[GitHub] [sling-org-apache-sling-models-impl] schaefa commented on a change in pull request #14: SLING-8655 - Updated dependency on API, provided Externalized Path In…

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schaefa commented on a change in pull request #14: SLING-8655 - Updated dependency on API, provided Externalized Path In…
URL: https://github.com/apache/sling-org-apache-sling-models-impl/pull/14#discussion_r317823448
 
 

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 File path: src/main/java/org/apache/sling/models/impl/injectors/ExternalizedPathInjector.java
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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.sling.models.impl.injectors;
+
+import org.apache.commons.lang3.ObjectUtils;
+import org.apache.sling.api.resource.ResourceResolver;
+import org.apache.sling.api.resource.ValueMap;
+import org.apache.sling.models.annotations.ExternalizePath;
+import org.apache.sling.models.annotations.injectorspecific.ExternalizedPathProvider;
+import org.apache.sling.models.spi.DisposalCallbackRegistry;
+import org.apache.sling.models.spi.Injector;
+import org.jetbrains.annotations.NotNull;
+import org.osgi.framework.Constants;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
+import org.osgi.service.component.annotations.ReferencePolicy;
+
+import java.lang.reflect.AnnotatedElement;
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+@Component(
+    property=Constants.SERVICE_RANKING+":Integer=1000",
+    service={
+        Injector.class
+    }
+)
+public class ExternalizedPathInjector
+    extends AbstractInjector
+    implements Injector
+{
+    List<ExternalizedPathProvider> providerList = new ArrayList<>();
+
+    @Reference(policy = ReferencePolicy.DYNAMIC, cardinality = ReferenceCardinality.OPTIONAL)
+    void bindExternalizedPathProvider(ExternalizedPathProvider provider) {
+        providerList.add(provider);
+        // The providers are sorted so that the one with the highest priority is the first entry
+        Collections.sort(
+            providerList,
+            Comparator.comparingInt(ExternalizedPathProvider::getPriority).reversed()
+        );
+    }
+
+    void unbindExternalizedPathProvider(ExternalizedPathProvider provider) {
+        providerList.remove(provider);
+    }
+
+    public ExternalizedPathInjector() {
+        bindExternalizedPathProvider(new DefaultExternalizedPathProvider());
+    }
+
+    @Override
+    public @NotNull String getName() {
+        return "externalize-path";
+    }
+
+    @Override
+    public Object getValue(@NotNull Object adaptable, String name, @NotNull Type type, @NotNull AnnotatedElement element,
+            @NotNull DisposalCallbackRegistry callbackRegistry) {
+        if (adaptable == ObjectUtils.NULL) {
+            return null;
+        }
+        if (element.isAnnotationPresent(ExternalizePath.class)) {
+            ValueMap properties = getValueMap(adaptable);
+            if(properties != ObjectUtils.NULL) {
+                String imagePath = properties.get(name, String.class);
+                if(imagePath != null) {
+                    ExternalizedPathProvider provider = providerList.get(0);
+                    return provider.externalize(adaptable, imagePath);
+                }
+            }
+        }
+        return null;
+    }
+
+    /** Fallback Implementation of the Externalized Path Provider that uses the Resource Resolver's map function **/
+    private class DefaultExternalizedPathProvider
 
 Review comment:
   Moved this to be an regular OSGi Component

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