/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.amber.query;
import com.caucho.util.CharBuffer;
/**
* The key for a query cache entry
*/
public class QueryCacheKey {
private String _sql;
private Object []_args;
private int _startRow;
public QueryCacheKey()
{
}
public QueryCacheKey(String sql, Object []args, int startRow)
{
init(sql, args, startRow);
}
/**
* Initialize the cache key values.
*/
public void init(String sql, Object []args, int startRow)
{
_sql = sql;
_args = args;
_startRow = startRow;
}
/**
* Returns the hash code.
*/
public int hashCode()
{
int hash = _startRow;
hash = 65537 * hash + _sql.hashCode();
Object []args = _args;
for (int i = args.length - 1; i >= 0; i--) {
Object v = args[i];
if (v == null)
hash = 65537 * hash + 17;
else
hash = 65537 * hash + 17 * v.hashCode();
}
return hash;
}
/**
* Test for equality.
*/
public boolean equals(Object o)
{
if (this == o)
return true;
else if (o == null || o.getClass() != getClass())
return false;
QueryCacheKey key = (QueryCacheKey) o;
if (! _sql.equals(key._sql)) {
return false;
}
if (_startRow != key._startRow) {
return false;
}
Object []argsA = _args;
Object []argsB = key._args;
if (argsA.length != argsB.length) {
return false;
}
for (int i = argsA.length - 1; i >= 0; i--) {
Object a = argsA[i];
Object b = argsB[i];
if (a != b && (a == null || ! a.equals(b))) {
return false;
}
}
return true;
}
public String toString()
{
CharBuffer cb = new CharBuffer();
cb.append("QueryCacheKey[");
cb.append(_sql);
for (int i = 0; i < _args.length; i++) {
cb.append(",");
cb.append(_args[i]);
}
cb.append("]");
return cb.toString();
}
}