| /** |
| * 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 org.apache.jena.riot.thrift; |
| |
| import java.io.BufferedInputStream ; |
| import java.io.BufferedOutputStream ; |
| import java.io.InputStream ; |
| import java.io.OutputStream ; |
| |
| import org.apache.jena.atlas.io.IO ; |
| import org.apache.jena.atlas.logging.Log ; |
| import org.apache.jena.riot.RiotException ; |
| import org.apache.jena.riot.system.StreamRDF ; |
| import org.apache.jena.riot.thrift.wire.RDF_ANY ; |
| import org.apache.jena.riot.thrift.wire.RDF_StreamRow ; |
| import org.apache.jena.riot.thrift.wire.RDF_Term ; |
| import org.apache.jena.riot.thrift.wire.RDF_UNDEF ; |
| import org.apache.thrift.TException ; |
| import org.apache.thrift.protocol.TCompactProtocol ; |
| import org.apache.thrift.protocol.TJSONProtocol ; |
| import org.apache.thrift.protocol.TProtocol ; |
| import org.apache.thrift.protocol.TTupleProtocol ; |
| import org.apache.thrift.transport.TIOStreamTransport ; |
| import org.apache.thrift.transport.TTransport ; |
| |
| /** Support operations for RDF Thrift */ |
| public class TRDF { |
| public static final int InputBufferSize = 128*1024 ; |
| public static final int OutputBufferSize = 128*1024 ; |
| |
| /** |
| * Create Thrift protocol for the InputStream. |
| * @param in InputStream |
| */ |
| public static TProtocol protocol(InputStream in) { |
| try { |
| if ( ! ( in instanceof BufferedInputStream ) ) |
| in = new BufferedInputStream(in, InputBufferSize) ; |
| TTransport transport = new TIOStreamTransport(in) ; |
| transport.open() ; |
| TProtocol protocol = protocol(transport) ; |
| return protocol ; |
| } catch (TException ex) { TRDF.exception(ex) ; return null ; } |
| } |
| |
| /** |
| * Create Thrift protocol for the OutputStream. |
| * The caller must call {@link TRDF#flush(TProtocol)} |
| * which will flush the underlying (internally buffered) output stream. |
| * @param out OutputStream |
| */ |
| public static TProtocol protocol(OutputStream out) { |
| try { |
| // Flushing the protocol will flush the BufferedOutputStream |
| if ( !( out instanceof BufferedOutputStream ) ) |
| out = new BufferedOutputStream(out, OutputBufferSize) ; |
| TTransport transport = new TIOStreamTransport(out) ; |
| transport.open() ; |
| TProtocol protocol = protocol(transport) ; |
| return protocol ; |
| } catch (TException ex) { TRDF.exception(ex) ; return null ; } |
| } |
| |
| /** |
| * Decode the contents of the input stream and send to the {@link StreamRDF}. |
| * @param filename |
| */ |
| public static TProtocol protocol(String filename) { |
| InputStream in = IO.openFile(filename) ; |
| TProtocol protocol = protocol(in) ; |
| return protocol ; |
| } |
| |
| public static TProtocol protocol(TTransport transport) { |
| if ( true ) return new TCompactProtocol(transport) ; |
| |
| // Keep the warnings down. |
| if ( false ) return new TTupleProtocol(transport) ; |
| if ( false ) return new TJSONProtocol(transport) ; |
| throw new RiotThriftException("No protocol impl choosen") ; |
| } |
| |
| /** Flush a TProtocol; exceptions converted to {@link RiotException} */ |
| public static void flush(TProtocol protocol) { |
| flush(protocol.getTransport()) ; |
| } |
| |
| /** Flush a TTransport; exceptions converted to {@link RiotException} */ |
| public static void flush(TTransport transport) { |
| try { transport.flush() ; } |
| catch (TException ex) { TRDF.exception(ex) ; } |
| } |
| |
| public static final RDF_ANY ANY = new RDF_ANY() ; |
| /** The Thrift RDF Term 'ANY' */ |
| public static final RDF_Term tANY = new RDF_Term() ; |
| /** The Thrift RDF Term 'UNDEF' */ |
| public static final RDF_UNDEF UNDEF = new RDF_UNDEF() ; |
| public static final RDF_Term tUNDEF = new RDF_Term(); |
| |
| static { tANY.setAny(new RDF_ANY()) ; } |
| |
| static { tUNDEF.setUndefined(new RDF_UNDEF()) ; } |
| |
| public static void visit(RDF_StreamRow row, VisitorStreamRowTRDF visitor) { |
| if ( row.isSetTriple() ) { |
| visitor.visit(row.getTriple()) ; |
| } else if ( row.isSetQuad() ) { |
| visitor.visit(row.getQuad()) ; |
| } else if ( row.isSetPrefixDecl() ) { |
| visitor.visit(row.getPrefixDecl()) ; |
| } else { |
| Log.warn(ThriftConvert.class, "visit: Unrecognized: "+row) ; |
| } |
| } |
| |
| public static void exception(TException ex) { throw new RiotThriftException(ex) ; } |
| |
| } |
| |