/*
 * Copyright 2009-2010 by The Regents of the University of California
 * Licensed 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 from
 * 
 *     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 edu.uci.ics.hyracks.dataflow.common.util;

import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits;
import edu.uci.ics.hyracks.data.std.accessors.PointableBinaryComparatorFactory;
import edu.uci.ics.hyracks.data.std.primitive.BooleanPointable;
import edu.uci.ics.hyracks.data.std.primitive.DoublePointable;
import edu.uci.ics.hyracks.data.std.primitive.FloatPointable;
import edu.uci.ics.hyracks.data.std.primitive.IntegerPointable;
import edu.uci.ics.hyracks.data.std.primitive.LongPointable;
import edu.uci.ics.hyracks.data.std.primitive.ShortPointable;
import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable;
import edu.uci.ics.hyracks.dataflow.common.data.marshalling.BooleanSerializerDeserializer;
import edu.uci.ics.hyracks.dataflow.common.data.marshalling.DoubleSerializerDeserializer;
import edu.uci.ics.hyracks.dataflow.common.data.marshalling.FloatSerializerDeserializer;
import edu.uci.ics.hyracks.dataflow.common.data.marshalling.Integer64SerializerDeserializer;
import edu.uci.ics.hyracks.dataflow.common.data.marshalling.IntegerSerializerDeserializer;
import edu.uci.ics.hyracks.dataflow.common.data.marshalling.ShortSerializerDeserializer;
import edu.uci.ics.hyracks.dataflow.common.data.marshalling.UTF8StringSerializerDeserializer;

@SuppressWarnings("rawtypes")
public class SerdeUtils {
    public static class PayloadTypeTraits implements ITypeTraits {
        private static final long serialVersionUID = 1L;
        final int payloadSize;

        public PayloadTypeTraits(int payloadSize) {
            this.payloadSize = payloadSize;
        }

        @Override
        public boolean isFixedLength() {
            return true;
        }

        @Override
        public int getFixedLength() {
            return payloadSize;
        }
    }

    public static ITypeTraits[] serdesToTypeTraits(ISerializerDeserializer[] serdes) {
        ITypeTraits[] typeTraits = new ITypeTraits[serdes.length];
        for (int i = 0; i < serdes.length; i++) {
            typeTraits[i] = serdeToTypeTrait(serdes[i]);
        }
        return typeTraits;
    }

    public static ITypeTraits[] serdesToTypeTraits(ISerializerDeserializer[] serdes, int payloadSize) {
        ITypeTraits[] typeTraits = new ITypeTraits[serdes.length + 1];
        for (int i = 0; i < serdes.length; i++) {
            typeTraits[i] = serdeToTypeTrait(serdes[i]);
        }
        typeTraits[serdes.length] = new PayloadTypeTraits(payloadSize);
        return typeTraits;
    }

    public static ITypeTraits serdeToTypeTrait(ISerializerDeserializer serde) {
        if (serde instanceof ShortSerializerDeserializer) {
            return ShortPointable.TYPE_TRAITS;
        }
        if (serde instanceof IntegerSerializerDeserializer) {
            return IntegerPointable.TYPE_TRAITS;
        }
        if (serde instanceof Integer64SerializerDeserializer) {
            return LongPointable.TYPE_TRAITS;
        }
        if (serde instanceof FloatSerializerDeserializer) {
            return FloatPointable.TYPE_TRAITS;
        }
        if (serde instanceof DoubleSerializerDeserializer) {
            return DoublePointable.TYPE_TRAITS;
        }
        if (serde instanceof BooleanSerializerDeserializer) {
            return BooleanPointable.TYPE_TRAITS;
        }
        return UTF8StringPointable.TYPE_TRAITS;
    }

    public static IBinaryComparator[] serdesToComparators(ISerializerDeserializer[] serdes, int numSerdes) {
        IBinaryComparator[] comparators = new IBinaryComparator[numSerdes];
        for (int i = 0; i < numSerdes; i++) {
            comparators[i] = serdeToComparator(serdes[i]);
        }
        return comparators;
    }

    public static IBinaryComparator serdeToComparator(ISerializerDeserializer serde) {
        IBinaryComparatorFactory f = serdeToComparatorFactory(serde);
        return f.createBinaryComparator();
    }

    public static IBinaryComparatorFactory[] serdesToComparatorFactories(ISerializerDeserializer[] serdes, int numSerdes) {
        IBinaryComparatorFactory[] comparatorsFactories = new IBinaryComparatorFactory[numSerdes];
        for (int i = 0; i < numSerdes; i++) {
            comparatorsFactories[i] = serdeToComparatorFactory(serdes[i]);
        }
        return comparatorsFactories;
    }

    public static IBinaryComparatorFactory serdeToComparatorFactory(ISerializerDeserializer serde) {
        if (serde instanceof ShortSerializerDeserializer) {
            return PointableBinaryComparatorFactory.of(ShortPointable.FACTORY);
        }
        if (serde instanceof IntegerSerializerDeserializer) {
            return PointableBinaryComparatorFactory.of(IntegerPointable.FACTORY);
        }
        if (serde instanceof Integer64SerializerDeserializer) {
            return PointableBinaryComparatorFactory.of(LongPointable.FACTORY);
        }
        if (serde instanceof FloatSerializerDeserializer) {
            return PointableBinaryComparatorFactory.of(FloatPointable.FACTORY);
        }
        if (serde instanceof DoubleSerializerDeserializer) {
            return PointableBinaryComparatorFactory.of(DoublePointable.FACTORY);
        }
        if (serde instanceof BooleanSerializerDeserializer) {
            throw new UnsupportedOperationException("Binary comparator factory for Boolean not implemented.");
        }
        if (serde instanceof UTF8StringSerializerDeserializer) {
            return PointableBinaryComparatorFactory.of(UTF8StringPointable.FACTORY);
        }
        throw new UnsupportedOperationException("Binary comparator for + " + serde.toString() + " not implemented.");
    }
}