com.github.marcosalis.kraken.utils.json.ListToArraySerializer.java Source code

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Here is the source code for com.github.marcosalis.kraken.utils.json.ListToArraySerializer.java

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/*
 * Copyright 2013 Marco Salis - fast3r(at)gmail.com
 *
 * Licensed 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 com.github.marcosalis.kraken.utils.json;

import java.io.IOException;
import java.util.List;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.google.common.annotations.Beta;

/**
 * Abstract generic {@link JsonSerializer} that serializes a list to a JSON
 * array.
 * 
 * @since 1.0
 * @author Marco Salis
 * 
 * @param <M>
 *            The model object type
 */
@Beta
public abstract class ListToArraySerializer<M> extends JsonSerializer<List<M>> {
    @Override
    public void serialize(List<M> value, JsonGenerator jgen, SerializerProvider provider)
            throws IOException, JsonProcessingException {
        if (value != null) {
            jgen.writeStartArray();
            for (M model : value) {
                jgen.writeObject(model);
            }
            jgen.writeEndArray();

        } else { // write empty array
            jgen.writeStartArray();
            jgen.writeEndArray();
        }
    }

}