//$Id: ScrollableResults.java 6411 2005-04-13 07:37:50Z oneovthafew $
package org.hibernate;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Blob;
import java.sql.Clob;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import org.hibernate.type.Type;
/**
* A result iterator that allows moving around within the results
* by arbitrary increments. The <tt>Query</tt> / <tt>ScrollableResults</tt>
* pattern is very similar to the JDBC <tt>PreparedStatement</tt>/
* <tt>ResultSet</tt> pattern and the semantics of methods of this interface
* are similar to the similarly named methods on <tt>ResultSet</tt>.<br>
* <br>
* Contrary to JDBC, columns of results are numbered from zero.
*
* @see Query#scroll()
* @author Gavin King
*/
public interface ScrollableResults {
/**
* Advance to the next result
* @return <tt>true</tt> if there is another result
*/
public boolean next() throws HibernateException;
/**
* Retreat to the previous result
* @return <tt>true</tt> if there is a previous result
*/
public boolean previous() throws HibernateException;
/**
* Scroll an arbitrary number of locations
* @param i a positive (forward) or negative (backward) number of rows
* @return <tt>true</tt> if there is a result at the new location
*/
public boolean scroll(int i) throws HibernateException;
/**
* Go to the last result
* @return <tt>true</tt> if there are any results
*/
public boolean last() throws HibernateException;
/**
* Go to the first result
* @return <tt>true</tt> if there are any results
*/
public boolean first() throws HibernateException;
/**
* Go to a location just before first result (this is the initial location)
*/
public void beforeFirst() throws HibernateException;
/**
* Go to a location just after the last result
*/
public void afterLast() throws HibernateException;
/**
* Is this the first result?
*
* @return <tt>true</tt> if this is the first row of results
* @throws HibernateException
*/
public boolean isFirst() throws HibernateException;
/**
* Is this the last result?
*
* @return <tt>true</tt> if this is the last row of results
* @throws HibernateException
*/
public boolean isLast() throws HibernateException;
/**
* Release resources immediately.
*/
public void close() throws HibernateException;
/**
* Get the current row of results
* @return an object or array
*/
public Object[] get() throws HibernateException;
/**
* Get the <tt>i</tt>th object in the current row of results, without
* initializing any other results in the row. This method may be used
* safely, regardless of the type of the column (ie. even for scalar
* results).
* @param i the column, numbered from zero
* @return an object of any Hibernate type or <tt>null</tt>
*/
public Object get(int i) throws HibernateException;
/**
* Get the type of the <tt>i</tt>th column of results
* @param i the column, numbered from zero
* @return the Hibernate type
*/
public Type getType(int i);
/**
* Convenience method to read an <tt>integer</tt>
*/
public Integer getInteger(int col) throws HibernateException;
/**
* Convenience method to read a <tt>long</tt>
*/
public Long getLong(int col) throws HibernateException;
/**
* Convenience method to read a <tt>float</tt>
*/
public Float getFloat(int col) throws HibernateException;
/**
* Convenience method to read a <tt>boolean</tt>
*/
public Boolean getBoolean(int col) throws HibernateException;
/**
* Convenience method to read a <tt>double</tt>
*/
public Double getDouble(int col) throws HibernateException;
/**
* Convenience method to read a <tt>short</tt>
*/
public Short getShort(int col) throws HibernateException;
/**
* Convenience method to read a <tt>byte</tt>
*/
public Byte getByte(int col) throws HibernateException;
/**
* Convenience method to read a <tt>character</tt>
*/
public Character getCharacter(int col) throws HibernateException;
/**
* Convenience method to read a <tt>binary</tt>
*/
public byte[] getBinary(int col) throws HibernateException;
/**
* Convenience method to read <tt>text</tt>
*/
public String getText(int col) throws HibernateException;
/**
* Convenience method to read a <tt>blob</tt>
*/
public Blob getBlob(int col) throws HibernateException;
/**
* Convenience method to read a <tt>clob</tt>
*/
public Clob getClob(int col) throws HibernateException;
/**
* Convenience method to read a <tt>string</tt>
*/
public String getString(int col) throws HibernateException;
/**
* Convenience method to read a <tt>big_decimal</tt>
*/
public BigDecimal getBigDecimal(int col) throws HibernateException;
/**
* Convenience method to read a <tt>big_integer</tt>
*/
public BigInteger getBigInteger(int col) throws HibernateException;
/**
* Convenience method to read a <tt>date</tt>, <tt>time</tt> or <tt>timestamp</tt>
*/
public Date getDate(int col) throws HibernateException;
/**
* Convenience method to read a <tt>locale</tt>
*/
public Locale getLocale(int col) throws HibernateException;
/**
* Convenience method to read a <tt>calendar</tt> or <tt>calendar_date</tt>
*/
public Calendar getCalendar(int col) throws HibernateException;
/**
* Convenience method to read a <tt>currency</tt>
*/
//public Currency getCurrency(int col) throws HibernateException;
/**
* Convenience method to read a <tt>timezone</tt>
*/
public TimeZone getTimeZone(int col) throws HibernateException;
/**
* Get the current location in the result set. The first
* row is number <tt>0</tt>, contrary to JDBC.
* @return the row number, numbered from <tt>0</tt>, or <tt>-1</tt> if
* there is no current row
*/
public int getRowNumber() throws HibernateException;
/**
* Set the current location in the result set, numbered from either the
* first row (row number <tt>0</tt>), or the last row (row
* number <tt>-1</tt>).
* @param rowNumber the row number, numbered from the last row, in the
* case of a negative row number
* @return true if there is a row at that row number
*/
public boolean setRowNumber(int rowNumber) throws HibernateException;
}
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