/**
* Copyright 2013 Cloudera 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.cloudera.cdk.maven.plugins;
import com.cloudera.cdk.data.DatasetDescriptor;
import com.cloudera.cdk.data.DatasetRepository;
import com.cloudera.cdk.data.Formats;
import com.cloudera.cdk.data.impl.Accessor;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.plugins.annotations.ResolutionScope;
/**
* Create a named dataset whose entries conform to a defined schema.
*/
@Mojo(name = "create-dataset", requiresProject = false, requiresDependencyResolution = ResolutionScope.COMPILE)
public class CreateDatasetMojo extends AbstractDatasetMojo {
/**
* The name of the dataset to create.
*/
@Parameter(property = "cdk.datasetName", required = true)
private String datasetName;
/**
* The file containing the Avro schema. If no file with the specified name is found
* on the local filesystem, then the classpath is searched for a matching resource.
* One of either this property or <code>cdk.avroSchemaReflectClass</code> must be
* specified.
*/
@Parameter(property = "cdk.avroSchemaFile")
private String avroSchemaFile;
/**
* The fully-qualified classname of the Avro reflect class to use to generate a
* schema. The class must be available on the classpath.
* One of either this property or <code>cdk.avroSchemaFile</code> must be
* specified.
*/
@Parameter(property = "cdk.avroSchemaReflectClass")
private String avroSchemaReflectClass;
/**
* The file format (avro or parquet).
*/
@Parameter(property = "cdk.format")
private String format = Formats.AVRO.getName();
/**
* The partition expression, in JEXL format (experimental).
*/
@Parameter(property = "cdk.partitionExpression")
private String partitionExpression;
@Override
public void execute() throws MojoExecutionException, MojoFailureException {
if (avroSchemaFile == null && avroSchemaReflectClass == null) {
throw new IllegalArgumentException("One of cdk.avroSchemaFile or " +
"cdk.avroSchemaReflectClass must be specified");
}
DatasetRepository repo = getDatasetRepository();
DatasetDescriptor.Builder descriptorBuilder = new DatasetDescriptor.Builder();
configureSchema(descriptorBuilder, avroSchemaFile, avroSchemaReflectClass);
if (format.equals(Formats.AVRO.getName())) {
descriptorBuilder.format(Formats.AVRO);
} else if (format.equals(Formats.PARQUET.getName())) {
descriptorBuilder.format(Formats.PARQUET);
} else {
throw new MojoExecutionException("Unrecognized format: " + format);
}
if (partitionExpression != null) {
descriptorBuilder.partitionStrategy(Accessor.getDefault().fromExpression(partitionExpression));
}
repo.create(datasetName, descriptorBuilder.build());
}
}