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.Collections;
  21 import java.util.HashMap;
  22 import java.util.List;
  23 import java.util.Map;
  24
  25 public class DefaultScope implements Scope {
  26
  27         private List<Scope> parents;
  28         private Map<String, Object> properties;
  29         private Map<String, Object> runtimes;
  30         private Map<ProvidedInterface, ProvidedInterfaceImplementation> provided;
  31         private List<ProvidedInterface> externallyProvided;
  32
  33         public DefaultScope(List<ProvidedInterface>aExternallyProvided) {
  34             this(aExternallyProvided.toArray(new ProvidedInterface[0]));
  35         }
  36
  37         public DefaultScope(ProvidedInterface[] aExternallyProvided) {
  38                 this(aExternallyProvided, new ArrayList<Scope>());
  39         }
  40
  41         public DefaultScope(ProvidedInterface[] aExternallyProvided, Scope aParent) {
  42                 this(aExternallyProvided, Arrays.asList(new Scope[] { aParent }));
  43         }
  44
  45         public DefaultScope(ProvidedInterface[] aExternallyProvided,
  46                         List<Scope> aParent) {
  47                 parents = new ArrayList<Scope>(aParent);
  48                 properties = new HashMap<String, Object>();
  49                 runtimes = new HashMap<String, Object>();
  50                 provided = new HashMap<ProvidedInterface, ProvidedInterfaceImplementation>();
  51                 externallyProvided = new ArrayList<ProvidedInterface>();
  52                 externallyProvided.addAll(Arrays.asList(aExternallyProvided));
  53         }
  54
  55         @Override
  56         public List<ProvidedInterface> getProvidedInterfaces() {
  57                 return Collections.unmodifiableList(externallyProvided);
  58         }
  59
  60         @Override
  61         public Object get(String aKey) {
  62                 return properties.get(aKey);
  63         }
  64
  65         @Override
  66         public void put(String aKey, Object aValue) {
  67                 properties.put(aKey, aValue);
  68         }
  69
  70         @Override
  71         public void addRuntime(Component aComponent, Object aRuntime) {
  72                 runtimes.put(aComponent.getName(), aRuntime);
  73         }
  74
  75         @Override
  76         public Object getRuntime(Component aComponent) {
  77                 return runtimes.get(aComponent.getName());
  78         }
  79
  80         @Override
  81         public Object getRuntime(String aName) {
  82             return runtimes.get(aName);
  83         }
  84
  85         @Override
  86         synchronized public void publishInterface(ProvidedInterface aInterface,
  87                         Object aImplementation) {
  88                 provided.put(aInterface, new ProvidedInterfaceImplementation(aInterface,
  89                                 aImplementation));
  90         }
  91
  92         @Override
  93         public <T> T getInterfaceImplementation(ProvidedInterface aInterface,
  94                         Class<T> aType) {
  95                 if ( aInterface == null ) {
  96                         return null;
  97                 }
  98                 ProvidedInterfaceImplementation providedIntf = provided.get(aInterface);
  99                 if (providedIntf == null) {
 100                         for (Scope parent : parents) {
 101                                 T impl = parent.getInterfaceImplementation(aInterface, aType);
 102                                 if ( impl != null ) {
 103                                         return impl;
 104                                 }
 105                         }
 106                         return null;
 107                 } else {
 108                         return providedIntf.getImplementation(aType);
 109                 }
 110         }
 111 }