src/main/java/org/apache/ode/jacob/soup/jackson/ChannelRefSerializer.java

/*
 * 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.ode.jacob.soup.jackson;

import java.io.IOException;
import java.lang.reflect.Field;

import org.apache.ode.jacob.ChannelRef;
import org.apache.ode.jacob.ChannelRef.Type;
import org.apache.ode.jacob.Message;
import org.apache.ode.jacob.soup.CommChannel;
import org.apache.ode.jacob.soup.jackson.JacksonExecutionQueueImpl.ExecutionQueueImplSerializer;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

/**
 * Jackson serializer for {@link Message} objects.
 * 
 * @author Tammo van Lessen
 *
 */
public class ChannelRefSerializer extends StdSerializer<ChannelRef> {

    private final ExecutionQueueImplSerializer executionQueueImplSerializer;

    public ChannelRefSerializer(ExecutionQueueImplSerializer executionQueueImplSerializer) {
        super(ChannelRef.class);
        this.executionQueueImplSerializer = executionQueueImplSerializer;
    }
    
    @Override
    public void serialize(ChannelRef value, JsonGenerator jgen,
            SerializerProvider provider) throws IOException,
            JsonGenerationException {
        jgen.writeStartObject();
        serializeContents(value, jgen, provider);
        jgen.writeEndObject();
    }

    
    @Override
    public void serializeWithType(ChannelRef value, JsonGenerator jgen,
            SerializerProvider provider, TypeSerializer typeSer)
            throws IOException, JsonProcessingException {
        typeSer.writeTypePrefixForObject(value, jgen);
        serializeContents(value, jgen, provider);
        typeSer.writeTypeSuffixForObject(value, jgen);
    }
    
    private void serializeContents(ChannelRef value, JsonGenerator jgen,
            SerializerProvider provider) throws JsonGenerationException, IOException {
        
        try {
            Field targetField = ChannelRef.class.getDeclaredField("target");
            targetField.setAccessible(true);
            jgen.writeObjectField("target", targetField.get(value));
            
            if (value.getType() == Type.CHANNEL) {
                executionQueueImplSerializer.markChannelUsed(value.getEndpoint(CommChannel.class).getId());
            }
            
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }
}