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[utils] / test / enterprise / src / main / java / org / wamblee / test / inject / Binding.java

diff --git a/test/enterprise/src/main/java/org/wamblee/test/inject/Binding.java b/test/enterprise/src/main/java/org/wamblee/test/inject/Binding.java
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+/*
+ * Copyright 2005-2010 the original author or authors.
+ * 
+ * Licensed 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.wamblee.test.inject;
+
+import java.lang.annotation.Annotation;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.wamblee.reflection.Accessor;
+import org.wamblee.reflection.AnnotationUtils;
+
+/**
+ * This class represents an injection binding. It provides injection of a defined object (typically mock or stub)
+ * into other objects. The binding is defined by the required annotation that must be on the field, the field type, 
+ * and the object to be injected. 
+ * 
+ * @author Erik Brakkee
+ *
+ * @param <T>
+ */
+public class Binding<T> {
+    private Class<T> clazz;
+    private Class<? extends Annotation> annotation;
+    private Object value;
+    private Map<Class, List<Accessor>> accessorCache;
+
+    /**
+     * Constructs the binding. 
+     * @param aClass Required type of the field injected into. 
+     * @param aAnnotation Annotation that must be present on the field.
+     * @param aValue Value of the annotation. 
+     */
+    public Binding(Class<T> aClass, Class<? extends Annotation> aAnnotation,
+        Object aValue) {
+        clazz = aClass;
+        annotation = aAnnotation;
+        value = aValue;
+        accessorCache = new ConcurrentHashMap<Class, List<Accessor>>();
+    }
+
+    public void inject(Object aObject) {
+        List<Accessor> accessors = getAccessors(aObject);
+        for (Accessor accessor : accessors) {
+            if (clazz.isAssignableFrom(accessor.getType())) {
+                accessor.set(aObject, value);
+            }
+        }
+    }
+
+    private List<Accessor> getAccessors(Object aObject) {
+        Class type = aObject.getClass();
+        List<Accessor> accessors = accessorCache.get(type);
+        if (accessors == null) {
+            accessors = AnnotationUtils.analyse(aObject.getClass(), annotation);
+            accessorCache.put(type, accessors);
+        }
+        return accessors;
+    }
+}