queryimpl.java

用Java实现的23个常用设计模式源代码

//$Id: QueryImpl.java,v 1.19.2.7 2003/11/02 08:56:48 oneovthafew Exp $
package net.sf.hibernate.impl;

import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Query;
import net.sf.hibernate.ScrollableResults;
import net.sf.hibernate.engine.QueryParameters;
import net.sf.hibernate.engine.SessionImplementor;

/**
 * default implementation of the <tt>Query</tt> interface,
 * for "ordinary" HQL queries (not collection filters)
 * @see FilterImpl
 * @author Gavin King
 */
public class QueryImpl extends AbstractQueryImpl {
	
	private boolean cacheable;
	private String cacheRegion;

	public QueryImpl(String queryString, SessionImplementor session) {
		super(queryString, session);				
		this.cacheRegion = null;
	}
	
	public Iterator iterate() throws HibernateException {
		verifyParameters();
		Map namedParams = getNamedParams();
		return getSession().iterate( bindParameterLists(namedParams), getQueryParameters(namedParams) );
	}
	
	public ScrollableResults scroll() throws HibernateException {
		verifyParameters();
		Map namedParams = getNamedParams();
		return getSession().scroll( bindParameterLists(namedParams), getQueryParameters(namedParams) );
	}
	
	public List list() throws HibernateException {
		verifyParameters();
		Map namedParams = getNamedParams();
		return getSession().find( bindParameterLists(namedParams), getQueryParameters(namedParams) );
	}
	
	public Query setCacheable(boolean cacheable) {
		this.cacheable = cacheable;
		return this;
	}
	
	public Query setCacheRegion(String cacheRegion) {
		this.cacheRegion = cacheRegion.trim();
		return this;

	}

	public QueryParameters getQueryParameters(Map namedParams) {
		QueryParameters result = super.getQueryParameters(namedParams);
		result.setCacheable(cacheable);
		result.setCacheRegion(cacheRegion);
		return result;
	}
	
}