/**
* Copyright 2007 The Apache Software Foundation
*
* 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.hbase.hql;
import java.io.IOException;
import java.io.Writer;
import org.apache.hadoop.hbase.HBaseAdmin;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HTableDescriptor;
/**
* Shows all available tables.
*/
public class ShowCommand extends BasicCommand {
private static final String[] HEADER = new String[] { "Name", "Descriptor" };
private String command;
private final TableFormatter formatter;
// Not instantiable
@SuppressWarnings("unused")
private ShowCommand() {
this(null, null);
}
public ShowCommand(final Writer o, final TableFormatter f) {
this(o, f, null);
}
public ShowCommand(final Writer o, final TableFormatter f,
final String argument) {
super(o);
this.formatter = f;
this.command = argument;
}
public ReturnMsg execute(final HBaseConfiguration conf) {
if (command == null) {
return new ReturnMsg(0, "Syntax error : Please check 'Show' syntax.");
}
try {
HBaseAdmin admin = new HBaseAdmin(conf);
int tableLength = 0;
HTableDescriptor[] tables = admin.listTables();
tableLength = tables.length;
if (tableLength == 0) {
return new ReturnMsg(0, "No tables found.");
}
formatter.header(HEADER);
for (int i = 0; i < tableLength; i++) {
String tableName = tables[i].getName().toString();
formatter.row(new String[] { tableName, tables[i].toString() });
}
formatter.footer();
return new ReturnMsg(1, tableLength + " table(s) in set.");
} catch (IOException e) {
return new ReturnMsg(0, "error msg : " + e.toString());
}
}
public void setArgument(String argument) {
this.command = argument;
}
}