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HstoreUserType.java
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HstoreUserType.java
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package net.backtothefront;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.usertype.UserType;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.HashMap;
import java.util.Map;
// courtesy of: http://backtothefront.net/2011/storing-sets-keyvalue-pairs-single-db-column-hibernate-postgresql-hstore-type/
public class HstoreUserType implements UserType {
public Object assemble(Serializable cached, Object owner)
throws HibernateException {
return cached;
}
public Object deepCopy(Object o) throws HibernateException {
// It's not a true deep copy, but we store only String instances, and they
// are immutable, so it should be OK
Map m = (Map) o;
return new HashMap(m);
}
public Serializable disassemble(Object o) throws HibernateException {
return (Serializable) o;
}
public boolean equals(Object o1, Object o2) throws HibernateException {
Map m1 = (Map) o1;
Map m2 = (Map) o2;
return m1.equals(m2);
}
public int hashCode(Object o) throws HibernateException {
return o.hashCode();
}
@Override
public Object nullSafeGet(ResultSet resultSet, String[] strings, SessionImplementor sessionImplementor, Object o) throws HibernateException, SQLException {
String col = strings[0];
String val = resultSet.getString(col);
return HstoreHelper.toMap(val);
}
@Override
public void nullSafeSet(PreparedStatement preparedStatement, Object o, int i, SessionImplementor sessionImplementor) throws HibernateException, SQLException {
String s = HstoreHelper.toString((Map) o);
preparedStatement.setObject(i, s, Types.OTHER);
}
public boolean isMutable() {
return true;
}
public Object replace(Object original, Object target, Object owner)
throws HibernateException {
return original;
}
public Class returnedClass() {
return Map.class;
}
public int[] sqlTypes() {
/*
* i'm not sure what value should be used here, but it works, AFAIK only
* length of this array matters, as it is a column span (1 in our case)
*/
return new int[] { Types.INTEGER };
}
}