| /** |
| * 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.camel.blueprint; |
| |
| import java.lang.reflect.Method; |
| import java.util.ArrayList; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Properties; |
| import java.util.Set; |
| |
| import org.apache.aries.blueprint.ExtendedBeanMetadata; |
| import org.apache.aries.blueprint.ext.AbstractPropertyPlaceholder; |
| import org.apache.camel.component.properties.DefaultPropertiesParser; |
| import org.apache.camel.component.properties.PropertiesParser; |
| import org.apache.camel.util.ObjectHelper; |
| import org.osgi.service.blueprint.container.BlueprintContainer; |
| import org.osgi.service.blueprint.reflect.ComponentMetadata; |
| |
| /** |
| * Blueprint {@link PropertiesParser} which supports looking up |
| * property placeholders from the Blueprint Property Placeholder Service. |
| * <p/> |
| * This implementation will sit on top of any existing configured |
| * {@link PropertiesParser} and will delegate to those in case Blueprint could not |
| * resolve the property. |
| */ |
| public class BlueprintPropertiesParser extends DefaultPropertiesParser { |
| |
| private final BlueprintContainer container; |
| private PropertiesParser delegate; |
| private final Set<AbstractPropertyPlaceholder> placeholders = new LinkedHashSet<AbstractPropertyPlaceholder>(); |
| private Method method; |
| |
| public BlueprintPropertiesParser(BlueprintContainer container, PropertiesParser delegate) { |
| this.container = container; |
| this.delegate = delegate; |
| } |
| |
| /** |
| * Lookup the ids of the Blueprint property placeholder services in the |
| * Blueprint container. |
| * |
| * @return the ids, will be an empty array if none found. |
| */ |
| public String[] lookupPropertyPlaceholderIds() { |
| List<String> ids = new ArrayList<String>(); |
| |
| for (String id : container.getComponentIds()) { |
| ComponentMetadata meta = container.getComponentMetadata(id); |
| if (meta instanceof ExtendedBeanMetadata) { |
| Class clazz = ((ExtendedBeanMetadata) meta).getRuntimeClass(); |
| if (clazz != null && AbstractPropertyPlaceholder.class.isAssignableFrom(clazz)) { |
| ids.add(id); |
| } |
| } |
| } |
| |
| return ids.toArray(new String[ids.size()]); |
| } |
| |
| /** |
| * Adds the given Blueprint property placeholder service with the given id |
| * |
| * @param id id of the Blueprint property placeholder service to add. |
| */ |
| public void addPropertyPlaceholder(String id) { |
| Object component = container.getComponentInstance(id); |
| |
| if (component instanceof AbstractPropertyPlaceholder) { |
| AbstractPropertyPlaceholder placeholder = (AbstractPropertyPlaceholder) component; |
| placeholders.add(placeholder); |
| |
| log.debug("Adding Blueprint PropertyPlaceholder: {}", id); |
| |
| if (method == null) { |
| try { |
| method = AbstractPropertyPlaceholder.class.getDeclaredMethod("getProperty", String.class); |
| method.setAccessible(true); |
| } catch (NoSuchMethodException e) { |
| throw new IllegalStateException("Cannot add blueprint property placeholder: " + id |
| + " as the method getProperty is not accessible", e); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public String parseProperty(String key, String value, Properties properties) { |
| log.trace("Parsing property key: {} with value: {}", key, value); |
| |
| // lookup key in blueprint and return its value |
| if (key != null) { |
| for (AbstractPropertyPlaceholder placeholder : placeholders) { |
| value = (String) ObjectHelper.invokeMethod(method, placeholder, key); |
| if (value != null) { |
| log.debug("Blueprint parsed property key: {} as value: {}", key, value); |
| break; |
| } |
| } |
| } |
| |
| if (value == null && delegate != null) { |
| // let delegate have a try since blueprint didn't resolve it |
| value = delegate.parseProperty(key, value, properties); |
| } |
| |
| log.trace("Returning parsed property key: {} as value: {}", key, value); |
| return value; |
| } |
| |
| } |