wamblee.org Git - utils/blob - system/general/src/main/java/org/wamblee/system/core/DefaultScope.java

   1 /*
   2  * Copyright 2008 the original author or authors.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.wamblee.system.core;
  17
  18 import java.util.ArrayList;
  19 import java.util.Arrays;
  20 import java.util.List;
  21 import java.util.Map;
  22 import java.util.TreeMap;
  23
  24 public class DefaultScope implements Scope {
  25
  26         private List<Scope> _parents;
  27         private int _count;
  28         private Map<String, Object> _properties;
  29         private Map<String, Object> _runtimes;
  30         private Map<String, ProvidedInterfaceImplementation> _provided;
  31         private ProvidedInterface[] _externallyProvided;
  32
  33         public DefaultScope(ProvidedInterface[] aExternallyProvided) {
  34                 this(aExternallyProvided, new ArrayList<Scope>());
  35         }
  36
  37         public DefaultScope(ProvidedInterface[] aExternallyProvided, Scope aParent) {
  38                 this(aExternallyProvided, Arrays.asList(new Scope[] { aParent }));
  39         }
  40
  41         public DefaultScope(ProvidedInterface[] aExternallyProvided,
  42                         List<Scope> aParent) {
  43                 _parents = new ArrayList<Scope>(aParent);
  44                 _count = 0;
  45                 _properties = new TreeMap<String, Object>();
  46                 _runtimes = new TreeMap<String, Object>();
  47                 _provided = new TreeMap<String, ProvidedInterfaceImplementation>();
  48                 _externallyProvided = aExternallyProvided;
  49         }
  50
  51         @Override
  52         public ProvidedInterface[] getProvidedInterfaces() {
  53                 return _externallyProvided;
  54         }
  55
  56         @Override
  57         public Object get(String aKey) {
  58                 return _properties.get(aKey);
  59         }
  60
  61         @Override
  62         public void put(String aKey, Object aValue) {
  63                 _properties.put(aKey, aValue);
  64         }
  65
  66         @Override
  67         public void addRuntime(Component aComponent, Object aRuntime) {
  68                 _runtimes.put(aComponent.getQualifiedName(), aRuntime);
  69         }
  70
  71         @Override
  72         public Object getRuntime(Component aComponent) {
  73                 return _runtimes.get(aComponent.getQualifiedName());
  74         }
  75
  76         @Override
  77         synchronized public void publishInterface(ProvidedInterface aInterface,
  78                         Object aImplementation) {
  79                 String id = "" + _count++;
  80                 _provided.put(id, new ProvidedInterfaceImplementation(aInterface,
  81                                 aImplementation));
  82                 aInterface.setUniqueId(id);
  83         }
  84
  85         @Override
  86         public <T> T retrieveInterfaceImplementation(ProvidedInterface aInterface,
  87                         Class<T> aType) {
  88                 if ( aInterface == null ) {
  89                         return null;
  90                 }
  91                 String id = aInterface.getUniqueId();
  92                 if ( id == null ) {
  93                         // optional interface that was not published.
  94                         return null;
  95                 }
  96                 ProvidedInterfaceImplementation provided = _provided.get(id);
  97                 if (provided == null) {
  98                         for (Scope parent : _parents) {
  99                                 T impl = parent.retrieveInterfaceImplementation(aInterface, aType);
 100                                 if ( impl != null ) {
 101                                         return impl;
 102                                 }
 103                         }
 104                         return null;
 105                 } else {
 106                         return provided.getImplementation(aType);
 107                 }
 108         }
 109 }