org.voltdb.compiler.statements.VoltDBStatementProcessor Maven / Gradle / Ivy
/* This file is part of VoltDB.
* Copyright (C) 2008-2020 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see .
*/
package org.voltdb.compiler.statements;
import java.util.regex.Matcher;
import org.voltdb.catalog.Database;
import org.voltdb.compiler.DDLCompiler;
import org.voltdb.compiler.DDLCompiler.DDLStatement;
import org.voltdb.compiler.DDLCompiler.StatementProcessor;
import org.voltdb.compiler.VoltCompiler.DdlProceduresToLoad;
import org.voltdb.compiler.VoltCompiler.VoltCompilerException;
import org.voltdb.parser.SQLParser;
/**
* Check if a statement is VoltDB-specific.
* If it is, then hand it over to the subsequent processors to handle.
* If not, end the chain now and give it to HSQL for handling.
*/
public class VoltDBStatementProcessor extends StatementProcessor {
public VoltDBStatementProcessor(DDLCompiler ddlCompiler) {
super(ddlCompiler);
}
private String m_commandPrefix;
public String getCommandPrefix() {
return m_commandPrefix;
}
@Override
protected boolean processStatement(DDLStatement ddlStatement, Database db, DdlProceduresToLoad whichProcs)
throws VoltCompilerException {
if (ddlStatement.statement == null || ddlStatement.statement.trim().isEmpty()) {
m_returnAfterThis = true;
return false;
}
ddlStatement.statement = ddlStatement.statement.trim();
// Matches if it is the beginning of a VoltDB statement
Matcher statementMatcher = SQLParser.matchAllVoltDBStatementPreambles(ddlStatement.statement);
if ( ! statementMatcher.find()) {
m_returnAfterThis = true;
return false;
}
// Either PROCEDURE, FUNCTION, REPLICATE, PARTITION, ROLE, EXPORT, DR OR AGGREGATE
m_commandPrefix = statementMatcher.group(1).toUpperCase();
return false;
}
}