/*
* Copyright Aduna (http://www.aduna-software.com/) (c) 1997-2007.
*
* Licensed under the Aduna BSD-style license.
*/
package org.openrdf.query.parser.serql;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Map;
import org.openrdf.model.impl.ValueFactoryImpl;
import org.openrdf.query.MalformedQueryException;
import org.openrdf.query.algebra.QueryModel;
import org.openrdf.query.algebra.TupleExpr;
import org.openrdf.query.parser.GraphQueryModel;
import org.openrdf.query.parser.QueryParser;
import org.openrdf.query.parser.TupleQueryModel;
import org.openrdf.query.parser.serql.ast.ASTGraphQuery;
import org.openrdf.query.parser.serql.ast.ASTQuery;
import org.openrdf.query.parser.serql.ast.ASTQueryContainer;
import org.openrdf.query.parser.serql.ast.ASTTupleQuery;
import org.openrdf.query.parser.serql.ast.ParseException;
import org.openrdf.query.parser.serql.ast.SyntaxTreeBuilder;
import org.openrdf.query.parser.serql.ast.TokenMgrError;
import org.openrdf.query.parser.serql.ast.VisitorException;
public class SeRQLParser implements QueryParser {
public QueryModel parseQuery(String queryStr, String baseURI)
throws MalformedQueryException
{
try {
ASTQueryContainer qc = SyntaxTreeBuilder.parseQuery(queryStr);
// Replace deprecated NULL nodes with semantically equivalent
// alternatives
NullProcessor.process(qc);
StringEscapesProcessor.process(qc);
Map<String, String> namespaces = NamespaceDeclProcessor.process(qc);
ProjectionProcessor.process(qc);
qc.jjtAccept(new ProjectionAliasProcessor(), null);
qc.jjtAccept(new AnonymousVarGenerator(), null);
// TODO: check use of unbound variables?
TupleExpr tupleExpr = QueryModelBuilder.buildQueryModel(qc, new ValueFactoryImpl());
ASTQuery queryNode = qc.getQuery();
QueryModel query;
if (queryNode instanceof ASTTupleQuery) {
query = new TupleQueryModel(tupleExpr);
}
else if (queryNode instanceof ASTGraphQuery) {
query = new GraphQueryModel(tupleExpr, namespaces);
}
else {
throw new RuntimeException("Unexpected query type: " + queryNode.getClass());
}
return query;
}
catch (ParseException e) {
throw new MalformedQueryException(e.getMessage(), e);
}
catch (TokenMgrError e) {
throw new MalformedQueryException(e.getMessage(), e);
}
catch (VisitorException e) {
throw new MalformedQueryException(e.getMessage(), e);
}
}
public static void main(String[] args)
throws java.io.IOException
{
System.out.println("Your SeRQL query:");
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
StringBuilder buf = new StringBuilder();
String line = null;
while ((line = in.readLine()) != null) {
if (line.length() > 0) {
buf.append(' ').append(line).append('\n');
}
else {
String queryStr = buf.toString().trim();
if (queryStr.length() > 0) {
try {
SeRQLParser parser = new SeRQLParser();
parser.parseQuery(queryStr, null);
}
catch (Exception e) {
System.err.println(e.getMessage());
e.printStackTrace();
}
}
buf.setLength(0);
}
}
}
}