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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 java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.log4j.Logger;
import org.apache.qpid.framing.AMQTypedValue;
import org.apache.qpid.framing.FieldTable;
/**
* Defines binding and matching based on a set of headers.
*/
class HeadersBinding
{
private static final Logger _logger = Logger.getLogger(HeadersBinding.class);
private final FieldTable _mappings;
private final Set<String> required = new HashSet<String>();
private final Map<String,Object> matches = new HashMap<String,Object>();
private boolean matchAny;
private final class MatchesOrProcessor implements FieldTable.FieldTableElementProcessor
{
private Boolean _result = Boolean.FALSE;
public boolean processElement(String propertyName, AMQTypedValue value)
{
if((value != null) && (value.getValue() != null) && value.getValue().equals(matches.get(propertyName)))
{
_result = Boolean.TRUE;
return false;
}
return true;
}
public Object getResult()
{
return _result;
}
}
private final class RequiredOrProcessor implements FieldTable.FieldTableElementProcessor
{
Boolean _result = Boolean.FALSE;
public boolean processElement(String propertyName, AMQTypedValue value)
{
if(required.contains(propertyName))
{
_result = Boolean.TRUE;
return false;
}
return true;
}
public Object getResult()
{
return _result;
}
}
/**
* 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(FieldTable mappings)
{
_mappings = mappings;
initMappings();
}
private void initMappings()
{
_mappings.processOverElements(new FieldTable.FieldTableElementProcessor()
{
public boolean processElement(String propertyName, AMQTypedValue value)
{
if (isSpecial(propertyName))
{
processSpecial(propertyName, value.getValue());
}
else if (value.getValue() == null || value.getValue().equals(""))
{
required.add(propertyName);
}
else
{
matches.put(propertyName,value.getValue());
}
return true;
}
public Object getResult()
{
return null;
}
});
}
protected FieldTable 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(FieldTable headers)
{
if(headers == null)
{
return required.isEmpty() && matches.isEmpty();
}
else
{
return matchAny ? or(headers) : and(headers);
}
}
private boolean and(FieldTable headers)
{
if(headers.keys().containsAll(required))
{
for(Map.Entry<String, Object> e : matches.entrySet())
{
if(!e.getValue().equals(headers.getObject(e.getKey())))
{
return false;
}
}
return true;
}
else
{
return false;
}
}
private boolean or(final FieldTable headers)
{
if(required.isEmpty() || !(Boolean) headers.processOverElements(new RequiredOrProcessor()))
{
return ((!matches.isEmpty()) && (Boolean) headers.processOverElements(new MatchesOrProcessor()))
|| (required.isEmpty() && matches.isEmpty());
}
else
{
return true;
}
}
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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