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Add contract based type awareness and transformer which leverages the…
… type metadata
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| /** | ||
| * 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.impl.transformer; | ||
|
|
||
| import java.io.InputStream; | ||
| import java.io.OutputStream; | ||
|
|
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| import org.apache.camel.CamelContext; | ||
| import org.apache.camel.Exchange; | ||
| import org.apache.camel.Message; | ||
| import org.apache.camel.converter.stream.OutputStreamBuilder; | ||
| import org.apache.camel.model.DataFormatDefinition; | ||
| import org.apache.camel.model.transformer.DataFormatTransformerDefinition; | ||
| import org.apache.camel.spi.DataFormat; | ||
| import org.apache.camel.spi.DataType; | ||
| import org.apache.camel.spi.Transformer; | ||
|
|
||
| /** | ||
| * A <a href="http://camel.apache.org/transformer.html">Transformer</a> | ||
| * leverages DataFormat to perform transformation. | ||
| */ | ||
| public class DataFormatTransformer extends Transformer { | ||
|
|
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| private String dataFormatRef; | ||
|
|
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| /** | ||
| * Perform data transformation with specified from/to type using DataFormat. | ||
| * @param message message to apply transformation | ||
| * @param from 'from' data type | ||
| * @param to 'to' data type | ||
| */ | ||
| @Override | ||
| public void transform(Message message, DataType from, DataType to) throws Exception { | ||
| Exchange exchange = message.getExchange(); | ||
| CamelContext context = exchange.getContext(); | ||
| DataFormat dataFormat = DataFormatDefinition.getDataFormat( | ||
| exchange.getUnitOfWork().getRouteContext(), null, dataFormatRef); | ||
|
|
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| // Unmarshalling into Java Object | ||
| if (to.isJavaType() && (from.equals(getFrom()) || from.getModel().equals(getModel()))) { | ||
| Object answer = dataFormat.unmarshal(exchange, message.getBody(InputStream.class)); | ||
| Class<?> toClass = context.getClassResolver().resolveClass(to.getName()); | ||
| if (!toClass.isAssignableFrom(answer.getClass())) { | ||
| answer = context.getTypeConverter().mandatoryConvertTo(toClass, answer); | ||
| } | ||
| message.setBody(answer); | ||
|
|
||
| // Marshalling from Java Object | ||
| } else if (from.isJavaType() && (to.equals(getTo()) || to.getModel().equals(getModel()))) { | ||
| Object input = message.getBody(); | ||
| Class<?> fromClass = context.getClassResolver().resolveClass(from.getName()); | ||
| if (!fromClass.isAssignableFrom(input.getClass())) { | ||
| input = context.getTypeConverter().mandatoryConvertTo(fromClass, input); | ||
| } | ||
| OutputStreamBuilder osb = OutputStreamBuilder.withExchange(exchange); | ||
| dataFormat.marshal(exchange, message.getBody(), osb); | ||
| message.setBody(osb.build()); | ||
|
|
||
| } else { | ||
| throw new IllegalArgumentException("Unsupported transformation: from='" + from + ", to='" + to + "'"); | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Set DataFormat ref. | ||
| * @param ref DataFormat ref | ||
| * @return this DataFormatTransformer instance | ||
| */ | ||
| public DataFormatTransformer setDataFormatRef(String ref) { | ||
| this.dataFormatRef = ref; | ||
| return this; | ||
| } | ||
| } |
Oops, something went wrong.
In case of Exception, you put the transformer (which is null) in the map even if it has not been initialized?