com.cloudera.exhibit.server.json.FrameSerializer.java Source code

Introduction

Here is the source code for com.cloudera.exhibit.server.json.FrameSerializer.java

Source

/**
 * 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 com.cloudera.exhibit.server.json;

import com.cloudera.exhibit.core.Frame;
import com.cloudera.exhibit.core.Obs;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;

public class FrameSerializer extends JsonSerializer<Frame> {
    @Override
    public void serialize(Frame res, JsonGenerator gen, SerializerProvider provider) throws IOException {
        gen.writeStartObject();
        gen.writeArrayFieldStart("columns");
        for (int i = 0; i < res.descriptor().size(); i++) {
            gen.writeString(res.descriptor().get(i).name);
        }
        gen.writeEndArray();

        gen.writeArrayFieldStart("data");
        for (Obs obs : res) {
            gen.writeStartArray();
            for (int i = 0; i < res.descriptor().size(); i++) {
                gen.writeObject(obs.get(i));
            }
            gen.writeEndArray();
        }
        gen.writeEndArray();
        gen.writeEndObject();
    }
}