vxquery-core/src/main/java/org/apache/vxquery/runtime/functions/type/InstanceOfScalarEvaluatorFactory.java

/*
 * 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.type;

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.vxquery.datamodel.accessors.TaggedValuePointable;
import org.apache.vxquery.datamodel.values.XDMConstants;
import org.apache.vxquery.exceptions.SystemException;
import org.apache.vxquery.types.SequenceType;

public class InstanceOfScalarEvaluatorFactory extends AbstractTypeScalarEvaluatorFactory {
    private static final long serialVersionUID = 1L;

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

    @Override
    protected IScalarEvaluator createEvaluator(IHyracksTaskContext ctx, IScalarEvaluator[] args)
            throws HyracksDataException {
        return new AbstractTypeScalarEvaluator(args, ctx) {
            private final SequenceTypeMatcher matcher = new SequenceTypeMatcher();

            @Override
            protected void evaluate(TaggedValuePointable tvp, IPointable result) throws SystemException {
                boolean success = matcher.sequenceTypeMatch(tvp);
                if (success) {
                    XDMConstants.setTrue(result);
                } else {
                    XDMConstants.setFalse(result);
                }
            }

            @Override
            protected void setSequenceType(SequenceType sType) {
                matcher.setSequenceType(sType);
            }
        };
    }
}