/*
 * 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 tdb2;

import arq.cmdline.ModLangOutput;
import org.apache.jena.system.Txn;
import org.apache.jena.cmd.CmdException;
import org.apache.jena.riot.RDFDataMgr;
import org.apache.jena.riot.RDFFormat;
import org.apache.jena.riot.RDFLanguages;
import org.apache.jena.sparql.core.DatasetGraph;
import tdb2.cmdline.CmdTDB;

public class tdbdump extends CmdTDB {
    static ModLangOutput modLangOutput = new ModLangOutput();

    static public void main(String...argv) {
        CmdTDB.init();
        new tdbdump(argv).mainRun();
    }

    protected tdbdump(String[] argv) {
        super(argv);
        addModule(modLangOutput);
    }

    @Override
    protected String getSummary() {
        return getCommandName() + " : Write a dataset to stdout (defaults to N-Quads)";
    }

    @Override
    protected void exec() {
        DatasetGraph dsg = getDatasetGraph();
        // Prefer stream over fully pretty output formats.
        RDFFormat fmt = modLangOutput.getOutputStreamFormat();
        // Stream writing happens naturally - no need to call StreamRDFWriter.
        // if ( fmt != null && StreamRDFWriter.registered(fmt) )
        if ( fmt == null )
            fmt = modLangOutput.getOutputFormatted();
        if ( fmt == null )
            // Default.
            fmt = RDFFormat.NQUADS;
        if ( !RDFLanguages.isQuads(fmt.getLang()) )
            throw new CmdException("Databases can be dumped only in quad formats (e.g. Trig, N-Quads), not " + fmt.getLang());
        RDFFormat fmtFinal = fmt;
        Txn.executeRead(dsg, () -> RDFDataMgr.write(System.out, dsg, fmtFinal));
    }
}
