Hibernate StringTrimUserType

Use for fixed length column definitions. (e.g. DB2 'char' type)

Source:

package example.usertype;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

import org.hibernate.Hibernate;
import org.hibernate.usertype.UserType;

/**
 * 
 * based on www.hibernate.org/388.html
 */

public class StringTrimUserType implements UserType {

 /**
  * 
  * default constructor
  */

 public StringTrimUserType() {
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#sqlTypes()
  */

 public int[] sqlTypes() {
  return new int[] { Types.CHAR };
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#returnedClass()
  */

 @SuppressWarnings("unchecked")
 public Class returnedClass() {
  return String.class;
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#equals(java.lang.Object,
  *      java.lang.Object)
  */

 public boolean equals(Object x, Object y) {
  return (x == y) || (x != null && y != null && (x.equals(y)));
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#nullSafeGet(java.sql.ResultSet,
  *      java.lang.String[], java.lang.Object)
  */

 public Object nullSafeGet(ResultSet inResultSet, String[] names, Object o) throws SQLException {

  String val = (String) Hibernate.STRING.nullSafeGet(inResultSet, names[0]);
  return val == null ? null : val.trim();
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#nullSafeSet(java.sql.PreparedStatement,
  *      java.lang.Object, int)
  */

 public void nullSafeSet(PreparedStatement inPreparedStatement, Object o,
   int i)

 throws SQLException {

  String val = (String) o;
  inPreparedStatement.setString(i, val);
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#deepCopy(java.lang.Object)
  */

 public Object deepCopy(Object o) {
  if (o == null) {
   return null;
  }
  return new String(((String) o));
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#isMutable()
  */

 public boolean isMutable() {
  return false;
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#assemble(java.io.Serializable,
  *      java.lang.Object)
  */

 public Object assemble(Serializable cached, Object owner) {
  return cached;
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#disassemble(java.lang.Object)
  */

 public Serializable disassemble(Object value) {
  return (Serializable) value;
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#replace(java.lang.Object,
  *      java.lang.Object, java.lang.Object)
  */

 public Object replace(Object original, Object target, Object owner) {
  return original;
 }

 /**
  * 
  * @see org.hibernate.usertype.UserType#hashCode(java.lang.Object)
  */

 public int hashCode(Object x) {
  return x.hashCode();
 }

}

Usage:

@Column(name = "CMODULE", unique = true, nullable = false, length = 10, columnDefinition = "char")
    @Type(type = "example.usertype.StringTrimUserType")
    public String getModuleCode() {
 return this.moduleCode;
    }

    public void setModuleCode(String moduleId) {
 this.moduleCode = moduleId;
    }