/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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 arq.cmdline;
import jena.cmd.ArgDecl;
import jena.cmd.CmdArgModule;
import jena.cmd.CmdGeneral;
import jena.cmd.ModBase;
import org.apache.jena.sparql.algebra.Op ;
import org.apache.jena.sparql.sse.SSE ;
import org.apache.jena.util.FileManager ;
public class ModAlgebra extends ModBase
{
protected final ArgDecl queryFileDecl = new ArgDecl(ArgDecl.HasValue, "query", "file") ;
private String queryFilename = null ;
private String queryString = null ;
private Op op = null ;
@Override
public void registerWith(CmdGeneral cmdLine)
{
cmdLine.getUsage().startCategory("Query") ;
cmdLine.add(queryFileDecl,
"--query, --file",
"File containing an algebra query") ;
}
@Override
public void processArgs(CmdArgModule cmdLine)
{
if ( cmdLine.contains(queryFileDecl) )
{
queryFilename = cmdLine.getValue(queryFileDecl) ;
queryString = FileManager.get().readWholeFileAsUTF8(queryFilename) ;
}
if ( cmdLine.getNumPositional() == 0 && queryFilename == null )
cmdLine.cmdError("No query string or query file") ;
if ( cmdLine.getNumPositional() > 1 )
cmdLine.cmdError("Only one query string allowed") ;
if ( cmdLine.getNumPositional() == 1 && queryFilename != null )
cmdLine.cmdError("Either query string or query file - not both") ;
if ( queryFilename == null )
{
String qs = cmdLine.getPositionalArg(0) ;
queryString = cmdLine.indirect(qs) ;
}
}
public Op getOp()
{
if ( op != null )
return op ;
op = SSE.parseOp(queryString) ;
if ( op == null )
System.err.println("Failed to parse : "+queryString) ;
return op ;
}
}