com.uber.hoodie.utilities.schema.FilebasedSchemaProvider Maven / Gradle / Ivy

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/*
 *  Copyright (c) 2017 Uber Technologies, Inc. ([email protected])
 *
 *  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.uber.hoodie.utilities.schema;

import com.uber.hoodie.common.util.FSUtils;
import com.uber.hoodie.exception.HoodieIOException;
import com.uber.hoodie.utilities.UtilHelpers;

import org.apache.avro.Schema;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

import java.io.IOException;
import java.util.Arrays;

/**
 * A simple schema provider, that reads off files on DFS
 */
public class FilebasedSchemaProvider extends SchemaProvider {

    /**
     * Configs supported
     */
    static class Config {
        private static final String SOURCE_SCHEMA_FILE_PROP = "hoodie.deltastreamer.filebased.schemaprovider.source.schema.file";
        private static final String TARGET_SCHEMA_FILE_PROP = "hoodie.deltastreamer.filebased.schemaprovider.target.schema.file";
    }

    private final FileSystem fs;

    private final Schema sourceSchema;

    private final Schema targetSchema;

    public FilebasedSchemaProvider(PropertiesConfiguration config) {
        super(config);
        this.fs = FSUtils.getFs();

        UtilHelpers.checkRequiredProperties(config, Arrays.asList(Config.SOURCE_SCHEMA_FILE_PROP, Config.TARGET_SCHEMA_FILE_PROP));
        try {
            this.sourceSchema = new Schema.Parser().parse(fs.open(new Path(config.getString(Config.SOURCE_SCHEMA_FILE_PROP))));
            this.targetSchema = new Schema.Parser().parse(fs.open(new Path(config.getString(Config.TARGET_SCHEMA_FILE_PROP))));
        } catch (IOException ioe) {
            throw new HoodieIOException("Error reading schema", ioe);
        }
    }

    @Override
    public Schema getSourceSchema() {
        return sourceSchema;
    }

    @Override
    public Schema getTargetSchema() {
        return targetSchema;
    }
}