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#ifndef QPID_BROKER_SELECTOR_H
#define QPID_BROKER_SELECTOR_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "qpid/broker/BrokerImportExport.h"
#include <string>
#include <boost/scoped_ptr.hpp>
#include <boost/shared_ptr.hpp>
namespace qpid {
namespace broker {
class Message;
class Value;
class TopExpression;
/**
* Interface to provide values to a Selector evaluation
*/
class SelectorEnv {
public:
virtual ~SelectorEnv() {};
virtual const Value& value(const std::string&) const = 0;
};
class Selector {
boost::scoped_ptr<TopExpression> parse;
const std::string expression;
public:
QPID_BROKER_EXTERN Selector(const std::string&);
QPID_BROKER_EXTERN ~Selector();
/**
* Evaluate parsed expression with a given environment
*/
QPID_BROKER_EXTERN bool eval(const SelectorEnv& env);
/**
* Apply selector to message
* @param msg message to filter against selector
* @return true if msg meets the selector specification
*/
QPID_BROKER_EXTERN bool filter(const Message& msg);
};
/**
* Return a Selector as specified by the string:
* - Structured like this so that we can move to caching Selectors with the same
* specifications and just returning an existing one
*/
boost::shared_ptr<Selector> returnSelector(const std::string&);
}}
#endif
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