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Add Apache Spark converter module #93

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65 changes: 65 additions & 0 deletions converters/spark/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>org.osi</groupId>
<artifactId>osi-spark-converter</artifactId>
<version>0.1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<name>OSI Spark Converter</name>
<description>Converts OSI semantic models to Apache Spark code</description>

<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spark.version>3.5.1</spark.version>
<snakeyaml.version>2.2</snakeyaml.version>
<junit.version>5.10.2</junit.version>
</properties>

<dependencies>
<!-- YAML parsing -->
<dependency>
<groupId>org.yaml</groupId>
<artifactId>snakeyaml</artifactId>
<version>${snakeyaml.version}</version>
</dependency>

<!-- Apache Spark (provided — the generated code runs on a Spark cluster) -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.13</artifactId>
<version>${spark.version}</version>
<scope>provided</scope>
</dependency>

<!-- Test -->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.3.0</version>
<configuration>
<archive>
<manifest>
<mainClass>org.osi.converter.spark.OsiSparkConverter</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
180 changes: 180 additions & 0 deletions converters/spark/src/main/java/org/osi/converter/spark/OsiModelParser.java
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package org.osi.converter.spark;

import org.osi.converter.spark.model.OsiModel;
import org.osi.converter.spark.model.OsiModel.*;
import org.yaml.snakeyaml.Yaml;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;


/**
* Parses an OSI YAML file into an {@link OsiModel}.
*/
public class OsiModelParser {

/**
* Parse an OSI YAML file from the given path.
*/
public OsiModel parse(Path yamlPath) throws IOException {
try (InputStream is = Files.newInputStream(yamlPath)) {
return parse(is);
}
}

/**
* Parse an OSI YAML file from an input stream.
*/
@SuppressWarnings("unchecked")
public OsiModel parse(InputStream is) {
Yaml yaml = new Yaml();
Map<String, Object> root = yaml.load(is);

OsiModel model = new OsiModel();
model.setVersion((String) root.get("version"));

List<Map<String, Object>> smList = (List<Map<String, Object>>) root.get("semantic_model");
if (smList == null) {
return model;
}

List<SemanticModel> semanticModels = new ArrayList<>();
for (Map<String, Object> smMap : smList) {
semanticModels.add(parseSemanticModel(smMap));
}
model.setSemanticModels(semanticModels);
return model;
}

@SuppressWarnings("unchecked")
private SemanticModel parseSemanticModel(Map<String, Object> map) {
SemanticModel sm = new SemanticModel();
sm.setName((String) map.get("name"));
sm.setDescription((String) map.get("description"));

// Datasets
List<Map<String, Object>> dsList = (List<Map<String, Object>>) map.get("datasets");
if (dsList != null) {
List<Dataset> datasets = new ArrayList<>();
for (Map<String, Object> dsMap : dsList) {
datasets.add(parseDataset(dsMap));
}
sm.setDatasets(datasets);
}

// Relationships
List<Map<String, Object>> relList = (List<Map<String, Object>>) map.get("relationships");
if (relList != null) {
List<Relationship> relationships = new ArrayList<>();
for (Map<String, Object> relMap : relList) {
relationships.add(parseRelationship(relMap));
}
sm.setRelationships(relationships);
}

// Metrics
List<Map<String, Object>> metricList = (List<Map<String, Object>>) map.get("metrics");
if (metricList != null) {
List<Metric> metrics = new ArrayList<>();
for (Map<String, Object> mMap : metricList) {
metrics.add(parseMetric(mMap));
}
sm.setMetrics(metrics);
}

return sm;
}

@SuppressWarnings("unchecked")
private Dataset parseDataset(Map<String, Object> map) {
Dataset ds = new Dataset();
ds.setName((String) map.get("name"));
ds.setSource((String) map.get("source"));
ds.setDescription((String) map.get("description"));

List<String> pk = (List<String>) map.get("primary_key");
if (pk != null) {
ds.setPrimaryKey(new ArrayList<>(pk));
}

List<Map<String, Object>> fieldList = (List<Map<String, Object>>) map.get("fields");
if (fieldList != null) {
List<Field> fields = new ArrayList<>();
for (Map<String, Object> fMap : fieldList) {
fields.add(parseField(fMap));
}
ds.setFields(fields);
}
return ds;
}

@SuppressWarnings("unchecked")
private Field parseField(Map<String, Object> map) {
Field field = new Field();
field.setName((String) map.get("name"));
field.setDescription((String) map.get("description"));

// Dimension
Map<String, Object> dim = (Map<String, Object>) map.get("dimension");
if (dim != null) {
Object isTime = dim.get("is_time");
field.setTime(Boolean.TRUE.equals(isTime));
}

// Expressions
field.setExpressions(parseDialectExpressions(map));
return field;
}

@SuppressWarnings("unchecked")
private Relationship parseRelationship(Map<String, Object> map) {
Relationship rel = new Relationship();
rel.setName((String) map.get("name"));
rel.setFrom((String) map.get("from"));
rel.setTo((String) map.get("to"));

List<String> fromCols = (List<String>) map.get("from_columns");
if (fromCols != null) {
rel.setFromColumns(new ArrayList<>(fromCols));
}
List<String> toCols = (List<String>) map.get("to_columns");
if (toCols != null) {
rel.setToColumns(new ArrayList<>(toCols));
}
return rel;
}

@SuppressWarnings("unchecked")
private Metric parseMetric(Map<String, Object> map) {
Metric metric = new Metric();
metric.setName((String) map.get("name"));
metric.setDescription((String) map.get("description"));
metric.setExpressions(parseDialectExpressions(map));
return metric;
}

@SuppressWarnings("unchecked")
private List<DialectExpression> parseDialectExpressions(Map<String, Object> map) {
List<DialectExpression> result = new ArrayList<>();
Map<String, Object> exprBlock = (Map<String, Object>) map.get("expression");
if (exprBlock == null) {
return result;
}
List<Map<String, Object>> dialects = (List<Map<String, Object>>) exprBlock.get("dialects");
if (dialects == null) {
return result;
}
for (Map<String, Object> d : dialects) {
String dialect = (String) d.get("dialect");
Object exprValue = d.get("expression");
String expression = exprValue != null ? exprValue.toString() : null;
result.add(new DialectExpression(dialect, expression));
}
return result;
}
}
71 changes: 71 additions & 0 deletions converters/spark/src/main/java/org/osi/converter/spark/OsiSparkConverter.java
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package org.osi.converter.spark;

import org.osi.converter.spark.model.OsiModel;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;

/**
* CLI entry point: reads an OSI YAML semantic model and generates PySpark code.
*
* <pre>
* Usage:
* java -jar osi-spark-converter.jar &lt;osi_model.yaml&gt; [-o output.py] [-d DIALECT]
* </pre>
*/
public class OsiSparkConverter {

public static void main(String[] args) throws IOException {
if (args.length < 1) {
System.err.println("Usage: osi-spark-converter <osi_model.yaml> [-o output.py] [-d DIALECT]");
System.err.println();
System.err.println("Options:");
System.err.println(" -o FILE Write generated PySpark code to FILE (default: stdout)");
System.err.println(" -d DIALECT Preferred SQL dialect: ANSI_SQL, SNOWFLAKE, DATABRICKS (default: ANSI_SQL)");
System.exit(1);
}

String inputFile = args[0];
String outputFile = null;
String dialect = "ANSI_SQL";

for (int i = 1; i < args.length; i++) {
switch (args[i]) {
case "-o":
if (i + 1 < args.length) {
outputFile = args[++i];
}
break;
case "-d":
if (i + 1 < args.length) {
dialect = args[++i];
}
break;
default:
break;
}
}

// Parse the OSI model
OsiModelParser parser = new OsiModelParser();
OsiModel model = parser.parse(Paths.get(inputFile));

if (model.getSemanticModels().isEmpty()) {
System.err.println("Error: no semantic_model found in " + inputFile);
System.exit(1);
}

// Generate PySpark code
SparkCodeGenerator generator = new SparkCodeGenerator(dialect);
String code = generator.generate(model);

if (outputFile != null) {
Files.write(Paths.get(outputFile), code.getBytes(StandardCharsets.UTF_8));
System.out.println("Generated PySpark code written to " + outputFile);
} else {
System.out.println(code);
}
}
}
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