com.aerospike.mapper.tools.virtuallist.ResultsUnpacker Maven / Gradle / Ivy

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package com.aerospike.mapper.tools.virtuallist;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;

public interface ResultsUnpacker {
    Object unpack(Object object);

    class ListUnpacker implements ResultsUnpacker {
        private ListUnpacker() {
        }

        @Override
        public Object unpack(Object object) {
            if (object == null) {
                return null;
            } else {
                List list = (List) object;
                return list.isEmpty() ? null : list.get(0);
            }
        }

        public final static ListUnpacker instance = new ListUnpacker();
    }

    class IdentityUnpacker implements ResultsUnpacker {
        private IdentityUnpacker() {
        }

        @Override
        public Object unpack(Object object) {
            return object;
        }

        public final static IdentityUnpacker instance = new IdentityUnpacker();
    }

    class ElementUnpacker implements ResultsUnpacker {
        Function function;

        public ElementUnpacker(Function itemMapper) {
            this.function = itemMapper;
        }

        @Override
        public Object unpack(Object object) {
            return function.apply(object);
        }
    }

    class ArrayUnpacker implements ResultsUnpacker {
        Function function;

        public ArrayUnpacker(Function itemMapper) {
            this.function = itemMapper;
        }

        @Override
        public Object unpack(Object object) {
            if (object == null) {
                return null;
            }

            List