//$Id: ClobType.java 7644 2005-07-25 06:53:09Z oneovthafew $
package org.hibernate.type;
import java.io.Serializable;
import java.sql.Clob;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Map;
import org.dom4j.Node;
import org.hibernate.EntityMode;
import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.engine.Mapping;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.lob.ClobImpl;
import org.hibernate.lob.SerializableClob;
import org.hibernate.util.ArrayHelper;
/**
* <tt>clob</tt>: A type that maps an SQL CLOB to a java.sql.Clob.
* @author Gavin King
*/
public class ClobType extends AbstractType {
public void set(PreparedStatement st, Object value, int index, SessionImplementor session)
throws HibernateException, SQLException {
if (value==null) {
st.setNull(index, Types.CLOB);
}
else {
if (value instanceof SerializableClob) {
value = ( (SerializableClob) value ).getWrappedClob();
}
final boolean useReader = session.getFactory().getDialect().useInputStreamToInsertBlob() &&
(value instanceof ClobImpl);
if ( useReader ) {
ClobImpl clob = (ClobImpl) value;
st.setCharacterStream( index, clob.getCharacterStream(), (int) clob.length() );
}
else {
st.setClob(index, (Clob) value);
}
}
}
public Object get(ResultSet rs, String name) throws HibernateException, SQLException {
Clob value = rs.getClob(name);
return rs.wasNull() ? null : new SerializableClob(value);
}
public Class getReturnedClass() {
return Clob.class;
}
public boolean isEqual(Object x, Object y, EntityMode entityMode) {
return x == y;
}
public int getHashCode(Object x, EntityMode entityMode) {
return System.identityHashCode(x);
}
public int compare(Object x, Object y, EntityMode entityMode) {
return 0; //lobs cannot be compared
}
public String getName() {
return "clob";
}
public Serializable disassemble(Object value, SessionImplementor session, Object owner)
throws HibernateException {
throw new UnsupportedOperationException("Clobs are not cacheable");
}
public Object deepCopy(Object value, EntityMode entityMode, SessionFactoryImplementor factory) {
return value;
}
public Object fromXMLNode(Node xml, Mapping factory) {
return Hibernate.createClob( xml.getText() );
}
public int getColumnSpan(Mapping mapping) {
return 1;
}
public boolean isMutable() {
return false;
}
public Object nullSafeGet(ResultSet rs, String name,
SessionImplementor session, Object owner)
throws HibernateException, SQLException {
return get(rs, name);
}
public Object nullSafeGet(ResultSet rs, String[] names,
SessionImplementor session, Object owner)
throws HibernateException, SQLException {
return get( rs, names[0] );
}
public void nullSafeSet(PreparedStatement st, Object value, int index,
boolean[] settable, SessionImplementor session)
throws HibernateException, SQLException {
if ( settable[0] ) set(st, value, index, session);
}
public void nullSafeSet(PreparedStatement st, Object value, int index,
SessionImplementor session) throws HibernateException, SQLException {
set(st, value, index, session);
}
public Object replace(Object original, Object target,
SessionImplementor session, Object owner, Map copyCache)
throws HibernateException {
//Clobs are ignored by merge() operation
return target;
}
public int[] sqlTypes(Mapping mapping) throws MappingException {
return new int[] { Types.CLOB };
}
public void setToXMLNode(Node node, Object value, SessionFactoryImplementor factory) {
if (value!=null) {
Clob clob = (Clob) value;
try {
int len = (int) clob.length();
node.setText( clob.getSubString(0, len) );
}
catch (SQLException sqle) {
throw new HibernateException("could not read XML from Clob", sqle);
}
}
}
public String toLoggableString(Object value, SessionFactoryImplementor factory)
throws HibernateException {
return value==null ? "null" : value.toString();
}
public boolean[] toColumnNullness(Object value, Mapping mapping) {
return value==null ? ArrayHelper.FALSE : ArrayHelper.TRUE;
}
public boolean isDirty(Object old, Object current, boolean[] checkable, SessionImplementor session) throws HibernateException {
return checkable[0] && isDirty(old, current, session);
}
}
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