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/*
*
* 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.
*
*/
package org.apache.qpid.server.exchange;
import org.apache.log4j.Logger;
import java.util.Collections;
import java.util.Map;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
/**
* Defines binding and matching based on a set of headers.
*/
class HeadersBinding
{
private static final Logger _logger = Logger.getLogger(HeadersBinding.class);
private final Map _mappings = new HashMap();
private final Set<Object> required = new HashSet<Object>();
private final Set<Map.Entry> matches = new HashSet<Map.Entry>();
private boolean matchAny;
/**
* Creates a binding for a set of mappings. Those mappings whose value is
* null or the empty string are assumed only to be required headers, with
* no constraint on the value. Those with a non-null value are assumed to
* define a required match of value.
* @param mappings the defined mappings this binding should use
*/
HeadersBinding(Map mappings)
{
//noinspection unchecked
this(mappings == null ? new HashSet<Map.Entry>() : mappings.entrySet());
_mappings.putAll(mappings);
}
private HeadersBinding(Set<Map.Entry> entries)
{
for (Map.Entry e : entries)
{
if (isSpecial(e.getKey()))
{
processSpecial((String) e.getKey(), e.getValue());
}
else if (e.getValue() == null || e.getValue().equals(""))
{
required.add(e.getKey());
}
else
{
matches.add(e);
}
}
}
protected Map getMappings()
{
return _mappings;
}
/**
* Checks whether the supplied headers match the requirements of this binding
* @param headers the headers to check
* @return true if the headers define any required keys and match any required
* values
*/
public boolean matches(Map headers)
{
if(headers == null)
{
return required.isEmpty() && matches.isEmpty();
}
else
{
return matchAny ? or(headers) : and(headers);
}
}
private boolean and(Map headers)
{
//need to match all the defined mapping rules:
return headers.keySet().containsAll(required)
&& headers.entrySet().containsAll(matches);
}
private boolean or(Map headers)
{
//only need to match one mapping rule:
return !Collections.disjoint(headers.keySet(), required)
|| !Collections.disjoint(headers.entrySet(), matches);
}
private void processSpecial(String key, Object value)
{
if("X-match".equalsIgnoreCase(key))
{
matchAny = isAny(value);
}
else
{
_logger.warn("Ignoring special header: " + key);
}
}
private boolean isAny(Object value)
{
if(value instanceof String)
{
if("any".equalsIgnoreCase((String) value)) return true;
if("all".equalsIgnoreCase((String) value)) return false;
}
_logger.warn("Ignoring unrecognised match type: " + value);
return false;//default to all
}
static boolean isSpecial(Object key)
{
return key instanceof String && isSpecial((String) key);
}
static boolean isSpecial(String key)
{
return key.startsWith("X-") || key.startsWith("x-");
}
}
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