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Juery is a tiny Java library to manage search and filter query from user to database.

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# Juery [![](https://img./github/release/Marthym/juery.svg)](https://GitHub.com/Marthym/juery/releases/) [![GitHub license](https://img.shields.io/github/license/Marthym/juery.svg)](https://github.com/Marthym/juery/blob/master/LICENSE)

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**Juery** is a tiny Java library to manage search and filter query from user to database. **api** and **basic** packages 
have no dependencies. They contain everything you need to use Juery. The **jooq** package contains useful tools for 
projects using the jOOQ DSL.

## Installation

Use the package manager [maven](https://maven.apache.org/) to install juery.

```xml
<dependency>
    <groupId>fr.ght1pc9kc</groupId>
    <artifactId>juery-api</artifactId>
    <version>VERSION</version>
</dependency>
<dependency>
    <groupId>fr.ght1pc9kc</groupId>
    <artifactId>juery-basic</artifactId>
    <version>VERSION</version>
</dependency>
<dependency>
    <groupId>fr.ght1pc9kc</groupId>
    <artifactId>juery-jooq</artifactId>
    <version>VERSION</version>
</dependency>
```

for gradle

```groovy
compile "fr.ght1pc9kc:juery-api:VERSION"
compile "fr.ght1pc9kc:juery-basic:VERSION"
compile "fr.ght1pc9kc:juery-jooq:VERSION"
```

## Usage

### Create Criteria and PageRequest manually

```java
import fr.ght1pc9kc.juery.api.Criteria;

Criteria.property("jedi").eq("Obiwan")
    .and(Criteria.property("age").gt(40)
    .or(Criteria.property("age").lt(20)));
```

```java
import fr.ght1pc9kc.juery.api.PageRequest;
import fr.ght1pc9kc.juery.api.pagination.Direction;
import fr.ght1pc9kc.juery.api.pagination.Order;
import fr.ght1pc9kc.juery.api.pagination.Sort;

PageRequest.builder()
    .page(2).size(100)
    .filter(Criteria.property("profile").eq("jedi").and(Criteria.property("job").eq("master")))
    .sort(Sort.of(new Order(Direction.ASC, "name"), new Order(Direction.DESC, "email")))
    .build();
```

### Parsing a query string

Into the controller.

```java
import fr.ght1pc9kc.juery.basic.QueryStringParser;

@GetMapping
public Flux<Feed> list(@RequestParam Map<String, String> queryStringParams) {
        return feedService.list(QueryStringParser.withDefaultConfig().parse(queryStringParams))
        .onErrorMap(BadCriteriaFilter.class, e -> new ResponseStatusException(HttpStatus.BAD_REQUEST, e.getLocalizedMessage()));
}
```

`QueryStringParser` will transform the query string into a` PageRequest` which contains a `Criteria`. 
Depending on your architecture, the object will traverse layers until persistence. 
It can be enriched in the process by `with` methods which create a new enriched object. **All the API is strictly immutable**.

*Since 1.2.0*: You can now, configure the `QueryStringParser` to customize the querystring parameters used :

```java
import fr.ght1pc9kc.juery.basic.ParserConfiguration;
        
ParserConfiguration config = ParserConfiguration.builder()
        .page("_pg")
        .size("_sz")
        .from("_fr")
        .to("_to")
        .sort("_st")
        .maxPageSize(20)
        .build();

QueryStringParser.withConfig(config).parse(queryStringParams);
```

### Filtering

In the persistence layer we will be able to use `Visitors` as follows.

```java
import fr.ght1pc9kc.juery.jooq.filter.JooqConditionVisitor;

private static final JooqConditionVisitor JOOQ_CONDITION_VISITOR =
        new JooqConditionVisitor(PropertiesMappers.FEEDS_PROPERTIES_MAPPING::get);
```

The `JooqConditionVisitor` implementation takes as input a `Function <String, Field <?>>` which will allow to transform
the properties of your criteria, into jOOQ `Field` objects corresponding to columns of your tables.

```java
import fr.ght1pc9kc.juery.api.Criteria;
import fr.ght1pc9kc.juery.api.PageRequest;

// transforms the Criteria present in pageRequest into Condition
Condition conditions = pageRequest.filter.visit(JOOQ_CONDITION_VISITOR);

// Execute query with the conditions generated by the visitor 
Cursor<Record> cursor = dsl
    .select(FEEDS.fields()).select(FEEDS_USERS.FEUS_TAGS)
        .from(FEEDS)
        .leftJoin(FEEDS_USERS).on(FEEDS_USERS.FEUS_FEED_ID.eq(FEEDS.FEED_ID))
        .where(conditions).fetchLazy();
```

### Pagination

The `PageRequest` object contains the data necessary for pagination. You can implement it yourself, 
but for jOOQ users, the `JooqPagination` helper makes it easier.

```java
import fr.ght1pc9kc.juery.api.Criteria;
import fr.ght1pc9kc.juery.api.PageRequest;

// transforms the Criteria present in pageRequest into Condition
Condition conditions = pageRequest.filter.visit(NEWS_CONDITION_VISITOR);

// Apply pagination parameters to the query
final Select<Record> query = JooqPagination.apply(pageRequest, PropertiesMappers.FEEDS_PROPERTIES_MAPPING, dsl
    .select(FEEDS.fields()).select(FEEDS_USERS.FEUS_TAGS)
        .from(FEEDS)
        .leftJoin(FEEDS_USERS).on(FEEDS_USERS.FEUS_FEED_ID.eq(FEEDS.FEED_ID))
        .where(conditions)
);

Cursor<Record> cursor = query.fetchLazy();
```

We find the `PropertiesMappers.FEEDS_PROPERTIES_MAPPING`, optional, which allows to make the link between the sort 
criteria and the table fields.

### PropertiesMappers example

As an example to illustrate what is `PropertiesMappers.FEEDS_PROPERTIES_MAPPING` in the context of using jOOQ as DSL.

```java
public static final Map<String, Field<?>> FEEDS_PROPERTIES_MAPPING = Map.of(
        "id", FEEDS.FEED_ID,
        "name", FEEDS.FEED_NAME,
        ...
);
```

`FEEDS` was a jOOQ Table generated before compilation with `jooq-codegen-maven` Maven Plugin. `"id"` and `"name"` was properties
used in `Criteria`.

```java
import fr.ght1pc9kc.juery.api.Criteria;

Criteria.property("id").eq("F0042")
    .and(Criteria.property("name").eq("H2G2"));
```

## Contributing
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

## License

[MIT](https://choosealicense.com/licenses/mit/)

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