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Interpreter.java
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Interpreter.java
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package com.dbms;
import com.dbms.queryplan.LogicalPlanBuilder;
import com.dbms.queryplan.PhysicalPlanBuilder;
import com.dbms.utils.Catalog;
import java.io.BufferedReader;
import java.io.IOException;
import net.sf.jsqlparser.parser.CCJSqlParserUtil;
import net.sf.jsqlparser.statement.Statement;
/** Main entry point of the DBMS and the corresponding query runner */
public class Interpreter {
/** Executes a query and writes the output to the output file
*
* @param queryString is the query as a {@code String}
* @param queryNumber is the {@code queryNumber}th query in the queries.sql file. It helps with
* naming the output files to their corresponding line number in the
* queries.sql file. */
public static void executeQuery(String queryString, int queryNumber) {
Statement statement = null;
try {
statement = CCJSqlParserUtil.parse(queryString);
LogicalPlanBuilder logicalPlan = new LogicalPlanBuilder(statement);
PhysicalPlanBuilder ppb = new PhysicalPlanBuilder();
logicalPlan.root.accept(ppb);
ppb.physOp.dump(Catalog.pathToOutputFile(queryNumber));
logicalPlan.writePlan(queryNumber);
ppb.writePlan(queryNumber);
Catalog.cleanTempDir();
} catch (Exception e) {
System.out.println("Failure: " + statement);
e.printStackTrace();
}
}
/** Executes all queries in the catalog queries file and writes the output to the catalog output
* directory with ascending query number. If a query fails during the process, this prints the
* failed query and error message to the console, then continues to the next query.
*
* @throws IOException */
public static void run() throws IOException {
BufferedReader fileReader = Catalog.getQueriesFile();
int i = 1;
String currentQuery;
while ((currentQuery = fileReader.readLine()) != null) executeQuery(currentQuery, i++);
}
/** Initializes the catalog with the provided input and output paths, then runs the interpreter.
*
* @param args args[0] path to interpreter configuration file
* @throws IOException */
public static void main(String[] args) throws IOException {
Catalog.init(args[0]);
Catalog.serializeIndexes();
run();
}
}