com.qubole.qds.sdk.java.entities.SubCommandsDeserializer Maven / Gradle / Ivy

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A Java library that provides the tools you need to authenticate with, and use the Qubole Data Service API.

There is a newer version: 1.3.0

/**
 * Copyright 2014- Qubole Inc.
 *
 * 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.qubole.qds.sdk.java.entities;

import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.DeserializationContext;
import org.codehaus.jackson.map.JsonDeserializer;
import org.codehaus.jackson.map.ObjectMapper;

import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

/**
 * This class is custom serializer for sub commands, as in same tag we can get
 * an array or a hash, we needed a custom serializer to handle this scenario
 */
public class SubCommandsDeserializer extends JsonDeserializer
{
    public SubCommandsDeserializer()
    {
    }

    @Override
    public SubCommands deserialize(JsonParser jp, DeserializationContext ctxt)
            throws IOException, JsonProcessingException
    {
        ObjectMapper mapper = (ObjectMapper) jp.getCodec();
        JsonNode node = jp.getCodec().readTree(jp);

        SubCommands compositeCommand = new SubCommands();

        // we got the json node for the command tag
        // it can either be a set of name value pairs
        // i.e. Map as it is today
        // or it can have an array with tag sub_commands
        // which will have Command objects for all the sub commands
        Iterator> elementsIterator =
                node.getFields();
        while (elementsIterator.hasNext())
        {
            Map.Entry element = elementsIterator.next();
            String name = element.getKey();
            JsonNode val = element.getValue();
            if (name.equalsIgnoreCase("sub_commands")) {
                Command[] subCommands = mapper.readValue(val, Command[].class);
                if (subCommands != null) {
                    compositeCommand.setsub_commands(subCommands);
                }
            }
            else {
                // put it in hash map as earlier
                compositeCommand.put(name, val.getTextValue());
            }
        }
        return compositeCommand;
    }
}