com.streamsets.datacollector.record.FieldDeserializer.java Source code

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Here is the source code for com.streamsets.datacollector.record.FieldDeserializer.java

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/**
 * Copyright 2015 StreamSets Inc.
 *
 * Licensed under 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 com.streamsets.datacollector.record;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.streamsets.datacollector.restapi.bean.FieldJson;
import com.streamsets.datacollector.util.EscapeUtil;
import com.streamsets.pipeline.api.Field;

import org.apache.commons.codec.binary.Base64;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

public class FieldDeserializer extends JsonDeserializer<FieldJson> {

    @Override
    @SuppressWarnings("unchecked")
    public FieldJson deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
        Field field = parse(jp.readValueAs(Map.class));
        return new FieldJson(field);
    }

    @SuppressWarnings("unchecked")
    private Field parse(Map<String, Object> map) {
        Field field = null;
        if (map != null) {
            Field.Type type = Field.Type.valueOf((String) map.get("type"));
            Object value = map.get("value");
            if (value != null) {
                switch (type) {
                case MAP:
                    Map<String, Field> fMap = new HashMap<>();
                    for (Map.Entry<String, Object> entry : ((Map<String, Object>) value).entrySet()) {
                        fMap.put(entry.getKey(), parse((Map<String, Object>) entry.getValue()));
                    }
                    value = fMap;
                    break;
                case LIST:
                    List<Field> fList = new ArrayList<>();
                    for (Map<String, Object> element : (List<Map<String, Object>>) value) {
                        fList.add(parse(element));
                    }
                    value = fList;
                    break;
                case LIST_MAP:
                    //When converting list to listMap, Key for the listMap is recovered using path attribute
                    Map<String, Field> listMap = new LinkedHashMap<>();
                    for (Map<String, Object> element : (List<Map<String, Object>>) value) {
                        String path = (String) element.get("sqpath");
                        listMap.put(EscapeUtil.getLastFieldNameFromPath(path), parse(element));
                    }
                    value = listMap;
                    break;
                case BYTE_ARRAY:
                    value = Base64.decodeBase64((String) value);
                    break;
                case INTEGER:
                    value = Integer.parseInt((String) value);
                    break;
                case LONG:
                    value = Long.parseLong((String) value);
                    break;
                case FLOAT:
                    value = Float.parseFloat((String) value);
                    break;
                case DOUBLE:
                    value = Double.parseDouble((String) value);
                    break;
                default:
                    break;
                }
            }
            field = Field.create(type, value);
        }
        return field;
    }

}