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.model.transformer;
018
019import javax.xml.bind.annotation.XmlAccessType;
020import javax.xml.bind.annotation.XmlAccessorType;
021import javax.xml.bind.annotation.XmlAttribute;
022import javax.xml.bind.annotation.XmlType;
023
024import org.apache.camel.CamelContext;
025import org.apache.camel.spi.Metadata;
026import org.apache.camel.spi.Transformer;
027
028/**
029 * Represents a CustomTransformer. One of the bean reference (ref) or fully qualified class name (type)
030 * of the custom {@link Transformer} needs to be specified.
031 * 
032 * {@see TransformerDefinition}
033 * {@see Transformer}
034 */
035@Metadata(label = "transformation")
036@XmlType(name = "customTransformer")
037@XmlAccessorType(XmlAccessType.FIELD)
038public class CustomTransformerDefinition extends TransformerDefinition {
039
040    @XmlAttribute
041    private String ref;
042    @XmlAttribute
043    private String className;
044
045    @Override
046    protected Transformer doCreateTransformer(CamelContext context) throws Exception {
047        if (ref == null && className == null) {
048            throw new IllegalArgumentException("'ref' or 'className' must be specified for customTransformer");
049        }
050        Transformer transformer;
051        if (ref != null) {
052            transformer = context.getRegistry().lookupByNameAndType(ref, Transformer.class);
053            if (transformer == null) {
054                throw new IllegalArgumentException("Cannot find transformer with ref:" + ref);
055            }
056            if (transformer.getModel() != null || transformer.getFrom() != null || transformer.getTo() != null) {
057                throw new IllegalArgumentException(String.format("Transformer '%s' is already in use. Please check if duplicate transformer exists.", ref));
058            }
059        } else {
060            Class<Transformer> transformerClass = context.getClassResolver().resolveMandatoryClass(className, Transformer.class);
061            if (transformerClass == null) {
062                throw new IllegalArgumentException("Cannot find transformer class: " + className);
063            }
064            transformer = context.getInjector().newInstance(transformerClass);
065
066        }
067        transformer.setCamelContext(context);
068        return transformer.setModel(getScheme())
069                          .setFrom(getFromType())
070                          .setTo(getToType());
071    }
072
073    public String getRef() {
074        return ref;
075    }
076
077    /**
078     * Set a bean reference of the {@link Transformer}
079     *
080     * @param ref the bean reference of the Transformer
081     */
082    public void setRef(String ref) {
083        this.ref = ref;
084    }
085
086    public String getClassName() {
087        return className;
088    }
089
090    /**
091     * Set a class name of the {@link Transformer}
092     *
093     * @param className the class name of the Transformer
094     */
095    public void setClassName(String className) {
096        this.className = className;
097    }
098
099}
100