| /* |
| * |
| * 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-"); |
| } |
| } |