/*
 * 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.sparql.sse.builders;

import org.apache.jena.sparql.algebra.Op;
import org.apache.jena.sparql.core.DatasetGraph;
import org.apache.jena.sparql.resultset.ResultsFormat;
import org.apache.jena.sparql.sse.Item;
import org.apache.jena.sparql.sse.ItemList;
import org.apache.jena.sparql.sse.Tags;
import org.apache.jena.sparql.util.QueryExecUtils;

public class BuilderExec {

    static public void exec(Item item) {
        if ( item.isNode() )
            BuilderLib.broken(item, "Attempt to build evaluation from a plain node");

        if ( item.isSymbol() )
            BuilderLib.broken(item, "Attempt to build evaluation from a bare symbol");

        if ( !item.isTagged(Tags.tagExec) )
            throw new SSE_BuildException("Wanted (" + Tags.tagExec + "...) : got: " + item.shortString());

        ItemList list = item.getList();
        BuilderLib.checkLength(3, list, item.shortString() + " does not have 2 components");

        DatasetGraph dsg = BuilderGraph.buildDataset(list.get(1));
        Op op = BuilderOp.build(list.get(2));
        QueryExecUtils.execute(op, dsg, ResultsFormat.FMT_TEXT);
    }
}
