Bean Validator Example

[parisni]

Hello Claude,

Here a simple example of bean validation applied on PA4RDF.
Notice I haven't tested this code, just copy paste from my project.

Pom dependency

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.2.1.Final</version>
        </dependency>
        <dependency>
            <groupId>javax.el</groupId>
            <artifactId>javax.el-api</artifactId>
            <version>2.2.4</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>javax.el</artifactId>
            <version>2.2.4</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator-cdi</artifactId>
            <version>5.2.1.Final</version>
        </dependency>

Book Class, with beans validation annotations

@Subject( namespace="http://example.com/PA4RDF#" )
public class Book {
        @Override
        @Predicate( impl = true, emptyIsNull = true)
    public public void setTitle( String title)
    {
        throw new EntityManagerRequiredException();
    }

        @Override
        @Predicate( impl = true, emptyIsNull = true)
        @NotNull
        public String getTitle()
        {
            throw new EntityManagerRequiredException();
        }

        @Override
        @Predicate( impl = true )
        public void addAuthor( String author )
        {
            throw new EntityManagerRequiredException();
        }

        @Override
        @Predicate( impl = true, type=String.class )
        @Size(min=3)
        public List<String> getAuthor() {
            throw new EntityManagerRequiredException();
        }

        @Override
        @Predicate( impl = true , emptyIsNull = true)
        public void setPageCount( Integer int )
        {
            throw new EntityManagerRequiredException();
        }

        @Override
        @Predicate( impl = true , emptyIsNull = true)  
        public boolean hasPageCount()
        {
            throw new EntityManagerRequiredException();
        }

        @Override
        @Predicate( impl = true, emptyIsNull = true ) 
        @NotNull  
        @Min(1)
        public int getPageCount()
        {
            throw new EntityManagerRequiredException();
        }

}

Example code reading the Book class

try{
    dataset.begin( ReadWrite.WRITE );
    model = dataset.getDefaultModel();
    EntityManager entityManager = EntityManagerFactory.getEntityManager();
    Resource r = model.createResource( "http://example.com/mylibrary/book1" );


    Book book = EntityManager.read( r, Book.class );
    book.addAuthor( "Maurice Naftalin" );
    book.addAuthor( "Philip Wadler" );
    book.setPageCount( 0 );
    book.setTItle( null );

   //VALIDATION PHASE
    ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
    Validator validator = factory.getValidator();

    Set<ConstraintViolation<Book>> constraintViolations = validator.validate( book );
    StringBuilder errors = new StringBuilder();
    if ( constraintViolations.size() > 0 ) {
        for ( ConstraintViolation<Book> contraintes : constraintViolations ) {
            errors.append(contraintes.getPropertyPath().toString());
            errors.append(" : ");
            errors.append ( contraintes.getMessage());
            errors.append(",");
        }
        throw new Exception( errors.toString() );
    }
    dataset.commit();
}catch(Exception e){
    dataset.abord();
    System.out.println(e.getMessage());
}
finally{
    dataset.end();
}

Result of example code

Title : Cannot be null, PageCount : must be at least 1,  Author : must be at least 3

[Claudenw]

Is there a way to verify that the author has been set? I know you could
have anonymous books but just as an example for collections.

Claude

On Wed, Sep 16, 2015 at 3:29 PM, Paris Nicolas [email protected]
wrote:

Hello Claude,

Here a simple example of bean validation applied on PA4RDF.
Notice I haven't tested this code, just copy paste from my project.
Pom dependency

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>5.2.1.Final</version>
    </dependency>
    <dependency>
        <groupId>javax.el</groupId>
        <artifactId>javax.el-api</artifactId>
        <version>2.2.4</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.web</groupId>
        <artifactId>javax.el</artifactId>
        <version>2.2.4</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator-cdi</artifactId>
        <version>5.2.1.Final</version>
    </dependency>

Book Class, with beans validation annotations

@subject( namespace="http://example.com/PA4RDF#" )
public class Book {

public public void setTitle( String title)
{
    throw new EntityManagerRequiredException();
}

@Override
    @Predicate( impl = true )
    @NotNull
    public String getTitle()
    {
        throw new EntityManagerRequiredException();
    }

@Override
    @Predicate( impl = true )
    public void addAuthor( String author )
    {
        throw new EntityManagerRequiredException();
    }

@Override
    @Predicate( impl = true, type=String.class )
    public List<String> getAuthor() {
        throw new EntityManagerRequiredException();
    }

@Override
    @Predicate( impl = true )
    public void setPageCount( Integer int )
    {
        throw new EntityManagerRequiredException();
    }

@Override
    @Predicate( impl = true )
    public boolean hasPageCount()
    {
        throw new EntityManagerRequiredException();
    }

@Override
    @Predicate( impl = true )
    @NotNull
    @Min(1)
    public int getPageCount()
    {
        throw new EntityManagerRequiredException();
    }

}

Example code reading the Book class

try{
dataset.begin( ReadWrite.WRITE );
model = dataset.getDefaultModel();
EntityManager entityManager = EntityManagerFactory.getEntityManager();
Resource r = model.createResource( "http://example.com/mylibrary/book1" );

Book book = EntityManager.read( r, Book.class );
book.addAuthor( "Maurice Naftalin" );
book.addAuthor( "Philip Wadler" );
book.setPageCount( 0 );

//VALIDATION PHASE
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
Validator validator = factory.getValidator();

Set<ConstraintViolation<Book>> constraintViolations = validator.validate( book );
StringBuilder errors = new StringBuilder();
if ( constraintViolations.size() > 0 ) {
    for ( ConstraintViolation<Book> contraintes : constraintViolations ) {
        errors.append(contraintes.getPropertyPath().toString());
        errors.append(" : ");
        errors.append ( contraintes.getMessage());
        errors.append(",");
    }
    throw new Exception( errors.toString() );
}
dataset.commit();

}catch(Exception e){
dataset.abord();
System.out.println(e.getMessage());
}
finally{
dataset.end();
}

Result of example code

Title : Cannot be null, PageCount : must be at least 1,

—
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#2.

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[parisni]

I guess thanks to the @SiZe annotation
The documentation says :

The size of the field or property is evaluated and must match the specified boundaries. If the field or property is a String, the size of the string is evaluated. If the field or property is a Collection, the size of the Collection is evaluated. If the field or property is a Map, the size of the Map is evaluated. If the field or property is an array, the size of the array is evaluated. Use one of the optional max or min elements to specify the boundaries.

then :

@Size(min=1)

should do the job

I wil give a try to confirm

EDIT :
Notice that @Valid annotation does :

Performs validation recursively on the associated object. If the object is a collection or an array, the elements are validated recursively. If the object is a map, the value elements are validated recursively.