/*
* 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.brooklyn.rest.util.json;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.map.SerializerProvider;
import org.codehaus.jackson.map.ser.std.SerializerBase;
import com.google.common.annotations.Beta;
import com.google.common.collect.Lists;
import com.google.common.collect.Multimap;
/**
* Provides a serializer for {@link Multimap} instances.
* <p>
* When Brooklyn's Jackson dependency is updated from org.codehaus.jackson:1.9.13 to
* com.fasterxml.jackson:2.3+ then this class should be replaced with a dependency on
* jackson-datatype-guava and a GuavaModule registered with Brooklyn's ObjectMapper.
*/
@Beta
public class MultimapSerializer extends SerializerBase<Multimap<?, ?>> {
@SuppressWarnings({ "unchecked", "rawtypes" })
protected MultimapSerializer() {
super((Class<Multimap<?, ?>>) (Class) Multimap.class);
}
@Override
public void serialize(Multimap<?, ?> value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
jgen.writeStartObject();
writeEntries(value, jgen, provider);
jgen.writeEndObject();
}
private void writeEntries(Multimap<?, ?> value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
for (Map.Entry<?, ? extends Collection<?>> entry : value.asMap().entrySet()) {
provider.findKeySerializer(provider.constructType(String.class), null)
.serialize(entry.getKey(), jgen, provider);
provider.defaultSerializeValue(Lists.newArrayList(entry.getValue()), jgen);
}
}
}