/*
* 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 SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jms.selector;
import javax.jms.InvalidSelectorException;
import javax.jms.JMSException;
import javax.jms.Message;
/**
* The base selector.
*/
public class BooleanBinarySelector extends Selector {
private int _token;
private Selector _left;
private Selector _right;
BooleanBinarySelector(int token, Selector left, Selector right)
throws JMSException
{
_token = token;
_left = left;
_right = right;
switch (_token) {
case SelectorParser.LT:
case SelectorParser.LE:
case SelectorParser.GT:
case SelectorParser.GE:
if (! _left.isUnknown() && ! _left.isNumber())
throw new InvalidSelectorException(L.l("'{0}' must have a numeric value for comparison.",
this));
if (! _right.isUnknown() && ! _right.isNumber())
throw new InvalidSelectorException(L.l("'{0}' must have a numeric value for comparison.",
this));
break;
case SelectorParser.EQ:
case SelectorParser.NE:
if (_left.isUnknown() || _right.isUnknown()) {
}
else if (_left.isNumber() != _right.isNumber()) {
throw new InvalidSelectorException(L.l("'{0}' test must have matching types.",
this));
}
break;
case SelectorParser.AND:
case SelectorParser.OR:
if (! _left.isUnknown() && ! _left.isBoolean())
throw new InvalidSelectorException(L.l("'{0}' must have a numeric value for comparison.",
this));
if (! _right.isUnknown() && ! _right.isBoolean())
throw new InvalidSelectorException(L.l("'{0}' must have a numeric value for comparison.",
this));
break;
}
}
/**
* Returns true since the value is a boolean.
*/
boolean isBoolean()
{
return true;
}
/**
* Returns false, since the type is known.
*/
boolean isUnknown()
{
return false;
}
/**
* Evaluate the message. The boolean literal selector returns
* the value of the boolean.
*/
public Object evaluate(Message message)
throws JMSException
{
Object lvalue = _left.evaluate(message);
Object rvalue = _right.evaluate(message);
if (lvalue == null || rvalue == null)
return NULL;
switch (_token) {
case SelectorParser.EQ:
if (lvalue instanceof Number && rvalue instanceof Number)
return toBoolean(((Number) lvalue).doubleValue() ==
((Number) rvalue).doubleValue());
else
return toBoolean(lvalue.equals(rvalue));
case SelectorParser.NE:
if (lvalue instanceof Number && rvalue instanceof Number)
return toBoolean(! (((Number) lvalue).doubleValue() ==
((Number) rvalue).doubleValue()));
else
return toBoolean(! lvalue.equals(rvalue));
case SelectorParser.LT:
if (lvalue instanceof Number && rvalue instanceof Number)
return toBoolean(((Number) lvalue).doubleValue() <
((Number) rvalue).doubleValue());
else
return Boolean.FALSE;
case SelectorParser.LE:
if (lvalue instanceof Number && rvalue instanceof Number)
return toBoolean(((Number) lvalue).doubleValue() <=
((Number) rvalue).doubleValue());
else
return Boolean.FALSE;
case SelectorParser.GT:
if (lvalue instanceof Number && rvalue instanceof Number)
return toBoolean(((Number) lvalue).doubleValue() >
((Number) rvalue).doubleValue());
else
return Boolean.FALSE;
case SelectorParser.GE:
if (lvalue instanceof Number && rvalue instanceof Number)
return toBoolean(((Number) lvalue).doubleValue() >=
((Number) rvalue).doubleValue());
else
return Boolean.FALSE;
case SelectorParser.AND:
if (! (lvalue instanceof Boolean))
return NULL;
else if (! ((Boolean) lvalue).booleanValue())
return Boolean.FALSE;
else if (! (rvalue instanceof Boolean))
return NULL;
else if (! ((Boolean) rvalue).booleanValue())
return Boolean.FALSE;
else
return Boolean.TRUE;
case SelectorParser.OR:
if ((lvalue instanceof Boolean) && ((Boolean) lvalue).booleanValue())
return Boolean.TRUE;
else if ((rvalue instanceof Boolean) &&
((Boolean) rvalue).booleanValue())
return Boolean.TRUE;
else if (lvalue instanceof Boolean || rvalue instanceof Boolean)
return Boolean.FALSE;
else
return NULL;
default:
throw new JMSException("NOTONE");
}
}
public String toString()
{
switch (_token) {
case SelectorParser.EQ:
return _left + " = " + _right;
case SelectorParser.NE:
return _left + " <> " + _right;
case SelectorParser.LT:
return _left + " < " + _right;
case SelectorParser.LE:
return _left + " <= " + _right;
case SelectorParser.GT:
return _left + " > " + _right;
case SelectorParser.GE:
return _left + " >= " + _right;
case SelectorParser.AND:
return _left + " AND " + _right;
case SelectorParser.OR:
return _left + " OR " + _right;
default:
return super.toString();
}
}
}