/**
* Licensed to the Austrian Association for Software Tool Integration (AASTI)
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. The AASTI 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.openengsb.core.common.remote;
import java.io.IOException;
import java.util.Map;
import org.apache.commons.lang.StringUtils;
import org.openengsb.core.api.remote.FilterAction;
import org.openengsb.core.api.remote.FilterConfigurationException;
import org.openengsb.core.api.remote.FilterException;
import org.openengsb.core.api.remote.MethodCallMessage;
import org.openengsb.core.api.remote.MethodResult;
import org.openengsb.core.api.remote.MethodResult.ReturnType;
import org.openengsb.core.api.remote.MethodResultMessage;
import org.openengsb.core.util.JsonUtils;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
* This filter takes a {@link MethodCallMessage} and serializes it to JSON. The String s then passed on to the next
* filter. The returned JSON-String representing a {@link MethodResultMessage} is then deserialized and returned.
*
* <code>
* <pre>
* [MethodCallMessage] > Filter > [MethodCallMessage as JSON-string] > ...
* |
* v
* [MethodResultMessage] < Filter < [MethodResultMessage as JSON-string] < ...
* </pre>
* </code>
*/
public class JsonOutgoingMethodCallMarshalFilter extends
AbstractFilterChainElement<MethodCallMessage, MethodResultMessage> {
private FilterAction next;
@Override
public MethodResultMessage doFilter(MethodCallMessage input, Map<String, Object> metadata) throws FilterException {
ObjectMapper objectMapper = JsonUtils.createObjectMapperWithIntroSpectors();
MethodResultMessage resultMessage;
try {
String jsonString = objectMapper.writeValueAsString(input);
String resultString = (String) next.filter(jsonString, metadata);
if (resultString == null) {
return null;
}
resultMessage = objectMapper.readValue(resultString, MethodResultMessage.class);
} catch (IOException e) {
throw new FilterException(e);
}
MethodResult result = resultMessage.getResult();
if (result.getType().equals(ReturnType.Void)) {
result.setArg(null);
} else {
Class<?> resultType;
try {
resultType = Class.forName(result.getClassName());
} catch (ClassNotFoundException e) {
throw new FilterException(e);
}
Object convertedValue = objectMapper.convertValue(result.getArg(), resultType);
result.setArg(convertedValue);
}
return resultMessage;
}
public static Class<?> getAttributeType(Class<?> clazz, String attributeName) throws NoSuchMethodException {
return clazz.getMethod("get" + StringUtils.capitalize(attributeName)).getReturnType();
}
@Override
public void setNext(FilterAction next) throws FilterConfigurationException {
checkNextInputAndOutputTypes(next, String.class, String.class);
this.next = next;
}
}