com.netflix.hollow.core.write.HollowWriteStateEnginePrimaryKeyHasher Maven / Gradle / Ivy

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/*
 *  Copyright 2016-2019 Netflix, Inc.
 *
 *     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 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 com.netflix.hollow.core.write;

import com.netflix.hollow.core.index.key.PrimaryKey;
import com.netflix.hollow.core.memory.ByteArrayOrdinalMap;
import com.netflix.hollow.core.memory.SegmentedByteArray;
import com.netflix.hollow.core.memory.encoding.HashCodes;
import com.netflix.hollow.core.memory.encoding.VarInt;
import com.netflix.hollow.core.memory.encoding.ZigZag;
import com.netflix.hollow.core.schema.HollowObjectSchema;

class HollowWriteStateEnginePrimaryKeyHasher {

    private final HollowObjectTypeWriteState typeStates[][];
    private final int[][] fieldPathIndexes;

    public HollowWriteStateEnginePrimaryKeyHasher(PrimaryKey primaryKey, HollowWriteStateEngine writeEngine) {
        HollowWriteStateEngine stateEngine = writeEngine;
        HollowObjectTypeWriteState rootTypeWriteState = (HollowObjectTypeWriteState)writeEngine.getTypeState(primaryKey.getType());
        
        this.fieldPathIndexes = new int[primaryKey.numFields()][];
        this.typeStates = new HollowObjectTypeWriteState[primaryKey.numFields()][];
        
        for(int i=0;i>> 32));
        case REFERENCE:
            return VarInt.readVInt(data, offset);
        case BYTES:
            int byteLen = VarInt.readVInt(data, offset);
            offset += VarInt.sizeOfVInt(byteLen);
            return HashCodes.hashCode(data, offset, byteLen);
        case STRING:
            int strByteLen = VarInt.readVInt(data, offset);
            offset += VarInt.sizeOfVInt(strByteLen);
            return getNaturalStringHashCode(data, offset, strByteLen);
        case BOOLEAN:
            if(VarInt.readVNull(data, offset))
                return 0;
            return data.get(offset) == 1 ? 1231 : 1237;
        case DOUBLE:
            long longBits = data.readLongBits(offset);
            return (int)(longBits ^ (longBits >>> 32));
        case FLOAT:
            return data.readIntBits(offset);
        default:
            throw new IllegalArgumentException("Schema "+schema.getName()+" has unknown field type for field " + schema.getFieldName(fieldIdx) + ": " + schema.getFieldType(fieldIdx));
        }
    }
    
    private int getNaturalStringHashCode(SegmentedByteArray data, long offset, int len) {
        int hashCode = 0;
        long endOffset = len + offset;
        
        while(offset < endOffset) {
            int ch = VarInt.readVInt(data, offset);
            hashCode = hashCode * 31 + ch;
            offset += VarInt.sizeOfVInt(ch);
        }
        
        return hashCode;
    }

}