org.soulwing.prospecto.jackson.ViewDeserializer.java Source code

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Here is the source code for org.soulwing.prospecto.jackson.ViewDeserializer.java

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/*
 * File created on Apr 27, 2016
 *
 * Copyright (c) 2016 Carl Harris, Jr
 * and others as noted
 *
 * 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 org.soulwing.prospecto.jackson;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.soulwing.prospecto.ViewReaderFactoryProducer;
import org.soulwing.prospecto.api.View;
import org.soulwing.prospecto.api.ViewReaderFactory;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;

/**
 * A Jackson {@link com.fasterxml.jackson.databind.JsonDeserializer} for a
 * Prospecto {@link View}.
 *
 * @author Carl Harris
 */
public class ViewDeserializer extends StdDeserializer<View> {

    private final ViewReaderFactory readerFactory = ViewReaderFactoryProducer.getFactory("JSON");

    public ViewDeserializer() {
        super(View.class);
    }

    @Override
    public View deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
            throws IOException, JsonProcessingException {

        final JsonNode tree = jsonParser.readValueAsTree();
        final ObjectMapper mapper = new ObjectMapper();
        final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        mapper.writeValue(outputStream, tree);

        final ByteArrayInputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
        return readerFactory.newReader(inputStream).readView();
    }

}