URI Type for Hibernate, works fine with https://github.com/petere/pguri

URICustomType.java

package com.xenji.xm.model.hibernate;

import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.usertype.UserType;

import java.io.Serializable;
import java.net.URI;
import java.net.URISyntaxException;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

/**
 * @author mmueller
 * @since 2016-07-30 13:48.
 */
public class URICustomType implements UserType {
    /**
     * Return the SQL type codes for the columns mapped by this type. The
     * codes are defined on <tt>java.sql.Types</tt>.
     *
     * @return int[] the typecodes
     *
     * @see Types
     */
    @Override
    public int[] sqlTypes() {
        return new int[] {Types.OTHER};
    }

    /**
     * The class returned by <tt>nullSafeGet()</tt>.
     *
     * @return Class
     */
    @Override
    public Class returnedClass() {
        return URI.class;
    }

    /**
     * Compare two instances of the class mapped by this type for persistence "equality".
     * Equality of the persistent state.
     *
     * @return boolean
     */
    @Override
    public boolean equals(Object x, Object y) throws HibernateException {
        return x.equals(y);
    }

    /**
     * Get a hashcode for the instance, consistent with persistence "equality"
     */
    @Override
    public int hashCode(Object x) throws HibernateException {
        return x.hashCode();
    }

    /**
     * Retrieve an instance of the mapped class from a JDBC resultset. Implementors
     * should handle possibility of null values.
     *
     * @param rs    a JDBC result set
     * @param names the column names
     * @param owner the containing entity  @return Object
     */
    @Override
    public Object nullSafeGet(
            ResultSet rs, String[] names, SessionImplementor session, Object owner
    ) throws HibernateException, SQLException {
        try {
            return new URI(rs.getString(names[0]));
        }
        catch (URISyntaxException e) {
            throw new HibernateException(e);
        }
    }

    /**
     * Write an instance of the mapped class to a prepared statement. Implementors
     * should handle possibility of null values. A multi-column type should be written
     * to parameters starting from <tt>index</tt>.
     *
     * @param st    a JDBC prepared statement
     * @param value the object to write
     * @param index statement parameter index
     */
    @Override
    public void nullSafeSet(
            PreparedStatement st, Object value, int index, SessionImplementor session
    ) throws HibernateException, SQLException {
        if(value == null) {
            st.setObject(index, null, Types.OTHER);
        } else {
            final URI theUri = (URI)value;
            st.setObject(index, theUri.toString(), Types.OTHER);
        }
    }

    /**
     * Return a deep copy of the persistent state, stopping at entities and at
     * collections. It is not necessary to copy immutable objects, or null
     * values, in which case it is safe to simply return the argument.
     *
     * @param value the object to be cloned, which may be null
     *
     * @return Object a copy
     */
    @Override
    public Object deepCopy(Object value) throws HibernateException {
        return value;
    }

    /**
     * Are objects of this type mutable?
     *
     * @return boolean
     */
    @Override
    public boolean isMutable() {
        return false;
    }

    /**
     * Transform the object into its cacheable representation. At the very least this
     * method should perform a deep copy if the type is mutable. That may not be enough
     * for some implementations, however; for example, associations must be cached as
     * identifier values. (optional operation)
     *
     * @param value the object to be cached
     *
     * @return a cachable representation of the object
     */
    @Override
    public Serializable disassemble(Object value) throws HibernateException {
        return (Serializable) value;
    }

    /**
     * Reconstruct an object from the cacheable representation. At the very least this
     * method should perform a deep copy if the type is mutable. (optional operation)
     *
     * @param cached the object to be cached
     * @param owner  the owner of the cached object
     *
     * @return a reconstructed object from the cachable representation
     */
    @Override
    public Object assemble(Serializable cached, Object owner) throws HibernateException {
        return cached;
    }

    /**
     * During merge, replace the existing (target) value in the entity we are merging to
     * with a new (original) value from the detached entity we are merging. For immutable
     * objects, or null values, it is safe to simply return the first parameter. For
     * mutable objects, it is safe to return a copy of the first parameter. For objects
     * with component values, it might make sense to recursively replace component values.
     *
     * @param original the value from the detached entity being merged
     * @param target   the value in the managed entity
     *
     * @return the value to be merged
     */
    @Override
    public Object replace(Object original, Object target, Object owner) throws HibernateException {
        return original;
    }
}