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

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.Query;
import org.hibernate.ScrollMode;
import org.hibernate.ScrollableResults;
import org.hibernate.Session;
import org.hibernate.engine.QueryParameters;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.engine.TypedValue;
import org.hibernate.engine.query.ParameterMetadata;
import org.hibernate.type.Type;

/**
 * default implementation of the Query interface, for "ordinary" HQL
 * queries (not collection filters)
 * 
 * @see CollectionFilterImpl
 * @author gperrone
 */
public class QueryImpl extends AbstractQueryImpl {

	private Map lockModes = new HashMap(2);


	public QueryImpl(String queryString, FlushMode flushMode, SessionImplementor session, ParameterMetadata parameterMetadata) {
		super(queryString, flushMode, session, parameterMetadata);
	}

	public QueryImpl(String queryString, SessionImplementor session, ParameterMetadata parameterMetadata) {
		this(queryString, null, session, parameterMetadata);
	}

	public Iterator iterate() throws HibernateException {
		verifyParameters();
		Map namedParams = getNamedParams();
		before();
		try {
			return getSession().iterate(expandParameterLists(namedParams), getQueryParameters(namedParams));
		} finally {
			after();
		}
	}

	public ScrollableResults scroll() throws HibernateException {
		return scroll(ScrollMode.SCROLL_INSENSITIVE);
	}

	public ScrollableResults scroll(ScrollMode scrollMode) throws HibernateException {
		verifyParameters();
		Map namedParams = getNamedParams();
		before();
		QueryParameters qp = getQueryParameters(namedParams);
		qp.setScrollMode(scrollMode);
		try {
			return getSession().scroll(expandParameterLists(namedParams), qp);
		} finally {
			after();
		}
	}

	public List list() throws HibernateException {
		verifyParameters();
		Map namedParams = getNamedParams();
		before();
		try {
			return getSession().list(expandParameterLists(namedParams), getQueryParameters(namedParams));
		} finally {
			after();
		}
	}

	public int executeUpdate() throws HibernateException {
		verifyParameters();
		Map namedParams = getNamedParams();
		before();
		try {
			return getSession().executeUpdate(expandParameterLists(namedParams), getQueryParameters(namedParams));
		} finally {
			after();
		}
	}

	public Query setLockMode(String alias, LockMode lockMode) {
		lockModes.put(alias, lockMode);
		return this;
	}

	protected Map getLockModes() {
		return lockModes;
	}

	/**
	 * TODO documentation
	 * 
	 * @return
	 */
	public int count() {
		StringBuffer hqlQuery = new StringBuffer(this.getQueryString().toUpperCase());
		StringBuffer hqlQueryBuffer = new StringBuffer();
		hqlQueryBuffer.append("SELECT COUNT(*) ");
		int start = hqlQuery.indexOf("FROM");
		int stop = hqlQuery.indexOf("ORDER BY");
		if (stop >= 0) {
			hqlQueryBuffer.append(this.getQueryString().substring(start, stop));
		} else {
			hqlQueryBuffer.append(this.getQueryString().substring(start));
		}
		Query countQuery = ((Session)this.session).createQuery(hqlQueryBuffer.toString());
		// SET NAMED PARAMS
		Map parameters = this.getNamedParams();
		Set parameterNames = parameters.keySet();
		Iterator iter = parameterNames.iterator();
		while (iter.hasNext()) {
			String name = (String)iter.next();
			TypedValue typedValue = (TypedValue)parameters.get(name);
			countQuery.setParameter(name, typedValue.getValue(), typedValue.getType());
		}
		// SET POSITIONAL PARAMS
		List paramTypes = this.getTypes();
		List paramValues = this.getValues();
		if (paramTypes != null && paramTypes.size() > 0) {
			for (int i = 0; i < paramTypes.size(); i++) {
				countQuery.setParameter(i, paramValues.get(i), (Type)paramTypes.get(i));
			}
		}
		int count = ((Long)countQuery.uniqueResult()).intValue();
		return count;
	}
}