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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.impl;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.ScrollableResults;
import org.hibernate.engine.QueryParameters;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.exception.JDBCExceptionHelper;
import org.hibernate.hql.HolderInstantiator;
import org.hibernate.loader.Loader;
import org.hibernate.type.Type;
/**
* Implementation of the ScrollableResults interface
*
* @author Steve Ebersole
*/
public abstract class AbstractScrollableResults implements ScrollableResults {
private static final Logger log = LoggerFactory.getLogger( AbstractScrollableResults.class );
private final ResultSet resultSet;
private final PreparedStatement ps;
private final SessionImplementor session;
private final Loader loader;
private final QueryParameters queryParameters;
private final Type[] types;
private HolderInstantiator holderInstantiator;
public AbstractScrollableResults(
ResultSet rs,
PreparedStatement ps,
SessionImplementor sess,
Loader loader,
QueryParameters queryParameters,
Type[] types,
HolderInstantiator holderInstantiator) throws MappingException {
this.resultSet=rs;
this.ps=ps;
this.session = sess;
this.loader = loader;
this.queryParameters = queryParameters;
this.types = types;
this.holderInstantiator = holderInstantiator!=null && holderInstantiator.isRequired()
? holderInstantiator
: null;
}
protected abstract Object[] getCurrentRow();
protected ResultSet getResultSet() {
return resultSet;
}
protected PreparedStatement getPs() {
return ps;
}
protected SessionImplementor getSession() {
return session;
}
protected Loader getLoader() {
return loader;
}
protected QueryParameters getQueryParameters() {
return queryParameters;
}
protected Type[] getTypes() {
return types;
}
protected HolderInstantiator getHolderInstantiator() {
return holderInstantiator;
}
public final void close() throws HibernateException {
try {
// not absolutely necessary, but does help with aggressive release
session.getBatcher().closeQueryStatement( ps, resultSet );
}
catch (SQLException sqle) {
throw JDBCExceptionHelper.convert(
session.getFactory().getSQLExceptionConverter(),
sqle,
"could not close results"
);
}
finally {
try {
session.getPersistenceContext().getLoadContexts().cleanup( resultSet );
}
catch( Throwable ignore ) {
// ignore this error for now
log.trace( "exception trying to cleanup load context : " + ignore.getMessage() );
}
}
}
public final Object[] get() throws HibernateException {
return getCurrentRow();
}
public final Object get(int col) throws HibernateException {
return getCurrentRow()[col];
}
/**
* Check that the requested type is compatible with the result type, and
* return the column value. This version makes sure the the classes
* are identical.
*
* @param col the column
* @param returnType a "final" type
*/
protected final Object getFinal(int col, Type returnType) throws HibernateException {
if ( holderInstantiator!=null ) {
throw new HibernateException("query specifies a holder class");
}
if ( returnType.getReturnedClass()==types[col].getReturnedClass() ) {
return get(col);
}
else {
return throwInvalidColumnTypeException(col, types[col], returnType);
}
}
/**
* Check that the requested type is compatible with the result type, and
* return the column value. This version makes sure the the classes
* are "assignable".
*
* @param col the column
* @param returnType any type
*/
protected final Object getNonFinal(int col, Type returnType) throws HibernateException {
if ( holderInstantiator!=null ) {
throw new HibernateException("query specifies a holder class");
}
if ( returnType.getReturnedClass().isAssignableFrom( types[col].getReturnedClass() ) ) {
return get(col);
}
else {
return throwInvalidColumnTypeException(col, types[col], returnType);
}
}
public final BigDecimal getBigDecimal(int col) throws HibernateException {
return (BigDecimal) getFinal(col, Hibernate.BIG_DECIMAL);
}
public final BigInteger getBigInteger(int col) throws HibernateException {
return (BigInteger) getFinal(col, Hibernate.BIG_INTEGER);
}
public final byte[] getBinary(int col) throws HibernateException {
return (byte[]) getFinal(col, Hibernate.BINARY);
}
public final String getText(int col) throws HibernateException {
return (String) getFinal(col, Hibernate.TEXT);
}
public final Blob getBlob(int col) throws HibernateException {
return (Blob) getNonFinal(col, Hibernate.BLOB);
}
public final Clob getClob(int col) throws HibernateException {
return (Clob) getNonFinal(col, Hibernate.CLOB);
}
public final Boolean getBoolean(int col) throws HibernateException {
return (Boolean) getFinal(col, Hibernate.BOOLEAN);
}
public final Byte getByte(int col) throws HibernateException {
return (Byte) getFinal(col, Hibernate.BYTE);
}
public final Character getCharacter(int col) throws HibernateException {
return (Character) getFinal(col, Hibernate.CHARACTER);
}
public final Date getDate(int col) throws HibernateException {
return (Date) getNonFinal(col, Hibernate.TIMESTAMP);
}
public final Calendar getCalendar(int col) throws HibernateException {
return (Calendar) getNonFinal(col, Hibernate.CALENDAR);
}
public final Double getDouble(int col) throws HibernateException {
return (Double) getFinal(col, Hibernate.DOUBLE);
}
public final Float getFloat(int col) throws HibernateException {
return (Float) getFinal(col, Hibernate.FLOAT);
}
public final Integer getInteger(int col) throws HibernateException {
return (Integer) getFinal(col, Hibernate.INTEGER);
}
public final Long getLong(int col) throws HibernateException {
return (Long) getFinal(col, Hibernate.LONG);
}
public final Short getShort(int col) throws HibernateException {
return (Short) getFinal(col, Hibernate.SHORT);
}
public final String getString(int col) throws HibernateException {
return (String) getFinal(col, Hibernate.STRING);
}
public final Locale getLocale(int col) throws HibernateException {
return (Locale) getFinal(col, Hibernate.LOCALE);
}
/*public final Currency getCurrency(int col) throws HibernateException {
return (Currency) get(col);
}*/
public final TimeZone getTimeZone(int col) throws HibernateException {
return (TimeZone) getNonFinal(col, Hibernate.TIMEZONE);
}
public final Type getType(int i) {
return types[i];
}
private Object throwInvalidColumnTypeException(
int i,
Type type,
Type returnType) throws HibernateException {
throw new HibernateException(
"incompatible column types: " +
type.getName() +
", " +
returnType.getName()
);
}
protected void afterScrollOperation() {
session.afterScrollOperation();
}
}
