requireVectorType(field2); |
| if (vectorEncoding != field2Type.getVectorEncoding() |
| || vectorSimilarityFunction != field2Type.getSimilarityFunction()) { |
| throw new SolrException( |
| BAD_REQUEST, |
| String.format( |
| Locale.ROOT, |
| "Invalid arguments: vector field %s and vector field %s must have the same vectorEncoding and similarityFunction", |
| field1.getName(), |
| field2.getName())); |
| } |
| v2 = field2Type.getValueSource(field2, fp); |
| } |
| return createSimilarityFunction(vectorSimilarityFunction, vectorEncoding, v1, v2); |
| } |
| |
| private ValueSource createSimilarityFunction( |
| VectorSimilarityFunction functionName, |
| VectorEncoding vectorEncoding, |
| ValueSource v1, |
| ValueSource v2) |
| throws SyntaxError { |
| switch (vectorEncoding) { |
| case FLOAT32: |
| return new FloatVectorSimilarityFunction(functionName, v1, v2); |
| case BYTE: |
| return new ByteVectorSimilarityFunction(functionName, v1, v2); |
| default: |
| throw new SyntaxError("Invalid vector encoding: " + vectorEncoding); |
| } |
| } |
| |
| private DenseVectorField requireVectorType(final SchemaField field) throws SyntaxError { |
| final FieldType fieldType = field.getType(); |
| if (fieldType instanceof DenseVectorField) { |
| return (DenseVectorField) field.getType(); |
| } |
| throw new SolrException( |
| BAD_REQUEST, |
| String.format( |
| Locale.ROOT, |
| "Type mismatch: Expected [%s], but found a different field type for field: [%s]", |
| DenseVectorField.class.getSimpleName(), |
| field.getName())); |
| } |
| |
| /** |
| * Helper method that returns the correct Enum instance for the <code>arg</code> String, or throws |
| * a {@link ErrorCode#BAD_REQUEST} with specifics on the "Invalid argument" |
| */ |
| private static <T extends Enum<T>> T enumValueOrBadRequest( |
| final Class<T> enumClass, final String arg) throws SolrException { |
| assert null != enumClass; |
| try { |
| return Enum.valueOf(enumClass, arg); |
| } catch (IllegalArgumentException | NullPointerException e) { |
| throw new SolrException( |
| BAD_REQUEST, |
| String.format( |
| Locale.ROOT, |
| "Invalid argument: %s is not a valid %s. Expected one of %s", |
| arg, |
| enumClass.getSimpleName(), |
| Arrays.toString(enumClass.getEnumConstants()))); |
| } |
| } |
| } |