querykey.java

用Java实现的23个常用设计模式源代码

//$Id: QueryKey.java,v 1.1.2.5 2003/11/07 06:39:25 oneovthafew Exp $
package net.sf.hibernate.cache;

import java.io.Serializable;
import java.util.Iterator;
import java.util.Map;

import net.sf.hibernate.HibernateException;
import net.sf.hibernate.engine.QueryParameters;
import net.sf.hibernate.engine.RowSelection;
import net.sf.hibernate.engine.TypedValue;
import net.sf.hibernate.type.Type;
import net.sf.hibernate.util.EqualsHelper;

/**
 * @author Gavin King
 */
public class QueryKey implements Serializable {
	private final String hqlQueryString;
	private final Type[] types;
	private final Object[] values;
	private final Integer firstRow;
	private final Integer maxRows;
	private final Map namedParameters;
	
	public QueryKey(String queryString, QueryParameters queryParameters) {
		this.hqlQueryString = queryString;
		this.types = queryParameters.getPositionalParameterTypes();
		this.values = queryParameters.getPositionalParameterValues();
		RowSelection selection = queryParameters.getRowSelection();
		if (selection!=null) {
			firstRow = selection.getFirstRow();
			maxRows = selection.getMaxRows();
		}
		else {
			firstRow = null;
			maxRows = null;
		}
		this.namedParameters = queryParameters.getNamedParameters();
	}
	
	public boolean equals(Object other) {
		QueryKey that = (QueryKey) other;
		if ( !hqlQueryString.equals(that.hqlQueryString) ) return false;
		if ( !EqualsHelper.equals(firstRow, that.firstRow) || !EqualsHelper.equals(maxRows, that.maxRows) ) return false;
		if (types==null) {
			if (that.types!=null) return false;
		}
		else {
			if (that.types==null) return false;
			if ( types.length!=that.types.length ) return false;
			for ( int i=0; i<types.length; i++ ) {
				if ( !types[i].equals( that.types[i] ) ) return false;
				try {
					if ( !types[i].equals( values[i], that.values[i] ) ) return false;
				}
				catch (HibernateException he) {
					return false;
				}
			}
		}
		if (namedParameters==null) {
			if (that.namedParameters!=null) return false;
		}
		else {
			if (that.namedParameters==null) return false;
			if ( namedParameters.size()!=that.namedParameters.size() ) return false;
			Iterator iter = namedParameters.entrySet().iterator();
			while ( iter.hasNext() ) {
				Map.Entry me = (Map.Entry) iter.next();
				TypedValue thisTv = (TypedValue) me.getValue();
				TypedValue thatTv = (TypedValue) that.namedParameters.get( me.getKey() );
				if (thatTv==null) return false;
				if ( !thatTv.getType().equals( thisTv.getType() ) ) return false;
				try {
					if ( !thisTv.getType().equals( thisTv.getValue(), thatTv.getValue() ) ) return false;
				}
				catch (HibernateException he) {
					return false;
				}
			}
		}
		return true;
	}
	
	public int hashCode() {
		return hqlQueryString.hashCode(); //TODO: VERY inefficient!!!!
	}
}