org.apache.hadoop.hive.ql.ddl.misc.conf.ShowConfOperation Maven / Gradle / Ivy
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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.hadoop.hive.ql.ddl.misc.conf;
import org.apache.hadoop.hive.ql.ddl.DDLOperationContext;
import org.apache.hadoop.hive.ql.ddl.ShowUtils;
import org.apache.hadoop.hive.ql.exec.Utilities;
import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
import org.apache.hadoop.hive.ql.ddl.DDLOperation;
import org.apache.hadoop.hive.ql.metadata.HiveException;
/**
* Operation process of showing some configuration.
*/
public class ShowConfOperation extends DDLOperation {
public ShowConfOperation(DDLOperationContext context, ShowConfDesc desc) {
super(context, desc);
}
@Override
public int execute() throws HiveException, IOException {
ConfVars conf = HiveConf.getConfVars(desc.getConfName());
if (conf == null) {
throw new HiveException("invalid configuration name " + desc.getConfName());
}
String description = conf.getDescription();
String defaultValue = conf.getDefaultValue();
try (DataOutputStream output = ShowUtils.getOutputStream(desc.getResFile(), context)) {
if (defaultValue != null) {
output.write(defaultValue.getBytes(StandardCharsets.UTF_8));
}
output.write(Utilities.tabCode);
output.write(conf.typeString().getBytes(StandardCharsets.UTF_8));
output.write(Utilities.tabCode);
if (description != null) {
output.write(description.replaceAll(" *\n *", " ").getBytes(StandardCharsets.UTF_8));
}
output.write(Utilities.newLineCode);
}
return 0;
}
}