/*
* 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.cli.commands;
import com.beust.jcommander.Parameter;
import com.beust.jcommander.Parameters;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.collect.Lists;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import org.apache.avro.generic.GenericRecord;
import org.kitesdk.data.Dataset;
import org.kitesdk.data.DatasetDescriptor;
import org.kitesdk.data.spi.ColumnMappingParser;
import org.kitesdk.data.spi.PartitionStrategyParser;
import org.slf4j.Logger;
@Parameters(commandDescription="Print all metadata for a Dataset")
public class InfoCommand extends BaseDatasetCommand {
private static final Splitter NEWLINE = Splitter.on('\n');
private static final Joiner NEWLINE_TAB = Joiner.on("\n\t\t");
@Parameter(description = "<dataset name>")
List<String> datasets;
public InfoCommand(Logger console) {
super(console);
}
@Override
public int run() throws IOException {
Preconditions.checkArgument(
datasets != null && !datasets.isEmpty(),
"Missing dataset name");
for (String name : datasets) {
printInfo(console, load(name, GenericRecord.class).getDataset());
}
return 0;
}
private static void printInfo(Logger console, Dataset<?> dataset) {
DatasetDescriptor desc = dataset.getDescriptor();
String schema = ColumnMappingParser.removeEmbeddedMapping(
PartitionStrategyParser.removeEmbeddedStrategy(desc.getSchema()))
.toString(true);
Collection<String> properties = desc.listProperties();
console.info("\nDataset \"{}\":", dataset.getName());
console.info("\tURI: \"{}\"", dataset.getUri());
console.info("\tSchema: {}", indent(schema));
if (desc.isPartitioned()) {
console.info("\tPartition strategy: {}",
indent(desc.getPartitionStrategy().toString(true)));
} else {
console.info("\tNot partitioned");
}
if (desc.isColumnMapped()) {
console.info("\tColumn mapping: {}",
indent(desc.getColumnMapping().toString(true)));
}
if (!properties.isEmpty()) {
StringBuilder sb = new StringBuilder();
for (String prop : properties) {
sb.append("\n\t\t").append(prop).append("=")
.append(desc.getProperty(prop));
}
console.info("\tProperties:{}", sb.toString());
}
}
private static String indent(String lines) {
return NEWLINE_TAB.join(NEWLINE.split(lines));
}
@Override
public List<String> getExamples() {
return Lists.newArrayList(
"# Print metadata about dataset \"users\":",
"users"
);
}
}