/*
 * 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.asterix.runtime.evaluators.functions.binary;

import org.apache.asterix.om.functions.BuiltinFunctions;
import org.apache.asterix.om.functions.IFunctionDescriptor;
import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
import org.apache.asterix.om.functions.IFunctionTypeInferer;
import org.apache.asterix.om.types.hierachy.ATypeHierarchy;
import org.apache.asterix.runtime.evaluators.functions.AbstractStringOffsetConfigurableDescriptor;
import org.apache.asterix.runtime.functions.FunctionTypeInferers;
import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
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.dataflow.common.data.accessors.IFrameTupleReference;

public class SubBinaryFromToDescriptor extends AbstractStringOffsetConfigurableDescriptor {
    private static final long serialVersionUID = 1L;
    public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() {
        @Override
        public IFunctionDescriptor createFunctionDescriptor() {
            return new SubBinaryFromToDescriptor();
        }

        @Override
        public IFunctionTypeInferer createFunctionTypeInferer() {
            return FunctionTypeInferers.SET_STRING_OFFSET;
        }
    };

    @Override
    public FunctionIdentifier getIdentifier() {
        return BuiltinFunctions.SUBBINARY_FROM_TO;
    }

    @Override
    public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
        return new IScalarEvaluatorFactory() {
            private static final long serialVersionUID = 1L;

            private final int baseOffset = stringOffset;

            @Override
            public IScalarEvaluator createScalarEvaluator(final IHyracksTaskContext ctx) throws HyracksDataException {

                return new AbstractSubBinaryEvaluator(ctx, args, baseOffset, getIdentifier().getName(), sourceLoc) {
                    @Override
                    protected int getSubLength(IFrameTupleReference tuple) throws HyracksDataException {
                        return ATypeHierarchy.getIntegerValue(getIdentifier().getName(), 2,
                                pointables[2].getByteArray(), pointables[2].getStartOffset());
                    }
                };
            }
        };
    }
}
