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