org.kitesdk.maven.plugins.UpdateDatasetMojo.java Source code

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Here is the source code for org.kitesdk.maven.plugins.UpdateDatasetMojo.java

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/**
 * 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 org.kitesdk.maven.plugins;

import com.google.common.io.Resources;

import java.io.File;
import java.io.IOException;

import org.kitesdk.data.DatasetDescriptor;
import org.kitesdk.data.DatasetRepository;
import org.kitesdk.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;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Update a dataset's schema.
 */
@Mojo(name = "update-dataset", requiresProject = false, requiresDependencyResolution = ResolutionScope.COMPILE)
public class UpdateDatasetMojo extends AbstractDatasetMojo {

    private static final Logger LOG = LoggerFactory.getLogger(UpdateDatasetMojo.class);

    /**
     * The name of the dataset to update.
     */
    @Parameter(property = "kite.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>kite.avroSchemaReflectClass</code> must be specified.
     */
    @Parameter(property = "kite.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>kite.avroSchemaFile</code> must be specified.
     */
    @Parameter(property = "kite.avroSchemaReflectClass")
    private String avroSchemaReflectClass;

    @Parameter(property = "kite.columnDescriptorFile")
    private String columnDescriptorFile;

    @Override
    public void execute() throws MojoExecutionException, MojoFailureException {
        if (avroSchemaFile == null && avroSchemaReflectClass == null) {
            throw new IllegalArgumentException(
                    "One of kite.avroSchemaFile or " + "kite.avroSchemaReflectClass must be specified");
        }

        DatasetRepository repo = getDatasetRepository();

        DatasetDescriptor descriptor = repo.load(datasetName).getDescriptor();
        DatasetDescriptor.Builder descriptorBuilder = new DatasetDescriptor.Builder(descriptor);
        configureSchema(descriptorBuilder, avroSchemaFile, avroSchemaReflectClass);

        if (columnDescriptorFile != null) {
            File columnDescriptor = new File(columnDescriptorFile);
            try {
                if (columnDescriptor.exists()) {
                    descriptorBuilder.columnMapping(columnDescriptor);
                } else {
                    descriptorBuilder.columnMapping(Resources.getResource(columnDescriptorFile).openStream());
                }
            } catch (IOException e) {
                throw new MojoExecutionException("Problem while reading file " + columnDescriptorFile, e);
            }
        }

        repo.update(datasetName, descriptorBuilder.build());
    }
}