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ElasticsearchAiSearchFilterExpressionConverter.java
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ElasticsearchAiSearchFilterExpressionConverter.java
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/*
* Copyright 2023 - 2024 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.ai.vectorstore;
import org.springframework.ai.vectorstore.filter.Filter;
import org.springframework.ai.vectorstore.filter.Filter.Expression;
import org.springframework.ai.vectorstore.filter.Filter.Key;
import org.springframework.ai.vectorstore.filter.converter.AbstractFilterExpressionConverter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;
import java.util.regex.Pattern;
/**
* @author Jemin Huh
* @since 1.0.0
*/
public class ElasticsearchAiSearchFilterExpressionConverter extends AbstractFilterExpressionConverter {
private static final Pattern DATE_FORMAT_PATTERN = Pattern.compile("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}Z");
private final SimpleDateFormat dateFormat;
public ElasticsearchAiSearchFilterExpressionConverter() {
this.dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
this.dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
}
@Override
protected void doExpression(Expression expression, StringBuilder context) {
if (expression.type() == Filter.ExpressionType.IN || expression.type() == Filter.ExpressionType.NIN) {
context.append(getOperationSymbol(expression));
context.append("(");
this.convertOperand(expression.left(), context);
this.convertOperand(expression.right(), context);
context.append(")");
}
else {
this.convertOperand(expression.left(), context);
context.append(getOperationSymbol(expression));
this.convertOperand(expression.right(), context);
}
}
@Override
protected void doStartValueRange(Filter.Value listValue, StringBuilder context) {
}
@Override
protected void doEndValueRange(Filter.Value listValue, StringBuilder context) {
}
@Override
protected void doAddValueRangeSpitter(Filter.Value listValue, StringBuilder context) {
context.append(" OR ");
}
private String getOperationSymbol(Expression exp) {
return switch (exp.type()) {
case AND -> " AND ";
case OR -> " OR ";
case EQ, IN -> "";
case NE -> " NOT ";
case LT -> "<";
case LTE -> "<=";
case GT -> ">";
case GTE -> ">=";
case NIN -> "NOT ";
default -> throw new RuntimeException("Not supported expression type: " + exp.type());
};
}
@Override
public void doKey(Key key, StringBuilder context) {
var identifier = hasOuterQuotes(key.key()) ? removeOuterQuotes(key.key()) : key.key();
var prefixedIdentifier = withMetaPrefix(identifier);
context.append(prefixedIdentifier.trim()).append(":");
}
public String withMetaPrefix(String identifier) {
return "metadata." + identifier;
}
@Override
protected void doValue(Filter.Value filterValue, StringBuilder context) {
if (filterValue.value() instanceof List list) {
int c = 0;
for (Object v : list) {
context.append(v);
if (c++ < list.size() - 1) {
this.doAddValueRangeSpitter(filterValue, context);
}
}
}
else {
this.doSingleValue(filterValue.value(), context);
}
}
@Override
protected void doSingleValue(Object value, StringBuilder context) {
if (value instanceof Date date) {
context.append(this.dateFormat.format(date));
}
else if (value instanceof String text) {
if (DATE_FORMAT_PATTERN.matcher(text).matches()) {
try {
Date date = this.dateFormat.parse(text);
context.append(this.dateFormat.format(date));
}
catch (ParseException e) {
throw new IllegalArgumentException("Invalid date type:" + text, e);
}
}
else {
context.append(text);
}
}
else {
context.append(value);
}
}
@Override
public void doStartGroup(Filter.Group group, StringBuilder context) {
context.append("(");
}
@Override
public void doEndGroup(Filter.Group group, StringBuilder context) {
context.append(")");
}
}