UseNamespaceCommand.java

/*
 * Copyright © 2015 Cask Data, 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 co.cask.cdap.cli.command;

import co.cask.cdap.cli.ArgumentName;
import co.cask.cdap.cli.CLIConfig;
import co.cask.cdap.cli.ElementType;
import co.cask.cdap.cli.util.AbstractAuthCommand;
import co.cask.cdap.client.NamespaceClient;
import co.cask.cdap.proto.Id;
import co.cask.common.cli.Arguments;
import com.google.inject.Inject;

import java.io.PrintStream;

/**
 * Changes the current namespace.
 */
public class UseNamespaceCommand extends AbstractAuthCommand {

  private final CLIConfig cliConfig;
  private final NamespaceClient namespaceClient;


  @Inject
  public UseNamespaceCommand(CLIConfig cliConfig, NamespaceClient namespaceClient) {
    super(cliConfig);
    this.cliConfig = cliConfig;
    this.namespaceClient = namespaceClient;
  }

  @Override
  public void perform(Arguments arguments, PrintStream output) throws Exception {
    Id.Namespace namespace = Id.Namespace.from(arguments.get(ArgumentName.NAMESPACE_NAME.toString()));
    // Check if namespace exists; throws exception if namespace doesn't exist.
    namespaceClient.get(namespace);
    cliConfig.setNamespace(namespace);
    output.printf("Now using namespace '%s'\n", namespace.getId());
  }

  @Override
  public String getPattern() {
    return String.format("use namespace <%s>", ArgumentName.NAMESPACE_NAME);
  }

  @Override
  public String getDescription() {
    return String.format("Changes the current %s to '<%s>'",
                         ElementType.NAMESPACE.getName(),
                         ArgumentName.NAMESPACE_NAME);
  }
}