| /******************************************************************************* |
| * 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.scripting.sightly.impl.engine.extension.use; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.ListIterator; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentSkipListMap; |
| |
| import javax.script.Bindings; |
| import javax.script.SimpleBindings; |
| |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.sling.scripting.sightly.SightlyException; |
| import org.apache.sling.scripting.sightly.extension.RuntimeExtension; |
| import org.apache.sling.scripting.sightly.impl.engine.extension.ExtensionUtils; |
| import org.apache.sling.scripting.sightly.render.RenderContext; |
| import org.apache.sling.scripting.sightly.render.RuntimeObjectModel; |
| import org.apache.sling.scripting.sightly.use.ProviderOutcome; |
| import org.apache.sling.scripting.sightly.use.UseProvider; |
| import org.osgi.framework.ServiceReference; |
| 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; |
| |
| /** |
| * Runtime extension for the USE plugin |
| */ |
| @Component( |
| service = RuntimeExtension.class, |
| property = { |
| RuntimeExtension.NAME + "=" + RuntimeExtension.USE |
| } |
| ) |
| public class UseRuntimeExtension implements RuntimeExtension { |
| |
| private final Map<ServiceReference, UseProvider> providersMap = new ConcurrentSkipListMap<>(); |
| |
| @Override |
| public Object call(final RenderContext renderContext, Object... arguments) { |
| ExtensionUtils.checkArgumentCount(RuntimeExtension.USE, arguments, 2); |
| RuntimeObjectModel runtimeObjectModel = renderContext.getObjectModel(); |
| String identifier = runtimeObjectModel.toString(arguments[0]); |
| if (StringUtils.isEmpty(identifier)) { |
| throw new SightlyException("data-sly-use needs to be passed an identifier"); |
| } |
| Map<String, Object> useArgumentsMap = runtimeObjectModel.toMap(arguments[1]); |
| Bindings useArguments = new SimpleBindings(Collections.unmodifiableMap(useArgumentsMap)); |
| ArrayList<UseProvider> providers = new ArrayList<>(providersMap.values()); |
| ListIterator<UseProvider> iterator = providers.listIterator(providers.size()); |
| while (iterator.hasPrevious()) { |
| UseProvider provider = iterator.previous(); |
| ProviderOutcome outcome = provider.provide(identifier, renderContext, useArguments); |
| Throwable failureCause; |
| if (outcome.isSuccess()) { |
| return outcome.getResult(); |
| } else if ((failureCause = outcome.getCause()) != null) { |
| throw new SightlyException("Identifier " + identifier + " cannot be correctly instantiated by the Use API", failureCause); |
| } |
| } |
| throw new SightlyException("No use provider could resolve identifier " + identifier); |
| } |
| |
| // OSGi ################################################################################################################################ |
| @Reference( |
| policy = ReferencePolicy.DYNAMIC, |
| service = UseProvider.class, |
| cardinality = ReferenceCardinality.MULTIPLE |
| ) |
| private void bindUseProvider(ServiceReference<UseProvider> serviceReference, UseProvider provider) { |
| providersMap.put(serviceReference, provider); |
| } |
| |
| private void unbindUseProvider(ServiceReference serviceReference) { |
| providersMap.remove(serviceReference); |
| } |
| } |