001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.blueprint; 018 019import java.util.Properties; 020 021import org.apache.camel.CamelContext; 022import org.apache.camel.component.properties.PropertiesResolver; 023import org.apache.camel.util.ObjectHelper; 024 025/** 026 * A {@link PropertiesResolver} which supports the <tt>blueprint</tt> scheme. 027 * <p/> 028 * This implementation will sit on top of any existing configured 029 * {@link org.apache.camel.component.properties.PropertiesResolver} and will delegate 030 * to any non <tt>blueprint</tt> schemes. 031 */ 032public class BlueprintPropertiesResolver implements PropertiesResolver { 033 034 private final PropertiesResolver delegate; 035 private final BlueprintPropertiesParser blueprint; 036 037 public BlueprintPropertiesResolver(PropertiesResolver delegate, BlueprintPropertiesParser blueprint) { 038 this.delegate = delegate; 039 this.blueprint = blueprint; 040 } 041 042 @Override 043 public Properties resolveProperties(CamelContext context, boolean ignoreMissingLocation, String... urls) throws Exception { 044 Properties answer = new Properties(); 045 046 boolean explicit = false; 047 048 for (String url : urls) { 049 if (url.startsWith("blueprint:")) { 050 String ref = ObjectHelper.after(url, "blueprint:"); 051 blueprint.addPropertyPlaceholder(ref); 052 // indicate an explicit blueprint id was configured 053 explicit = true; 054 } else { 055 // delegate the url 056 answer.putAll(delegate.resolveProperties(context, ignoreMissingLocation, url)); 057 } 058 } 059 060 if (!explicit) { 061 // auto lookup blueprint property placeholders to use if none explicit was configured 062 // this is convention over configuration 063 String[] ids = blueprint.lookupPropertyPlaceholderIds(); 064 for (String id : ids) { 065 blueprint.addPropertyPlaceholder(id); 066 } 067 } 068 069 return answer; 070 } 071 072}