/*
 * 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
 *
 *   https://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.
 *
 *   SPDX-License-Identifier: Apache-2.0
 */

package org.apache.jena.sparql.engine.iterator;

import org.apache.jena.atlas.io.IndentedWriter;
import org.apache.jena.graph.Node;
import org.apache.jena.sparql.core.Var;
import org.apache.jena.sparql.engine.ExecutionContext;
import org.apache.jena.sparql.engine.binding.Binding;
import org.apache.jena.sparql.engine.binding.BindingFactory;
import org.apache.jena.sparql.serializer.SerializationContext;

/** A singleton iterator */

public class QueryIterSingleton extends QueryIterYieldN {
    // A common usage?
    public static QueryIterSingleton create(Binding parent, Var var, Node value, ExecutionContext execCxt) {
        Binding b = BindingFactory.binding(parent, var, value);
        return QueryIterSingleton.create(b, execCxt);
    }

    public static QueryIterSingleton create(Binding binding, ExecutionContext execCxt) {
        return new QueryIterSingleton(binding, execCxt);
    }

    private QueryIterSingleton(Binding binding) // Not needed
    {
        this(binding, null);
    }

    protected QueryIterSingleton(Binding binding, ExecutionContext context) {
        super(1, binding, context);
    }

    @Override
    public void output(IndentedWriter out, SerializationContext sCxt) {
        out.print("QueryIterSingleton " + binding);
    }
}
