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Library for dynamic searching into the databases

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package ru.sergkorot.dynamic.operation;

import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Component;
import ru.sergkorot.dynamic.util.SpecificationUtils;

import java.util.Collections;

import static org.springframework.data.jpa.domain.Specification.where;
import static ru.sergkorot.dynamic.model.enums.ValueType.cast;
import static ru.sergkorot.dynamic.model.enums.ValueType.collectionCast;

/**
 * @author Sergey Korotaev
 * Service is realization Operation provider interface for building different specifications
 * @param  - the entity for which the request is being built
 * @see OperationProvider
 */
@Component
public class SpecificationOperationProviderImpl implements OperationProvider> {

    @Override
    public Operation> like() {
        return param -> where(SpecificationUtils.findByColumnsLike(param.getValue().toString(), Collections.singleton(param.getName())));
    }

    @Override
    public Operation> eq() {
        return param -> where(SpecificationUtils.findByColumnEquals(cast(param.getValue()), param.getName()));
    }

    @Override
    public Operation> notEq() {
        return param -> where(SpecificationUtils.findByColumnNotEquals(cast(param.getValue()), param.getName()));
    }

    @Override
    public Operation> in() {
        return param ->
                where(SpecificationUtils.findByCollectionIn(collectionCast(param.getValue()), param.getName()));
    }

    @Override
    public Operation> notIn() {
        return param ->
                where(SpecificationUtils.findByCollectionNotIn(collectionCast(param.getValue()), param.getName()));
    }

    @Override
    public Operation> isNull() {
        return param -> where(SpecificationUtils.findByColumnIsNull(param.getName()));
    }

    @Override
    public Operation> lessThan() {
        return param -> where(SpecificationUtils.lessThan(param.getValue().toString(), param.getName()));
    }

    @Override
    public Operation> greaterThan() {
        return param -> where(SpecificationUtils.greaterThan(param.getValue().toString(), param.getName()));
    }

    @Override
    public Operation> greaterThanOrEquals() {
        return param -> where(SpecificationUtils.greaterThanOrEqual(param.getValue().toString(), param.getName()));
    }

    @Override
    public Operation> lessThanOrEquals() {
        return param -> where(SpecificationUtils.lessThanOrEqual(param.getValue().toString(), param.getName()));
    }

    public Operation> contains() {
        return param -> where(SpecificationUtils.contains(param.getValue(), param.getName()));
    }
}