/*
 * 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.vxquery.runtime.functions.bool;

import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
import org.apache.hyracks.api.context.IHyracksTaskContext;
import org.apache.hyracks.api.exceptions.HyracksDataException;
import org.apache.hyracks.data.std.api.IPointable;
import org.apache.hyracks.data.std.primitive.BooleanPointable;
import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
import org.apache.vxquery.datamodel.accessors.TaggedValuePointable;
import org.apache.vxquery.datamodel.values.XDMConstants;
import org.apache.vxquery.runtime.functions.base.AbstractTaggedValueArgumentScalarEvaluatorFactory;

public class OrScalarEvaluatorFactory extends AbstractTaggedValueArgumentScalarEvaluatorFactory {
    private static final long serialVersionUID = 1L;

    public OrScalarEvaluatorFactory(IScalarEvaluatorFactory[] args) {
        super(args);
    }

    @Override
    protected IScalarEvaluator createEvaluator(IHyracksTaskContext ctx, IScalarEvaluator[] args)
            throws HyracksDataException {
        return new OrScalarEvaluator(args);
    }

    private static class OrScalarEvaluator implements IScalarEvaluator {
        private final IScalarEvaluator[] args;

        private final BooleanPointable bp = (BooleanPointable) BooleanPointable.FACTORY.createPointable();

        private final TaggedValuePointable tvp = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable();

        public OrScalarEvaluator(IScalarEvaluator[] args) {
            this.args = args;
        }

        @Override
        public final void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
            for (int i = 0; i < args.length; ++i) {
                args[i].evaluate(tuple, tvp);
                tvp.getValue(bp);
                if (bp.getBoolean()) {
                    XDMConstants.setTrue(result);
                    return;
                }
            }
            XDMConstants.setFalse(result);
        }
    }
}