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     */
017    package org.apache.camel.impl;
018    
019    import org.apache.camel.CamelContext;
020    import org.apache.camel.NoFactoryAvailableException;
021    import org.apache.camel.model.DataFormatDefinition;
022    import org.apache.camel.spi.DataFormat;
023    import org.apache.camel.spi.DataFormatResolver;
024    import org.apache.camel.spi.FactoryFinder;
025    
026    /**
027     * Default data format resolver
028     *
029     * @version $Revision: 835732 $
030     */
031    public class DefaultDataFormatResolver implements DataFormatResolver {
032    
033        public static final String DATAFORMAT_RESOURCE_PATH = "META-INF/services/org/apache/camel/dataformat/";
034    
035        protected FactoryFinder dataformatFactory;
036    
037        public DataFormat resolveDataFormat(String name, CamelContext context) {
038            DataFormat dataFormat = lookup(context, name, DataFormat.class);
039            if (dataFormat == null) {
040                Class<?> type = null;
041                try {
042                    if (dataformatFactory == null) {
043                        dataformatFactory = context.getFactoryFinder(DATAFORMAT_RESOURCE_PATH);
044                    }
045                    type = dataformatFactory.findClass(name);
046                } catch (NoFactoryAvailableException e) {
047                    // ignore
048                } catch (Exception e) {
049                    throw new IllegalArgumentException("Invalid URI, no DataFormat registered for scheme: " + name, e);
050                }
051    
052                if (type == null) {
053                    type = context.getClassResolver().resolveClass(name);
054                }
055    
056                if (type != null) {
057                    if (DataFormat.class.isAssignableFrom(type)) {
058                        dataFormat = (DataFormat) context.getInjector().newInstance(type);
059                    } else {
060                        throw new IllegalArgumentException("Resolving dataformat: " + name + " detected type conflict: Not a DataFormat implementation. Found: " + type.getName());
061                    }
062                }
063            }
064    
065            return dataFormat;
066        }
067    
068        public DataFormatDefinition resolveDataFormatDefinition(String name, CamelContext context) {
069            // lookup type and create the data format from it
070            DataFormatDefinition type = lookup(context, name, DataFormatDefinition.class);
071            if (type == null && context.getDataFormats() != null) {
072                type = context.getDataFormats().get(name);
073            }
074            return type;
075        }
076    
077        private static <T> T lookup(CamelContext context, String ref, Class<T> type) {
078            try {
079                return context.getRegistry().lookup(ref, type);
080            } catch (Exception e) {
081                // need to ignore not same type and return it as null
082                return null;
083            }
084        }
085    }