JPA cloner

The project allows cloning of JPA entity subgraphs. Entity subgraphs are defined by string patterns. Cloned entities will have all basic properties copied by default. Advanced control over the cloning process is supported via the PropertyFilter interface.

<dependency>
    <groupId>com.github.nociar</groupId>
    <artifactId>jpa-cloner</artifactId>
    <version>1.0.3</version>
</dependency>

Example usage

Company company = entityManager.find(Company.class, companyId);
Company clone1 = JpaCloner.clone(company, "departments.*");
Company clone2 = JpaCloner.clone(company, "depa??ments");
Company clone3 = JpaCloner.clone(company, "departments+.(boss|employees).address");
// do not clone @Id and @Transient fields for the whole entity subgraph:
PropertyFilter filter = PropertyFilters.getAnnotationFilter(Id.class, Transient.class);
Company clone4 = JpaCloner.clone(company, filter, "*+");
// custom property filter
PropertyFilter myFilter = new PropertyFilter() {
    public boolean test(Object entity, String property) {
        return !"ignoredProperty".equals(property);
    }
};
Company clone5 = JpaCloner.clone(company, myFilter, "*+");

Operators

• Dot "." separates paths: A.B.C
• Plus "+" generates at least one preceding path: A.B+.C
• Split "|" divides the path into two ways: A.(B|C).D
• Terminator "$" ends the preceding path: A.(B$|C).D
• Parentheses "(", ")" groups the paths.
• Wildcards "*", "?" in property names: dumm?.pro*ties

Requirements

• The JPA cloner is tested only against Hibernate.
• Cloned entities must correctly implement equals() and hashCode().

Please refer to the JpaCloner class for more description.