org.apache.drill.exec.store.easy.json.JSONFormatPlugin.java Source code

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Here is the source code for org.apache.drill.exec.store.easy.json.JSONFormatPlugin.java

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/**
 * 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 org.apache.drill.exec.store.easy.json;

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

import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.common.logical.FormatPluginConfig;
import org.apache.drill.common.logical.StoragePluginConfig;
import org.apache.drill.exec.ExecConstants;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.proto.ExecProtos.FragmentHandle;
import org.apache.drill.exec.proto.UserBitShared.CoreOperatorType;
import org.apache.drill.exec.server.DrillbitContext;
import org.apache.drill.exec.store.RecordReader;
import org.apache.drill.exec.store.RecordWriter;
import org.apache.drill.exec.store.dfs.DrillFileSystem;
import org.apache.drill.exec.store.dfs.FileSystemConfig;
import org.apache.drill.exec.store.dfs.easy.EasyFormatPlugin;
import org.apache.drill.exec.store.dfs.easy.EasyWriter;
import org.apache.drill.exec.store.dfs.easy.FileWork;
import org.apache.drill.exec.store.easy.json.JSONFormatPlugin.JSONFormatConfig;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonTypeName;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;

public class JSONFormatPlugin extends EasyFormatPlugin<JSONFormatConfig> {

    private static final boolean IS_COMPRESSIBLE = true;
    private static final String DEFAULT_NAME = "json";

    public JSONFormatPlugin(String name, DrillbitContext context, Configuration fsConf,
            StoragePluginConfig storageConfig) {
        this(name, context, fsConf, storageConfig, new JSONFormatConfig());
    }

    public JSONFormatPlugin(String name, DrillbitContext context, Configuration fsConf, StoragePluginConfig config,
            JSONFormatConfig formatPluginConfig) {
        super(name, context, fsConf, config, formatPluginConfig, true, false, false, IS_COMPRESSIBLE,
                formatPluginConfig.getExtensions(), DEFAULT_NAME);
    }

    @Override
    public RecordReader getRecordReader(FragmentContext context, DrillFileSystem dfs, FileWork fileWork,
            List<SchemaPath> columns, String userName) throws ExecutionSetupException {
        return new JSONRecordReader(context, fileWork.getPath(), dfs, columns);
    }

    @Override
    public RecordWriter getRecordWriter(FragmentContext context, EasyWriter writer) throws IOException {
        Map<String, String> options = Maps.newHashMap();

        options.put("location", writer.getLocation());

        FragmentHandle handle = context.getHandle();
        String fragmentId = String.format("%d_%d", handle.getMajorFragmentId(), handle.getMinorFragmentId());
        options.put("prefix", fragmentId);

        options.put("separator", " ");
        options.put(FileSystem.FS_DEFAULT_NAME_KEY, ((FileSystemConfig) writer.getStorageConfig()).connection);

        options.put("extension", "json");
        options.put("extended",
                Boolean.toString(context.getOptions().getOption(ExecConstants.JSON_EXTENDED_TYPES)));
        options.put("uglify", Boolean.toString(context.getOptions().getOption(ExecConstants.JSON_WRITER_UGLIFY)));
        options.put("skipnulls",
                Boolean.toString(context.getOptions().getOption(ExecConstants.JSON_WRITER_SKIPNULLFIELDS)));

        RecordWriter recordWriter = new JsonRecordWriter();
        recordWriter.init(options);

        return recordWriter;
    }

    @JsonTypeName("json")
    public static class JSONFormatConfig implements FormatPluginConfig {

        public List<String> extensions = ImmutableList.of("json");
        private static final List<String> DEFAULT_EXTS = ImmutableList.of("json");

        @JsonInclude(JsonInclude.Include.NON_DEFAULT)
        public List<String> getExtensions() {
            if (extensions == null) {
                // when loading an old JSONFormatConfig that doesn't contain an "extensions" attribute
                return DEFAULT_EXTS;
            }
            return extensions;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((extensions == null) ? 0 : extensions.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj == null) {
                return false;
            }
            if (getClass() != obj.getClass()) {
                return false;
            }
            JSONFormatConfig other = (JSONFormatConfig) obj;
            if (extensions == null) {
                if (other.extensions != null) {
                    return false;
                }
            } else if (!extensions.equals(other.extensions)) {
                return false;
            }
            return true;
        }

    }

    @Override
    public int getReaderOperatorType() {
        return CoreOperatorType.JSON_SUB_SCAN_VALUE;
    }

    @Override
    public int getWriterOperatorType() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean supportsPushDown() {
        return true;
    }

}