//$Id: CollectionFilterImpl.java 8524 2005-11-04 21:28:49Z steveebersole $
package org.hibernate.impl;

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

import org.hibernate.HibernateException;
import org.hibernate.ScrollableResults;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.engine.query.ParameterMetadata;
import org.hibernate.type.Type;

/**
 * implementation of the <tt>Query</tt> interface for collection filters
 * @author Gavin King
 */
public class CollectionFilterImpl extends QueryImpl {

	private Object collection;

	public CollectionFilterImpl(
			String queryString,
	        Object collection,
	        SessionImplementor session,
	        ParameterMetadata parameterMetadata) {
		super( queryString, session, parameterMetadata );
		this.collection = collection;
	}


	/**
	 * @see org.hibernate.Query#iterate()
	 */
	public Iterator iterate() throws HibernateException {
		verifyParameters();
		Map namedParams = getNamedParams();
		return getSession().iterateFilter( 
				collection, 
				expandParameterLists(namedParams),
				getQueryParameters(namedParams) 
		);
	}

	/**
	 * @see org.hibernate.Query#list()
	 */
	public List list() throws HibernateException {
		verifyParameters();
		Map namedParams = getNamedParams();
		return getSession().listFilter( 
				collection, 
				expandParameterLists(namedParams),
				getQueryParameters(namedParams) 
		);
	}

	/**
	 * @see org.hibernate.Query#scroll()
	 */
	public ScrollableResults scroll() throws HibernateException {
		throw new UnsupportedOperationException("Can't scroll filters");
	}

	public Type[] typeArray() {
		List typeList = getTypes();
		int size = typeList.size();
		Type[] result = new Type[size+1];
		for (int i=0; i<size; i++) result[i+1] = (Type) typeList.get(i);
		return result;
	}

	public Object[] valueArray() {
		List valueList = getValues();
		int size = valueList.size();
		Object[] result = new Object[size+1];
		for (int i=0; i<size; i++) result[i+1] = valueList.get(i);
		return result;
	}

}